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/** Cancel a thread that holds a lock on a mutex. */
#include <assert.h>
#include <pthread.h>
#include <stdio.h>
pthread_cond_t s_cond;
pthread_mutex_t s_mutex1;
pthread_mutex_t s_mutex2;
static void* thread(void* arg)
{
/* Lock s_mutex2. */
pthread_mutex_lock(&s_mutex2);
/* Inform the main thread that s_mutex2 has been locked, and wait for pthread_cancel(). */
pthread_mutex_lock(&s_mutex1);
pthread_cond_signal(&s_cond);
pthread_cond_wait(&s_cond, &s_mutex1);
return 0;
}
int main(int argc, char** argv)
{
pthread_t tid;
/* Initialize synchronization objects. */
pthread_cond_init(&s_cond, 0);
pthread_mutex_init(&s_mutex1, 0);
pthread_mutex_init(&s_mutex2, 0);
/* Create thread. */
pthread_mutex_lock(&s_mutex1);
pthread_create(&tid, 0, &thread, 0);
/* Wait until the created thread has locked s_mutex2. */
pthread_cond_wait(&s_cond, &s_mutex1);
pthread_mutex_unlock(&s_mutex1);
/* Cancel the created thread. */
pthread_cancel(tid);
/* Join the created thread. */
pthread_join(tid, 0);
/* Invoke pthread_cancel() with an invalid thread ID. */
pthread_cancel(tid);
fprintf(stderr, "Test finished.\n");
return 0;
}
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