merges r27789 from trunk into ruby_1_9_2.

--
* vm_core.c (rb_thread_struct): add a field for sigaltstack.

* thread_pthread.c (thread_start_func_1): initialize machine stack
  information.

* thread.c (thread_start_func_2): set sigaltstack for each sub thread.
  [ruby-core:24540] [ruby-core:30207]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@27840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index 39dfe55556..1843567693 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -63,6 +63,10 @@
 #define va_init_list(a,b) va_start(a)
 #endif
 
+#if defined(SIGSEGV) && defined(HAVE_SIGALTSTACK) && defined(SA_SIGINFO) && !defined(__NetBSD__)
+#define USE_SIGALTSTACK
+#endif
+
 /*****************/
 /* configuration */
 /*****************/
@@ -473,6 +477,9 @@ typedef struct rb_thread_struct
     /* misc */
     int method_missing_reason;
     int abort_on_exception;
+#ifdef USE_SIGALTSTACK
+    void *altstack;
+#endif
 } rb_thread_t;
 
 /* iseq.c */