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Added a simple (and completely non-reliable) C implementation for atomic_set(),

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and atomic_test_and_set() for userland testing purposes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1987 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2002-11-18 01:16:27 +00:00
parent 7781a5df6b
commit 0c9a17ce08
1 changed files with 20 additions and 1 deletions
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src/add-ons/kernel/file_systems/bfs/Utility.h
+20 -1
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@@ -114,7 +114,26 @@ template<class Node> struct list {
// atomic_set(value, newValue) // atomic_set(value, newValue)
// sets "value" to "newValue" // sets "value" to "newValue"
#if __INTEL__ #if _NO_INLINE_ASM
// Note that these atomic versions *don't* work as expected!
// They are only used for single processor user space tests
// (and don't even work correctly there)
inline int32
atomic_test_and_set(volatile int32 *value, int32 newValue, int32 testAgainst)
{
int32 oldValue = *value;
if (oldValue == testAgainst)
*value = newValue;
return oldValue;
}
inline void
atomic_set(volatile int32 *value, int32 newValue)
{
*value = newValue;
}
#elif __INTEL__
inline int32 inline int32
atomic_test_and_set(volatile int32 *value, int32 newValue, int32 testAgainst) atomic_test_and_set(volatile int32 *value, int32 newValue, int32 testAgainst)
{ {