newlib-cygwin/winsup/testsuite/winsup.api/pthread/mutex3.c

44 lines
680 B
C

/*
* mutex3.c
*
* Declare a static mutex object, lock it, trylock it,
* and then unlock it again.
*
* Depends on API functions:
* pthread_mutex_lock()
* pthread_mutex_trylock()
* pthread_mutex_unlock()
*/
#include "test.h"
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
static int washere = 0;
void * func(void * arg)
{
assert(pthread_mutex_trylock(&mutex1) == EBUSY);
washere = 1;
return 0;
}
int
main()
{
pthread_t t;
assert(pthread_mutex_lock(&mutex1) == 0);
assert(pthread_create(&t, NULL, func, NULL) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mutex1) == 0);
assert(washere == 1);
return 0;
}