amxmodx/dlls/mysqlx/thread/IThreader.h

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// vim: set ts=4 sw=4 tw=99 noet:
//
// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
// Copyright (C) The AMX Mod X Development Team.
//
// This software is licensed under the GNU General Public License, version 3 or higher.
// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
// https://alliedmods.net/amxmodx-license
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#ifndef _INCLUDE_SOURCEMOD_THREADER_H
#define _INCLUDE_SOURCEMOD_THREADER_H
namespace SourceMod
{
enum ThreadFlags
{
Thread_Default = 0,
//auto release handle on finish
//you are not guaranteed the handle for this is valid after
// calling MakeThread(), so never use it until OnTerminate is called.
Thread_AutoRelease = 1,
//Thread is created "suspended", meaning
// it is inactive until unpaused.
Thread_CreateSuspended = 2,
};
enum ThreadPriority
{
ThreadPrio_Minimum = -8,
ThreadPrio_Low = -3,
ThreadPrio_Normal = 0,
ThreadPrio_High = 3,
ThreadPrio_Maximum = 8,
};
enum ThreadState
{
Thread_Running = 0,
Thread_Paused = 1,
Thread_Done = 2,
};
struct ThreadParams
{
ThreadParams() :
flags(Thread_Default),
prio(ThreadPrio_Normal)
{
};
ThreadFlags flags;
ThreadPriority prio;
};
class IThreadCreator;
/**
* Describes a handle to a thread
*/
class IThreadHandle
{
public:
virtual ~IThreadHandle() { };
public:
/**
* Pauses parent thread until this thread completes.
*/
virtual bool WaitForThread() =0;
/**
* Destroys the thread handle.
* This will not necessarily cancel the thread.
*/
virtual void DestroyThis() =0;
/**
* Returns the parent threader.
*/
virtual IThreadCreator *Parent() =0;
/**
* Returns the thread states.
*/
virtual void GetParams(ThreadParams *ptparams) =0;
/**
* Returns priority
*/
virtual ThreadPriority GetPriority() =0;
/**
* Sets thread priority
*/
virtual bool SetPriority(ThreadPriority prio) =0;
/**
* Gets thread state
*/
virtual ThreadState GetState() =0;
/**
* Attempts to unpause a paused thread.
*/
virtual bool Unpause() =0;
};
/**
* Describes a single unit of execution/context flow
*/
class IThread
{
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public:
virtual ~IThread() { };
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public:
//Called when the thread runs
virtual void RunThread(IThreadHandle *pHandle) =0;
//Called when the thread terminates.
//"Cancel" is true if the thread did not finish
//(this could mean suspended or terminated abruptly)
virtual void OnTerminate(IThreadHandle *pHandle, bool cancel) =0;
};
/**
* Describes a thread creator
*/
class IThreadCreator
{
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public:
virtual ~IThreadCreator() { };
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public:
//Makes a thread and cleans up the handle for you
virtual void MakeThread(IThread *pThread) =0;
//Makes a thread with flag specified
virtual IThreadHandle *MakeThread(IThread *pThread, ThreadFlags flags) =0;
//Makes a thread, full options can be specified
virtual IThreadHandle *MakeThread(IThread *pThread, const ThreadParams *params) =0;
//Return priority bounds
virtual void GetPriorityBounds(ThreadPriority &max, ThreadPriority &min) =0;
};
/**
* Basic Mutex
*/
class IMutex
{
public:
virtual ~IMutex() { };
public:
/**
* Attempts to lock, but returns instantly.
*/
virtual bool TryLock() =0;
/**
* Attempts to lock by waiting for release.
*/
virtual void Lock() =0;
/**
* Unlocks mutex.
*/
virtual void Unlock() =0;
/**
* Frees the mutex handle.
*/
virtual void DestroyThis() =0;
};
class IEventSignal
{
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public:
virtual ~IEventSignal() { };
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public:
/**
* Waits for the signal.
*/
virtual void Wait() =0;
/**
* Triggers the signal.
* Resets the signals after triggering.
*/
virtual void Signal() =0;
/**
* Frees the signal handle.
*/
virtual void DestroyThis() =0;
};
/**
* Describes a threading system
*/
class IThreader : public IThreadCreator
{
public:
virtual IMutex *MakeMutex() =0;
virtual void MakeThread(IThread *pThread) =0;
virtual IThreadHandle *MakeThread(IThread *pThread, ThreadFlags flags) =0;
virtual IThreadHandle *MakeThread(IThread *pThread, const ThreadParams *params) =0;
virtual void GetPriorityBounds(ThreadPriority &max, ThreadPriority &min) =0;
virtual void ThreadSleep(unsigned int ms) =0;
/**
* Creates a non-signalled event.
*/
virtual IEventSignal *MakeEventSignal() =0;
};
enum WorkerState
{
Worker_Invalid = -3,
Worker_Stopped = -2,
Worker_Paused = -1,
Worker_Running,
};
/**
* This is an extension of the threader that is implemented.
* It "simulates" threading in a queue, and processes the queue whenever
* RunFrame is called (leaving it up to the implementation).
* Worker may or may not be started upon instantiation.
*/
class IWorker : public IThreadCreator
{
public:
virtual unsigned int RunFrame() =0;
virtual void MakeThread(IThread *pThread) =0;
virtual IThreadHandle *MakeThread(IThread *pThread, ThreadFlags flags) =0;
virtual IThreadHandle *MakeThread(IThread *pThread, const ThreadParams *params) =0;
virtual void GetPriorityBounds(ThreadPriority &max, ThreadPriority &min) =0;
public:
//Controls the worker
virtual bool Pause() =0;
virtual bool Unpause() =0;
virtual bool Start() =0;
//If flush is true, all remaining tasks will be cancelled.
//Otherwise, it will wait until the tasks have been depleted, then
// end.
virtual bool Stop(bool flush_cancel) =0;
//Flushes out any remaining threads
virtual unsigned int Flush(bool flush_cancel) =0;
//returns status and number of threads in queue
virtual WorkerState GetStatus(unsigned int *numThreads) =0;
};
};
#endif //_INCLUDE_SOURCEMOD_THREADER_H