* thread.c (rb_thread_atfork_internal): reinitialize global lock

at fork to get rid of deadlock.  based on the patch from Hongli
  Lai in [ruby-core:26783].  [ruby-core:26361]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25843 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

thread_pthread.c

@@ -71,6 +71,8 @@ native_mutex_initialize(pthread_mutex_t *lock)
     }
 }
 
+#define native_mutex_reinitialize_atfork(lock) native_mutex_initialize(lock)
+
 static void
 native_mutex_destroy(pthread_mutex_t *lock)
 {

thread_win32.c

@@ -326,6 +326,8 @@ native_mutex_initialize(rb_thread_lock_t *lock)
 #endif
 }
 
+#define native_mutex_reinitialize_atfork(lock) (void)(lock)
+
 static void
 native_mutex_destroy(rb_thread_lock_t *lock)
 {