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This commit is contained in:
Bassem Girgis
2018-10-17 23:47:57 -05:00
parent 558e8e22da
commit c8a8949366
56 changed files with 4153 additions and 3900 deletions
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81
src/ch05/once.c
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@@ -16,56 +16,59 @@ pthread_mutex_t mutex;
* with the same control structure are made during the course of
* the program.
*/
void once_init_routine (void)
void
once_init_routine(void)
{
int status;
int status;
status = pthread_mutex_init (&mutex, NULL);
if (status != 0)
err_abort (status, "Init Mutex");
status = pthread_mutex_init(&mutex, NULL);
if (status != 0)
err_abort(status, "Init Mutex");
}
/*
* Thread start routine that calls pthread_once.
*/
void *thread_routine (void *arg)
void*
thread_routine(void* arg)
{
int status;
int status;
status = pthread_once (&once_block, once_init_routine);
if (status != 0)
err_abort (status, "Once init");
status = pthread_mutex_lock (&mutex);
if (status != 0)
err_abort (status, "Lock mutex");
printf ("thread_routine has locked the mutex.\n");
status = pthread_mutex_unlock (&mutex);
if (status != 0)
err_abort (status, "Unlock mutex");
return NULL;
status = pthread_once(&once_block, once_init_routine);
if (status != 0)
err_abort(status, "Once init");
status = pthread_mutex_lock(&mutex);
if (status != 0)
err_abort(status, "Lock mutex");
printf("thread_routine has locked the mutex.\n");
status = pthread_mutex_unlock(&mutex);
if (status != 0)
err_abort(status, "Unlock mutex");
return NULL;
}
int main (int argc, char *argv[])
int
main(int argc, char* argv[])
{
pthread_t thread_id;
char *input, buffer[64];
int status;
pthread_t thread_id;
char *input, buffer[64];
int status;
status = pthread_create (&thread_id, NULL, thread_routine, NULL);
if (status != 0)
err_abort (status, "Create thread");
status = pthread_once (&once_block, once_init_routine);
if (status != 0)
err_abort (status, "Once init");
status = pthread_mutex_lock (&mutex);
if (status != 0)
err_abort (status, "Lock mutex");
printf ("Main has locked the mutex.\n");
status = pthread_mutex_unlock (&mutex);
if (status != 0)
err_abort (status, "Unlock mutex");
status = pthread_join (thread_id, NULL);
if (status != 0)
err_abort (status, "Join thread");
return 0;
status = pthread_create(&thread_id, NULL, thread_routine, NULL);
if (status != 0)
err_abort(status, "Create thread");
status = pthread_once(&once_block, once_init_routine);
if (status != 0)
err_abort(status, "Once init");
status = pthread_mutex_lock(&mutex);
if (status != 0)
err_abort(status, "Lock mutex");
printf("Main has locked the mutex.\n");
status = pthread_mutex_unlock(&mutex);
if (status != 0)
err_abort(status, "Unlock mutex");
status = pthread_join(thread_id, NULL);
if (status != 0)
err_abort(status, "Join thread");
return 0;
}