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Diffstat (limited to '')
| -rw-r--r-- | include/vcl/task.hxx | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/include/vcl/task.hxx b/include/vcl/task.hxx new file mode 100644 index 000000000..35efe4825 --- /dev/null +++ b/include/vcl/task.hxx @@ -0,0 +1,104 @@ +/* -*- 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_VCL_TASK_HXX +#define INCLUDED_VCL_TASK_HXX + +#include <vcl/dllapi.h> + +struct ImplSchedulerData; + +enum class TaskPriority +{ + HIGHEST, ///< These events should run very fast! + DEFAULT, ///< Default priority used, e.g. the default timer priority + HIGH_IDLE, ///< Important idle events to be run before processing drawing events + RESIZE, ///< Resize runs before repaint, so we won't paint twice + REPAINT, ///< All repaint events should go in here + POST_PAINT, ///< Everything running directly after painting + DEFAULT_IDLE, ///< Default idle priority + LOWEST ///< Low, very idle cleanup tasks +}; + +#define PRIO_COUNT (static_cast<int>(TaskPriority::LOWEST) + 1) + +class VCL_DLLPUBLIC Task +{ + friend class Scheduler; + friend struct ImplSchedulerData; + + ImplSchedulerData *mpSchedulerData; ///< Pointer to the element in scheduler list + const char *mpDebugName; ///< Useful for debugging + TaskPriority mePriority; ///< Task priority + bool mbActive; ///< Currently in the scheduler + bool mbStatic; ///< Is a static object + +protected: + static void StartTimer( sal_uInt64 nMS ); + + const ImplSchedulerData* GetSchedulerData() const { return mpSchedulerData; } + + virtual void SetDeletionFlags(); + + /** + * How long (in MS) until the Task is ready to be dispatched? + * + * Simply return Scheduler::ImmediateTimeoutMs if you're ready, like an + * Idle. If you have to return Scheduler::InfiniteTimeoutMs, you probably + * need another mechanism to wake up the Scheduler or rely on other + * Tasks to be scheduled, or simply use a polling Timer. + * + * @param nTimeNow the current time + * @return the sleep time of the Task to become ready + */ + virtual sal_uInt64 UpdateMinPeriod( sal_uInt64 nTimeNow ) const = 0; + +public: + Task( const char *pDebugName ); + Task( const Task& rTask ); + virtual ~Task() COVERITY_NOEXCEPT_FALSE; + Task& operator=( const Task& rTask ); + + void SetPriority(TaskPriority ePriority); + TaskPriority GetPriority() const { return mePriority; } + + void SetDebugName( const char *pDebugName ) { mpDebugName = pDebugName; } + const char *GetDebugName() const { return mpDebugName; } + + // Call handler + virtual void Invoke() = 0; + + virtual void Start(); + void Stop(); + + bool IsActive() const { return mbActive; } + + /** + * This function must be called for static tasks, so the Task destructor + * ignores the SchedulerMutex, as it may not be available anymore. + * The cleanup is still correct, as it has already happened in + * DeInitScheduler call well before the static destructor calls. + */ + void SetStatic() { mbStatic = true; } + bool IsStatic() const { return mbStatic; } +}; + +#endif // INCLUDED_VCL_TASK_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |