From c264a24a38188a2f8bd3e7a591490bb2cfddea26 Mon Sep 17 00:00:00 2001
From: Peter Stephenson <pws@users.sourceforge.net>
Date: Fri, 7 Dec 2007 14:07:50 +0000
Subject: unposted: add explanatory comment for blocking around fork()

---
 Src/exec.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Src')

diff --git a/Src/exec.c b/Src/exec.c
index 9695011e3..3c13da476 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -239,6 +239,12 @@ zfork(struct timeval *tv)
     }
     if (tv)
 	gettimeofday(tv, &dummy_tz);
+    /*
+     * Queueing signals is necessary on Linux because fork()
+     * manipulates mutexes, leading to deadlock in memory
+     * allocation.  We don't expect fork() to be particularly
+     * zippy anyway.
+     */
     queue_signals();
     pid = fork();
     unqueue_signals();
-- 
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