hw3: process_wait implemented
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b7b1051190
commit
4e5c2e960d
3 changed files with 31 additions and 5 deletions
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@ -426,8 +426,10 @@ thread_exit (void)
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and schedule another process. That process will destroy us
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when it calls thread_schedule_tail(). */
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intr_disable ();
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list_remove (&thread_current()->allelem);
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struct thread* t = thread_current();
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list_remove (&t->allelem);
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thread_current ()->status = THREAD_DYING;
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sema_up(&t->waiting_sem);
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schedule ();
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NOT_REACHED ();
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}
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@ -572,6 +574,7 @@ init_thread (struct thread *t, const char *name, int priority)
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t->status = THREAD_BLOCKED;
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strlcpy (t->name, name, sizeof t->name);
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t->stack = (uint8_t *) t + PGSIZE;
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sema_init(&t->waiting_sem, 0);
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if (thread_mlfqs) {
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t->nice_init = priority > 20 || priority < 20 ? 0 : priority;
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@ -710,6 +713,21 @@ schedule (void)
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thread_schedule_tail (prev);
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}
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struct thread *
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thread_get_by_tid (tid_t tid)
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{
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struct list_elem *e;
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for (e = list_begin (&all_list);
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e != list_end (&all_list);
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e = list_next (e))
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{
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struct thread *t = list_entry (e, struct thread, allelem);
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if (t->tid == tid)
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return t;
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}
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return NULL;
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}
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/* Returns a tid to use for a new thread. */
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static tid_t
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allocate_tid (void)
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@ -8,6 +8,7 @@
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#include <list.h>
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#include <stdint.h>
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#include "threads/fpr_arith.h"
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#include "threads/synch.h"
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/* States in a thread's life cycle. */
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enum thread_status
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@ -99,6 +100,7 @@ struct thread
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int nice;
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int nice_init;
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FPReal recent_cpu;
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struct semaphore waiting_sem;
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#ifdef USERPROG
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/* Owned by userprog/process.c. */
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@ -147,5 +149,5 @@ int thread_get_nice (void);
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void thread_set_nice (int);
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int thread_get_recent_cpu (void);
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int thread_get_load_avg (void);
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#endif /* threads/thread.h */
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struct thread* thread_get_by_tid(tid_t);
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#endif /* threads/thread.h */
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@ -86,9 +86,15 @@ start_process (void *file_name_)
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This function will be implemented in problem 2-2. For now, it
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does nothing. */
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int
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process_wait (tid_t child_tid UNUSED)
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process_wait (tid_t child_tid)
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{
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return -1;
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struct thread* child = thread_get_by_tid(child_tid);
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if (child == NULL) {
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return -1;
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}
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sema_down(&child->waiting_sem);
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return 0;
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}
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/* Free the current process's resources. */
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