40 lines
890 B
Plaintext
40 lines
890 B
Plaintext
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// Copyright 2010 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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package runtime
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#include "config.h"
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#include "channel.h"
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typedef _Bool bool;
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typedef unsigned char byte;
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typedef struct __go_channel chan;
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/* Do a nonblocking channel receive. */
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func chanrecv2(c *chan, val *byte) (pres bool) {
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if (c->element_size > 8) {
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return __go_receive_nonblocking_big(c, val);
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} else {
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struct __go_receive_nonblocking_small rs;
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union {
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char b[8];
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uint64_t v;
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} u;
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rs = __go_receive_nonblocking_small (c);
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if (!rs.__success) {
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__builtin_memset(val, 0, c->element_size);
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return 0;
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}
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u.v = rs.__val;
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#ifndef WORDS_BIGENDIAN
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__builtin_memcpy(val, u.b, c->element_size);
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#else
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__builtin_memcpy(val, u.b + 8 - c->element_size,
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c->element_size);
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#endif
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return 1;
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}
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}
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