thread.c: clear atfork functions

* thread.c (rb_thread_atfork, rb_thread_atfork_before_exec): do
  nothing unless working fork is available.
* thread_sync.c (rb_mutex_abandon_all): define only if working
  fork is available.
* thread_sync.c (rb_mutex_abandon_keeping_mutexes): ditto.
* thread_sync.c (rb_mutex_abandon_locking_mutex): ditto.
* thread_win32.c (gvl_init): never used.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54960 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,17 @@
+Mon May  9 10:46:36 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread.c (rb_thread_atfork, rb_thread_atfork_before_exec): do
+	  nothing unless working fork is available.
+
+	* thread_sync.c (rb_mutex_abandon_all): define only if working
+	  fork is available.
+
+	* thread_sync.c (rb_mutex_abandon_keeping_mutexes): ditto.
+
+	* thread_sync.c (rb_mutex_abandon_locking_mutex): ditto.
+
+	* thread_win32.c (gvl_init): never used.
+
 Mon May  9 07:18:06 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* include/ruby/{defines,ruby}.h: need to define function attributes

thread.c

@@ -3917,6 +3917,7 @@ rb_thread_start_timer_thread(void)
     rb_thread_create_timer_thread();
 }
 
+#if defined(HAVE_WORKING_FORK)
 static int
 clear_coverage_i(st_data_t key, st_data_t val, st_data_t dummy)
 {
@@ -3992,6 +3993,17 @@ rb_thread_atfork_before_exec(void)
 {
     rb_thread_atfork_internal(terminate_atfork_before_exec_i);
 }
+#else
+void
+rb_thread_atfork(void)
+{
+}
+
+void
+rb_thread_atfork_before_exec(void)
+{
+}
+#endif
 
 struct thgroup {
     int enclosed;

thread_sync.c

@@ -14,9 +14,11 @@ typedef struct rb_mutex_struct {
     int allow_trap;
 } rb_mutex_t;
 
+#if defined(HAVE_WORKING_FORK)
 static void rb_mutex_abandon_all(rb_mutex_t *mutexes);
 static void rb_mutex_abandon_keeping_mutexes(rb_thread_t *th);
 static void rb_mutex_abandon_locking_mutex(rb_thread_t *th);
+#endif
 static const char* rb_mutex_unlock_th(rb_mutex_t *mutex, rb_thread_t volatile *th);
 
 /*
@@ -378,6 +380,7 @@ rb_mutex_unlock(VALUE self)
     return self;
 }
 
+#if defined(HAVE_WORKING_FORK)
 static void
 rb_mutex_abandon_keeping_mutexes(rb_thread_t *th)
 {
@@ -412,6 +415,7 @@ rb_mutex_abandon_all(rb_mutex_t *mutexes)
 	mutex->next_mutex = 0;
     }
 }
+#endif
 
 static VALUE
 rb_mutex_sleep_forever(VALUE time)

thread_win32.c

@@ -113,13 +113,6 @@ gvl_yield(rb_vm_t *vm, rb_thread_t *th)
   gvl_acquire(vm, th);
 }
 
-
-static void
-gvl_atfork(rb_vm_t *vm)
-{
-    rb_bug("gvl_atfork() is called on win32");
-}
-
 static void
 gvl_init(rb_vm_t *vm)
 {