github.com/geraldss/go/src@v0.0.0-20210511222824-ac7d0ebfc235/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:nosplit
    39  //go:noinline
    40  func LoadAcq64(ptr *uint64) uint64 {
    41  	return *ptr
    42  }
    43  
    44  //go:nosplit
    45  //go:noinline
    46  func LoadAcquintptr(ptr *uintptr) uintptr {
    47  	return *ptr
    48  }
    49  
    50  //go:noescape
    51  func Xadd(ptr *uint32, delta int32) uint32
    52  
    53  //go:noescape
    54  func Xadd64(ptr *uint64, delta int64) uint64
    55  
    56  //go:noescape
    57  func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
    58  
    59  //go:noescape
    60  func Xchg(ptr *uint32, new uint32) uint32
    61  
    62  //go:noescape
    63  func Xchg64(ptr *uint64, new uint64) uint64
    64  
    65  //go:noescape
    66  func Xchguintptr(ptr *uintptr, new uintptr) uintptr
    67  
    68  //go:nosplit
    69  //go:noinline
    70  func Load8(ptr *uint8) uint8 {
    71  	return *ptr
    72  }
    73  
    74  //go:noescape
    75  func And8(ptr *uint8, val uint8)
    76  
    77  //go:noescape
    78  func Or8(ptr *uint8, val uint8)
    79  
    80  //go:noescape
    81  func And(ptr *uint32, val uint32)
    82  
    83  //go:noescape
    84  func Or(ptr *uint32, val uint32)
    85  
    86  // NOTE: Do not add atomicxor8 (XOR is not idempotent).
    87  
    88  //go:noescape
    89  func Cas64(ptr *uint64, old, new uint64) bool
    90  
    91  //go:noescape
    92  func CasRel(ptr *uint32, old, new uint32) bool
    93  
    94  //go:noescape
    95  func Store(ptr *uint32, val uint32)
    96  
    97  //go:noescape
    98  func Store8(ptr *uint8, val uint8)
    99  
   100  //go:noescape
   101  func Store64(ptr *uint64, val uint64)
   102  
   103  //go:noescape
   104  func StoreRel(ptr *uint32, val uint32)
   105  
   106  //go:noescape
   107  func StoreRel64(ptr *uint64, val uint64)
   108  
   109  //go:noescape
   110  func StoreReluintptr(ptr *uintptr, val uintptr)
   111  
   112  // StorepNoWB performs *ptr = val atomically and without a write
   113  // barrier.
   114  //
   115  // NO go:noescape annotation; see atomic_pointer.go.
   116  func StorepNoWB(ptr unsafe.Pointer, val unsafe.Pointer)