From 646abff51d38292367bce009d01087c404c4759b Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Tue, 14 Dec 2010 05:19:51 +0000
Subject: [PATCH] Better error message if malloc gets a SIGSEGV.

From-SVN: r167785
---
 libgo/runtime/go-signal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libgo/runtime/go-signal.c b/libgo/runtime/go-signal.c
index 8f44970402e..3838ab98871 100644
--- a/libgo/runtime/go-signal.c
+++ b/libgo/runtime/go-signal.c
@@ -133,6 +133,12 @@ sighandler (int sig)
     {
       sigset_t clear;
 
+      if (__sync_bool_compare_and_swap (&m->mallocing, 1, 1))
+	{
+	  fprintf (stderr, "caught signal while mallocing: %s\n", msg);
+	  __go_assert (0);
+	}
+
       /* The signal handler blocked signals; unblock them.  */
       i = sigfillset (&clear);
       __go_assert (i == 0);
-- 
2.30.2