* signal.c (rb_sigaltstack_size): new. calculate stack size for

  sigsegv handler. enlarge value when x86 or x86_64 on Linux.
  Linux has very small MINSIGSTKSZ size (2048 bytes) and
  our sigsegv routine need 5KiB at least. [Bug #7141]
* internal.h: add declaration of rb_sigaltstack_size().
* vm_core.h: remove ALT_STACK_SIZE definition.

* signal.c (rb_register_sigaltstack): replace ALT_STACK_SIZE with
  rb_sigaltstack_size();
* gc.c (Init_heap): ditto.
* vm.c (th_init): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38409 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index da15fd2675..2266754fc7 100644
--- a/vm.c
+++ b/vm.c
@@ -1834,7 +1834,7 @@ th_init(rb_thread_t *th, VALUE self)
     /* allocate thread stack */
 #ifdef USE_SIGALTSTACK
     /* altstack of main thread is reallocated in another place */
-    th->altstack = malloc(ALT_STACK_SIZE);
+    th->altstack = malloc(rb_sigaltstack_size());
 #endif
     th->stack_size = RUBY_VM_THREAD_STACK_SIZE;
     th->stack = thread_recycle_stack(th->stack_size);