github.com/zxy12/go_duplicate_112_new@v0.0.0-20200807091221-747231827200/src/runtime/internal/atomic/atomic_wasm.go (about)

     1  // Copyright 2018 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  // TODO(neelance): implement with actual atomic operations as soon as threads are available
     6  // See https://github.com/WebAssembly/design/issues/1073
     7  
     8  package atomic
     9  
    10  import "unsafe"
    11  
    12  //go:nosplit
    13  //go:noinline
    14  func Load(ptr *uint32) uint32 {
    15  	return *ptr
    16  }
    17  
    18  //go:nosplit
    19  //go:noinline
    20  func Loadp(ptr unsafe.Pointer) unsafe.Pointer {
    21  	return *(*unsafe.Pointer)(ptr)
    22  }
    23  
    24  //go:nosplit
    25  //go:noinline
    26  func LoadAcq(ptr *uint32) uint32 {
    27  	return *ptr
    28  }
    29  
    30  //go:nosplit
    31  //go:noinline
    32  func Load64(ptr *uint64) uint64 {
    33  	return *ptr
    34  }
    35  
    36  //go:nosplit
    37  //go:noinline
    38  func Xadd(ptr *uint32, delta int32) uint32 {
    39  	new := *ptr + uint32(delta)
    40  	*ptr = new
    41  	return new
    42  }
    43  
    44  //go:nosplit
    45  //go:noinline
    46  func Xadd64(ptr *uint64, delta int64) uint64 {
    47  	new := *ptr + uint64(delta)
    48  	*ptr = new
    49  	return new
    50  }
    51  
    52  //go:nosplit
    53  //go:noinline
    54  func Xadduintptr(ptr *uintptr, delta uintptr) uintptr {
    55  	new := *ptr + delta
    56  	*ptr = new
    57  	return new
    58  }
    59  
    60  //go:nosplit
    61  //go:noinline
    62  func Xchg(ptr *uint32, new uint32) uint32 {
    63  	old := *ptr
    64  	*ptr = new
    65  	return old
    66  }
    67  
    68  //go:nosplit
    69  //go:noinline
    70  func Xchg64(ptr *uint64, new uint64) uint64 {
    71  	old := *ptr
    72  	*ptr = new
    73  	return old
    74  }
    75  
    76  //go:nosplit
    77  //go:noinline
    78  func Xchguintptr(ptr *uintptr, new uintptr) uintptr {
    79  	old := *ptr
    80  	*ptr = new
    81  	return old
    82  }
    83  
    84  //go:nosplit
    85  //go:noinline
    86  func And8(ptr *uint8, val uint8) {
    87  	*ptr = *ptr & val
    88  }
    89  
    90  //go:nosplit
    91  //go:noinline
    92  func Or8(ptr *uint8, val uint8) {
    93  	*ptr = *ptr | val
    94  }
    95  
    96  // NOTE: Do not add atomicxor8 (XOR is not idempotent).
    97  
    98  //go:nosplit
    99  //go:noinline
   100  func Cas64(ptr *uint64, old, new uint64) bool {
   101  	if *ptr == old {
   102  		*ptr = new
   103  		return true
   104  	}
   105  	return false
   106  }
   107  
   108  //go:nosplit
   109  //go:noinline
   110  func Store(ptr *uint32, val uint32) {
   111  	*ptr = val
   112  }
   113  
   114  //go:nosplit
   115  //go:noinline
   116  func StoreRel(ptr *uint32, val uint32) {
   117  	*ptr = val
   118  }
   119  
   120  //go:nosplit
   121  //go:noinline
   122  func Store64(ptr *uint64, val uint64) {
   123  	*ptr = val
   124  }
   125  
   126  //go:noinline
   127  //go:nosplit
   128  func StorepNoWB(ptr unsafe.Pointer, val unsafe.Pointer) {
   129  	*(*uintptr)(ptr) = uintptr(val)
   130  }
   131  
   132  //go:nosplit
   133  //go:noinline
   134  func Cas(ptr *uint32, old, new uint32) bool {
   135  	if *ptr == old {
   136  		*ptr = new
   137  		return true
   138  	}
   139  	return false
   140  }
   141  
   142  //go:nosplit
   143  //go:noinline
   144  func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool {
   145  	if *ptr == old {
   146  		*ptr = new
   147  		return true
   148  	}
   149  	return false
   150  }
   151  
   152  //go:nosplit
   153  //go:noinline
   154  func Casuintptr(ptr *uintptr, old, new uintptr) bool {
   155  	if *ptr == old {
   156  		*ptr = new
   157  		return true
   158  	}
   159  	return false
   160  }
   161  
   162  //go:nosplit
   163  //go:noinline
   164  func CasRel(ptr *uint32, old, new uint32) bool {
   165  	if *ptr == old {
   166  		*ptr = new
   167  		return true
   168  	}
   169  	return false
   170  }
   171  
   172  //go:nosplit
   173  //go:noinline
   174  func Storeuintptr(ptr *uintptr, new uintptr) {
   175  	*ptr = new
   176  }
   177  
   178  //go:nosplit
   179  //go:noinline
   180  func Loaduintptr(ptr *uintptr) uintptr {
   181  	return *ptr
   182  }
   183  
   184  //go:nosplit
   185  //go:noinline
   186  func Loaduint(ptr *uint) uint {
   187  	return *ptr
   188  }
   189  
   190  //go:nosplit
   191  //go:noinline
   192  func Loadint64(ptr *int64) int64 {
   193  	return *ptr
   194  }
   195  
   196  //go:nosplit
   197  //go:noinline
   198  func Xaddint64(ptr *int64, delta int64) int64 {
   199  	new := *ptr + delta
   200  	*ptr = new
   201  	return new
   202  }