44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/* go-rec-big.c -- receive something larger than 64 bits on a channel.
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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 <stdint.h>
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#include "go-panic.h"
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#include "channel.h"
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/* Returns true if a value was received, false if the channel is
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closed. */
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_Bool
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__go_receive_big (struct __go_channel *channel, void *val, _Bool for_select)
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{
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uintptr_t element_size;
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size_t alloc_size;
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size_t offset;
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if (channel == NULL)
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{
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/* Block forever. */
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__go_select (0, 0, NULL, NULL);
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}
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element_size = channel->element_type->__size;
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alloc_size = (element_size + sizeof (uint64_t) - 1) / sizeof (uint64_t);
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if (!__go_receive_acquire (channel, for_select))
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{
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__builtin_memset (val, 0, element_size);
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return 0;
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}
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offset = channel->next_fetch * alloc_size;
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__builtin_memcpy (val, &channel->data[offset], element_size);
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__go_receive_release (channel);
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return 1;
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}
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