1 /* go-rec-big.c -- receive something larger than 64 bits on a channel.
3 Copyright 2009 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
12 /* Returns true if a value was received, false if the channel is
16 __go_receive_big (struct __go_channel *channel, void *val, _Bool for_select)
18 uintptr_t element_size;
25 __go_select (0, 0, NULL, NULL);
28 element_size = channel->element_type->__size;
29 alloc_size = (element_size + sizeof (uint64_t) - 1) / sizeof (uint64_t);
31 if (!__go_receive_acquire (channel, for_select))
33 __builtin_memset (val, 0, element_size);
37 offset = channel->next_fetch * alloc_size;
38 __builtin_memcpy (val, &channel->data[offset], element_size);
40 __go_receive_release (channel);