Win32 Thread Pool code (winapi/c++)

Source: Internet
Author: User

Win32 Thread Pool code (winapi/c++)

Robust, efficient, easy to use, easy to expand, can be used with any C + + compiler
Description, this code I used for a long time, I deleted the automatic sizing code (because he is not mature)
/******************************************************************
* Thread Pool for Win32
* VC + + 6, bc++ 5.5 (free), GCC (free)
* update:2004.6.9 Llbird [email protected]

Use:
1):
void ThreadFunc (void *p)
{
//...
}
ThreadPool TP;
for (i=0; i<100; i++)
Tp. Call (ThreadFunc);

ThreadPool TP (20);//20 is the initial thread pool size
Tp. Call (ThreadFunc, Lppara);
Tp. Adjustsize (50);//Increase 50
Tp. Adjustsize (-30);//Decrease by 30


2):
Class Mythreadjob:public Threadjob//Thread object extended from Threadjob
{
Public
virtual void dojob (void *p)//Custom virtual function
{
//....
}
};
Mythreadjob MT[10];
ThreadPool TP;
for (i=0; i<100 i++)
Tp. Call (Mt + i);//tp. Call (Mt + I, para);

*******************************************************************/
#ifndef _threadpool_h_
#define _threadpool_h_

#pragma warning (disable:4530)
#pragma warning (disable:4786)

#include <cassert>
#include <vector>
#include <queue>
#include <windows.h>


Class Threadjob//working base classes
{
Public
virtual function for thread pool invocation
virtual void dojob (void *ppara) = 0;
};

Class ThreadPool
{

Public
Dwnum Thread pool Size
ThreadPool (DWORD dwnum = 4): _lthreadnum (0), _lrunningnum (0)
{
InitializeCriticalSection (&_csthreadvector);
InitializeCriticalSection (&_csworkqueue);

_eventcomplete = CreateEvent (0, False, False, NULL);
_eventend = CreateEvent (0, True, false, NULL);
_semaphorecall = CreateSemaphore (0, 0, 0x7FFFFFFF, NULL);
_semaphoredel = CreateSemaphore (0, 0, 0x7FFFFFFF, NULL);

ASSERT (_semaphorecall! = INVALID_HANDLE_VALUE);
ASSERT (_eventcomplete! = INVALID_HANDLE_VALUE);
ASSERT (_eventend! = INVALID_HANDLE_VALUE);
ASSERT (_semaphoredel! = INVALID_HANDLE_VALUE);

Adjustsize (dwnum <= 0 4:dwnum);
}

~threadpool ()
{
DeleteCriticalSection (&_csworkqueue);

CloseHandle (_eventend);
CloseHandle (_eventcomplete);
CloseHandle (_semaphorecall);
CloseHandle (_semaphoredel);

Vector<threaditem*>::iterator ITER;
for (iter = _threadvector.begin (); ITER! = _threadvector.end (); iter++)
{
if (*iter)
Delete *iter;
}

DeleteCriticalSection (&_csthreadvector);
}
Adjust thread pool Size
int adjustsize (int iNum)
{
if (INum > 0)
{
Threaditem *pnew;
EnterCriticalSection (&_csthreadvector);
for (int _i=0; _i<inum; _i++)
{
_threadvector.push_back (pnew = new Threaditem (this));
ASSERT (Pnew);
Pnew->_handle = CreateThread (NULL, 0, Defaultjobproc, pnew, 0, NULL);
ASSERT (Pnew->_handle);
}
LeaveCriticalSection (&_csthreadvector);
}
Else
{
INum *=-1;
ReleaseSemaphore (_semaphoredel, INum > _lthreadnum _lthreadnum:inum, NULL);
}
return (int) _lthreadnum;
}
Call Thread pool
void Call (void (*PFUNC) (void *), void *ppara = NULL)
{
ASSERT (PFunc);

EnterCriticalSection (&_csworkqueue);
_jobqueue.push (New Jobitem (PFunc, Ppara));
LeaveCriticalSection (&_csworkqueue);

ReleaseSemaphore (_semaphorecall, 1, NULL);
}
Call Thread pool
inline void Call (Threadjob * p, void *ppara = NULL)
{
Call (Callproc, New Callprocpara (P, Ppara));
}
End the thread pool and wait synchronously
BOOL Endandwait (DWORD dwwaittime = INFINITE)
{
SetEvent (_eventend);
Return WaitForSingleObject (_eventcomplete, dwwaittime) = = Wait_object_0;
}
End thread Pool
inline void End ()
{
SetEvent (_eventend);
}
Inline DWORD Size ()
{
Return (DWORD) _lthreadnum;
}
Inline DWORD getrunningsize ()
{
Return (DWORD) _lrunningnum;
}
BOOL IsRunning ()
{
return _lrunningnum > 0;
}

Protected

Worker threads
Static DWORD WINAPI Defaultjobproc (lpvoid lpparameter = NULL)
{
Threaditem *pthread = static_cast<threaditem*> (Lpparameter);
ASSERT (PThread);

ThreadPool *pthreadpoolobj = pthread->_pthis;
ASSERT (Pthreadpoolobj);

InterlockedIncrement (&pthreadpoolobj->_lthreadnum);

HANDLE Hwaithandle[3];
Hwaithandle[0] = pthreadpoolobj->_semaphorecall;
HWAITHANDLE[1] = pthreadpoolobj->_semaphoredel;
HWAITHANDLE[2] = pthreadpoolobj->_eventend;

Jobitem *pjob;
BOOL Fhasjob;

for (;;)
{
DWORD WR = WaitForMultipleObjects (3, Hwaithandle, False, INFINITE);

Responding to deleting a thread signal
if (WR = = wait_object_0 + 1)
Break

Get user jobs from the queue
EnterCriticalSection (&pthreadpoolobj->_csworkqueue);
if (Fhasjob =!pthreadpoolobj->_jobqueue.empty ())
{
Pjob = Pthreadpoolobj->_jobqueue.front ();
Pthreadpoolobj->_jobqueue.pop ();
ASSERT (Pjob);
}
LeaveCriticalSection (&pthreadpoolobj->_csworkqueue);

Be signaled by the end thread to determine whether to end the thread (end thread signal && whether there is still work)
if (WR = = Wait_object_0 + 2 &&!fhasjob)
Break

if (fhasjob && pjob)
{
InterlockedIncrement (&pthreadpoolobj->_lrunningnum);
Pthread->_dwlastbegintime = GetTickCount ();
pthread->_dwcount++;
Pthread->_fisrunning = true;
Pjob->_pfunc (Pjob->_ppara); Run User jobs
Delete Pjob;
Pthread->_fisrunning = false;
InterlockedDecrement (&pthreadpoolobj->_lrunningnum);
}
}

Delete Self structure
EnterCriticalSection (&pthreadpoolobj->_csthreadvector);
Pthreadpoolobj->_threadvector.erase (Find (Pthreadpoolobj->_threadvector.begin (), pThreadPoolObj->_ Threadvector.end (), pThread));
LeaveCriticalSection (&pthreadpoolobj->_csthreadvector);

Delete PThread;

InterlockedDecrement (&pthreadpoolobj->_lthreadnum);

if (!pthreadpoolobj->_lthreadnum)//end of all threads
SetEvent (Pthreadpoolobj->_eventcomplete);

return 0;
}
Calling the User object virtual function
static void Callproc (void *ppara)
{
Callprocpara *CP = Static_cast<callprocpara *> (Ppara);
ASSERT (CP);
if (CP)
{
Cp->_pobj->dojob (Cp->_ppara);
Delete cp;
}
}
User Object structure
struct Callprocpara
{
threadjob* _pobj;//User Objects
void *_ppara;//User Parameters
Callprocpara (threadjob* p, void *ppara): _pobj (P), _ppara (Ppara) {};
};
User function structure
struct Jobitem
{
void (*_pfunc) (void *);//function
void *_ppara; Parameters
Jobitem (void (*PFUNC) (void *) = null, void *ppara = null): _pfunc (PFunc), _ppara (Ppara) {};
};
Thread structure in a thread pool
struct Threaditem
{
HANDLE _handle; Thread handle
ThreadPool *_pthis; Pointer to the thread pool
DWORD _dwlastbegintime; Last Run Start time
DWORD _dwcount; Number of runs
BOOL _fisrunning;
Threaditem (ThreadPool *pthis): _pthis (pthis), _handle (NULL), _dwlastbegintime (0), _dwcount (0), _fisrunning (false) {};
~threaditem ()
{
if (_handle)
{
CloseHandle (_handle);
_handle = NULL;
}
}
};

Std::queue<jobitem *> _jobqueue; Work queue
Std::vector<threaditem *> _threadvector; Thread data

critical_section _csthreadvector, _csworkqueue; Work queue criticality, thread data criticality

HANDLE _eventend, _eventcomplete, _semaphorecall, _semaphoredel;//end notification, complete event, work signal, delete thread signal
Long _lthreadnum, _lrunningnum; Number of threads, number of threads running

};

#endif//_threadpool_h_

Win32 Thread Pool code (winapi/c++)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.