From f95778e7ac31c5c29d7a5b7a2b3114b3cabd7e1e Mon Sep 17 00:00:00 2001
From: Chris Hanson <org/chris-hanson/cph>
Date: Wed, 10 May 1995 21:19:49 +0000
Subject: [PATCH] Patch to work around sporadic error code in
 DosRequestMutexSem.

---
 v7/src/microcode/os2.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/v7/src/microcode/os2.c b/v7/src/microcode/os2.c
index 77ad2028a..d6c6adf96 100644
--- a/v7/src/microcode/os2.c
+++ b/v7/src/microcode/os2.c
@@ -1,6 +1,6 @@
 /* -*-C-*-
 
-$Id: os2.c,v 1.4 1995/04/28 07:04:53 cph Exp $
+$Id: os2.c,v 1.5 1995/05/10 21:19:49 cph Exp $
 
 Copyright (c) 1994-95 Massachusetts Institute of Technology
 
@@ -201,7 +201,17 @@ OS2_close_mutex_semaphore (HMTX s)
 void
 OS2_request_mutex_semaphore (HMTX s)
 {
-  STD_API_CALL (dos_request_mutex_sem, (s, SEM_INDEFINITE_WAIT));
+  XTD_API_CALL (dos_request_mutex_sem, (s, SEM_INDEFINITE_WAIT),
+		{
+		  /* This return code has been sporadically occurring
+		     on my machine.  On a recent occurrence, I
+		     proceeded past the error in the debugger, and the
+		     program continued working without errors.  IBM
+		     tech support is mystified because this code
+		     appears nowhere in their sources.  */
+		  if (rc == 3000)
+		    return;
+		});
 }
 
 void
-- 
2.25.1