* thread.c (terminate_atfork_i): all mutex locks by other threads

  have been abandoned at fork.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25841 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 23 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 552a35030c..bfef35165c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Nov 18 17:48:22 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread.c (terminate_atfork_i): all mutex locks by other threads
+	  have been abandoned at fork.
+
 Wed Nov 18 15:27:20 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* file.c (file_path_convert): delay getting filesystem encoding
diff --git a/thread.c b/thread.c
index 5ea1982378..5caf1da4ff 100644
--- a/thread.c
+++ b/thread.c
@@ -323,6 +323,7 @@ typedef struct rb_mutex_struct
 } mutex_t;
 
 static void rb_mutex_unlock_all(mutex_t *mutex, rb_thread_t *th);
+static void rb_mutex_abandon_all(mutex_t *mutexes);
 
 void
 rb_thread_terminate_all(void)
@@ -2724,6 +2725,10 @@ terminate_atfork_i(st_data_t key, st_data_t val, st_data_t current_th)
     GetThreadPtr(thval, th);
 
     if (th != (rb_thread_t *)current_th) {
+	if (th->keeping_mutexes) {
+	    rb_mutex_abandon_all(th->keeping_mutexes);
+	}
+	th->keeping_mutexes = NULL;
 	thread_cleanup_func(th);
     }
     return ST_CONTINUE;
@@ -3285,6 +3290,19 @@ rb_mutex_unlock_all(mutex_t *mutexes, rb_thread_t *th)
     }
 }
 
+static void
+rb_mutex_abandon_all(mutex_t *mutexes)
+{
+    mutex_t *mutex;
+
+    while (mutexes) {
+	mutex = mutexes;
+	mutexes = mutex->next_mutex;
+	mutex->th = 0;
+	mutex->next_mutex = 0;
+    }
+}
+
 static VALUE
 rb_mutex_sleep_forever(VALUE time)
 {