Better error message if malloc gets a SIGSEGV.

From-SVN: r167785

diff --git a/libgo/runtime/go-signal.c b/libgo/runtime/go-signal.c
index 8f44970402e8efaa9a5c1888411f5c68d4e70b80..3838ab98871ca3592d0723dd5acc86f5c5ca4f98 100644 (file)
--- 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);