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418902218c
it has tremendous performance problems.
* Implement pthread_key_{create,delete} and pthread_{set,get}specific.
* Implement pthread_cond_timedwait. A nuisance.
* New timer infrastructure, based on the RDTSC instruction. This
allows fast, accurate time measurement without swamping the host with
gettimeofday() syscalls.
There's something definitely screwy about the scheduler, making opera
run slowly and mozilla run unbelievably slowly. To be investigated.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@119
105 lines
1.8 KiB
C
105 lines
1.8 KiB
C
/********************************************************
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* An example source module to accompany...
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*
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* "Using POSIX Threads: Programming with Pthreads"
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* by Brad nichols, Dick Buttlar, Jackie Farrell
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* O'Reilly & Associates, Inc.
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*
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********************************************************
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* specific.c
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <pthread.h>
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#define NUM_THREADS 3
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pthread_key_t saved_time_key;
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void free_time(void *arg )
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{
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struct timeval *timev=(struct timeval *)arg;
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printf("free_time:\n");
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free(timev);
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}
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void save_the_time(void)
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{
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struct timeval *timev;
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timev = (struct timeval *)malloc(sizeof(struct timeval));
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gettimeofday(timev, NULL);
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printf("save_the_time: \t\t%ld %ld\n",timev->tv_sec, timev->tv_usec);
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pthread_setspecific(saved_time_key, (void *)timev);
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}
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void what_time_did_i_save(void)
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{
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struct timeval *timev;
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timev = pthread_getspecific(saved_time_key);
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printf("what_time_did_i_save: \t%ld %ld\n",timev->tv_sec, timev->tv_usec);
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}
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void *thread_routine(void *arg)
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{
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int *my_id=(int *)arg;
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printf("thread_routine %d\n", *my_id);
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save_the_time();
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what_time_did_i_save();
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return(NULL);
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}
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extern int
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main(void)
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{
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int i, *id_arg;
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pthread_t threads[NUM_THREADS];
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id_arg = (int *)malloc(NUM_THREADS*sizeof(int));
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printf("main : initializing the key\n");
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pthread_key_create(&saved_time_key, free_time);
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printf("main : spawing the threads\n");
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for (i = 0; i < NUM_THREADS; i++) {
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id_arg[i] = i;
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pthread_create(&(threads[i]),
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NULL,
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thread_routine,
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(void *) &(id_arg[i]));
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}
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for (i = 0; i < NUM_THREADS; i++) {
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pthread_join(threads[i], NULL);
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printf("main : thread %d has finished. \n", i);
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}
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printf("main : goodbye\n");
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return 0;
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}
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