merge revision(s) 32749:

	* vm.c (th_init): preallocate alternative stack.
	  NoMemoryError is better than rb_bug, of course.
	  Patch by Eric Wong. [ruby-core:38572][ruby-core:38594].

	* signal.c (rb_register_sigaltstack): ditto.

	* vm_core.h: moved ALT_STACK_SIZE definition from signal.c.

	* vm.c (thread_free): use xfree() instead of free().


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32750 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index 678a515bdf..b5433f9094 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -383,6 +383,12 @@ struct rb_unblock_callback {
 
 struct rb_mutex_struct;
 
+#ifdef SIGSTKSZ
+#define ALT_STACK_SIZE (SIGSTKSZ*2)
+#else
+#define ALT_STACK_SIZE (4*1024)
+#endif
+
 typedef struct rb_thread_struct {
     VALUE self;
     rb_vm_t *vm;