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Message-ID: <3B7AC4B8.9EAD158B@sibbald.com>
Date: Wed, 15 Aug 2001 20:51:36 +0200
From: Kern Sibbald <kern AT sibbald DOT com>
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: pthread_cond_timedwait() problem
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Hello,

The attached program seems to work fine on Linux, but
dies with a segmentation fault when compiled with Cygwin
and run on Win98.

To compile on Linux:

   cc xxx.c -o xxx -lpthread

Output: each line is printed after a wait of 10 seconds:

   Timed out
  Second timedwait timed out

To compile on Cygwin:

  gcc  xxx.c -o xxx.exe

Output:
         0 [main] xxx 995963 open_stackdumpfile: Dumping stack trace
to XXX.EXE.stackdump
      Segmentation fault (core dumped)

I'm using:
   CYGWIN_98-4.10 MINIMATOU 1.3.2(0.39/3/2) 2001-05-20 23:28 i586
unknown

I'm not subscribed to your list, so if you wish to respond, please
include
my email address.  Any help making this program work would be
appreciated.

Best regards,

Kern


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#define _REENTRANT 1
#define _THREAD_SAFE 1

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <errno.h>
#include <pthread.h>

typedef struct workq_tag {
   pthread_mutex_t   mutex;	      /* queue access control */
   pthread_cond_t    work;	      /* wait for work */
   pthread_attr_t    attr;	      /* create detached threads */
   int		     valid;	      /* queue initialized */
   int		     quit;	      /* workq should quit */
   int		     max_workers;     /* max threads */
   int		     num_workers;     /* current threads */
   int		     idle_workers;    /* idle threads */
   void 	     (*engine)(void *arg); /* user engine */
} workq_t;


int main()
{
   struct timespec to;
   workq_t *wq; 		
   int stat;
   struct timeval tv;
   struct timezone tz;

   wq = malloc(sizeof(workq_t));
   memset(wq, 0, sizeof(workq_t));

   if ((stat = pthread_mutex_init(&wq->mutex, NULL)) != 0) {
      return 1;
   }
   if ((stat = pthread_cond_init(&wq->work, NULL)) != 0) {
      pthread_mutex_destroy(&wq->mutex);
      return 1;
   }

   if ((stat = pthread_mutex_lock(&wq->mutex)) != 0) {
      return 1;
   }


   gettimeofday(&tv, &tz);
   to.tv_nsec = 0;
   to.tv_sec = tv.tv_sec + 10;

   stat = pthread_cond_timedwait(&wq->work, &wq->mutex, &to);
   if (stat == ETIMEDOUT) {
      printf("Timed out\n");
   } else if (stat != 0) {
      printf("pthread_cond_timedwait error.\n");
      pthread_mutex_unlock(&wq->mutex);
      return 1;
   }

   pthread_mutex_unlock(&wq->mutex);
   gettimeofday(&tv, &tz);
   to.tv_nsec = 0;
   to.tv_sec = tv.tv_sec + 10;

   stat = pthread_cond_timedwait(&wq->work, &wq->mutex, &to);
   if (stat == ETIMEDOUT) {
      printf("Second timedwait timed out\n");
   } else if (stat != 0) {
      printf("pthread_cond_timedwait error.\n");
      pthread_mutex_unlock(&wq->mutex);
      return 1;
   }
   return 0;
}


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