blob: 7828c66c98693dcc94c2247abc5e5da46994c7a7 [file] [log] [blame]
// 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.
package runtime
import "unsafe"
// The calls to nop are to keep these functions from being inlined.
// If they are inlined we have no guarantee that later rewrites of the
// code by optimizers will preserve the relative order of memory accesses.
//go:nosplit
func atomicload(ptr *uint32) uint32 {
nop()
return *ptr
}
//go:nosplit
func atomicloadp(ptr unsafe.Pointer) unsafe.Pointer {
nop()
return *(*unsafe.Pointer)(ptr)
}
//go:nosplit
func xadd64(ptr *uint64, delta int64) uint64 {
for {
old := *ptr
if cas64(ptr, old, old+uint64(delta)) {
return old + uint64(delta)
}
}
}
//go:nosplit
func xchg64(ptr *uint64, new uint64) uint64 {
for {
old := *ptr
if cas64(ptr, old, new) {
return old
}
}
}
//go:noescape
func xadd(ptr *uint32, delta int32) uint32
//go:noescape
func xchg(ptr *uint32, new uint32) uint32
// NO go:noescape annotation; see atomic_pointer.go.
func xchgp1(ptr unsafe.Pointer, new unsafe.Pointer) unsafe.Pointer
//go:noescape
func xchguintptr(ptr *uintptr, new uintptr) uintptr
//go:noescape
func atomicload64(ptr *uint64) uint64
//go:noescape
func atomicand8(ptr *uint8, val uint8)
//go:noescape
func atomicor8(ptr *uint8, val uint8)
// NOTE: Do not add atomicxor8 (XOR is not idempotent).
//go:noescape
func cas64(ptr *uint64, old, new uint64) bool
//go:noescape
func atomicstore(ptr *uint32, val uint32)
//go:noescape
func atomicstore64(ptr *uint64, val uint64)
// NO go:noescape annotation; see atomic_pointer.go.
func atomicstorep1(ptr unsafe.Pointer, val unsafe.Pointer)