merge revision(s) 42906: [Backport #8891]

* thread.c (rb_mutex_unlock): Mutex#unlock no longer raise
	  an exception even if uses on trap. [Bug #8891]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42926 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Sep 13 01:44:54 2013  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* thread.c (rb_mutex_unlock): Mutex#unlock no longer raise
+	  an exception even if uses on trap. [Bug #8891]
+
 Fri Sep 13 01:09:59 2013  Shota Fukumori  <sorah@tubusu.net>
 
 	* vm_backtrace.c (vm_backtrace_to_ary): Ignore the second argument if

test/ruby/test_thread.rb

@@ -877,6 +877,23 @@ Thread.new(Thread.current) {|mth|
     end
   end
 
+  def test_mutex_unlock_on_trap
+    assert_in_out_err([], <<-INPUT, %w(locked unlocked false), [])
+      m = Mutex.new
+
+      Signal.trap("INT") { |signo|
+        m.unlock
+        puts "unlocked"
+      }
+
+      m.lock
+      puts "locked"
+      Process.kill("INT", $$)
+      sleep 0.01
+      puts m.locked?
+    INPUT
+  end
+
   def invoke_rec script, vm_stack_size, machine_stack_size, use_length = true
     env = {}
     env['RUBY_THREAD_VM_STACK_SIZE'] = vm_stack_size.to_s if vm_stack_size

thread.c

@@ -4425,11 +4425,6 @@ rb_mutex_unlock(VALUE self)
     rb_mutex_t *mutex;
     GetMutexPtr(self, mutex);
 
-    /* When running trap handler */
-    if (!mutex->allow_trap && GET_THREAD()->interrupt_mask & TRAP_INTERRUPT_MASK) {
-	rb_raise(rb_eThreadError, "can't be called from trap context");
-    }
-
     err = rb_mutex_unlock_th(mutex, GET_THREAD());
     if (err) rb_raise(rb_eThreadError, "%s", err);
 

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2013-09-13"
-#define RUBY_PATCHLEVEL 308
+#define RUBY_PATCHLEVEL 309
 
 #define RUBY_RELEASE_YEAR 2013
 #define RUBY_RELEASE_MONTH 9