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NetBSD specific atomic operation implementation

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Signed-off-by: Lennart Poettering <lennart@poettering.net>
This commit is contained in:
Jared D. McNeill 2009-01-22 01:52:35 +01:00 • committed by Lennart Poettering
parent cc425ed260
commit 8d89ccdcf2
2 changed files with 150 additions and 53 deletions
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73
src/pulsecore/atomic.h
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@ -107,6 +107,79 @@ static inline pa_bool_t pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, v
return __sync_bool_compare_and_swap(&a->value, (long) old_p, (long) new_p);
}
#elif defined(__NetBSD__) && defined(HAVE_SYS_ATOMIC_H)
/* NetBSD 5.0+ atomic_ops(3) implementation */
#include <sys/atomic.h>
typedef struct pa_atomic {
volatile unsigned int value;
} pa_atomic_t;
#define PA_ATOMIC_INIT(v) { .value = (unsigned int) (v) }
static inline int pa_atomic_load(const pa_atomic_t *a) {
membar_sync();
return (int) a->value;
}
static inline void pa_atomic_store(pa_atomic_t *a, int i) {
a->value = (unsigned int) i;
membar_sync();
}
/* Returns the previously set value */
static inline int pa_atomic_add(pa_atomic_t *a, int i) {
int nv = (int) atomic_add_int_nv(&a->value, i);
return nv - i;
}
/* Returns the previously set value */
static inline int pa_atomic_sub(pa_atomic_t *a, int i) {
int nv = (int) atomic_add_int_nv(&a->value, -i);
return nv + i;
}
/* Returns the previously set value */
static inline int pa_atomic_inc(pa_atomic_t *a) {
int nv = (int) atomic_inc_uint_nv(&a->value);
return nv - 1;
}
/* Returns the previously set value */
static inline int pa_atomic_dec(pa_atomic_t *a) {
int nv = (int) atomic_dec_uint_nv(&a->value);
return nv + 1;
}
/* Returns TRUE when the operation was successful. */
static inline pa_bool_t pa_atomic_cmpxchg(pa_atomic_t *a, int old_i, int new_i) {
unsigned int r = atomic_cas_uint(&a->value, (unsigned int) old_i, (unsigned int) new_i);
return (int) r == old_i;
}
typedef struct pa_atomic_ptr {
volatile void *value;
} pa_atomic_ptr_t;
#define PA_ATOMIC_PTR_INIT(v) { .value = (v) }
static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t *a) {
membar_sync();
return (void *) a->value;
}
static inline void pa_atomic_ptr_store(pa_atomic_ptr_t *a, void *p) {
a->value = p;
membar_sync();
}
static inline pa_bool_t pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, void* new_p) {
void *r = atomic_cas_ptr(&a->value, old_p, new_p);
return r == old_p;
}
#elif defined(__GNUC__) && (defined(__amd64__) || defined(__x86_64__))
#warn "The native atomic operations implementation for AMD64 has not been tested thoroughly. libatomic_ops is known to not work properly on AMD64 and your gcc version is too old for the gcc-builtin atomic ops support. You have three options now: test the native atomic operations implementation for AMD64, fix libatomic_ops, or upgrade your GCC."