Better error message if malloc gets a SIGSEGV.

From-SVN: r167785

Better error message if malloc gets a SIGSEGV.
From-SVN: r167785
646abff5 · Ian Lance Taylor · cac7efc9 · 646abff5
Commit 646abff5 authored Dec 14, 2010 by Ian Lance Taylor
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libgo/runtime/go-signal.c
+6 -0

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--- 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);