409 lines
9.5 KiB
C++
409 lines
9.5 KiB
C++
/**
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* vim: set ts=4 :
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* ===============================================================
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* SourceMod, Copyright (C) 2004-2007 AlliedModders LLC.
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* All rights reserved.
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* ===============================================================
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*
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* This file is part of the SourceMod/SourcePawn SDK. This file may only be
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* used or modified under the Terms and Conditions of its License Agreement,
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* which is found in public/licenses/LICENSE.txt. As of this notice, derivative
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* works must be licensed under the GNU General Public License (version 2 or
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* greater). A copy of the GPL is included under public/licenses/GPL.txt.
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*
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* To view the latest information, see: http://www.sourcemod.net/license.php
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*
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* Version: $Id$
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*/
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#ifndef _INCLUDE_SOURCEMOD_THREADER_H
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#define _INCLUDE_SOURCEMOD_THREADER_H
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/**
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* @file IThreader.h
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* @brief Contains platform independent routines for threading.
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*/
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#include <IShareSys.h>
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#define SMINTERFACE_THREADER_NAME "IThreader"
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#define SMINTERFACE_THREADER_VERSION 1
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namespace SourceMod
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{
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/**
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* @brief Thread creation flags
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*/
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enum ThreadFlags
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{
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Thread_Default = 0,
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/**
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* @brief Auto-release handle on finish
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*
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* You are not guaranteed the handle for this is valid after
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* calling MakeThread(), so never use it until OnTerminate is called.
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*/
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Thread_AutoRelease = 1,
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/**
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* @brief Thread is created "suspended", meaning it is inactive until unpaused.
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*/
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Thread_CreateSuspended = 2,
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};
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/**
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* @brief Specifies thread priority levels.
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*/
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enum ThreadPriority
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{
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ThreadPrio_Minimum = -8,
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ThreadPrio_Low = -3,
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ThreadPrio_Normal = 0,
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ThreadPrio_High = 3,
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ThreadPrio_Maximum = 8,
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};
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/**
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* @brief The current state of a thread.
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*/
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enum ThreadState
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{
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Thread_Running = 0,
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Thread_Paused = 1,
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Thread_Done = 2,
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};
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/**
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* @brief Thread-specific parameters.
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*/
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struct ThreadParams
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{
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/** Constructor */
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ThreadParams() :
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flags(Thread_Default),
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prio(ThreadPrio_Normal)
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{
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};
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ThreadFlags flags; /**< Flags to set on the thread */
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ThreadPriority prio; /**< Priority to set on the thread */
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};
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class IThreadCreator;
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/**
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* @brief Describes a handle to a thread.
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*/
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class IThreadHandle
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{
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public:
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/** Virtual destructor */
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virtual ~IThreadHandle() { };
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public:
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/**
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* @brief Pauses parent thread until this thread completes.
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*
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* @return True if successful, false otherwise.
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*/
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virtual bool WaitForThread() =0;
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/**
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* @brief Destroys the thread handle. This will not necessarily cancel the thread.
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*/
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virtual void DestroyThis() =0;
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/**
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* @brief Returns the parent threader.
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*
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* @return IThreadCreator that created this thread.
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*/
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virtual IThreadCreator *Parent() =0;
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/**
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* @brief Returns the thread states.
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*
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* @param ptparams Pointer to a ThreadParams buffer.
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*/
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virtual void GetParams(ThreadParams *ptparams) =0;
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/**
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* @brief Returns the thread priority.
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*
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* @return Thread priority.
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*/
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virtual ThreadPriority GetPriority() =0;
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/**
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* @brief Sets thread priority.
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* NOTE: On Linux, this always returns false.
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*
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* @param prio Thread priority to set.
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* @return True if successful, false otherwise.
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*/
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virtual bool SetPriority(ThreadPriority prio) =0;
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/**
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* @brief Returns the thread state.
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*
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* @return Current thread state.
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*/
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virtual ThreadState GetState() =0;
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/**
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* @brief Attempts to unpause a paused thread.
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*
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* @return True on success, false otherwise.
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*/
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virtual bool Unpause() =0;
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};
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/**
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* @brief Handles a single thread's execution.
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*/
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class IThread
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{
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public:
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/** Virtual destructor */
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virtual ~IThread() { };
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public:
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/**
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* @brief Called when the thread runs (in its own thread).
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*
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* @param pHandle Pointer to the thread's handle.
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*/
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virtual void RunThread(IThreadHandle *pHandle) =0;
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/**
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* @brief Called when the thread terminates. This occurs inside the thread as well.
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*
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* @param pHandle Pointer to the thread's handle.
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* @param cancel True if the thread did not finish, false otherwise.
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*/
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virtual void OnTerminate(IThreadHandle *pHandle, bool cancel) =0;
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};
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/**
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* @brief Describes a thread creator
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*/
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class IThreadCreator
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{
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public:
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/** Virtual Destructor */
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virtual ~IThreadCreator() { };
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public:
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/**
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* @brief Creates a basic thread.
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*
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* @param pThread IThread pointer for callbacks.
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*/
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virtual void MakeThread(IThread *pThread) =0;
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/**
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* @brief Creates a thread with specific options.
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*
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* @param pThread IThread pointer for callbacks.
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* @param flags Flags for the thread.
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* @return IThreadHandle pointer (must be released).
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*/
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virtual IThreadHandle *MakeThread(IThread *pThread, ThreadFlags flags) =0;
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/**
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* @brief Creates a thread with specific options.
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*
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* @param pThread IThread pointer for callbacks.
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* @param params Extended options for the thread.
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* @return IThreadHandle pointer (must be released).
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*/
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virtual IThreadHandle *MakeThread(IThread *pThread, const ThreadParams *params) =0;
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/**
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* @brief Returns the priority bounds.
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* Note: On Linux, the min and max are both Thread_Normal.
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*
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* @param max Stores the maximum priority level.
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* @param min Stores the minimum priority level.
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*/
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virtual void GetPriorityBounds(ThreadPriority &max, ThreadPriority &min) =0;
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};
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/**
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* @brief Describes a simple locking mutex.
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*/
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class IMutex
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{
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public:
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/** Virtual Destructor */
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virtual ~IMutex() { };
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public:
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/**
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* @brief Attempts to lock, but returns instantly.
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*
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* @return True if lock was obtained, false otherwise.
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*/
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virtual bool TryLock() =0;
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/**
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* @brief Attempts to lock by waiting for release.
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*/
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virtual void Lock() =0;
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/**
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* @brief Unlocks the mutex.
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*/
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virtual void Unlock() =0;
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/**
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* @brief Destroys the mutex handle.
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*/
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virtual void DestroyThis() =0;
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};
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/**
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* @brief Describes a simple "condition variable"/signal lock.
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*/
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class IEventSignal
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{
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public:
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/** Virtual Destructor */
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virtual ~IEventSignal() { };
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public:
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/**
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* @brief Waits for a signal.
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*/
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virtual void Wait() =0;
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/**
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* @brief Triggers the signal and resets the signal after triggering.
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*/
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virtual void Signal() =0;
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/**
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* @brief Frees the signal handle.
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*/
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virtual void DestroyThis() =0;
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};
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/**
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* @brief Describes possible worker states
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*/
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enum WorkerState
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{
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Worker_Invalid = -3,
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Worker_Stopped = -2,
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Worker_Paused = -1,
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Worker_Running,
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};
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/**
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* @brief This is a "worker pool." A single thread places tasks in a queue.
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* Each IThread is then a task, rather than its own separate thread.
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*/
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class IThreadWorker : public IThreadCreator
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{
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public:
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/** Virtual Destructor */
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virtual ~IThreadWorker()
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{
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};
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public:
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/**
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* @brief Runs one "frame" of the worker.
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*
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* @return Number of tasks processed.
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*/
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virtual unsigned int RunFrame() =0;
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public:
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/**
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* @brief Pauses the worker.
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*
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* @return True on success, false otherwise.
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*/
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virtual bool Pause() =0;
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/**
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* @brief Unpauses the worker.
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*
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* @return True on success, false otherwise.
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*/
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virtual bool Unpause() =0;
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/**
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* @brief Starts the worker thread.
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*
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* @return True on success, false otherwise.
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*/
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virtual bool Start() =0;
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/**
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* @brief Stops the worker thread.
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*
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* @param flush If true, all remaining tasks will be cancelled.
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* Otherwise, the threader will wait until the queue is empty.
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* @return True on success, false otherwise.
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*/
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virtual bool Stop(bool flush) =0;
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/**
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* @brief Returns the status of the worker.
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*
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* @param numThreads Pointer to store number of threads in the queue.
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* @return State of the worker.
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*/
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virtual WorkerState GetStatus(unsigned int *numThreads) =0;
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};
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/**
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* @brief Describes a threading system
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*/
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class IThreader : public SMInterface, public IThreadCreator
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{
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public:
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virtual const char *GetInterfaceName()
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{
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return SMINTERFACE_THREADER_NAME;
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}
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virtual unsigned int GetInterfaceVersion()
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{
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return SMINTERFACE_THREADER_VERSION;
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}
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public:
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/**
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* @brief Creates a mutex (mutual exclusion lock).
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*
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* @return A new IMutex pointer (must be destroyed).
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*/
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virtual IMutex *MakeMutex() =0;
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/**
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* @brief Sleeps the calling thread for a number of milliseconds.
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*
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* @param ms Millisecond count to sleep.
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*/
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virtual void ThreadSleep(unsigned int ms) =0;
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/**
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* @brief Creates a non-signalled event.
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*
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* @return A new IEventSignal pointer (must be destroyed).
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*/
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virtual IEventSignal *MakeEventSignal() =0;
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/**
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* @brief Creates a thread worker.
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*
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* @param threaded If true, the worker will be threaded.
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* If false, the worker will require manual frame execution.
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* @return A new IThreadWorker pointer (must be destroyed).
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*/
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virtual IThreadWorker *MakeWorker(bool threaded) =0;
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/**
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* @brief Destroys an IThreadWorker pointer.
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*
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* @param pWorker IThreadWorker pointer to destroy.
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*/
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virtual void DestroyWorker(IThreadWorker *pWorker) =0;
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};
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};
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#endif //_INCLUDE_SOURCEMOD_THREADER_H
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