| // 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. |
| |
| #include "runtime.h" |
| |
| // Atomic add and return new value. |
| #pragma textflag 7 |
| uint32 |
| runtime·xadd(uint32 volatile *val, int32 delta) |
| { |
| uint32 oval, nval; |
| |
| for(;;){ |
| oval = *val; |
| nval = oval + delta; |
| if(runtime·cas(val, oval, nval)) |
| return nval; |
| } |
| } |
| |
| #pragma textflag 7 |
| uint32 |
| runtime·atomicload(uint32 volatile* addr) |
| { |
| return runtime·xadd(addr, 0); |
| } |
| |
| #pragma textflag 7 |
| void* |
| runtime·atomicloadp(void* volatile* addr) |
| { |
| return (void*)runtime·xadd((uint32 volatile*)addr, 0); |
| } |
| |
| #pragma textflag 7 |
| void |
| runtime·atomicstorep(void* volatile* addr, void* v) |
| { |
| void *old; |
| |
| for(;;) { |
| old = *addr; |
| if(runtime·casp(addr, old, v)) |
| return; |
| } |
| } |