Date: Tue, 16 Sep 1997 06:25:35 -0700 (PDT) From: thz@tuebingen.netsurf.de To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/4554: pthread_cond_wait() doesn't wait for pthread_cond_signal() Message-ID: <199709161325.GAA23560@hub.freebsd.org> Resent-Message-ID: <199709161330.GAA23785@hub.freebsd.org>
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>Number: 4554
>Category: bin
>Synopsis: pthread_cond_wait() doesn't wait for pthread_cond_signal()
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Sep 16 06:30:00 PDT 1997
>Last-Modified:
>Originator: Thomas Zenker
>Organization:
Lennartz electronic
>Release: 2.2.1/2.2.2
>Environment:
>Description:
pthread_cond_wait returns immediately without
waiting for pthread_cond_signal by another thread.
the reason is that in pthread_cond_wait the wakeup_time.tv_sec
is not explicitely set to "wait forever" (-1).
Debugging shows: wakeup_time.tv_sec is allways implicitely
set to "wakeup immediately" (0).
>How-To-Repeat:
Calling pthread_cond_wait() never stops the current thread.
>Fix:
Set wakeup_time.tv_sec explicitely to wait forever in the function
pthread_cond_wait() in file "uthread_cond.c".
*** /vol/cdrom/usr/src/lib/libc_r/uthread/uthread_cond.c Fri Sep 20 08:3:50 1996
--- ./uthread_cond.c Tue Sep 16 12:54:56 1997
***************
*** 149,154 ****
--- 149,158 ----
switch ((*cond)->c_type) {
/* Fast condition variable: */
case COND_TYPE_FAST:
+ /* Set the wakeup time: wait forever */
+ _thread_run->wakeup_time.tv_sec = -1;
+ _thread_run->wakeup_time.tv_nsec = -1;
+
/* Queue the running thread for the condition variable:*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run
);
>Audit-Trail:
>Unformatted:
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