gcc/libgo/runtime/go-rec-nb-big.c
Ian Lance Taylor 8039ca76a5 Update to current version of Go library.
From-SVN: r171427
2011-03-24 23:46:17 +00:00

39 lines
1010 B
C

/* go-rec-nb-big.c -- nonblocking receive of something big on a channel.
Copyright 2009 The Go Authors. All rights reserved.
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file. */
#include <stdint.h>
#include "channel.h"
/* Return true if a value was received, false if not. */
_Bool
__go_receive_nonblocking_big (struct __go_channel* channel, void *val,
_Bool *closed)
{
size_t alloc_size;
size_t offset;
alloc_size = ((channel->element_size + sizeof (uint64_t) - 1)
/ sizeof (uint64_t));
int data = __go_receive_nonblocking_acquire (channel);
if (data != RECEIVE_NONBLOCKING_ACQUIRE_DATA)
{
__builtin_memset (val, 0, channel->element_size);
if (closed != NULL)
*closed = data == RECEIVE_NONBLOCKING_ACQUIRE_CLOSED;
return 0;
}
offset = channel->next_fetch * alloc_size;
__builtin_memcpy (val, &channel->data[offset], channel->element_size);
__go_receive_release (channel);
return 1;
}