16304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner/* 26304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * Copyright (C) 2008 The Android Open Source Project 36304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * All rights reserved. 46304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * 56304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * Redistribution and use in source and binary forms, with or without 66304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * modification, are permitted provided that the following conditions 76304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * are met: 86304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * * Redistributions of source code must retain the above copyright 96304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * notice, this list of conditions and the following disclaimer. 106304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * * Redistributions in binary form must reproduce the above copyright 116304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * notice, this list of conditions and the following disclaimer in 126304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * the documentation and/or other materials provided with the 136304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * distribution. 146304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * 156304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 166304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 176304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 186304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 196304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 206304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 216304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 226304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 236304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 246304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 256304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 266304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner * SUCH DAMAGE. 276304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner */ 286304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner#ifndef _BIONIC_FUTEX_H 296304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner#define _BIONIC_FUTEX_H 306304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner 31b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes#include <errno.h> 326304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner#include <linux/futex.h> 33d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes#include <stdbool.h> 34d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes#include <stddef.h> 35b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes#include <sys/cdefs.h> 36b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes#include <sys/syscall.h> 376304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner 383e898476c7230b60a0f76968e64ff25f475b48c0Elliott Hughes__BEGIN_DECLS 393e898476c7230b60a0f76968e64ff25f475b48c0Elliott Hughes 40d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughesstruct timespec; 416304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner 42b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughesstatic inline __always_inline int __futex(volatile void* ftx, int op, int value, const struct timespec* timeout) { 43b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes // Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to. 44b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes int saved_errno = errno; 451ee46520caa1a2a47c69d58f49f4042194ec0339Elliott Hughes int result = syscall(__NR_futex, ftx, op, value, timeout); 461ee46520caa1a2a47c69d58f49f4042194ec0339Elliott Hughes if (__predict_false(result == -1)) { 471ee46520caa1a2a47c69d58f49f4042194ec0339Elliott Hughes result = -errno; 48b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes errno = saved_errno; 49b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes } 501ee46520caa1a2a47c69d58f49f4042194ec0339Elliott Hughes return result; 51b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes} 526304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner 53d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughesstatic inline int __futex_wake(volatile void* ftx, int count) { 54b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes return __futex(ftx, FUTEX_WAKE, count, NULL); 55d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes} 56d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes 57d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughesstatic inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) { 58b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL); 59d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes} 60d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes 61d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughesstatic inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) { 62b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes return __futex(ftx, FUTEX_WAIT, value, timeout); 63d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes} 64d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes 65d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughesstatic inline int __futex_wait_ex(volatile void* ftx, bool shared, int value, const struct timespec* timeout) { 66b30aff405a220495941f1673b0a5e66c4fa8b84cElliott Hughes return __futex(ftx, shared ? FUTEX_WAIT : FUTEX_WAIT_PRIVATE, value, timeout); 67d5ed63a6a8290de88802172ce178656fbafe70c6Elliott Hughes} 686304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner 693e898476c7230b60a0f76968e64ff25f475b48c0Elliott Hughes__END_DECLS 703e898476c7230b60a0f76968e64ff25f475b48c0Elliott Hughes 716304d8b21891fd0cb7b5a4c25159a3d3b1709d62David 'Digit' Turner#endif /* _BIONIC_FUTEX_H */ 72