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an implementation of the Mellor-Crummey Scott (MCS) lock

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This commit is contained in:
Balazs Gerofi
2015-08-20 15:26:38 +09:00
parent 5a0cd3f53f
commit 7c816a6b73
2 changed files with 78 additions and 0 deletions
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23
arch/x86/kernel/include/ihk/atomic.h
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@ -112,6 +112,17 @@ static inline int ihk_atomic_sub_return(int i, ihk_atomic_t *v)
__x; \
})
static inline unsigned long xchg8(unsigned long *ptr, unsigned long x)
{
unsigned long __x = (x);
asm volatile("xchgq %0,%1"
: "=r" (__x)
: "m" (*(volatile unsigned long*)(ptr)), "0" (__x)
: "memory");
return __x;
}
#define __xchg(x, ptr, size) \
({ \
__typeof(*(ptr)) __x = (x); \
@ -150,5 +161,17 @@ static inline int ihk_atomic_sub_return(int i, ihk_atomic_t *v)
#define xchg(ptr, v) \
__xchg((v), (ptr), sizeof(*ptr))
static inline unsigned long atomic_cmpxchg8(unsigned long *addr,
unsigned long oldval,
unsigned long newval)
{
asm volatile("lock; cmpxchgq %3, %1\n"
: "=a" (oldval), "+m" (*addr)
: "r" (newval), "0" (oldval)
: "memory"
);
return oldval;
}
#endif