>Number:         24926
>Category:       port-amd64
>Synopsis:       pthread problem
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 26 17:25:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     Krister Walfridsson
>Release:        NetBSD 1.6ZL (Compiled from Mar 26 source.)
>Organization:
	
>Environment:
	
	
System: NetBSD amd64.kwa 1.6ZL NetBSD 1.6ZL (GENERIC) #0: Fri Mar 26 14:03:58 CET 2004 cato@amd64.kwa:/home/cato/nbsd040326/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
>Description:
The configure script for the package mail/milter-greylist hangs on amd64
when it is "checking for broken rwlock in libpthread".
>How-To-Repeat:
Compile the test program below with

  gcc bug.c -pthread

and notice that running

  ./a.out

never returns.


#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>

pthread_rwlock_t lock;

void testfunc();
void yeild(void);

void yield (void)
{
        struct timeval tv;

        tv.tv_sec = 1;
        tv.tv_usec = 0;
        if (select(0, NULL, NULL, NULL, &tv) != 0)
                exit(EXIT_FAILURE);
}

void testfunc (dontcare) void *dontcare;
{
        if (pthread_rwlock_rdlock(&lock) != 0)
                exit(EXIT_FAILURE);
        yield();
        if (pthread_rwlock_unlock(&lock) != 0)
                exit(EXIT_FAILURE);
}

int
main ()
{
        pthread_t tid;

        if (pthread_rwlock_init(&lock, NULL) != 0)
                exit(EXIT_FAILURE);
        if (pthread_create(&tid, NULL, (void *)testfunc, NULL) != 0)
                exit(EXIT_FAILURE);
        if (pthread_rwlock_rdlock(&lock) != 0)
                exit(EXIT_FAILURE);
        yield();
        if (pthread_rwlock_unlock(&lock) != 0)
                exit(EXIT_FAILURE);
        if (pthread_join(tid, NULL) != 0)
                exit(EXIT_FAILURE);
        return 0;
}

>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: