35 lines
794 B
C
35 lines
794 B
C
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/* go-closed.c -- the builtin closed 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 "channel.h"
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/* Return whether a channel is closed. We only return true after at
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least one nil value has been read from the channel. */
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_Bool
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__go_builtin_closed (struct __go_channel *channel)
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{
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int i;
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_Bool ret;
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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_receive)
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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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ret = channel->saw_close;
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i = pthread_mutex_unlock (&channel->lock);
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__go_assert (i == 0);
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return ret;
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}
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