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Diffstat (limited to 'src/pkg/runtime/arm/atomic.c')
-rw-r--r-- | src/pkg/runtime/arm/atomic.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/pkg/runtime/arm/atomic.c b/src/pkg/runtime/arm/atomic.c new file mode 100644 index 000000000..52e4059ae --- /dev/null +++ b/src/pkg/runtime/arm/atomic.c @@ -0,0 +1,83 @@ +// 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·xchg(uint32 volatile* addr, uint32 v) +{ + uint32 old; + + for(;;) { + old = *addr; + if(runtime·cas(addr, old, v)) + return old; + } +} + +#pragma textflag 7 +void +runtime·procyield(uint32 cnt) +{ + uint32 volatile i; + + for(i = 0; i < cnt; i++) { + } +} + +#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; + } +} + +#pragma textflag 7 +void +runtime·atomicstore(uint32 volatile* addr, uint32 v) +{ + uint32 old; + + for(;;) { + old = *addr; + if(runtime·cas(addr, old, v)) + return; + } +}
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