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Message-ID:	<03cb01c0f529$7b826020$0200a8c0@lifelesswks>
From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	"Greg Smith" <rys AT epaibm DOT rtpnc DOT epa DOT gov>, <cygwin AT cygwin DOT com>
Cc:	<cygwin-patches AT cygwin DOT com>
References:	<3B290FE5 DOT 22678B61 AT trex DOT rtpnc DOT epa DOT gov>
Subject:	Re: hang in pthread_cond_signal
Date:	Fri, 15 Jun 2001 09:26:46 +1000
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----- Original Message -----
From: "Greg Smith" <rys AT epaibm DOT rtpnc DOT epa DOT gov>
To: <cygwin AT cygwin DOT com>
Sent: Friday, June 15, 2001 5:26 AM
Subject: hang in pthread_cond_signal


> I am using the cygwin-src snapshot from June 10.
>
> Seems pthread_cond_signal can hang while another thread
> is waiting on the condition AND a pthread_cond_signal
> has been previously issued when no one was waiting on the
> condition.  Below is a testcase that illustrates the
> problem:
>
> Thanks,
>
> Greg
>

Thanks for the testcase Greg. The attached patch fixes your testcase.

Rob

Changelog:


Fri June 15 09:25:00  Robert Collins <rbtcollins AT hotmail DOT com>

    * thread.cc (pthread_cond::Signal): Release the condition access
variable correctly.



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Index: thread.cc=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
RCS file: /cvs/src/src/winsup/cygwin/thread.cc,v=0A=
retrieving revision 1.33=0A=
diff -u -p -r1.33 thread.cc=0A=
--- thread.cc	2001/06/07 19:55:06	1.33=0A=
+++ thread.cc	2001/06/14 23:23:59=0A=
@@ -442,7 +442,12 @@ pthread_cond::Signal ()=0A=
   if (pthread_mutex_lock (&cond_access))=0A=
     system_printf ("Failed to lock condition variable access mutex, =
this %0p\n", this);=0A=
   if (!verifyable_object_isvalid (mutex, PTHREAD_MUTEX_MAGIC))=0A=
-    return;=0A=
+    {=0A=
+      if (pthread_mutex_unlock (&cond_access))=0A=
+        system_printf ("Failed to unlock condition variable access =
mutex, this %0p\n",=0A=
+                       this);=0A=
+      return;=0A=
+    }=0A=
   PulseEvent (win32_obj_id);=0A=
   if (pthread_mutex_unlock (&cond_access))=0A=
     system_printf ("Failed to unlock condition variable access mutex, =
this %0p\n", this);=0A=


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