Assignment1: done Ex1 1-6
This commit is contained in:
Claudio Maggioni
commit
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*.pdf
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## Core latex/pdflatex auxiliary files:
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*.aux
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*.lof
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*.log
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*.lot
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*.fls
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*.out
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*.toc
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||||
*.fmt
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||||
*.fot
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||||
*.cb
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||||
*.cb2
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.*.lb
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||||
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## Intermediate documents:
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||||
*.dvi
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||||
*.xdv
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*-converted-to.*
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# these rules might exclude image files for figures etc.
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# *.ps
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# *.eps
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# *.pdf
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## Generated if empty string is given at "Please type another file name for output:"
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.pdf
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||||
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## Bibliography auxiliary files (bibtex/biblatex/biber):
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*.bbl
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*.bcf
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||||
*.blg
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*-blx.aux
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*-blx.bib
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*.run.xml
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||||
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## Build tool auxiliary files:
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*.fdb_latexmk
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*.synctex
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*.synctex(busy)
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*.synctex.gz
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*.synctex.gz(busy)
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*.pdfsync
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## Build tool directories for auxiliary files
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# latexrun
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latex.out/
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## Auxiliary and intermediate files from other packages:
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# algorithms
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*.alg
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*.loa
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# 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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#(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
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*.acr
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*.glg
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*.glo
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*.gls
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*.glsdefs
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*.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
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*-gnuplottex-*
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# gregoriotex
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*.gaux
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*.gtex
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# htlatex
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*.4ct
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*.4tc
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*.idv
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*.lg
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*.trc
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*.xref
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# hyperref
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*.brf
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# knitr
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*-concordance.tex
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# TODO Comment the next line if you want to keep your tikz graphics files
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*.tikz
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*-tikzDictionary
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# listings
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*.lol
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# luatexja-ruby
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*.ltjruby
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# makeidx
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*.idx
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*.ilg
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*.ind
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# minitoc
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*.maf
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*.mlf
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*.mlt
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*.mtc[0-9]*
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*.slf[0-9]*
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*.slt[0-9]*
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*.stc[0-9]*
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# minted
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_minted*
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*.pyg
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# morewrites
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*.mw
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# nomencl
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*.nlg
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*.nlo
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*.nls
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# pax
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*.pax
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# pdfpcnotes
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*.pdfpc
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# sagetex
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*.sagetex.sage
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*.sagetex.py
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*.sagetex.scmd
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# scrwfile
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*.wrt
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# sympy
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*.sout
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*.sympy
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sympy-plots-for-*.tex/
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# pdfcomment
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*.upa
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*.upb
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# pythontex
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*.pytxcode
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pythontex-files-*/
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# tcolorbox
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*.listing
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# thmtools
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*.loe
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# TikZ & PGF
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*.dpth
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*.md5
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*.auxlock
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# todonotes
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*.tdo
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# vhistory
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*.hst
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*.ver
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# easy-todo
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*.lod
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# xcolor
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*.xcp
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# xmpincl
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*.xmpi
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# xindy
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*.xdy
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# xypic precompiled matrices and outlines
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*.xyc
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*.xyd
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# endfloat
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*.ttt
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*.fff
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# Latexian
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TSWLatexianTemp*
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## Editors:
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# WinEdt
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*.bak
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*.sav
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# Texpad
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.texpadtmp
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# LyX
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*.lyx~
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# Kile
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*.backup
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# gummi
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.*.swp
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# KBibTeX
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*~[0-9]*
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# auto folder when using emacs and auctex
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./auto/*
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*.el
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# expex forward references with \gathertags
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*-tags.tex
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# standalone packages
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*.sta
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# Makeindex log files
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*.lpz
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||||
# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
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||||
# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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||||
.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/**/usage.statistics.xml
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||||
.idea/**/dictionaries
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.idea/**/shelf
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# Generated files
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.idea/**/contentModel.xml
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# Sensitive or high-churn files
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/**/dbnavigator.xml
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# Gradle
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.idea/**/gradle.xml
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.idea/**/libraries
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# Gradle and Maven with auto-import
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# When using Gradle or Maven with auto-import, you should exclude module files,
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# since they will be recreated, and may cause churn. Uncomment if using
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# auto-import.
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# .idea/modules.xml
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# .idea/*.iml
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# .idea/modules
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# *.iml
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# *.ipr
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# CMake
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cmake-build-*/
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# Mongo Explorer plugin
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.idea/**/mongoSettings.xml
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||||
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||||
# File-based project format
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||||
*.iws
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# IntelliJ
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out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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||||
atlassian-ide-plugin.xml
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||||
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||||
# Cursive Clojure plugin
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||||
.idea/replstate.xml
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||||
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||||
# Crashlytics plugin (for Android Studio and IntelliJ)
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||||
com_crashlytics_export_strings.xml
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crashlytics.properties
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||||
crashlytics-build.properties
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fabric.properties
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# Editor-based Rest Client
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.idea/httpRequests
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# Android studio 3.1+ serialized cache file
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.idea/caches/build_file_checksums.ser
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@ -0,0 +1,12 @@
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<content url="file://$MODULE_DIR$">
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<excludeFolder url="file://$MODULE_DIR$/out" />
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@ -0,0 +1,11 @@
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<option name="myName" value="Project Default" />
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||||
<option value="$PROJECT_DIR$/src/synchronized1/MultipleUpdatesPerThreadSynch.java" />
|
||||
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|
||||
<option value="$PROJECT_DIR$/src/synchronized2/SingleUpdatePerThreadSynch.java" />
|
||||
<option value="$PROJECT_DIR$/src/atomic1/MultipleUpdatesPerThreadAtomic.java" />
|
||||
<option value="$PROJECT_DIR$/src/atomic2/SingleUpdatePerThreadAtomic.java" />
|
||||
<option value="$PROJECT_DIR$/src/parallel/CollectingResults.java" />
|
||||
<option value="$PROJECT_DIR$/src/test/Test.java" />
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<option name="width" value="1680" />
|
||||
<option name="height" value="1050" />
|
||||
</component>
|
||||
<component name="ProjectLevelVcsManager" settingsEditedManually="true" />
|
||||
<component name="ProjectView">
|
||||
<navigator proportions="" version="1">
|
||||
<foldersAlwaysOnTop value="true" />
|
||||
</navigator>
|
||||
<panes>
|
||||
<pane id="PackagesPane" />
|
||||
<pane id="Scope" />
|
||||
<pane id="ProjectPane">
|
||||
<subPane>
|
||||
<expand>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
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|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="atomic1" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="atomic2" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="parallel" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="sequential" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="simple1" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="simple2" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="synchronized1" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="synchronized2" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
<path>
|
||||
<item name="Ex1" type="b2602c69:ProjectViewProjectNode" />
|
||||
<item name="Ex1" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="src" type="462c0819:PsiDirectoryNode" />
|
||||
<item name="test" type="462c0819:PsiDirectoryNode" />
|
||||
</path>
|
||||
</expand>
|
||||
<select />
|
||||
</subPane>
|
||||
</pane>
|
||||
</panes>
|
||||
</component>
|
||||
<component name="PropertiesComponent">
|
||||
<property name="ASKED_SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
|
||||
<property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
|
||||
<property name="WebServerToolWindowFactoryState" value="false" />
|
||||
<property name="aspect.path.notification.shown" value="true" />
|
||||
<property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
|
||||
<property name="nodejs_npm_path_reset_for_default_project" value="true" />
|
||||
<property name="project.structure.last.edited" value="Project" />
|
||||
<property name="project.structure.proportion" value="0.15" />
|
||||
<property name="project.structure.side.proportion" value="0.2" />
|
||||
</component>
|
||||
<component name="RunDashboard">
|
||||
<option name="ruleStates">
|
||||
<list>
|
||||
<RuleState>
|
||||
<option name="name" value="ConfigurationTypeDashboardGroupingRule" />
|
||||
</RuleState>
|
||||
<RuleState>
|
||||
<option name="name" value="StatusDashboardGroupingRule" />
|
||||
</RuleState>
|
||||
</list>
|
||||
</option>
|
||||
</component>
|
||||
<component name="RunManager">
|
||||
<configuration name="Test" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
|
||||
<option name="MAIN_CLASS_NAME" value="test.Test" />
|
||||
<module name="Ex1" />
|
||||
<extension name="coverage">
|
||||
<pattern>
|
||||
<option name="PATTERN" value="test.*" />
|
||||
<option name="ENABLED" value="true" />
|
||||
</pattern>
|
||||
</extension>
|
||||
<method v="2">
|
||||
<option name="Make" enabled="true" />
|
||||
</method>
|
||||
</configuration>
|
||||
<recent_temporary>
|
||||
<list>
|
||||
<item itemvalue="Application.Test" />
|
||||
</list>
|
||||
</recent_temporary>
|
||||
</component>
|
||||
<component name="SvnConfiguration">
|
||||
<configuration />
|
||||
</component>
|
||||
<component name="TaskManager">
|
||||
<task active="true" id="Default" summary="Default task">
|
||||
<changelist id="d712734b-6034-468c-b553-7e4d8f6128c3" name="Default Changelist" comment="" />
|
||||
<created>1570613444806</created>
|
||||
<option name="number" value="Default" />
|
||||
<option name="presentableId" value="Default" />
|
||||
<updated>1570613444806</updated>
|
||||
<workItem from="1570613448664" duration="3062000" />
|
||||
</task>
|
||||
<servers />
|
||||
</component>
|
||||
<component name="TimeTrackingManager">
|
||||
<option name="totallyTimeSpent" value="3062000" />
|
||||
</component>
|
||||
<component name="ToolWindowManager">
|
||||
<frame x="0" y="0" width="1059" height="1050" extended-state="0" />
|
||||
<layout>
|
||||
<window_info id="Designer" />
|
||||
<window_info id="Image Layers" />
|
||||
<window_info id="Capture Tool" />
|
||||
<window_info id="UI Designer" />
|
||||
<window_info id="Favorites" side_tool="true" />
|
||||
<window_info id="Learn" />
|
||||
<window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.23500492" />
|
||||
<window_info id="Structure" order="1" side_tool="true" weight="0.25" />
|
||||
<window_info anchor="bottom" id="Terminal" />
|
||||
<window_info anchor="bottom" id="Docker" show_stripe_button="false" />
|
||||
<window_info anchor="bottom" id="Event Log" side_tool="true" />
|
||||
<window_info anchor="bottom" id="Database Changes" />
|
||||
<window_info anchor="bottom" id="Version Control" />
|
||||
<window_info anchor="bottom" id="Messages" />
|
||||
<window_info anchor="bottom" id="Message" order="0" />
|
||||
<window_info anchor="bottom" id="Find" order="1" />
|
||||
<window_info anchor="bottom" id="Run" order="2" weight="0.32959184" />
|
||||
<window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
|
||||
<window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
|
||||
<window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
|
||||
<window_info anchor="bottom" id="TODO" order="6" />
|
||||
<window_info anchor="right" id="Maven" />
|
||||
<window_info anchor="right" id="Palette" />
|
||||
<window_info anchor="right" id="Capture Analysis" />
|
||||
<window_info anchor="right" id="Database" />
|
||||
<window_info anchor="right" id="Palette	" />
|
||||
<window_info anchor="right" id="Theme Preview" />
|
||||
<window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
|
||||
<window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
|
||||
<window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
|
||||
</layout>
|
||||
</component>
|
||||
<component name="TypeScriptGeneratedFilesManager">
|
||||
<option name="version" value="1" />
|
||||
</component>
|
||||
<component name="editorHistoryManager">
|
||||
<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>
|
||||
<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>
|
||||
<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>
|
||||
<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>
|
||||
<entry file="file://$PROJECT_DIR$/src/atomic2/SingleUpdatePerThreadAtomic.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="175">
|
||||
<caret line="29" column="8" selection-start-line="29" selection-start-column="8" selection-end-line="29" selection-end-column="8" />
|
||||
<folding>
|
||||
<element signature="e#300#301#0" expanded="true" />
|
||||
<element signature="e#324#325#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<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>
|
||||
<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>
|
||||
<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>
|
||||
<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>
|
||||
</component>
|
||||
<component name="masterDetails">
|
||||
<states>
|
||||
<state key="ArtifactsStructureConfigurable.UI">
|
||||
<settings>
|
||||
<artifact-editor />
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="FacetStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>No facets are configured</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="GlobalLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="JdkListConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ModuleStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>Ex1</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ProjectLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
</states>
|
||||
</component>
|
||||
</project>
|
||||
|
|
@ -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]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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;
|
||||
}
|
||||
}
|
||||
|
|
@ -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]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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]);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
package test;
|
||||
|
||||
@FunctionalInterface
|
||||
public interface SumFunction {
|
||||
long sum(int[] nums) throws Exception;
|
||||
}
|
||||
|
|
@ -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");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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;
|
||||
}
|
||||
|
|
@ -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
|
||||
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
|
|
@ -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
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -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 New Issue