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ensure that the compiler doesn't try to reorder around atomic ops

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This commit is contained in:
Rich Felker 2011-02-12 00:26:24 -05:00
parent 0b44a0315b
commit 0bcbb53dc4
1 changed files with 13 additions and 13 deletions
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26
src/internal/atomic.h
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@ -15,13 +15,13 @@ static inline int a_ctz_64(uint64_t x)
static inline void a_and_64(volatile uint64_t *p, uint64_t v) static inline void a_and_64(volatile uint64_t *p, uint64_t v)
{ {
__asm__( "lock ; andl %1, (%0) ; lock ; andl %2, 4(%0)" __asm__( "lock ; andl %1, (%0) ; lock ; andl %2, 4(%0)"
: : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) ); : : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) : "memory" );
} }
static inline void a_or_64(volatile uint64_t *p, uint64_t v) static inline void a_or_64(volatile uint64_t *p, uint64_t v)
{ {
__asm__( "lock ; orl %1, (%0) ; lock ; orl %2, 4(%0)" __asm__( "lock ; orl %1, (%0) ; lock ; orl %2, 4(%0)"
: : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) ); : : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) : "memory" );
} }
static inline void a_store_l(volatile void *p, long x) static inline void a_store_l(volatile void *p, long x)
@ -32,49 +32,49 @@ static inline void a_store_l(volatile void *p, long x)
static inline void a_or_l(volatile void *p, long v) static inline void a_or_l(volatile void *p, long v)
{ {
__asm__( "lock ; orl %1, %0" __asm__( "lock ; orl %1, %0"
: "=m"(*(long *)p) : "r"(v) ); : "=m"(*(long *)p) : "r"(v) : "memory" );
} }
static inline void *a_cas_p(volatile void *p, void *t, void *s) static inline void *a_cas_p(volatile void *p, void *t, void *s)
{ {
__asm__( "lock ; cmpxchg %3, %1" __asm__( "lock ; cmpxchg %3, %1"
: "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) ); : "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) : "memory" );
return t; return t;
} }
static inline long a_cas_l(volatile void *p, long t, long s) static inline long a_cas_l(volatile void *p, long t, long s)
{ {
__asm__( "lock ; cmpxchg %3, %1" __asm__( "lock ; cmpxchg %3, %1"
: "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) ); : "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) : "memory" );
return t; return t;
} }
static inline void *a_swap_p(void *volatile *x, void *v) static inline void *a_swap_p(void *volatile *x, void *v)
{ {
__asm__( "xchg %0, %1" : "=r"(v), "=m"(*(void **)x) : "0"(v) ); __asm__( "xchg %0, %1" : "=r"(v), "=m"(*(void **)x) : "0"(v) : "memory" );
return v; return v;
} }
static inline long a_swap_l(volatile void *x, long v) static inline long a_swap_l(volatile void *x, long v)
{ {
__asm__( "xchg %0, %1" : "=r"(v), "=m"(*(long *)x) : "0"(v) ); __asm__( "xchg %0, %1" : "=r"(v), "=m"(*(long *)x) : "0"(v) : "memory" );
return v; return v;
} }
static inline void a_or(volatile void *p, int v) static inline void a_or(volatile void *p, int v)
{ {
__asm__( "lock ; orl %1, %0" __asm__( "lock ; orl %1, %0"
: "=m"(*(int *)p) : "r"(v) ); : "=m"(*(int *)p) : "r"(v) : "memory" );
} }
static inline void a_and(volatile void *p, int v) static inline void a_and(volatile void *p, int v)
{ {
__asm__( "lock ; andl %1, %0" __asm__( "lock ; andl %1, %0"
: "=m"(*(int *)p) : "r"(v) ); : "=m"(*(int *)p) : "r"(v) : "memory" );
} }
static inline int a_swap(volatile int *x, int v) static inline int a_swap(volatile int *x, int v)
{ {
__asm__( "xchg %0, %1" : "=r"(v), "=m"(*x) : "0"(v) ); __asm__( "xchg %0, %1" : "=r"(v), "=m"(*x) : "0"(v) : "memory" );
return v; return v;
} }
@ -82,18 +82,18 @@ static inline int a_swap(volatile int *x, int v)
static inline int a_fetch_add(volatile int *x, int v) static inline int a_fetch_add(volatile int *x, int v)
{ {
__asm__( "lock ; xadd %0, %1" : "=r"(v), "=m"(*x) : "0"(v) ); __asm__( "lock ; xadd %0, %1" : "=r"(v), "=m"(*x) : "0"(v) : "memory" );
return v; return v;
} }
static inline void a_inc(volatile int *x) static inline void a_inc(volatile int *x)
{ {
__asm__( "lock ; incl %0" : "=m"(*x) : "m"(*x) ); __asm__( "lock ; incl %0" : "=m"(*x) : "m"(*x) : "memory" );
} }
static inline void a_dec(volatile int *x) static inline void a_dec(volatile int *x)
{ {
__asm__( "lock ; decl %0" : "=m"(*x) : "m"(*x) ); __asm__( "lock ; decl %0" : "=m"(*x) : "m"(*x) : "memory" );
} }
static inline void a_store(volatile int *p, int x) static inline void a_store(volatile int *p, int x)