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, 4 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index d945fba0d7..3c1e8b4113 100644
--- a/vm.c
+++ b/vm.c
@@ -1754,7 +1754,7 @@ thread_free(void *ptr)
 	else {
 #ifdef USE_SIGALTSTACK
 	    if (th->altstack) {
-		free(th->altstack);
+		xfree(th->altstack);
 	    }
 #endif
 	    ruby_xfree(ptr);
@@ -1826,6 +1826,9 @@ th_init(rb_thread_t *th, VALUE self)
     th->self = self;
 
     /* allocate thread stack */
+#ifdef USE_SIGALTSTACK
+    th->altstack = xmalloc(ALT_STACK_SIZE);
+#endif
     th->stack_size = RUBY_VM_THREAD_STACK_SIZE;
     th->stack = thread_recycle_stack(th->stack_size);