libgo/runtime/go-close.c

   1 /* go-close.c -- the builtin close function.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "go-assert.h"
   8 #include "channel.h"
   9
  10 /* Close a channel.  After a channel is closed, sends are no longer
  11    permitted.  Receives always return zero.  */
  12
  13 void
  14 __go_builtin_close (struct __go_channel *channel)
  15 {
  16   int i;
  17
  18   i = pthread_mutex_lock (&channel->lock);
  19   __go_assert (i == 0);
  20
  21   while (channel->selected_for_send)
  22     {
  23       i = pthread_cond_wait (&channel->cond, &channel->lock);
  24       __go_assert (i == 0);
  25     }
  26
  27   channel->is_closed = 1;
  28
  29   i = pthread_cond_broadcast (&channel->cond);
  30   __go_assert (i == 0);
  31
  32   __go_unlock_and_notify_selects (channel);
  33 }