1 files changed, 33 insertions, 0 deletions
diff --git a/libgo/runtime/go-close.c b/libgo/runtime/go-close.c
new file mode 100644
index 000000000..ced742985
--- /dev/null
+++ b/libgo/runtime/go-close.c
@@ -0,0 +1,33 @@
+/* go-close.c -- the builtin close function.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include "go-assert.h"
+#include "channel.h"
+
+/* Close a channel.  After a channel is closed, sends are no longer
+   permitted.  Receives always return zero.  */
+
+void
+__go_builtin_close (struct __go_channel *channel)
+{
+  int i;
+
+  i = pthread_mutex_lock (&channel->lock);
+  __go_assert (i == 0);
+
+  while (channel->selected_for_send)
+    {
+      i = pthread_cond_wait (&channel->cond, &channel->lock);
+      __go_assert (i == 0);
+    }
+
+  channel->is_closed = 1;
+
+  i = pthread_cond_broadcast (&channel->cond);
+  __go_assert (i == 0);
+
+  __go_unlock_and_notify_selects (channel);
+}