X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=include%2Furcu%2Ffutex.h;h=9d0a997473c025563bd9c557225e2029ecd6f831;hb=HEAD;hp=0486ff6a1830f174d7471164a282507a6d1f756c;hpb=6893800a4d1cc14dff0395ddcd660a5138db183d;p=urcu.git diff --git a/include/urcu/futex.h b/include/urcu/futex.h index 0486ff6..f1181ee 100644 --- a/include/urcu/futex.h +++ b/include/urcu/futex.h @@ -1,37 +1,52 @@ +// SPDX-FileCopyrightText: 2011-2012 Mathieu Desnoyers +// +// SPDX-License-Identifier: LGPL-2.1-or-later + #ifndef _URCU_FUTEX_H #define _URCU_FUTEX_H /* - * urcu-futex.h - * * Userspace RCU - sys_futex/compat_futex header. - * - * Copyright 2011-2012 - Mathieu Desnoyers - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include +#include + +#include #include +#include + +#if (defined(__linux__) && defined(__NR_futex)) + +/* For backwards compat */ +# define CONFIG_RCU_HAVE_FUTEX 1 + +# include +# include +# include +# include +# include + +#elif defined(__FreeBSD__) + +# include +# include + +#elif defined(__OpenBSD__) + +# include +# include + +#endif #ifdef __cplusplus extern "C" { #endif -#define FUTEX_WAIT 0 -#define FUTEX_WAKE 1 +#ifndef __OpenBSD__ +# define FUTEX_WAIT 0 +# define FUTEX_WAKE 1 +#endif /* * sys_futex compatibility header. @@ -52,18 +67,12 @@ extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val, extern int compat_futex_async(int32_t *uaddr, int op, int32_t val, const struct timespec *timeout, int32_t *uaddr2, int32_t val3); -#ifdef CONFIG_RCU_HAVE_FUTEX - -#include -#include -#include -#include +#if (defined(__linux__) && defined(__NR_futex)) static inline int futex(int32_t *uaddr, int op, int32_t val, const struct timespec *timeout, int32_t *uaddr2, int32_t val3) { - return syscall(__NR_futex, uaddr, op, val, timeout, - uaddr2, val3); + return syscall(__NR_futex, uaddr, op, val, timeout, uaddr2, val3); } static inline int futex_noasync(int32_t *uaddr, int op, int32_t val, @@ -102,6 +111,114 @@ static inline int futex_async(int32_t *uaddr, int op, int32_t val, return ret; } +#elif defined(__FreeBSD__) + +static inline int futex_async(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + int umtx_op; + void *umtx_uaddr = NULL, *umtx_uaddr2 = NULL; + struct _umtx_time umtx_timeout = { + ._flags = UMTX_ABSTIME, + ._clockid = CLOCK_MONOTONIC, + }; + + /* + * Check if NULL or zero. Don't let users expect that they are + * taken into account. + */ + urcu_posix_assert(!uaddr2); + urcu_posix_assert(!val3); + + switch (op) { + case FUTEX_WAIT: + /* On FreeBSD, a "u_int" is a 32-bit integer. */ + umtx_op = UMTX_OP_WAIT_UINT; + if (timeout != NULL) { + umtx_timeout._timeout = *timeout; + umtx_uaddr = (void *) sizeof(umtx_timeout); + umtx_uaddr2 = (void *) &umtx_timeout; + } + break; + case FUTEX_WAKE: + umtx_op = UMTX_OP_WAKE; + break; + default: + errno = EINVAL; + return -1; + } + + return _umtx_op(uaddr, umtx_op, (uint32_t) val, umtx_uaddr, + umtx_uaddr2); +} + +static inline int futex_noasync(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + return futex_async(uaddr, op, val, timeout, uaddr2, val3); +} + +#elif defined(__OpenBSD__) + +static inline int futex_noasync(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + int ret; + + /* + * Check that val3 is zero. Don't let users expect that it is + * taken into account. + */ + urcu_posix_assert(!val3); + + ret = futex((volatile uint32_t *) uaddr, op, val, timeout, + (volatile uint32_t *) uaddr2); + if (caa_unlikely(ret < 0 && errno == ENOSYS)) { + return compat_futex_noasync(uaddr, op, val, timeout, + uaddr2, val3); + } + return ret; +} + +static inline int futex_async(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + int ret; + + /* + * Check that val3 is zero. Don't let users expect that it is + * taken into account. + */ + urcu_posix_assert(!val3); + + ret = futex((volatile uint32_t *) uaddr, op, val, timeout, + (volatile uint32_t *) uaddr2); + if (caa_unlikely(ret < 0 && errno == ENOSYS)) { + return compat_futex_async(uaddr, op, val, timeout, + uaddr2, val3); + } + return ret; +} + +#elif defined(__CYGWIN__) + +/* + * The futex_noasync compat code uses a weak symbol to share state across + * different shared object which is not possible on Windows with the + * Portable Executable format. Use the async compat code for both cases. + */ +static inline int futex_noasync(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + return compat_futex_async(uaddr, op, val, timeout, uaddr2, val3); +} + +static inline int futex_async(int32_t *uaddr, int op, int32_t val, + const struct timespec *timeout, int32_t *uaddr2, int32_t val3) +{ + return compat_futex_async(uaddr, op, val, timeout, uaddr2, val3); +} + #else static inline int futex_noasync(int32_t *uaddr, int op, int32_t val,