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Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qperformancetimer_p.h" #if defined(Q_OS_MAC) #include #include #include #elif defined(Q_OS_UNIX) #include #include #include #elif defined(Q_OS_WIN) #include #endif // mac/unix code heavily copied from QElapsedTimer QT_BEGIN_NAMESPACE ////////////////////////////// Mac ////////////////////////////// #if defined(Q_OS_MAC) static mach_timebase_info_data_t info = {0,0}; static qint64 absoluteToNSecs(qint64 cpuTime) { if (info.denom == 0) mach_timebase_info(&info); qint64 nsecs = cpuTime * info.numer / info.denom; return nsecs; } void QPerformanceTimer::start() { t1 = mach_absolute_time(); } qint64 QPerformanceTimer::elapsed() const { qint64 cpu_time = mach_absolute_time(); return absoluteToNSecs(cpu_time - t1); } // return number of nsecs elapsed from timer start time till absoluteMonotonicTimeNs // elapsedToAbsoluteTime(0) returns negative value of absolute time (ns) when the timer was started qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const { qint64 absolute_t1_ns = absoluteToNSecs(t1); return absoluteMonotonicTimeNs - absolute_t1_ns; } ////////////////////////////// Unix ////////////////////////////// #elif defined(Q_OS_UNIX) #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 #if (_POSIX_MONOTONIC_CLOCK-0 != 0) static const bool monotonicClockChecked = true; static const bool monotonicClockAvailable = _POSIX_MONOTONIC_CLOCK > 0; #else static int monotonicClockChecked = false; static int monotonicClockAvailable = false; #endif #ifdef Q_CC_GNU # define is_likely(x) __builtin_expect((x), 1) #else # define is_likely(x) (x) #endif #define load_acquire(x) ((volatile const int&)(x)) #define store_release(x,v) ((volatile int&)(x) = (v)) static void unixCheckClockType() { #if (_POSIX_MONOTONIC_CLOCK-0 == 0) if (is_likely(load_acquire(monotonicClockChecked))) return; # if defined(_SC_MONOTONIC_CLOCK) // detect if the system support monotonic timers long x = sysconf(_SC_MONOTONIC_CLOCK); store_release(monotonicClockAvailable, x >= 200112L); # endif store_release(monotonicClockChecked, true); #endif } static inline void do_gettime(qint64 *sec, qint64 *frac) { #if (_POSIX_MONOTONIC_CLOCK-0 >= 0) unixCheckClockType(); if (is_likely(monotonicClockAvailable)) { timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); *sec = ts.tv_sec; *frac = ts.tv_nsec; return; } #endif *sec = 0; *frac = 0; } void QPerformanceTimer::start() { do_gettime(&t1, &t2); } qint64 QPerformanceTimer::elapsed() const { qint64 sec, frac; do_gettime(&sec, &frac); sec = sec - t1; frac = frac - t2; return sec * Q_INT64_C(1000000000) + frac; } qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const { qint64 sec = absoluteMonotonicTimeNs / Q_INT64_C(1000000000); qint64 frac = absoluteMonotonicTimeNs % Q_INT64_C(1000000000); sec = sec - t1; frac = frac - t2; return sec * Q_INT64_C(1000000000) + frac; } ////////////////////////////// Windows ////////////////////////////// #elif defined(Q_OS_WIN) static qint64 getTimeFromTick(quint64 elapsed) { static LARGE_INTEGER freq; if (!freq.QuadPart) QueryPerformanceFrequency(&freq); return 1000000000 * elapsed / freq.QuadPart; } void QPerformanceTimer::start() { LARGE_INTEGER li; QueryPerformanceCounter(&li); t1 = li.QuadPart; } qint64 QPerformanceTimer::elapsed() const { LARGE_INTEGER li; QueryPerformanceCounter(&li); return getTimeFromTick(li.QuadPart - t1); } qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const { qint64 absolute_t1_ns = getTimeFromTick(t1); return absoluteMonotonicTimeNs - absolute_t1_ns; } ////////////////////////////// Default ////////////////////////////// #else // default implementation (no hi-perf timer) does nothing void QPerformanceTimer::start() { } qint64 QPerformanceTimer::elapsed() const { return 0; } qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const { Q_UNUSED(absoluteMonotonicTimeNs); return 0; } #endif QT_END_NAMESPACE