* cont.c (rb_fiber_reset_root_local_storage): add a new function to

restore rb_thread_t::local_storage.

* cont.c (rb_obj_is_fiber): add a new function to tell finalizer to
  prevent fibers from destroy.

* gc.c (rb_objspace_call_finalizer): don't sweep fibers at finalizing
  objspace.

* internal.h (rb_fiber_reset_root_local_storage, rb_obj_is_fiber):
  add prototypes.

* vm.c (ruby_vm_destruct): reset main thread's local_storage before
  free main thread. rb_thread_t::local_storage is replaced by fiber's
  local storage when forked from fiber, and it should be already freed
  when the fiber was destroyed.

* test/ruby/test_fiber.rb (test_fork_from_fiber): add test for fork
  from fiber.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,25 @@
+Wed Feb 15 22:20:19 2012  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
+
+	* cont.c (rb_fiber_reset_root_local_storage): add a new function to
+	  restore rb_thread_t::local_storage.
+
+	* cont.c (rb_obj_is_fiber): add a new function to tell finalizer to
+	  prevent fibers from destroy.
+
+	* gc.c (rb_objspace_call_finalizer): don't sweep fibers at finalizing
+	  objspace.
+
+	* internal.h (rb_fiber_reset_root_local_storage, rb_obj_is_fiber):
+	  add prototypes.
+
+	* vm.c (ruby_vm_destruct): reset main thread's local_storage before
+	  free main thread. rb_thread_t::local_storage is replaced by fiber's
+	  local storage when forked from fiber, and it should be already freed
+	  when the fiber was destroyed.
+
+	* test/ruby/test_fiber.rb (test_fork_from_fiber): add test for fork
+	  from fiber.
+
 Wed Feb 15 19:57:02 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/fiddle/closure.c (callback): deal with unsigned integers.

cont.c

@@ -330,6 +330,17 @@ fiber_memsize(const void *ptr)
     return size;
 }
 
+VALUE
+rb_obj_is_fiber(VALUE obj)
+{
+    if (rb_typeddata_is_kind_of(obj, &fiber_data_type)) {
+	return Qtrue;
+    }
+    else {
+	return Qfalse;
+    }
+}
+
 static void
 cont_save_machine_stack(rb_thread_t *th, rb_context_t *cont)
 {
@@ -1347,6 +1358,19 @@ rb_fiber_yield(int argc, VALUE *argv)
     return rb_fiber_transfer(return_fiber(), argc, argv);
 }
 
+void
+rb_fiber_reset_root_local_storage(VALUE thval)
+{
+    rb_thread_t *th;
+    rb_fiber_t	*fib;
+
+    GetThreadPtr(thval, th);
+    if (th->root_fiber && th->root_fiber != th->fiber) {
+	GetFiberPtr(th->root_fiber, fib);
+	th->local_storage = fib->cont.saved_thread.local_storage;
+    }
+}
+
 /*
  *  call-seq:
  *     fiber.alive? -> true or false

gc.c

@@ -3247,7 +3247,8 @@ rb_objspace_call_finalizer(rb_objspace_t *objspace)
 	while (p < pend) {
 	    if (BUILTIN_TYPE(p) == T_DATA &&
 		DATA_PTR(p) && RANY(p)->as.data.dfree &&
-		!rb_obj_is_thread((VALUE)p) && !rb_obj_is_mutex((VALUE)p) ) {
+		!rb_obj_is_thread((VALUE)p) && !rb_obj_is_mutex((VALUE)p) &&
+		!rb_obj_is_fiber((VALUE)p)) {
 		p->as.free.flags = 0;
 		if (RTYPEDDATA_P(p)) {
 		    RDATA(p)->dfree = RANY(p)->as.typeddata.type->function.dfree;

internal.h

@@ -62,6 +62,10 @@ int rb_parse_in_eval(void);
 int rb_parse_in_main(void);
 VALUE rb_insns_name_array(void);
 
+/* cont.c */
+VALUE rb_obj_is_fiber(VALUE);
+void rb_fiber_reset_root_local_storage(VALUE);
+
 /* debug.c */
 PRINTF_ARGS(void ruby_debug_printf(const char*, ...), 1, 2);
 

test/ruby/test_fiber.rb

@@ -248,5 +248,21 @@ class TestFiber < Test::Unit::TestCase
       f.transfer
     }
   end
+
+  def test_fork_from_fiber
+    begin
+      Process.fork{}
+    rescue NotImplementedError
+      return
+    end
+    bug5700 = '[ruby-core:41456]'
+    pid = nil
+    assert_nothing_raised(bug5700) do
+      Fiber.new{ pid = fork {} }.resume
+    end
+    pid, status = Process.waitpid2(pid)
+    assert_equal(0, status.exitstatus, bug5700)
+    assert_equal(false, status.signaled?, bug5700)
+  end
 end
 

vm.c

@@ -1611,6 +1611,7 @@ ruby_vm_destruct(rb_vm_t *vm)
 	rb_gc_force_recycle(vm->self);
 	vm->main_thread = 0;
 	if (th) {
+	    rb_fiber_reset_root_local_storage(th->self);
 	    thread_free(th);
 	}
 	if (vm->living_threads) {