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bool JSemaphore::Wait(unsigned int time_ms) { | |
struct timespec waittime; | |
struct timeval now; | |
if (gettimeofday(&now, NULL) == -1) { | |
assert("Unable to get time by clock_gettime!" == 0); | |
return false; | |
} | |
waittime.tv_nsec = ((time_ms % 1000) * 1000 * 1000) + (now.tv_usec * 1000); | |
waittime.tv_sec = (time_ms / 1000) + (waittime.tv_nsec / (1000*1000*1000)) + now.tv_sec; | |
waittime.tv_nsec %= 1000*1000*1000; | |
errno = 0; | |
int sem_wait_retval = sem_trywait(&m_semaphore); | |
struct timeval my_time; | |
if (gettimeofday(&my_time, NULL) == -1) { | |
assert("Unable to get time by clock_gettime!" == 0); | |
return false; | |
} | |
while ( (sem_wait_retval != 0) && (my_time.tv_sec >= waittime.tv_sec) && (my_time.tv_usec >= waittime.tv_nsec*1000) ) { | |
struct timespec mytimespec = { 0,(100*1000)) }; | |
nanosleep(mytimespec); | |
sem_wait_retval = sem_trywait(&m_semaphore); | |
if (gettimeofday(&my_time, NULL) == -1) { | |
assert("Unable to get time by clock_gettime!" == 0); | |
return false; | |
} | |
} | |
if (sem_wait_retval == 0) | |
{ | |
return true; | |
} | |
else { | |
assert((errno == ETIMEDOUT) || (errno == EINTR)); | |
return false; | |
} | |
return sem_wait_retval == 0 ? true : false; | |
} |
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