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util: emulate futex on FreeBSD using umtx 

Obtained from: FreeBSD ports
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>
This commit is contained in:
Greg V 2017-12-24 19:55:46 +03:00 committed by Eric Engestrom
parent 00f838fa73
commit 7dc2f47882
1 changed files with 34 additions and 0 deletions
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34
src/util/futex.h
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@ -51,6 +51,40 @@ static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespe
FUTEX_BITSET_MATCH_ANY);
}
#elif defined(__FreeBSD__)
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/umtx.h>
#include <sys/time.h>
static inline int futex_wake(uint32_t *addr, int count)
{
assert(count == (int)(uint32_t)count); /* Check that bits weren't discarded */
return _umtx_op(addr, UMTX_OP_WAKE, (uint32_t)count, NULL, NULL) == -1 ? errno : 0;
}
static inline int futex_wait(uint32_t *addr, int32_t value, struct timespec *timeout)
{
void *uaddr = NULL, *uaddr2 = NULL;
assert(value == (int)(uint32_t)value); /* Check that bits weren't discarded */
if (timeout != NULL) {
const struct _umtx_time tmo = {
._timeout = *timeout,
._flags = UMTX_ABSTIME,
._clockid = CLOCK_MONOTONIC
};
uaddr = (void *)(uintptr_t)sizeof(tmo);
uaddr2 = (void *)&tmo;
}
return _umtx_op(addr, UMTX_OP_WAIT_UINT, (uint32_t)value, uaddr, uaddr2) == -1 ? errno : 0;
}
#endif
#endif /* UTIL_FUTEX_H */