42 lines
980 B
C
42 lines
980 B
C
/* go-close.c -- the builtin close function.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "go-assert.h"
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#include "go-panic.h"
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#include "channel.h"
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/* Close a channel. After a channel is closed, sends are no longer
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permitted. Receives always return zero. */
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void
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__go_builtin_close (struct __go_channel *channel)
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{
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int i;
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i = pthread_mutex_lock (&channel->lock);
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__go_assert (i == 0);
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while (channel->selected_for_send)
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{
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i = pthread_cond_wait (&channel->cond, &channel->lock);
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__go_assert (i == 0);
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}
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if (channel->is_closed)
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{
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i = pthread_mutex_unlock (&channel->lock);
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__go_assert (i == 0);
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__go_panic_msg ("close of closed channel");
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}
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channel->is_closed = 1;
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i = pthread_cond_broadcast (&channel->cond);
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__go_assert (i == 0);
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__go_unlock_and_notify_selects (channel);
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}
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