1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
// 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
// xchgp cannot have a go:noescape annotation, because
// while ptr does not escape, new does. If new is marked as
// not escaping, the compiler will make incorrect escape analysis
// decisions about the value being xchg'ed.
// Instead, make xchgp a wrapper around the actual atomic.
// When calling the wrapper we mark ptr as noescape explicitly.
//go:nosplit
func xchgp(ptr unsafe.Pointer, new unsafe.Pointer) unsafe.Pointer {
return xchgp1(noescape(ptr), new)
}
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 atomicor8(ptr *uint8, val uint8)
//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)
// atomicstorep cannot have a go:noescape annotation.
// See comment above for xchgp.
//go:nosplit
func atomicstorep(ptr unsafe.Pointer, new unsafe.Pointer) {
atomicstorep1(noescape(ptr), new)
}
func atomicstorep1(ptr unsafe.Pointer, val unsafe.Pointer)
|
