diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2016-04-26 21:20:11 -0700 |
---|---|---|
committer | Thiago Macieira <thiago.macieira@intel.com> | 2016-07-02 07:51:45 +0000 |
commit | 169f1beaf55770c2a26d76ad9a63dfd3474cff91 (patch) | |
tree | 50c22c457a4524b145f308a20100a17a6cb23e3e /src/corelib/tools/qelapsedtimer_unix.cpp | |
parent | 6662919ecde901771d9641fd732aa0735ebb39e6 (diff) |
Move QElapsedTimer to src/corelib/kernel
It's really a kernel functionality, as it implements really low-level
functionality and it's used by the event dispatcher. It was in tools/
only because QTime is.
QDeadlineTimer is also coming to kernel/.
Change-Id: Ifea6e497f11a461db432ffff14491c6d9b839eb0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Diffstat (limited to 'src/corelib/tools/qelapsedtimer_unix.cpp')
-rw-r--r-- | src/corelib/tools/qelapsedtimer_unix.cpp | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/src/corelib/tools/qelapsedtimer_unix.cpp b/src/corelib/tools/qelapsedtimer_unix.cpp deleted file mode 100644 index e2c3ae6280..0000000000 --- a/src/corelib/tools/qelapsedtimer_unix.cpp +++ /dev/null @@ -1,251 +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" -#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; -} - -# ifdef _POSIX_MONOTONIC_CLOCK -# undef _POSIX_MONOTONIC_CLOCK -# define _POSIX_MONOTONIC_CLOCK -1 -# endif -#else -static inline void qt_clock_gettime(clockid_t clock, struct timespec *ts) -{ - clock_gettime(clock, ts); -} -#endif - -static int unixCheckClockType() -{ -#ifdef Q_OS_LINUX - // Despite glibc claiming that we should check at runtime, the Linux kernel - // always supports the monotonic clock - return CLOCK_MONOTONIC; -#elif (_POSIX_MONOTONIC_CLOCK-0 == 0) && defined(_SC_MONOTONIC_CLOCK) - // we need a value we can store in a clockid_t that isn't a valid clock - // check if the valid ones are both non-negative or both non-positive -# if CLOCK_MONOTONIC >= 0 && CLOCK_REALTIME >= 0 -# define IS_VALID_CLOCK(clock) (clock >= 0) -# define INVALID_CLOCK -1 -# elif CLOCK_MONOTONIC <= 0 && CLOCK_REALTIME <= 0 -# define IS_VALID_CLOCK(clock) (clock <= 0) -# define INVALID_CLOCK 1 -# else -# error "Sorry, your system has weird values for CLOCK_MONOTONIC and CLOCK_REALTIME" -# endif - - static QBasicAtomicInt clockToUse = Q_BASIC_ATOMIC_INITIALIZER(INVALID_CLOCK); - int clock = clockToUse.loadAcquire(); - if (Q_LIKELY(IS_VALID_CLOCK(clock))) - return clock; - - // detect if the system supports monotonic timers - clock = sysconf(_SC_MONOTONIC_CLOCK) > 0 ? CLOCK_MONOTONIC : CLOCK_REALTIME; - clockToUse.storeRelease(clock); - return clock; - -# undef INVALID_CLOCK -# undef IS_VALID_CLOCK -#elif (_POSIX_MONOTONIC_CLOCK-0) > 0 - return CLOCK_MONOTONIC; -#else - return CLOCK_REALTIME; -#endif -} - -bool QElapsedTimer::isMonotonic() Q_DECL_NOTHROW -{ - return clockType() == MonotonicClock; -} - -QElapsedTimer::ClockType QElapsedTimer::clockType() Q_DECL_NOTHROW -{ - return unixCheckClockType() == CLOCK_REALTIME ? SystemTime : MonotonicClock; -} - -static inline void do_gettime(qint64 *sec, qint64 *frac) -{ - timespec ts; - qt_clock_gettime(unixCheckClockType(), &ts); - *sec = ts.tv_sec; - *frac = ts.tv_nsec; -} - -// used in qcore_unix.cpp and qeventdispatcher_unix.cpp -struct timespec qt_gettime() Q_DECL_NOTHROW -{ - 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() Q_DECL_NOTHROW -{ - do_gettime(&t1, &t2); -} - -qint64 QElapsedTimer::restart() Q_DECL_NOTHROW -{ - return elapsedAndRestart(t1, t2, &t1, &t2); -} - -qint64 QElapsedTimer::nsecsElapsed() const Q_DECL_NOTHROW -{ - qint64 sec, frac; - do_gettime(&sec, &frac); - sec = sec - t1; - frac = frac - t2; - return sec * Q_INT64_C(1000000000) + frac; -} - -qint64 QElapsedTimer::elapsed() const Q_DECL_NOTHROW -{ - return nsecsElapsed() / Q_INT64_C(1000000); -} - -qint64 QElapsedTimer::msecsSinceReference() const Q_DECL_NOTHROW -{ - return t1 * Q_INT64_C(1000) + t2 / Q_INT64_C(1000000); -} - -qint64 QElapsedTimer::msecsTo(const QElapsedTimer &other) const Q_DECL_NOTHROW -{ - 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 Q_DECL_NOTHROW -{ - return other.t1 - t1; -} - -bool operator<(const QElapsedTimer &v1, const QElapsedTimer &v2) Q_DECL_NOTHROW -{ - return v1.t1 < v2.t1 || (v1.t1 == v2.t1 && v1.t2 < v2.t2); -} - -QT_END_NAMESPACE |