futex.h

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Glibc independent futex library for testing kernel functionality.
 * Shamelessly stolen from Darren Hart <dvhltc@us.ibm.com>
 *    http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/
 */

#ifndef _FUTEX_H
#define _FUTEX_H

#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <linux/futex.h>

#define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
    syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)

static inline int
futex_wait(u_int32_t *uaddr, u_int32_t val, struct timespec *timeout, int opflags)
{
    return futex(uaddr, FUTEX_WAIT, val, timeout, NULL, 0, opflags);
}

static inline int
futex_wake(u_int32_t *uaddr, int nr_wake, int opflags)
{
    return futex(uaddr, FUTEX_WAKE, nr_wake, NULL, NULL, 0, opflags);
}

static inline int
futex_lock_pi(u_int32_t *uaddr, struct timespec *timeout, int opflags)
{
    return futex(uaddr, FUTEX_LOCK_PI, 0, timeout, NULL, 0, opflags);
}

static inline int
futex_unlock_pi(u_int32_t *uaddr, int opflags)
{
    return futex(uaddr, FUTEX_UNLOCK_PI, 0, NULL, NULL, 0, opflags);
}

static inline int
futex_cmp_requeue(u_int32_t *uaddr, u_int32_t val, u_int32_t *uaddr2, int nr_wake,
         int nr_requeue, int opflags)
{
    return futex(uaddr, FUTEX_CMP_REQUEUE, nr_wake, nr_requeue, uaddr2,
         val, opflags);
}

#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
#include <pthread.h>
#include <linux/compiler.h>
static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr __maybe_unused,
                          size_t cpusetsize __maybe_unused,
                          cpu_set_t *cpuset __maybe_unused)
{
    return 0;
}
#endif

#endif /* _FUTEX_H */