hung pthread_cond_timedwait on uCLinux with v2linux
From: OferH (oferh_at_radlan.com)
Date: 06/27/04
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Date: 27 Jun 2004 05:35:10 -0700
hi folks,
I have an application running on ARM946 with uClinux OS and Montavista
v2linux.
A thread performs a semaphore take (semTake) with timeout which
v2linux code implements (with conditional variable) as a call to
pthread_cond_timedwait. This call gets hung, I do not get a timeout
(ETIMEDOUT) or any other return code. It seems that the thread stack
got messed up somehow. If I change the call to a semTake(FOREVER) this
does not occure (i.e. the thread lives). If I replace the
pthread_cond_timedwait call with a delay of several seconds it does
not occure.
To disable the problem of stack overflow I created a new thread to
test this, here is the code:
unsigned __TASKCONV testTask(void)
{
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
struct timeval now;
struct timespec timeout;
int retcode;
if (pthread_mutex_lock(&mutex) != 0)
{
fprintf(stderr, "\r\n pthread_mutex_lock failed
%s",strerror(errno));
exit(0);
}
while (1)
{
if (gettimeofday(&now, NULL) != 0)
{
fprintf(stderr, "\r\n gettimeofday failed
%s",strerror(errno));
}
timeout.tv_sec = now.tv_sec + 5;
timeout.tv_nsec = now.tv_usec * 1000;
fprintf(stderr, "\r\n before pthread_cond_timedwait");
retcode = pthread_cond_timedwait(&cond, &mutex, &timeout);
fprintf(stderr, "\r\n after pthread_cond_timedwait");
if (retcode == ETIMEDOUT)
{
/* timeout occurred */
fprintf(stderr, "\r\n retcode == ETIMEDOUT");
}
else
{
/* operate on x and y */
fprintf(stderr, "\r\n retcode != ETIMEDOUT");
}
/*pthread_mutex_unlock(&mut);*/
}
}
When running this thread I only see the "before
pthread_cond_timedwait" print!
Does anybody know of the same problem I have encountered? What am I
doing wrong?
Tx,
Ofer
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