Assignment1: done Ex1 1-6
This commit is contained in:
Claudio Maggioni
commit
a483b4b08b
31 changed files with 1709 additions and 0 deletions
344
hw1/.gitignore
vendored
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344
hw1/.gitignore
vendored
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|
|
@ -0,0 +1,344 @@
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|||
*.pdf
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||||
|
||||
## Core latex/pdflatex auxiliary files:
|
||||
*.aux
|
||||
*.lof
|
||||
*.log
|
||||
*.lot
|
||||
*.fls
|
||||
*.out
|
||||
*.toc
|
||||
*.fmt
|
||||
*.fot
|
||||
*.cb
|
||||
*.cb2
|
||||
.*.lb
|
||||
|
||||
## Intermediate documents:
|
||||
*.dvi
|
||||
*.xdv
|
||||
*-converted-to.*
|
||||
# these rules might exclude image files for figures etc.
|
||||
# *.ps
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||||
# *.eps
|
||||
# *.pdf
|
||||
|
||||
## Generated if empty string is given at "Please type another file name for output:"
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||||
.pdf
|
||||
|
||||
## Bibliography auxiliary files (bibtex/biblatex/biber):
|
||||
*.bbl
|
||||
*.bcf
|
||||
*.blg
|
||||
*-blx.aux
|
||||
*-blx.bib
|
||||
*.run.xml
|
||||
|
||||
## Build tool auxiliary files:
|
||||
*.fdb_latexmk
|
||||
*.synctex
|
||||
*.synctex(busy)
|
||||
*.synctex.gz
|
||||
*.synctex.gz(busy)
|
||||
*.pdfsync
|
||||
|
||||
## Build tool directories for auxiliary files
|
||||
# latexrun
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||||
latex.out/
|
||||
|
||||
## Auxiliary and intermediate files from other packages:
|
||||
# algorithms
|
||||
*.alg
|
||||
*.loa
|
||||
|
||||
# achemso
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||||
acs-*.bib
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||||
|
||||
# amsthm
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||||
*.thm
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||||
|
||||
# beamer
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||||
*.nav
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||||
*.pre
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||||
*.snm
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||||
*.vrb
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||||
|
||||
# changes
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||||
*.soc
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||||
|
||||
# comment
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||||
*.cut
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||||
|
||||
# cprotect
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||||
*.cpt
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||||
|
||||
# elsarticle (documentclass of Elsevier journals)
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||||
*.spl
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||||
|
||||
# endnotes
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||||
*.ent
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||||
|
||||
# fixme
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||||
*.lox
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||||
|
||||
# feynmf/feynmp
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||||
*.mf
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||||
*.mp
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||||
*.t[1-9]
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||||
*.t[1-9][0-9]
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||||
*.tfm
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||||
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||||
#(r)(e)ledmac/(r)(e)ledpar
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*.end
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||||
*.?end
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||||
*.[1-9]
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||||
*.[1-9][0-9]
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||||
*.[1-9][0-9][0-9]
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||||
*.[1-9]R
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||||
*.[1-9][0-9]R
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||||
*.[1-9][0-9][0-9]R
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||||
*.eledsec[1-9]
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||||
*.eledsec[1-9]R
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||||
*.eledsec[1-9][0-9]
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||||
*.eledsec[1-9][0-9]R
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||||
*.eledsec[1-9][0-9][0-9]
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*.eledsec[1-9][0-9][0-9]R
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||||
# glossaries
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||||
*.acn
|
||||
*.acr
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||||
*.glg
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||||
*.glo
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*.gls
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||||
*.glsdefs
|
||||
*.lzo
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||||
*.lzs
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||||
|
||||
# uncomment this for glossaries-extra (will ignore makeindex's style files!)
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# *.ist
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||||
|
||||
# gnuplottex
|
||||
*-gnuplottex-*
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||||
|
||||
# gregoriotex
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||||
*.gaux
|
||||
*.gtex
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||||
|
||||
# htlatex
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||||
*.4ct
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||||
*.4tc
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||||
*.idv
|
||||
*.lg
|
||||
*.trc
|
||||
*.xref
|
||||
|
||||
# hyperref
|
||||
*.brf
|
||||
|
||||
# knitr
|
||||
*-concordance.tex
|
||||
# TODO Comment the next line if you want to keep your tikz graphics files
|
||||
*.tikz
|
||||
*-tikzDictionary
|
||||
|
||||
# listings
|
||||
*.lol
|
||||
|
||||
# luatexja-ruby
|
||||
*.ltjruby
|
||||
|
||||
# makeidx
|
||||
*.idx
|
||||
*.ilg
|
||||
*.ind
|
||||
|
||||
# minitoc
|
||||
*.maf
|
||||
*.mlf
|
||||
*.mlt
|
||||
*.mtc[0-9]*
|
||||
*.slf[0-9]*
|
||||
*.slt[0-9]*
|
||||
*.stc[0-9]*
|
||||
|
||||
# minted
|
||||
_minted*
|
||||
*.pyg
|
||||
|
||||
# morewrites
|
||||
*.mw
|
||||
|
||||
# nomencl
|
||||
*.nlg
|
||||
*.nlo
|
||||
*.nls
|
||||
|
||||
# pax
|
||||
*.pax
|
||||
|
||||
# pdfpcnotes
|
||||
*.pdfpc
|
||||
|
||||
# sagetex
|
||||
*.sagetex.sage
|
||||
*.sagetex.py
|
||||
*.sagetex.scmd
|
||||
|
||||
# scrwfile
|
||||
*.wrt
|
||||
|
||||
# sympy
|
||||
*.sout
|
||||
*.sympy
|
||||
sympy-plots-for-*.tex/
|
||||
|
||||
# pdfcomment
|
||||
*.upa
|
||||
*.upb
|
||||
|
||||
# pythontex
|
||||
*.pytxcode
|
||||
pythontex-files-*/
|
||||
|
||||
# tcolorbox
|
||||
*.listing
|
||||
|
||||
# thmtools
|
||||
*.loe
|
||||
|
||||
# TikZ & PGF
|
||||
*.dpth
|
||||
*.md5
|
||||
*.auxlock
|
||||
|
||||
# todonotes
|
||||
*.tdo
|
||||
|
||||
# vhistory
|
||||
*.hst
|
||||
*.ver
|
||||
|
||||
# easy-todo
|
||||
*.lod
|
||||
|
||||
# xcolor
|
||||
*.xcp
|
||||
|
||||
# xmpincl
|
||||
*.xmpi
|
||||
|
||||
# xindy
|
||||
*.xdy
|
||||
|
||||
# xypic precompiled matrices and outlines
|
||||
*.xyc
|
||||
*.xyd
|
||||
|
||||
# endfloat
|
||||
*.ttt
|
||||
*.fff
|
||||
|
||||
# Latexian
|
||||
TSWLatexianTemp*
|
||||
|
||||
## Editors:
|
||||
# WinEdt
|
||||
*.bak
|
||||
*.sav
|
||||
|
||||
# Texpad
|
||||
.texpadtmp
|
||||
|
||||
# LyX
|
||||
*.lyx~
|
||||
|
||||
# Kile
|
||||
*.backup
|
||||
|
||||
# gummi
|
||||
.*.swp
|
||||
|
||||
# KBibTeX
|
||||
*~[0-9]*
|
||||
|
||||
# auto folder when using emacs and auctex
|
||||
./auto/*
|
||||
*.el
|
||||
|
||||
# expex forward references with \gathertags
|
||||
*-tags.tex
|
||||
|
||||
# standalone packages
|
||||
*.sta
|
||||
|
||||
# Makeindex log files
|
||||
*.lpz
|
||||
|
||||
# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
|
||||
# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
|
||||
|
||||
# User-specific stuff
|
||||
.idea/**/workspace.xml
|
||||
.idea/**/tasks.xml
|
||||
.idea/**/usage.statistics.xml
|
||||
.idea/**/dictionaries
|
||||
.idea/**/shelf
|
||||
|
||||
# Generated files
|
||||
.idea/**/contentModel.xml
|
||||
|
||||
# Sensitive or high-churn files
|
||||
.idea/**/dataSources/
|
||||
.idea/**/dataSources.ids
|
||||
.idea/**/dataSources.local.xml
|
||||
.idea/**/sqlDataSources.xml
|
||||
.idea/**/dynamic.xml
|
||||
.idea/**/uiDesigner.xml
|
||||
.idea/**/dbnavigator.xml
|
||||
|
||||
# Gradle
|
||||
.idea/**/gradle.xml
|
||||
.idea/**/libraries
|
||||
|
||||
# Gradle and Maven with auto-import
|
||||
# When using Gradle or Maven with auto-import, you should exclude module files,
|
||||
# since they will be recreated, and may cause churn. Uncomment if using
|
||||
# auto-import.
|
||||
# .idea/modules.xml
|
||||
# .idea/*.iml
|
||||
# .idea/modules
|
||||
# *.iml
|
||||
# *.ipr
|
||||
|
||||
# CMake
|
||||
cmake-build-*/
|
||||
|
||||
# Mongo Explorer plugin
|
||||
.idea/**/mongoSettings.xml
|
||||
|
||||
# File-based project format
|
||||
*.iws
|
||||
|
||||
# IntelliJ
|
||||
out/
|
||||
|
||||
# mpeltonen/sbt-idea plugin
|
||||
.idea_modules/
|
||||
|
||||
# JIRA plugin
|
||||
atlassian-ide-plugin.xml
|
||||
|
||||
# Cursive Clojure plugin
|
||||
.idea/replstate.xml
|
||||
|
||||
# Crashlytics plugin (for Android Studio and IntelliJ)
|
||||
com_crashlytics_export_strings.xml
|
||||
crashlytics.properties
|
||||
crashlytics-build.properties
|
||||
fabric.properties
|
||||
|
||||
# Editor-based Rest Client
|
||||
.idea/httpRequests
|
||||
|
||||
# Android studio 3.1+ serialized cache file
|
||||
.idea/caches/build_file_checksums.ser
|
||||
12
hw1/Ex1/.idea/Ex1.iml
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12
hw1/Ex1/.idea/Ex1.iml
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@ -0,0 +1,12 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<module type="JAVA_MODULE" version="4">
|
||||
<component name="NewModuleRootManager" inherit-compiler-output="true">
|
||||
<exclude-output />
|
||||
<content url="file://$MODULE_DIR$">
|
||||
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
|
||||
<excludeFolder url="file://$MODULE_DIR$/out" />
|
||||
</content>
|
||||
<orderEntry type="inheritedJdk" />
|
||||
<orderEntry type="sourceFolder" forTests="false" />
|
||||
</component>
|
||||
</module>
|
||||
11
hw1/Ex1/.idea/inspectionProfiles/Project_Default.xml
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11
hw1/Ex1/.idea/inspectionProfiles/Project_Default.xml
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|
|||
<component name="InspectionProjectProfileManager">
|
||||
<profile version="1.0">
|
||||
<option name="myName" value="Project Default" />
|
||||
<inspection_tool class="Duplicates" enabled="true" level="WEAK WARNING" enabled_by_default="true">
|
||||
<Java>
|
||||
<minSize>83</minSize>
|
||||
<isEnabled>true</isEnabled>
|
||||
</Java>
|
||||
</inspection_tool>
|
||||
</profile>
|
||||
</component>
|
||||
9
hw1/Ex1/.idea/misc.xml
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9
hw1/Ex1/.idea/misc.xml
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|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project version="4">
|
||||
<component name="JavaScriptSettings">
|
||||
<option name="languageLevel" value="ES6" />
|
||||
</component>
|
||||
<component name="ProjectRootManager" version="2" languageLevel="JDK_12" default="false" project-jdk-name="12.0.1" project-jdk-type="JavaSDK">
|
||||
<output url="file://$PROJECT_DIR$/out" />
|
||||
</component>
|
||||
</project>
|
||||
8
hw1/Ex1/.idea/modules.xml
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8
hw1/Ex1/.idea/modules.xml
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|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project version="4">
|
||||
<component name="ProjectModuleManager">
|
||||
<modules>
|
||||
<module fileurl="file://$PROJECT_DIR$/.idea/Ex1.iml" filepath="$PROJECT_DIR$/.idea/Ex1.iml" />
|
||||
</modules>
|
||||
</component>
|
||||
</project>
|
||||
6
hw1/Ex1/.idea/vcs.xml
Normal file
6
hw1/Ex1/.idea/vcs.xml
Normal file
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|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project version="4">
|
||||
<component name="VcsDirectoryMappings">
|
||||
<mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
|
||||
</component>
|
||||
</project>
|
||||
464
hw1/Ex1/.idea/workspace.xml
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464
hw1/Ex1/.idea/workspace.xml
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|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project version="4">
|
||||
<component name="ChangeListManager">
|
||||
<list default="true" id="d712734b-6034-468c-b553-7e4d8f6128c3" name="Default Changelist" comment="">
|
||||
<change afterPath="$PROJECT_DIR$/.idea/Ex1.iml" afterDir="false" />
|
||||
<change afterPath="$PROJECT_DIR$/.idea/inspectionProfiles/Project_Default.xml" afterDir="false" />
|
||||
<change afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
|
||||
<change afterPath="$PROJECT_DIR$/.idea/modules.xml" afterDir="false" />
|
||||
<change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
|
||||
</list>
|
||||
<option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
|
||||
<option name="SHOW_DIALOG" value="false" />
|
||||
<option name="HIGHLIGHT_CONFLICTS" value="true" />
|
||||
<option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
|
||||
<option name="LAST_RESOLUTION" value="IGNORE" />
|
||||
</component>
|
||||
<component name="DefaultGradleProjectSettings">
|
||||
<option name="testRunner" value="GRADLE" />
|
||||
<option name="delegatedBuild" value="true" />
|
||||
</component>
|
||||
<component name="FileEditorManager">
|
||||
<leaf>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/sequential/SequentialSum.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="180">
|
||||
<caret line="12" column="30" selection-start-line="12" selection-start-column="30" selection-end-line="12" selection-end-column="30" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/synchronized1/MultipleUpdatesPerThreadSynch.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="317">
|
||||
<caret line="28" column="9" selection-start-line="19" selection-start-column="8" selection-end-line="28" selection-end-column="9" />
|
||||
<folding>
|
||||
<element signature="e#301#302#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/simple1/MultipleUpdatesPerThread.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="75">
|
||||
<caret line="13" column="18" selection-start-line="13" selection-start-column="18" selection-end-line="13" selection-end-column="18" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="true">
|
||||
<entry file="file://$PROJECT_DIR$/src/atomic1/MultipleUpdatesPerThreadAtomic.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="450">
|
||||
<caret line="31" lean-forward="true" selection-start-line="31" selection-end-line="31" />
|
||||
<folding>
|
||||
<element signature="e#312#313#0" expanded="true" />
|
||||
<element signature="e#344#345#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/test/Test.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="175">
|
||||
<caret line="61" column="8" lean-forward="true" selection-start-line="61" selection-start-column="8" selection-end-line="61" selection-end-column="8" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/parallel/CollectingResults.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="30">
|
||||
<caret line="2" column="17" lean-forward="true" selection-start-line="2" selection-start-column="17" selection-end-line="2" selection-end-column="17" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/simple2/SingleUpdatePerThread.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="285">
|
||||
<caret line="21" column="24" selection-start-line="21" selection-start-column="24" selection-end-line="21" selection-end-column="24" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/synchronized2/SingleUpdatePerThreadSynch.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="180">
|
||||
<caret line="12" column="31" selection-start-line="12" selection-start-column="31" selection-end-line="12" selection-end-column="31" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</file>
|
||||
<file pinned="false" current-in-tab="false">
|
||||
<entry file="file://$PROJECT_DIR$/src/atomic2/SingleUpdatePerThreadAtomic.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="175">
|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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<updated>1570613444806</updated>
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||||
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||||
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||||
<servers />
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||||
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||||
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<component name="TypeScriptGeneratedFilesManager">
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<component name="editorHistoryManager">
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<entry file="file://$PROJECT_DIR$/src/synchronized2/SingleUpdatePerThreadSynch.java">
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||||
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</entry>
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<entry file="file://$PROJECT_DIR$/src/synchronized1/MultipleUpdatesPerThreadSynch.java">
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||||
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||||
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||||
<entry file="file://$PROJECT_DIR$/src/parallel/CollectingResults.java">
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||||
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||||
<state relative-caret-position="30">
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||||
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||||
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||||
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||||
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||||
<entry file="file://$PROJECT_DIR$/src/test/Test.java">
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||||
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||||
<state relative-caret-position="175">
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||||
<caret line="61" column="8" lean-forward="true" selection-start-line="61" selection-start-column="8" selection-end-line="61" selection-end-column="8" />
|
||||
</state>
|
||||
</provider>
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||||
</entry>
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||||
<entry file="file://$PROJECT_DIR$/src/atomic1/MultipleUpdatesPerThreadAtomic.java">
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||||
<provider selected="true" editor-type-id="text-editor">
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||||
<state relative-caret-position="450">
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||||
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||||
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<component name="masterDetails">
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<state key="ArtifactsStructureConfigurable.UI">
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||||
<settings>
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||||
<artifact-editor />
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<splitter-proportions>
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<list>
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||||
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||||
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||||
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||||
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||||
<state key="FacetStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>No facets are configured</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
<state key="GlobalLibrariesConfigurable.UI">
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||||
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||||
<splitter-proportions>
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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<list>
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<option value="0.2" />
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||||
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||||
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||||
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|
||||
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|
||||
<state key="ModuleStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>Ex1</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
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||||
</list>
|
||||
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||||
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<state key="ProjectLibrariesConfigurable.UI">
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||||
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|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
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|
||||
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|
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|
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</states>
|
||||
</component>
|
||||
</project>
|
||||
50
hw1/Ex1/src/atomic1/MultipleUpdatesPerThreadAtomic.java
Normal file
50
hw1/Ex1/src/atomic1/MultipleUpdatesPerThreadAtomic.java
Normal file
|
|
@ -0,0 +1,50 @@
|
|||
package atomic1;
|
||||
|
||||
import java.util.concurrent.atomic.AtomicLong;
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class MultipleUpdatesPerThreadAtomic {
|
||||
private static AtomicLong result;
|
||||
|
||||
private MultipleUpdatesPerThreadAtomic() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static void addPartialResult(long partial) {
|
||||
result.getAndAdd(partial);
|
||||
}
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
result = new AtomicLong(0);
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumMultipleUpdates(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result.longValue();
|
||||
}
|
||||
|
||||
static class SumMultipleUpdates implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumMultipleUpdates(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
for (int i = low; i < high; i++) {
|
||||
MultipleUpdatesPerThreadAtomic.addPartialResult(nums[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
52
hw1/Ex1/src/atomic2/SingleUpdatePerThreadAtomic.java
Normal file
52
hw1/Ex1/src/atomic2/SingleUpdatePerThreadAtomic.java
Normal file
|
|
@ -0,0 +1,52 @@
|
|||
package atomic2;
|
||||
|
||||
import java.util.concurrent.atomic.AtomicLong;
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class SingleUpdatePerThreadAtomic {
|
||||
private static AtomicLong result;
|
||||
|
||||
private SingleUpdatePerThreadAtomic() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static void addPartialResult(long partial) {
|
||||
result.getAndAdd(partial);
|
||||
}
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
result = new AtomicLong(0);
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumSingleUpdate(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result.longValue();
|
||||
}
|
||||
|
||||
static class SumSingleUpdate implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumSingleUpdate(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
long partialSum = 0;
|
||||
for (int i = low; i < high; i++) {
|
||||
partialSum += nums[i];
|
||||
}
|
||||
SingleUpdatePerThreadAtomic.addPartialResult(partialSum);
|
||||
}
|
||||
}
|
||||
}
|
||||
48
hw1/Ex1/src/parallel/CollectingResults.java
Normal file
48
hw1/Ex1/src/parallel/CollectingResults.java
Normal file
|
|
@ -0,0 +1,48 @@
|
|||
package parallel;
|
||||
|
||||
import test.Test;
|
||||
|
||||
// @ThreadSafe
|
||||
public class CollectingResults {
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
long total = 0;
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
SumCollected[] collected = new SumCollected[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
collected[i] = new SumCollected(nums, i * size, (i + 1) * size);
|
||||
threads[i] = new Thread(collected[i]);
|
||||
threads[i].start();
|
||||
}
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i].join();
|
||||
total += collected[i].getPartialSum();
|
||||
}
|
||||
return total;
|
||||
}
|
||||
|
||||
static class SumCollected implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
private long partialSum;
|
||||
|
||||
public SumCollected(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
this.partialSum = 0;
|
||||
}
|
||||
|
||||
public long getPartialSum() {
|
||||
return partialSum;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
for(int i = low; i < high; i++) {
|
||||
partialSum += nums[i];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
17
hw1/Ex1/src/sequential/SequentialSum.java
Normal file
17
hw1/Ex1/src/sequential/SequentialSum.java
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
package sequential;
|
||||
|
||||
// @ThreadSafe
|
||||
public class SequentialSum {
|
||||
|
||||
private SequentialSum() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
public static long sum(int nums[]) {
|
||||
long result = 0;
|
||||
for (int i = 0; i < nums.length; i++) {
|
||||
result += nums[i];
|
||||
}
|
||||
return result;
|
||||
}
|
||||
}
|
||||
50
hw1/Ex1/src/simple1/MultipleUpdatesPerThread.java
Normal file
50
hw1/Ex1/src/simple1/MultipleUpdatesPerThread.java
Normal file
|
|
@ -0,0 +1,50 @@
|
|||
package simple1;
|
||||
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class MultipleUpdatesPerThread {
|
||||
|
||||
private static long result;
|
||||
|
||||
private MultipleUpdatesPerThread() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static void addPartialResult(long partial) {
|
||||
result += partial;
|
||||
}
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
result = 0;
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumMultipleUpdates(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
static class SumMultipleUpdates implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumMultipleUpdates(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
for (int i = low; i < high; i++) {
|
||||
MultipleUpdatesPerThread.addPartialResult(nums[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
51
hw1/Ex1/src/simple2/SingleUpdatePerThread.java
Normal file
51
hw1/Ex1/src/simple2/SingleUpdatePerThread.java
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
package simple2;
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class SingleUpdatePerThread {
|
||||
|
||||
private static long result;
|
||||
|
||||
private SingleUpdatePerThread() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static void addPartialResult(long partial) {
|
||||
result += partial;
|
||||
}
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
result = 0;
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumSingleUpdate(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
static class SumSingleUpdate implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumSingleUpdate(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
long partialSum = 0;
|
||||
for (int i = low; i < high; i++) {
|
||||
partialSum += nums[i];
|
||||
}
|
||||
SingleUpdatePerThread.addPartialResult(partialSum);
|
||||
}
|
||||
}
|
||||
}
|
||||
50
hw1/Ex1/src/synchronized1/MultipleUpdatesPerThreadSynch.java
Normal file
50
hw1/Ex1/src/synchronized1/MultipleUpdatesPerThreadSynch.java
Normal file
|
|
@ -0,0 +1,50 @@
|
|||
package synchronized1;
|
||||
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class MultipleUpdatesPerThreadSynch {
|
||||
|
||||
private static long result;
|
||||
|
||||
private MultipleUpdatesPerThreadSynch() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static synchronized void addPartialResult(long partial) {
|
||||
result += partial;
|
||||
}
|
||||
|
||||
public static long sum(final int[] nums) throws Exception {
|
||||
result = 0;
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumMultipleUpdates(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
static class SumMultipleUpdates implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumMultipleUpdates(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
for (int i = low; i < high; i++) {
|
||||
MultipleUpdatesPerThreadSynch.addPartialResult(nums[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
51
hw1/Ex1/src/synchronized2/SingleUpdatePerThreadSynch.java
Normal file
51
hw1/Ex1/src/synchronized2/SingleUpdatePerThreadSynch.java
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
package synchronized2;
|
||||
import test.Test;
|
||||
|
||||
// @NotThreadSafe
|
||||
public class SingleUpdatePerThreadSynch {
|
||||
|
||||
private static long result;
|
||||
|
||||
private SingleUpdatePerThreadSynch() {
|
||||
// Cannot be instantiated
|
||||
}
|
||||
|
||||
private static synchronized void addPartialResult(long partial) {
|
||||
result += partial;
|
||||
}
|
||||
|
||||
public static long sum(int[] nums) throws Exception {
|
||||
result = 0;
|
||||
Thread[] threads = new Thread[Test.NUM_THREADS];
|
||||
int size = (int) Math.ceil((double) nums.length / Test.NUM_THREADS);
|
||||
for (int i = 0; i < Test.NUM_THREADS; i++) {
|
||||
threads[i] = new Thread(
|
||||
new SumSingleUpdated(nums, i * size, (i + 1) * size));
|
||||
threads[i].start();
|
||||
}
|
||||
for (Thread thread : threads) {
|
||||
thread.join();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
static class SumSingleUpdated implements Runnable {
|
||||
private final int[] nums;
|
||||
private final int low;
|
||||
private final int high;
|
||||
|
||||
public SumSingleUpdated(int[] nums, int low, int high) {
|
||||
this.nums = nums;
|
||||
this.low = low;
|
||||
this.high = Math.min(high, nums.length);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
long partialSum = 0;
|
||||
for (int i = low; i < high; i++) {
|
||||
partialSum += nums[i];
|
||||
}
|
||||
SingleUpdatePerThreadSynch.addPartialResult(partialSum);
|
||||
}
|
||||
}
|
||||
}
|
||||
6
hw1/Ex1/src/test/SumFunction.java
Normal file
6
hw1/Ex1/src/test/SumFunction.java
Normal file
|
|
@ -0,0 +1,6 @@
|
|||
package test;
|
||||
|
||||
@FunctionalInterface
|
||||
public interface SumFunction {
|
||||
long sum(int[] nums) throws Exception;
|
||||
}
|
||||
84
hw1/Ex1/src/test/Test.java
Normal file
84
hw1/Ex1/src/test/Test.java
Normal file
|
|
@ -0,0 +1,84 @@
|
|||
package test;
|
||||
|
||||
import java.util.Random;
|
||||
import sequential.SequentialSum;
|
||||
import parallel.CollectingResults;
|
||||
import simple2.SingleUpdatePerThread;
|
||||
import simple1.MultipleUpdatesPerThread;
|
||||
import atomic2.SingleUpdatePerThreadAtomic;
|
||||
import atomic1.MultipleUpdatesPerThreadAtomic;
|
||||
import synchronized2.SingleUpdatePerThreadSynch;
|
||||
import synchronized1.MultipleUpdatesPerThreadSynch;
|
||||
|
||||
public class Test {
|
||||
|
||||
private static final Random generator = new Random();
|
||||
public static final int NUM_THREADS = 256;
|
||||
private static final int SIZE = 99999999;
|
||||
private static final int RUNS = 15;
|
||||
|
||||
private static long getSum(int[] array) {
|
||||
return SequentialSum.sum(array);
|
||||
}
|
||||
|
||||
private static void testSumImplementation(
|
||||
SumFunction implementation,
|
||||
int[] array, String name) throws Exception {
|
||||
|
||||
// Cloning the array with the random numbers
|
||||
int[] copy = array.clone();
|
||||
// Getting a time-stamp when the sum starts
|
||||
long startTime = System.nanoTime();
|
||||
// Executing the implementation to sum the numbers
|
||||
long result = implementation.sum(copy);
|
||||
// Getting a time-stamp when the sum finishes
|
||||
long endTime = System.nanoTime();
|
||||
long correct = getSum(array);
|
||||
if (correct != result) {
|
||||
// Informing if the implementation failed
|
||||
System.err.println("- ERROR: " + name + " result was: "
|
||||
+ result + " but " + correct + " was expected.");
|
||||
} else {
|
||||
// Showing the time taken by the implementation
|
||||
System.out.printf("- " + name + " time: %d ms \n"
|
||||
, ((endTime - startTime) / 1000000));
|
||||
}
|
||||
}
|
||||
|
||||
public static void main(String[] args) throws Exception {
|
||||
// Generating random numbers to be added
|
||||
int[] numbers = new int[SIZE];
|
||||
for (int i = 0; i < SIZE; i++) {
|
||||
numbers[i] = generator.nextInt();
|
||||
}
|
||||
// Executing several runs
|
||||
for (int i = 0; i < RUNS; i++) {
|
||||
System.out.println("Run " + (i + 1) + "/" + RUNS + ":");
|
||||
// Testing different implementations:
|
||||
// Sequential
|
||||
testSumImplementation(SequentialSum::sum, numbers,
|
||||
"Sequential version");
|
||||
//Parallel implementation - Multiple updates per thread
|
||||
testSumImplementation(MultipleUpdatesPerThread::sum, numbers,
|
||||
"Parallel - Multiple updates per thread");
|
||||
// Parallel - Single update per thread
|
||||
testSumImplementation(SingleUpdatePerThread::sum, numbers,
|
||||
"Parallel - Single update per thread");
|
||||
// Parallel - Multiple updates per thread - Synchronized
|
||||
testSumImplementation(MultipleUpdatesPerThreadSynch::sum, numbers,
|
||||
"Parallel - Multiple updates per thread - Synchronized");
|
||||
// Parallel - Single update per thread - Synchronized
|
||||
testSumImplementation(SingleUpdatePerThreadSynch::sum, numbers,
|
||||
"Parallel - Single update per thread - Synchronized");
|
||||
// Parallel - Multiple updates per thread - Atomic
|
||||
testSumImplementation(MultipleUpdatesPerThreadAtomic::sum, numbers,
|
||||
"Parallel - Multiple updates per thread - Atomic");
|
||||
// Parallel - Single update per thread - Atomic
|
||||
testSumImplementation(SingleUpdatePerThreadAtomic::sum, numbers,
|
||||
"Parallel - Single update per thread - Atomic");
|
||||
// Parallel - Collecting partial results
|
||||
testSumImplementation(CollectingResults::sum, numbers,
|
||||
"Parallel - Collecting partial results");
|
||||
}
|
||||
}
|
||||
}
|
||||
25
hw1/Ex2/src/semaphore/Car.java
Normal file
25
hw1/Ex2/src/semaphore/Car.java
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
package semaphore;
|
||||
|
||||
import java.util.Random;
|
||||
|
||||
public class Car {
|
||||
|
||||
// Simulated max time taken by a valet to park a car
|
||||
private static final int MAX_PARKING_TIME = 3000;
|
||||
|
||||
private final int plate;
|
||||
private static final Random generator = new Random();
|
||||
|
||||
public Car(int plate) {
|
||||
this.plate = plate;
|
||||
}
|
||||
|
||||
public int getPlate() {
|
||||
return plate;
|
||||
}
|
||||
|
||||
public void park() throws Exception {
|
||||
int time = generator.nextInt(MAX_PARKING_TIME);
|
||||
Thread.sleep(time);
|
||||
}
|
||||
}
|
||||
20
hw1/Ex2/src/semaphore/CarSimulation.java
Normal file
20
hw1/Ex2/src/semaphore/CarSimulation.java
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
package semaphore;
|
||||
|
||||
public class CarSimulation implements Runnable {
|
||||
private final Queue<Car> valetQueue;
|
||||
private final Car car;
|
||||
|
||||
public CarSimulation(Queue<Car> valetQueue, Car car) {
|
||||
this.valetQueue = valetQueue;
|
||||
this.car = car;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
try {
|
||||
valetQueue.put(car);
|
||||
} catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
System.exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
23
hw1/Ex2/src/semaphore/Main.java
Normal file
23
hw1/Ex2/src/semaphore/Main.java
Normal file
|
|
@ -0,0 +1,23 @@
|
|||
package semaphore;
|
||||
|
||||
public class Main {
|
||||
// Maximum number of cars on the queue for a valet parking service
|
||||
private static final int QUEUE_SIZE = 10;
|
||||
// Simulated number of cars
|
||||
public static final int NUM_CARS = 150;
|
||||
// Simulated number of valets
|
||||
private static final int NUM_VALETS = 5;
|
||||
|
||||
public static void main(String[] args) {
|
||||
// The shared queue
|
||||
final Queue<Car> valetQueue = new ValetQueue(QUEUE_SIZE);
|
||||
// Starting the threads simulating the cars
|
||||
for (int i = 0; i < NUM_CARS; i++) {
|
||||
new Thread(new CarSimulation(valetQueue, new Car(i))).start();
|
||||
}
|
||||
// Starting the threads simulating the valets
|
||||
for (int i = 0; i < NUM_VALETS; i++) {
|
||||
new Thread(new ValetSimulation(valetQueue), "Valet " + i ).start();
|
||||
}
|
||||
}
|
||||
}
|
||||
20
hw1/Ex2/src/semaphore/Queue.java
Normal file
20
hw1/Ex2/src/semaphore/Queue.java
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
package semaphore;
|
||||
|
||||
public interface Queue<T> {
|
||||
|
||||
/**
|
||||
* Puts an element into the queue, waiting if necessary for
|
||||
* space to become available
|
||||
* @param the element to be put into the queue
|
||||
* @throws InterruptedException if interrupted while waiting
|
||||
*/
|
||||
void put (T element) throws InterruptedException;
|
||||
|
||||
/**
|
||||
* Retrieves and removes the first element in this queue (in FIFO order),
|
||||
* waiting if necessary until a element enters the queue
|
||||
* @return the first element on this queue
|
||||
* @throws InterruptedException if interrupted while waiting
|
||||
*/
|
||||
T take() throws InterruptedException;
|
||||
}
|
||||
24
hw1/Ex2/src/semaphore/ValetQueue.java
Normal file
24
hw1/Ex2/src/semaphore/ValetQueue.java
Normal file
|
|
@ -0,0 +1,24 @@
|
|||
package semaphore;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.ArrayList;
|
||||
import java.util.concurrent.Semaphore;
|
||||
|
||||
public class ValetQueue implements Queue<Car> {
|
||||
private final List<Car> waitingCars;
|
||||
private final int queueMaxSize;
|
||||
private final Semaphore full, empty, mutex;
|
||||
|
||||
public ValetQueue(int queueMaxSize) {
|
||||
this.queueMaxSize = queueMaxSize;
|
||||
waitingCars = new ArrayList<>(queueMaxSize);
|
||||
empty = new Semaphore (queueMaxSize);
|
||||
full = new Semaphore(0);
|
||||
mutex = new Semaphore(1);
|
||||
}
|
||||
|
||||
// TODO: Implement method put
|
||||
|
||||
// TODO: Implement method take
|
||||
|
||||
}
|
||||
21
hw1/Ex2/src/semaphore/ValetSimulation.java
Normal file
21
hw1/Ex2/src/semaphore/ValetSimulation.java
Normal file
|
|
@ -0,0 +1,21 @@
|
|||
package semaphore;
|
||||
|
||||
public class ValetSimulation implements Runnable {
|
||||
private final Queue<Car> valetQueue;
|
||||
|
||||
public ValetSimulation(Queue<Car> valetQueue) {
|
||||
this.valetQueue = valetQueue;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
while (true) {
|
||||
try {
|
||||
Car car = valetQueue.take();
|
||||
car.park();
|
||||
} catch (Exception e) {
|
||||
e.printStackTrace();
|
||||
System.exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
20
hw1/Ex5/src/reentrantrwlock/CreatorSimulation.java
Normal file
20
hw1/Ex5/src/reentrantrwlock/CreatorSimulation.java
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
import java.util.List;
|
||||
|
||||
public class CreatorSimulation implements Runnable {
|
||||
|
||||
private final MovieCatalog myCatalog;
|
||||
private final List<Movie> movies;
|
||||
|
||||
public CreatorSimulation(MovieCatalog myCatalog, List<Movie> movies) {
|
||||
this.myCatalog = myCatalog;
|
||||
this.movies = movies;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
for (Movie movie : movies) {
|
||||
myCatalog.addMovie(movie);
|
||||
}
|
||||
}
|
||||
}
|
||||
49
hw1/Ex5/src/reentrantrwlock/Main.java
Normal file
49
hw1/Ex5/src/reentrantrwlock/Main.java
Normal file
|
|
@ -0,0 +1,49 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.Random;
|
||||
import java.util.ArrayList;
|
||||
|
||||
public class Main {
|
||||
// Initial number of movies in the catalog
|
||||
private static final int INITIAL_SIZE = 500;
|
||||
// Maximum duration of a movie in the catalog
|
||||
private static final int MAX_DURATION = 3000;
|
||||
// Number of users watching movies
|
||||
private static final int NUM_WATCHERS = 150;
|
||||
// Number of users reading the catalog
|
||||
private static final int NUM_READERS = 100;
|
||||
// Number of publishers adding movies
|
||||
private static final int NUM_ADDERS = 30;
|
||||
|
||||
public static void main(String[] args) throws Exception {
|
||||
// The shared catalog
|
||||
MovieCatalog myCatalog = new MovieCatalog();
|
||||
// Populating the catalog with a initial set of movies
|
||||
List<Movie> movies = new ArrayList<>(INITIAL_SIZE);
|
||||
Random generator = new Random();
|
||||
for (int i = 0; i < INITIAL_SIZE; i++) {
|
||||
movies.add(
|
||||
new Movie("Movie" + i, generator.nextInt(MAX_DURATION)));
|
||||
}
|
||||
Thread creator = new Thread(
|
||||
new CreatorSimulation(myCatalog, movies), "Creator");
|
||||
creator.start();
|
||||
creator.join();
|
||||
System.out.println("The movie catalog has been created.");
|
||||
// Starting the threads simulating the movie watchers
|
||||
for (int i = 0; i < NUM_WATCHERS; i++) {
|
||||
new Thread(new WatcherSimulation(myCatalog), "Watcher" + i).start();
|
||||
}
|
||||
// Starting the threads simulating the readers of movie titles
|
||||
for (int i = 0; i < NUM_READERS; i++) {
|
||||
new Thread(new ReaderSimulation(myCatalog), "Reader" + i).start();
|
||||
}
|
||||
// Starting the threads simulating the publishers adding movies
|
||||
for (int i = 0; i < NUM_ADDERS; i++) {
|
||||
Movie movie = new Movie("NewMovie" + i, generator.nextInt(MAX_DURATION));
|
||||
new Thread(
|
||||
new PublisherSimulation(myCatalog, movie), "Publisher" + i).start();
|
||||
}
|
||||
}
|
||||
}
|
||||
26
hw1/Ex5/src/reentrantrwlock/Movie.java
Normal file
26
hw1/Ex5/src/reentrantrwlock/Movie.java
Normal file
|
|
@ -0,0 +1,26 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
public class Movie {
|
||||
|
||||
private final String title;
|
||||
private final int duration;
|
||||
|
||||
public Movie(String title, int duration) {
|
||||
this.title = title;
|
||||
this.duration = duration;
|
||||
}
|
||||
|
||||
public String getTitle() {
|
||||
return title;
|
||||
}
|
||||
|
||||
public int getDuration() {
|
||||
return duration;
|
||||
}
|
||||
|
||||
public void play() throws Exception {
|
||||
Thread.sleep(duration);
|
||||
System.out.println("[" + Thread.currentThread().getName()
|
||||
+ "]: I've finished watching movie: " + title);
|
||||
}
|
||||
}
|
||||
66
hw1/Ex5/src/reentrantrwlock/MovieCatalog.java
Normal file
66
hw1/Ex5/src/reentrantrwlock/MovieCatalog.java
Normal file
|
|
@ -0,0 +1,66 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
import java.util.Map;
|
||||
import java.util.List;
|
||||
import java.util.Random;
|
||||
import java.util.TreeMap;
|
||||
import java.util.ArrayList;
|
||||
import java.util.concurrent.locks.Lock;
|
||||
import java.util.concurrent.locks.ReentrantReadWriteLock;
|
||||
|
||||
public class MovieCatalog {
|
||||
|
||||
private final Map<String, Movie> movies;
|
||||
private final ReentrantReadWriteLock rwlock;
|
||||
private final Lock rLock, wLock;
|
||||
private static final Random generator = new Random();
|
||||
|
||||
public MovieCatalog() {
|
||||
movies = new TreeMap<>();
|
||||
rwlock = new ReentrantReadWriteLock();
|
||||
rLock = rwlock.readLock();
|
||||
wLock = rwlock.writeLock();
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current size of this catalog
|
||||
* @return the size of this catalog
|
||||
*/
|
||||
public int getSize() {
|
||||
// TODO: Implement method getSize
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a movie from this catalog
|
||||
* @param the title of movie to be obtained
|
||||
* @return the movie with the title provided or
|
||||
* null if the movie is not in the catalog
|
||||
*/
|
||||
public Movie getMovie(String title) {
|
||||
//TODO: Implement method getMovie
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the list of all movie titles in this catalog
|
||||
* @return a list of the movie titles in this catalog
|
||||
*/
|
||||
public List<String> getTitles() {
|
||||
//TODO: Implement method getTitles
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a random movie from this catalog
|
||||
* @return a randomly selected movie from this catalog
|
||||
*/
|
||||
public Movie getRandomMovie() {
|
||||
// TODO: Implement method getRandomMovie
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a movie to the catalog
|
||||
* @param the movie to be added to the catalog
|
||||
*/
|
||||
public void addMovie(Movie movie) {
|
||||
//TODO: Implement method addMovie
|
||||
}
|
||||
}
|
||||
16
hw1/Ex5/src/reentrantrwlock/PublisherSimulation.java
Normal file
16
hw1/Ex5/src/reentrantrwlock/PublisherSimulation.java
Normal file
|
|
@ -0,0 +1,16 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
public class PublisherSimulation implements Runnable {
|
||||
|
||||
private final MovieCatalog myCatalog;
|
||||
private final Movie movie;
|
||||
|
||||
public PublisherSimulation(MovieCatalog myCatalog, Movie movie) {
|
||||
this.myCatalog = myCatalog;
|
||||
this.movie = movie;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
myCatalog.addMovie(movie);
|
||||
}
|
||||
}
|
||||
34
hw1/Ex5/src/reentrantrwlock/ReaderSimulation.java
Normal file
34
hw1/Ex5/src/reentrantrwlock/ReaderSimulation.java
Normal file
|
|
@ -0,0 +1,34 @@
|
|||
package reentrantrwlock;
|
||||
import java.util.List;
|
||||
import java.util.Random;
|
||||
|
||||
public class ReaderSimulation implements Runnable {
|
||||
|
||||
// Maximum time taken by a user to read a single title
|
||||
private static final int MAX_READING_TIME = 10;
|
||||
private static final Random generator = new Random();
|
||||
private final MovieCatalog myCatalog;
|
||||
|
||||
public ReaderSimulation(MovieCatalog myCatalog) {
|
||||
this.myCatalog = myCatalog;
|
||||
}
|
||||
|
||||
private void read() throws Exception {
|
||||
int time = generator.nextInt(MAX_READING_TIME);
|
||||
Thread.sleep(time);
|
||||
}
|
||||
|
||||
public void run() {
|
||||
try {
|
||||
List<String> titles = myCatalog.getTitles();
|
||||
for (int i = 0; i < titles.size(); i++) {
|
||||
read();
|
||||
}
|
||||
System.out.println("[" + Thread.currentThread().getName()
|
||||
+ "]: I've finished reading movie titles");
|
||||
} catch (Exception e) {
|
||||
e.printStackTrace();
|
||||
System.exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
20
hw1/Ex5/src/reentrantrwlock/WatcherSimulation.java
Normal file
20
hw1/Ex5/src/reentrantrwlock/WatcherSimulation.java
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
package reentrantrwlock;
|
||||
|
||||
public class WatcherSimulation implements Runnable {
|
||||
|
||||
private final MovieCatalog myCatalog;
|
||||
|
||||
public WatcherSimulation(MovieCatalog myCatalog) {
|
||||
this.myCatalog = myCatalog;
|
||||
}
|
||||
|
||||
public void run() {
|
||||
Movie movie = myCatalog.getRandomMovie();
|
||||
try {
|
||||
movie.play();
|
||||
} catch (Exception e) {
|
||||
e.printStackTrace();
|
||||
System.exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
32
hw1/submission.tex
Normal file
32
hw1/submission.tex
Normal file
|
|
@ -0,0 +1,32 @@
|
|||
\documentclass[12pt]{article}
|
||||
|
||||
\usepackage[utf8]{inputenc}
|
||||
%\usepackage[margin=2cm]{geometry}
|
||||
|
||||
\title{Howework 1 -- Programming Fundamentals 3}
|
||||
\author{Claudio Maggioni}
|
||||
|
||||
\begin{document}
|
||||
\maketitle
|
||||
\section{Exercise 1}
|
||||
\subsection{Question 1}
|
||||
\texttt{MultipleUpdatesPerThread} is neither correct nor efficient. The reason for its uncorrectness is the unsynchronized access
|
||||
of \emph{result}, which assigns unconsistent values to it: non-atomic evaluation of the statement \texttt{result += partialSum;}
|
||||
can make one thread evaluate the new value for \emph{result} before another has finished writing to it, thus producing incorrect
|
||||
results.
|
||||
|
||||
By synchronising the access to \emph{result}, we effectively make the application sequential, since only one thread at a time can
|
||||
change result. Therefore, \texttt{MultipleUpdatesPerThread} runs even worse than \texttt{SequentialSum} since it has to cope with
|
||||
all the synchronization overhead.
|
||||
\subsection{Question 2}
|
||||
While more efficient, \texttt{SingleUpdatePerThread} is still wrong because the access to \emph{result} is still not synchronized.
|
||||
Again, non-atomic evaluation of the statement \texttt{result += partialSum;} can make one thread evaluate the new value for \emph{result} before another has finished writing to it, thus producing incorrect
|
||||
results.
|
||||
\subsection{Question 6}
|
||||
\texttt{CollectingResults} is the only Thread-safe implementation because it is the only one not to use a static field to compute
|
||||
the final result. If multiple threads use anyone of the other classes concurrently, \emph{result} will be shared between the
|
||||
threads and all the results will be inconsistent. In order to solve this problem, either the entire \texttt{sum(...)} method must
|
||||
be considered a critical section (defeating the point of concurrent access to the summing class) or the scope of result must be
|
||||
bound to the thread (e.g. by making \emph{result} either a private field and making the inner classes non-static, or by making it
|
||||
a local variable, as \texttt{CollectingResults} does).
|
||||
\end{document}
|
||||
Reference in a new issue