6562983234
Calling mutex_lock from one thread and then mutex_unlock from another is not permitted. Replace the awkward mutex usage with a mutex and condition variable. llvm.org/pr18061 llvm-svn: 205900
58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
#include <pthread.h>
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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void *
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thread3 (void *input)
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_signal(&cond); // Set break point at this line.
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pthread_mutex_unlock(&mutex);
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return NULL;
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}
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void *
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thread2 (void *input)
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{
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pthread_mutex_lock(&mutex);
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pthread_cond_signal(&cond);
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pthread_cond_wait(&cond, &mutex);
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pthread_mutex_unlock(&mutex);
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return NULL;
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}
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void *
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thread1 (void *input)
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{
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pthread_t thread_2;
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pthread_create (&thread_2, NULL, thread2, NULL);
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pthread_join(thread_2, NULL);
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return NULL;
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}
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int main ()
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{
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pthread_t thread_1;
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pthread_t thread_3;
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pthread_mutex_lock (&mutex);
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pthread_create (&thread_1, NULL, thread1, NULL);
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pthread_cond_wait (&cond, &mutex);
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pthread_create (&thread_3, NULL, thread3, NULL);
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pthread_cond_wait (&cond, &mutex);
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pthread_mutex_unlock (&mutex);
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pthread_join (thread_1, NULL);
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pthread_join (thread_3, NULL);
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return 0;
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}
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