diff options
Diffstat (limited to 'src/corelib/thread/qfutex_p.h')
| -rw-r--r-- | src/corelib/thread/qfutex_p.h | 177 |
1 files changed, 13 insertions, 164 deletions
diff --git a/src/corelib/thread/qfutex_p.h b/src/corelib/thread/qfutex_p.h index 40482b6fc1..8ba798f920 100644 --- a/src/corelib/thread/qfutex_p.h +++ b/src/corelib/thread/qfutex_p.h @@ -1,41 +1,5 @@ -/**************************************************************************** -** -** Copyright (C) 2017 Intel Corporation. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the QtCore module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or (at your option) the GNU General -** Public license version 3 or any later version approved by the KDE Free -** Qt Foundation. The licenses are as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2017 Intel Corporation. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #ifndef QFUTEX_P_H #define QFUTEX_P_H @@ -51,37 +15,16 @@ // We mean it. // -#include <qglobal.h> - -#if (__has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)) && __has_include(<sanitizer/tsan_interface.h>) -# include <sanitizer/tsan_interface.h> -inline void _q_tsan_acquire(void *addr, void *addr2 = nullptr) -{ - // A futex call ensures total ordering on the futex words - // (in either success or failure of the call). Instruct TSAN accordingly, - // as TSAN does not understand the futex(2) syscall (or equivalent). - __tsan_acquire(addr); - if (addr2) - __tsan_acquire(addr2); -} -inline void _q_tsan_release(void *addr, void *addr2 = nullptr) -{ - if (addr2) - __tsan_release(addr2); - __tsan_release(addr); -} -#else -inline void _q_tsan_acquire(void *, void * = nullptr) {} -inline void _q_tsan_release(void *, void * = nullptr) {} -#endif // building for TSAN and __has_include(<sanitizer/tsan_interface.h>) +#include <qdeadlinetimer.h> +#include <private/qglobal_p.h> QT_BEGIN_NAMESPACE namespace QtDummyFutex { constexpr inline bool futexAvailable() { return false; } template <typename Atomic> - inline bool futexWait(Atomic &, typename Atomic::Type, int = 0) - { Q_UNREACHABLE(); return false; } + inline bool futexWait(Atomic &, typename Atomic::Type, QDeadlineTimer = {}) + { Q_UNREACHABLE_RETURN(false); } template <typename Atomic> inline void futexWakeOne(Atomic &) { Q_UNREACHABLE(); } template <typename Atomic> inline void futexWakeAll(Atomic &) @@ -90,110 +33,16 @@ namespace QtDummyFutex { QT_END_NAMESPACE -#if defined(Q_OS_LINUX) && !defined(QT_LINUXBASE) +#if defined(Q_OS_DARWIN) +# include "qfutex_mac_p.h" +#elif defined(Q_OS_FREEBSD) +# include "qfutex_freebsd_p.h" +#elif defined(Q_OS_LINUX) && !defined(QT_LINUXBASE) // use Linux mutexes everywhere except for LSB builds -# include <sys/syscall.h> -# include <errno.h> -# include <limits.h> -# include <unistd.h> -# include <asm/unistd.h> -# include <linux/futex.h> -# define QT_ALWAYS_USE_FUTEX - -// if not defined in linux/futex.h -# define FUTEX_PRIVATE_FLAG 128 // added in v2.6.22 - -QT_BEGIN_NAMESPACE -namespace QtLinuxFutex { - constexpr inline bool futexAvailable() { return true; } - inline int _q_futex(int *addr, int op, int val, quintptr val2 = 0, - int *addr2 = nullptr, int val3 = 0) noexcept - { - _q_tsan_release(addr, addr2); - - // we use __NR_futex because some libcs (like Android's bionic) don't - // provide SYS_futex etc. - int result = syscall(__NR_futex, addr, op | FUTEX_PRIVATE_FLAG, val, val2, addr2, val3); - - _q_tsan_acquire(addr, addr2); - - return result; - } - template <typename T> int *addr(T *ptr) - { - int *int_addr = reinterpret_cast<int *>(ptr); -#if Q_BYTE_ORDER == Q_BIG_ENDIAN - if (sizeof(T) > sizeof(int)) - int_addr++; //We want a pointer to the least significant half -#endif - return int_addr; - } - - template <typename Atomic> - inline void futexWait(Atomic &futex, typename Atomic::Type expectedValue) - { - _q_futex(addr(&futex), FUTEX_WAIT, qintptr(expectedValue)); - } - template <typename Atomic> - inline bool futexWait(Atomic &futex, typename Atomic::Type expectedValue, qint64 nstimeout) - { - struct timespec ts; - ts.tv_sec = nstimeout / 1000 / 1000 / 1000; - ts.tv_nsec = nstimeout % (1000 * 1000 * 1000); - int r = _q_futex(addr(&futex), FUTEX_WAIT, qintptr(expectedValue), quintptr(&ts)); - return r == 0 || errno != ETIMEDOUT; - } - template <typename Atomic> inline void futexWakeOne(Atomic &futex) - { - _q_futex(addr(&futex), FUTEX_WAKE, 1); - } - template <typename Atomic> inline void futexWakeAll(Atomic &futex) - { - _q_futex(addr(&futex), FUTEX_WAKE, INT_MAX); - } - template <typename Atomic> inline - void futexWakeOp(Atomic &futex1, int wake1, int wake2, Atomic &futex2, quint32 op) - { - _q_futex(addr(&futex1), FUTEX_WAKE_OP, wake1, wake2, addr(&futex2), op); - } -} -namespace QtFutex = QtLinuxFutex; -QT_END_NAMESPACE - +# include "qfutex_linux_p.h" #elif defined(Q_OS_WIN) -# include <qt_windows.h> - -QT_BEGIN_NAMESPACE -namespace QtWindowsFutex { -#define QT_ALWAYS_USE_FUTEX -constexpr inline bool futexAvailable() { return true; } - -template <typename Atomic> -inline void futexWait(Atomic &futex, typename Atomic::Type expectedValue) -{ - _q_tsan_release(&futex); - WaitOnAddress(&futex, &expectedValue, sizeof(expectedValue), INFINITE); - _q_tsan_acquire(&futex); -} -template <typename Atomic> -inline bool futexWait(Atomic &futex, typename Atomic::Type expectedValue, qint64 nstimeout) -{ - BOOL r = WaitOnAddress(&futex, &expectedValue, sizeof(expectedValue), DWORD(nstimeout / 1000 / 1000)); - return r || GetLastError() != ERROR_TIMEOUT; -} -template <typename Atomic> inline void futexWakeAll(Atomic &futex) -{ - WakeByAddressAll(&futex); -} -template <typename Atomic> inline void futexWakeOne(Atomic &futex) -{ - WakeByAddressSingle(&futex); -} -} -namespace QtFutex = QtWindowsFutex; -QT_END_NAMESPACE +# include "qfutex_win_p.h" #else - QT_BEGIN_NAMESPACE namespace QtFutex = QtDummyFutex; QT_END_NAMESPACE |