diff options
Diffstat (limited to 'src/corelib/kernel/qelapsedtimer_unix.cpp')
| -rw-r--r-- | src/corelib/kernel/qelapsedtimer_unix.cpp | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/src/corelib/kernel/qelapsedtimer_unix.cpp b/src/corelib/kernel/qelapsedtimer_unix.cpp deleted file mode 100644 index 07a47d40a7..0000000000 --- a/src/corelib/kernel/qelapsedtimer_unix.cpp +++ /dev/null @@ -1,259 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Copyright (C) 2016 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. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "qelapsedtimer.h" -#include "qdeadlinetimer.h" -#include "qdeadlinetimer_p.h" -#if defined(Q_OS_VXWORKS) -#include "qfunctions_vxworks.h" -#else -#include <sys/time.h> -#include <time.h> -#endif -#include <unistd.h> - -#include <qatomic.h> -#include "private/qcore_unix_p.h" - -#if defined(QT_NO_CLOCK_MONOTONIC) || defined(QT_BOOTSTRAPPED) -// turn off the monotonic clock -# ifdef _POSIX_MONOTONIC_CLOCK -# undef _POSIX_MONOTONIC_CLOCK -# endif -# define _POSIX_MONOTONIC_CLOCK -1 -#endif - -QT_BEGIN_NAMESPACE - -/* - * Design: - * - * POSIX offers a facility to select the system's monotonic clock when getting - * the current timestamp. Whereas the functions are mandatory in POSIX.1-2008, - * the presence of a monotonic clock is a POSIX Option (see the document - * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap02.html#tag_02_01_06 ) - * - * The macro _POSIX_MONOTONIC_CLOCK can therefore assume the following values: - * -1 monotonic clock is never supported on this system - * 0 monotonic clock might be supported, runtime check is needed - * >1 (such as 200809L) monotonic clock is always supported - * - * The unixCheckClockType() function will return the clock to use: either - * CLOCK_MONOTONIC or CLOCK_REALTIME. In the case the POSIX option has a value - * of zero, then this function stores a static that contains the clock to be - * used. - * - * There's one extra case, which is when CLOCK_REALTIME isn't defined. When - * that's the case, we'll emulate the clock_gettime function with gettimeofday. - * - * Conforming to: - * POSIX.1b-1993 section "Clocks and Timers" - * included in UNIX98 (Single Unix Specification v2) - * included in POSIX.1-2001 - * see http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html - */ - -#if !defined(CLOCK_REALTIME) -# define CLOCK_REALTIME 0 -static inline void qt_clock_gettime(int, struct timespec *ts) -{ - // support clock_gettime with gettimeofday - struct timeval tv; - gettimeofday(&tv, 0); - ts->tv_sec = tv.tv_sec; - ts->tv_nsec = tv.tv_usec * 1000; -} - -static inline int regularClock() -{ - return 0; -} -#else -static inline void qt_clock_gettime(clockid_t clock, struct timespec *ts) -{ - clock_gettime(clock, ts); -} - -static inline clock_t regularClockCheck() -{ - struct timespec regular_clock_resolution; - int r = -1; - -# ifdef CLOCK_MONOTONIC - // try the monotonic clock - r = clock_getres(CLOCK_MONOTONIC, ®ular_clock_resolution); - -# ifdef Q_OS_LINUX - // Despite glibc claiming that we should check at runtime, the Linux kernel - // always supports the monotonic clock - Q_ASSERT(r == 0); - return CLOCK_MONOTONIC; -# endif - - if (r == 0) - return CLOCK_MONOTONIC; -# endif - - // no monotonic, try the realtime clock - r = clock_getres(CLOCK_REALTIME, ®ular_clock_resolution); - Q_ASSERT(r == 0); - return CLOCK_REALTIME; -} - -static inline clock_t regularClock() -{ - static const clock_t clock = regularClockCheck(); - return clock; -} -#endif - -bool QElapsedTimer::isMonotonic() noexcept -{ - return clockType() == MonotonicClock; -} - -QElapsedTimer::ClockType QElapsedTimer::clockType() noexcept -{ - return regularClock() == CLOCK_REALTIME ? SystemTime : MonotonicClock; -} - -static inline void do_gettime(qint64 *sec, qint64 *frac) -{ - timespec ts; - qt_clock_gettime(regularClock(), &ts); - *sec = ts.tv_sec; - *frac = ts.tv_nsec; -} - -// used in qcore_unix.cpp and qeventdispatcher_unix.cpp -struct timespec qt_gettime() noexcept -{ - qint64 sec, frac; - do_gettime(&sec, &frac); - - timespec tv; - tv.tv_sec = sec; - tv.tv_nsec = frac; - - return tv; -} - -void qt_nanosleep(timespec amount) -{ - // We'd like to use clock_nanosleep. - // - // But clock_nanosleep is from POSIX.1-2001 and both are *not* - // affected by clock changes when using relative sleeps, even for - // CLOCK_REALTIME. - // - // nanosleep is POSIX.1-1993 - - int r; - EINTR_LOOP(r, nanosleep(&amount, &amount)); -} - -static qint64 elapsedAndRestart(qint64 sec, qint64 frac, - qint64 *nowsec, qint64 *nowfrac) -{ - do_gettime(nowsec, nowfrac); - sec = *nowsec - sec; - frac = *nowfrac - frac; - return (sec * Q_INT64_C(1000000000) + frac) / Q_INT64_C(1000000); -} - -void QElapsedTimer::start() noexcept -{ - do_gettime(&t1, &t2); -} - -qint64 QElapsedTimer::restart() noexcept -{ - return elapsedAndRestart(t1, t2, &t1, &t2); -} - -qint64 QElapsedTimer::nsecsElapsed() const noexcept -{ - qint64 sec, frac; - do_gettime(&sec, &frac); - sec = sec - t1; - frac = frac - t2; - return sec * Q_INT64_C(1000000000) + frac; -} - -qint64 QElapsedTimer::elapsed() const noexcept -{ - return nsecsElapsed() / Q_INT64_C(1000000); -} - -qint64 QElapsedTimer::msecsSinceReference() const noexcept -{ - return t1 * Q_INT64_C(1000) + t2 / Q_INT64_C(1000000); -} - -qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const noexcept -{ - qint64 secs = other.t1 - t1; - qint64 fraction = other.t2 - t2; - return (secs * Q_INT64_C(1000000000) + fraction) / Q_INT64_C(1000000); -} - -qint64 QElapsedTimer::secsTo(const QElapsedTimer &other) const noexcept -{ - return other.t1 - t1; -} - -bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2) noexcept -{ - return v1.t1 < v2.t1 || (v1.t1 == v2.t1 && v1.t2 < v2.t2); -} - -QDeadlineTimer QDeadlineTimer::current(Qt::TimerType timerType) noexcept -{ - static_assert(QDeadlineTimerNanosecondsInT2); - QDeadlineTimer result; - qint64 cursec, curnsec; - do_gettime(&cursec, &curnsec); - result.t1 = cursec; - result.t2 = curnsec; - result.type = timerType; - return result; -} - -QT_END_NAMESPACE |