mirror of
https://github.com/golang/go
synced 2024-11-20 01:14:40 -07:00
d497eeb005
I noticed that they were unimplemented on arm64 but then that they were in fact not used at all. Change-Id: Iee579feda2a5e374fa571bcc8c89e4ef607d50f6 Reviewed-on: https://go-review.googlesource.com/13951 Run-TryBot: Minux Ma <minux@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
// 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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package runtime
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import "unsafe"
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// The calls to nop are to keep these functions from being inlined.
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// If they are inlined we have no guarantee that later rewrites of the
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// code by optimizers will preserve the relative order of memory accesses.
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//go:nosplit
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func atomicload(ptr *uint32) uint32 {
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nop()
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return *ptr
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}
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//go:nosplit
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func atomicloadp(ptr unsafe.Pointer) unsafe.Pointer {
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nop()
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return *(*unsafe.Pointer)(ptr)
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}
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//go:nosplit
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func xadd64(ptr *uint64, delta int64) uint64 {
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for {
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old := *ptr
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if cas64(ptr, old, old+uint64(delta)) {
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return old + uint64(delta)
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}
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}
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}
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//go:noescape
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//go:linkname xadduintptr runtime.xadd
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func xadduintptr(ptr *uintptr, delta uintptr) uintptr
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//go:nosplit
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func xchg64(ptr *uint64, new uint64) uint64 {
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for {
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old := *ptr
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if cas64(ptr, old, new) {
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return old
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}
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}
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}
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//go:noescape
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func xadd(ptr *uint32, delta int32) uint32
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//go:noescape
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func xchg(ptr *uint32, new uint32) uint32
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//go:noescape
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func xchguintptr(ptr *uintptr, new uintptr) uintptr
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//go:noescape
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func atomicload64(ptr *uint64) uint64
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//go:noescape
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func atomicand8(ptr *uint8, val uint8)
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//go:noescape
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func atomicor8(ptr *uint8, val uint8)
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// NOTE: Do not add atomicxor8 (XOR is not idempotent).
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//go:noescape
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func cas64(ptr *uint64, old, new uint64) bool
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//go:noescape
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func atomicstore(ptr *uint32, val uint32)
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//go:noescape
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func atomicstore64(ptr *uint64, val uint64)
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// NO go:noescape annotation; see atomic_pointer.go.
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func atomicstorep1(ptr unsafe.Pointer, val unsafe.Pointer)
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