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Red Hat Bugzilla – Attachment 845976 Details for
Bug 1048731
pthread_cond_timedwait latency
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the test.c for this problem
test.c (text/plain), 703 bytes, created by
wq
on 2014-01-06 09:28:31 UTC
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Description:
the test.c for this problem
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Creator:
wq
Created:
2014-01-06 09:28:31 UTC
Size:
703 bytes
patch
obsolete
>#include <stdio.h> >#include <pthread.h> > >int main() >{ > struct timespec t1,t2; > pthread_mutex_t mutex; > pthread_cond_t cond = PTHREAD_COND_INITIALIZER; > pthread_mutex_init(&mutex,NULL); > > clock_gettime(CLOCK_REALTIME, &t1); > pthread_mutex_lock(&mutex); > pthread_cond_timedwait(&cond, &mutex, &t1); > pthread_mutex_unlock(&mutex); > > clock_gettime(CLOCK_REALTIME, &t2); > > pthread_mutex_destroy(&mutex); > pthread_cond_destroy(&cond); > > if(t2.tv_nsec >= t1.tv_nsec) > { > t2.tv_sec -= t1.tv_sec; > t2.tv_nsec -= t1.tv_nsec; > }else{ > t2.tv_sec = t2.tv_sec - t1.tv_sec - 1; > t2.tv_nsec = t2.tv_nsec +(1000000000-t1.tv_nsec); > } > > printf("cond wait spend time: %d.%.9d\n", t2.tv_sec, t2.tv_nsec); > return 0; >}
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