musl/src/internal/futex.h

#ifndef _INTERNAL_FUTEX_H
#define _INTERNAL_FUTEX_H

#define FUTEX_WAIT		0
#define FUTEX_WAKE		1
#define FUTEX_FD		2
#define FUTEX_REQUEUE		3
#define FUTEX_CMP_REQUEUE	4
#define FUTEX_WAKE_OP		5
#define FUTEX_LOCK_PI		6
#define FUTEX_UNLOCK_PI		7
#define FUTEX_TRYLOCK_PI	8
#define FUTEX_WAIT_BITSET	9

#define FUTEX_CLOCK_REALTIME 256

int __futex(volatile int *, int, int, void *);

#endif