From d8d91485063d2c6e1a54d0f2d53d418ad748a8d2 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 20 Jul 2015 00:11:40 +0000
Subject: thread.c: reuse tag

* thread.c (rb_thread_terminate_all): reuse the tag pushed before
  a loop, instead of pushing/popping same tag repeatedly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51301 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 thread.c | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/thread.c b/thread.c
index 46976e5992..65e52a6529 100644
--- a/thread.c
+++ b/thread.c
@@ -179,6 +179,12 @@ vm_check_ints_blocking(rb_thread_t *th)
     rb_threadptr_execute_interrupts(th, 1);
 }
 
+static int
+vm_living_thread_num(rb_vm_t *vm)
+{
+    return (int)vm->living_thread_num;
+}
+
 #if THREAD_DEBUG
 #ifdef HAVE_VA_ARGS_MACRO
 void rb_thread_debug(const char *file, int line, const char *fmt, ...);
@@ -479,6 +485,7 @@ rb_thread_terminate_all(void)
 {
     rb_thread_t *th = GET_THREAD(); /* main thread */
     rb_vm_t *vm = th->vm;
+    volatile int sleeping = 0;
 
     if (vm->main_thread != th) {
 	rb_bug("rb_thread_terminate_all: called by child thread (%p, %p)",
@@ -488,33 +495,35 @@ rb_thread_terminate_all(void)
     /* unlock all locking mutexes */
     rb_threadptr_unlock_all_locking_mutexes(th);
 
-  retry:
-    thread_debug("rb_thread_terminate_all (main thread: %p)\n", (void *)th);
-    terminate_all(vm, th);
-
-    while (!rb_thread_alone()) {
-	int state;
+    TH_PUSH_TAG(th);
+    if (TH_EXEC_TAG() == 0) {
+      retry:
+	thread_debug("rb_thread_terminate_all (main thread: %p)\n", (void *)th);
+	terminate_all(vm, th);
 
-	TH_PUSH_TAG(th);
-	if ((state = TH_EXEC_TAG()) == 0) {
+	while (vm_living_thread_num(vm) > 1) {
 	    /*
 	     * Thread exiting routine in thread_start_func_2 notify
 	     * me when the last sub-thread exit.
 	     */
+	    sleeping = 1;
 	    native_sleep(th, 0);
 	    RUBY_VM_CHECK_INTS_BLOCKING(th);
+	    sleeping = 0;
 	}
-	TH_POP_TAG();
-
+    }
+    else {
 	/*
 	 * When caught an exception (e.g. Ctrl+C), let's broadcast
 	 * kill request again to ensure killing all threads even
 	 * if they are blocked on sleep, mutex, etc.
 	 */
-	if (state) {
+	if (sleeping) {
+	    sleeping = 0;
 	    goto retry;
 	}
     }
+    TH_POP_TAG();
 }
 
 static void
@@ -3054,12 +3063,6 @@ thread_keys_i(ID key, VALUE value, VALUE ary)
     return ST_CONTINUE;
 }
 
-static int
-vm_living_thread_num(rb_vm_t *vm)
-{
-    return (int)vm->living_thread_num;
-}
-
 int
 rb_thread_alone(void)
 {
-- 
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