github.com/c12o16h1/go/src@v0.0.0-20200114212001-5a151c0f00ed/runtime/internal/atomic/atomic_amd64.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package atomic
     6  
     7  import "unsafe"
     8  
     9  // Export some functions via linkname to assembly in sync/atomic.
    10  //go:linkname Load
    11  //go:linkname Loadp
    12  //go:linkname Load64
    13  
    14  //go:nosplit
    15  //go:noinline
    16  func Load(ptr *uint32) uint32 {
    17  	return *ptr
    18  }
    19  
    20  //go:nosplit
    21  //go:noinline
    22  func Loadp(ptr unsafe.Pointer) unsafe.Pointer {
    23  	return *(*unsafe.Pointer)(ptr)
    24  }
    25  
    26  //go:nosplit
    27  //go:noinline
    28  func Load64(ptr *uint64) uint64 {
    29  	return *ptr
    30  }
    31  
    32  //go:nosplit
    33  //go:noinline
    34  func LoadAcq(ptr *uint32) uint32 {
    35  	return *ptr
    36  }
    37  
    38  //go:noescape
    39  func Xadd(ptr *uint32, delta int32) uint32
    40  
    41  //go:noescape
    42  func Xadd64(ptr *uint64, delta int64) uint64
    43  
    44  //go:noescape
    45  func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
    46  
    47  //go:noescape
    48  func Xchg(ptr *uint32, new uint32) uint32
    49  
    50  //go:noescape
    51  func Xchg64(ptr *uint64, new uint64) uint64
    52  
    53  //go:noescape
    54  func Xchguintptr(ptr *uintptr, new uintptr) uintptr
    55  
    56  //go:nosplit
    57  //go:noinline
    58  func Load8(ptr *uint8) uint8 {
    59  	return *ptr
    60  }
    61  
    62  //go:noescape
    63  func And8(ptr *uint8, val uint8)
    64  
    65  //go:noescape
    66  func Or8(ptr *uint8, val uint8)
    67  
    68  // NOTE: Do not add atomicxor8 (XOR is not idempotent).
    69  
    70  //go:noescape
    71  func Cas64(ptr *uint64, old, new uint64) bool
    72  
    73  //go:noescape
    74  func CasRel(ptr *uint32, old, new uint32) bool
    75  
    76  //go:noescape
    77  func Store(ptr *uint32, val uint32)
    78  
    79  //go:noescape
    80  func Store8(ptr *uint8, val uint8)
    81  
    82  //go:noescape
    83  func Store64(ptr *uint64, val uint64)
    84  
    85  //go:noescape
    86  func StoreRel(ptr *uint32, val uint32)
    87  
    88  // StorepNoWB performs *ptr = val atomically and without a write
    89  // barrier.
    90  //
    91  // NO go:noescape annotation; see atomic_pointer.go.
    92  func StorepNoWB(ptr unsafe.Pointer, val unsafe.Pointer)