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/* All OK */
#include <pthread.h>
static pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
static int shared;
static void *th(void *v)
{
pthread_mutex_lock(&mx);
shared++;
pthread_mutex_unlock(&mx);
return 0;
}
int main()
{
pthread_t a, b;
pthread_mutex_lock(&mx);
pthread_mutex_unlock(&mx);
pthread_create(&a, NULL, th, NULL);
pthread_create(&b, NULL, th, NULL);
pthread_join(a, NULL);
pthread_join(b, NULL);
return 0;
}
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