mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 08:26:14 +00:00
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/** Cancel a thread that holds a lock on a mutex. */
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#include <assert.h>
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#include <pthread.h>
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#include <stdio.h>
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pthread_cond_t s_cond;
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pthread_mutex_t s_mutex1;
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pthread_mutex_t s_mutex2;
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static void* thread(void* arg)
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{
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/* Lock s_mutex2. */
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pthread_mutex_lock(&s_mutex2);
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/* Inform the main thread that s_mutex2 has been locked, and wait for pthread_cancel(). */
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pthread_mutex_lock(&s_mutex1);
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pthread_cond_signal(&s_cond);
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pthread_cond_wait(&s_cond, &s_mutex1);
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return 0;
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}
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int main(int argc, char** argv)
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{
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pthread_t tid;
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/* Initialize synchronization objects. */
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pthread_cond_init(&s_cond, 0);
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pthread_mutex_init(&s_mutex1, 0);
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pthread_mutex_init(&s_mutex2, 0);
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/* Create thread. */
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pthread_mutex_lock(&s_mutex1);
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pthread_create(&tid, 0, &thread, 0);
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/* Wait until the created thread has locked s_mutex2. */
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pthread_cond_wait(&s_cond, &s_mutex1);
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pthread_mutex_unlock(&s_mutex1);
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/* Cancel the created thread. */
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pthread_cancel(tid);
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/* Join the created thread. */
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pthread_join(tid, 0);
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/* Invoke pthread_cancel() with an invalid thread ID. */
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pthread_cancel(tid);
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fprintf(stderr, "Test finished.\n");
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return 0;
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}
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