mirror of
https://github.com/golang/go
synced 2024-10-04 22:21:22 -06:00
add3349867
It will be handy for network poller. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/7429048
46 lines
719 B
C
46 lines
719 B
C
// Copyright 2009 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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#include "runtime.h"
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#pragma textflag 7
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uint32
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runtime·atomicload(uint32 volatile* addr)
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{
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return *addr;
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}
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#pragma textflag 7
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void*
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runtime·atomicloadp(void* volatile* addr)
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{
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return *addr;
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}
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#pragma textflag 7
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uint64
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runtime·xadd64(uint64 volatile* addr, int64 v)
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{
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uint64 old;
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old = *addr;
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while(!runtime·cas64(addr, &old, old+v)) {
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// nothing
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}
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return old+v;
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}
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#pragma textflag 7
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uint64
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runtime·xchg64(uint64 volatile* addr, uint64 v)
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{
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uint64 old;
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old = *addr;
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while(!runtime·cas64(addr, &old, v)) {
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// nothing
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}
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return old;
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}
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