regards,
alexander.
Sent by: pthreads-win32-owner at sources dot redhat dot com
To: pthreads-win32 at sources dot redhat dot com
cc:
Subject: pthread_mutex_timedlock problem
Hello All,
I'm working on an rw-mutex and found something like a dead lock when
testing timed lock functions.
To be sure, I wrote a simple test program, which hangs up, too.
after ~4 loops it's dead (on 1GHz P3, Win2k)
Here it is:
#include <windows.h>
#include <sys/timeb.h>
#include "lib/pthreads/pthread.h"
#define DELAY 200
#define _log(what) OutputDebugString( what )
pthread_mutex_t mut;
void * thread_proc_w( void * );
int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR
lpCmdLine, int nCmdShow )
{
int i;
pthread_t th_w[2];
pthread_mutexattr_t m;
pthread_mutexattr_init( &m );
pthread_mutexattr_settype( &m, PTHREAD_MUTEX_NORMAL );
//PTHREAD_MUTEX_RECURSIVE
pthread_mutex_init( &mut, &m );
pthread_mutexattr_destroy( &m );
for( i=0; i<2; i++ )
pthread_create( &th_w[i], NULL, thread_proc_w, (void *) i
);
while( 1 )
Sleep( 1000 );
return 0;
}
void * thread_proc_w( void * param )
{
timespec ts;
_timeb tb;
while( 1 ) {
Sleep( 100 );
while( 1 ) {
_ftime( &tb );
ts.tv_sec = DELAY/1000 + tb.time;
ts.tv_nsec = (DELAY%1000 + tb.millitm) * 1000000;
int ret = pthread_mutex_timedlock( &mut, &ts );
// this makes problems
if( ret == 0 )
break;
}
_log( param ? "\r\nL0" : "\r\nL1" ); //I'm alive
Sleep( 500 );
_log( param ? "u0" : "u1" ); //unlocking ...
pthread_mutex_unlock( &mut );
}
pthread_exit( 0 );
return 0;
}
-------------------------------
(values in Sleep() do matter - some values work fine)
After a few loops, the mutex 'mut' cannot be locked no more.
Does anyone have any idea what's wrong ?
Thanks,
Robo