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demo_mutex.c
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/
demo_mutex.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* demo_mutex.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: gallard <gallard@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2015/07/20 04:17:13 by gallard #+# #+# */
/* Updated: 2015/07/20 04:41:50 by gallard ### ########.fr */
/* */
/* ************************************************************************** */
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#define handle_error_en(en, msg) \
do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
static void *
thread_func(void *ignored_argument)
{
int s;
s = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (s != 0)
handle_error_en(s, "pthread_setcancelstate");
printf("thread_func(): started; cancellation disabled\n");
printf("thread_func(): about to enable cancellation\n");
s = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (s != 0)
handle_error_en(s, "pthread_setcancelstate");
char *p;
size_t i = 0;
while (i < 10000)
{
p = malloc(128);
if (p)
p[0] = 42;
i++;
}
printf("thread_func(): not canceled!\n");
return NULL;
}
int
main(void)
{
pthread_t thr;
void *res;
int s;
s = pthread_create(&thr, NULL, &thread_func, NULL);
if (s != 0)
handle_error_en(s, "pthread_create");
char *p;
size_t i = 1000;
p = 0;
while (i < 4000)
{
p = realloc(p, i);
if (p)
p[0] = 42;
else
{
puts("no");
exit(1);
}
i++;
}
printf("main(): sending cancellation request\n");
s = pthread_cancel(thr);
if (s != 0)
handle_error_en(s, "pthread_cancel");
s = pthread_join(thr, &res);
if (s != 0)
handle_error_en(s, "pthread_join");
if (res == PTHREAD_CANCELED)
printf("main(): thread was canceled\n");
else
printf("main(): thread wasn't canceled (shouldn't happen!)\n");
show_alloc_mem();
exit(EXIT_SUCCESS);
}