39 lines
1010 B
C
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;
|
|
}
|