From: cgf AT cygnus DOT com (Christopher Faylor)
Subject: Patch to alleviate wait function problems
15 Jul 1998 09:11:06 -0700
Message-ID: <199807151551.LAA01031.cygnus.cygwin32.developers@kramden.cygnus.com>
To: cygwin32-developers AT cygnus DOT com, sos AT prospect DOT com DOT ru

There is a problem with wait() and signals that has been noticed on
the mailing list from time to time.  Specifically, if you are in the
middle of a wait and have a SIGCHLD handler which performs a wait,
and then returns to the previous wait, the previous wait may block
forever.

The patch below should fix this.

Sergey, if you have the time, would you mind putting this patch into a
"coolview" release?  I'd be very interested in finding out if this solves
any problems (or breaks anything).

-Chris

Index: wait.cc
===================================================================
RCS file: /cvs/cvsfiles/devo/winsup/wait.cc,v
retrieving revision 1.36.2.1
diff -u -r1.36.2.1 wait.cc
--- wait.cc	1998/06/06 05:50:25	1.36.2.1
+++ wait.cc	1998/07/15 15:42:54
@@ -113,5 +113,6 @@
   w->status = -1;
   if (rc < 0)
     sigproc_printf("*** errno = %d\n", get_errno());
+  SetEvent (w->thread_ev);	// in case invoked recursively via a signal
   return rc;
 }