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