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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /include/vcl/TaskStopwatch.hxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/vcl/TaskStopwatch.hxx')
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diff --git a/include/vcl/TaskStopwatch.hxx b/include/vcl/TaskStopwatch.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_TASK_STOPWATCH_HXX
+#define INCLUDED_VCL_TASK_STOPWATCH_HXX
+
+#include <tools/time.hxx>
+#include <vcl/dllapi.h>
+#include <vcl/inputtypes.hxx>
+#include <vcl/svapp.hxx>
+
+/**
+ * Helper class primary used to track time of long running iterating tasks.
+ *
+ * Normally it should be sufficient to instantiate the watch object before
+ * starting the iteration and query continueIter() at the end of each.
+ *
+ * Called Stopwatch, because there is already a Timer class in the Scheduler.
+ *
+ * TODO: merge into the general Scheduler, so this can also be used to track
+ * Task runtimes in a more general way.
+ * TODO: handle fast iterations, where continueIter is called multiple times
+ * per tick, by counting the iterations per tick and use that for approximation.
+ **/
+class VCL_DLLPUBLIC TaskStopwatch
+{
+ static constexpr VclInputFlags eDefaultInputStop = VCL_INPUT_ANY & ~VclInputFlags::TIMER;
+ static constexpr unsigned int nDefaultTimeSlice = 50;
+ static unsigned int m_nTimeSlice;
+
+ sal_uInt64 m_nStartTicks;
+ sal_uInt64 m_nIterStartTicks;
+ bool m_bConsiderLastIterTime;
+ VclInputFlags m_eInputStop;
+
+ bool nextIter()
+ {
+ sal_uInt64 nCurTicks = tools::Time::GetSystemTicks();
+ // handle system ticks wrap as exceeded time slice
+ if (nCurTicks < m_nStartTicks)
+ return false;
+
+ if (m_bConsiderLastIterTime)
+ {
+ // based on the last iter runtime, we don't expect to finish in time
+ // m_nTimeSlice < (nCurTicks - m_nStartTicks) + (nCurTicks - m_nIterStartTicks)
+ if (m_nTimeSlice < 2 * nCurTicks - m_nIterStartTicks - m_nStartTicks)
+ return false;
+ }
+ // time slice exceeded
+ else if (m_nTimeSlice < nCurTicks - m_nStartTicks)
+ return false;
+
+ m_nIterStartTicks = nCurTicks;
+
+ return !Application::AnyInput(m_eInputStop);
+ }
+
+public:
+ /**
+ * Per default the watch considers the last iter time when asking for an
+ * other iteration, so considers Scheduler::acceptableTaskTime as a
+ * maximum value.
+ *
+ * If you already know your iter time vary in a large range, consider
+ * setting bConciderLastIterTime to false, so Scheduler::acceptableTaskTime
+ * will be used as a minimum time slot.
+ **/
+ TaskStopwatch(bool bConciderLastIterTime = true)
+ : m_nStartTicks(tools::Time::GetSystemTicks())
+ , m_nIterStartTicks(m_nStartTicks)
+ , m_bConsiderLastIterTime(bConciderLastIterTime)
+ , m_eInputStop(eDefaultInputStop)
+ {
+ }
+
+ /**
+ * Returns true, if another iteration will probably pass in the time slot
+ **/
+ bool continueIter() { return nextIter(); }
+
+ /**
+ * Reset the stopwatch
+ **/
+ void reset()
+ {
+ m_nStartTicks = tools::Time::GetSystemTicks();
+ m_nIterStartTicks = m_nStartTicks;
+ }
+
+ /**
+ * Sets the input events, which should also "exceed" the stopwatch.
+ *
+ * Per default this ignores the VclInputFlags::TIMER.
+ */
+ void setInputStop(VclInputFlags eInputStop = eDefaultInputStop) { m_eInputStop = eInputStop; }
+ VclInputFlags inputStop() const { return m_eInputStop; }
+
+ /**
+ * Sets the time considered the acceptable maximum for a task to run
+ *
+ * This is an orientation for long time background jobs to yield to
+ * the scheduler, so Idle task don't starve each other too much.
+ **/
+ static unsigned int timeSlice() { return m_nTimeSlice; }
+ static void setTimeSlice(unsigned int nTimeSlice) { m_nTimeSlice = nTimeSlice; }
+};
+
+#endif // INCLUDED_VCL_TASK_STOPWATCH_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */