C语言Windows上多线程编程入门

C语言Windows下多线程编程入门

#include <stdio.h>
#include <process.h>
#include <windows.h>

#include "base.h"

#define MAX_RETRY_COUNT 3

HANDLE workThread;
HANDLE prtThread;

void *workThrEntry(void *param);
void *prtThrEntry(void *param);

unsigned int workThrId;
unsigned int prtThrId;

BOOL isWorkThrAlive = BOOL_FALSE;//工作线程是否存活
HANDLE workThrAliveSem;//工作线程是否存活的信号量

RESULT startPrtThread();
RESULT startWorkThread();

void setWorkThrAlive(BOOL b);
BOOL getWorkThrAlive();

void main(void)
{	
	workThrAliveSem = CreateSemaphore(NULL,1,1,(LPCWSTR)"Sem for work thread alive parameter!");

	if (SUCCESS == startPrtThread())
	{
		startWorkThread();
	}
	
	WaitForSingleObject(prtThread,INFINITE);

	CloseHandle(prtThread);
	CloseHandle(workThread);
	CloseHandle(workThrAliveSem);
}

RESULT startWorkThread()
{
	workThread = (HANDLE)_beginthreadex(NULL,0,(unsigned int (_stdcall *)(void *))workThrEntry,0,0,&workThrId);
	if (NULL == workThread)
	{
		printf("ERROR: Create work thread failed!\n");
		setWorkThrAlive(BOOL_FALSE);
		return FAILURE;
	}
	else
	{
		printf("INFO: Create work thread succeed!\n");
		return SUCCESS;
	}
}

RESULT startPrtThread()
{
	prtThread = (HANDLE)_beginthreadex(NULL,0,(unsigned int(_stdcall *)(void *))prtThrEntry,0,0,&prtThrId);
	if (NULL == prtThread)
	{
		printf("ERROR: Create print thread failed!\n");
		return FAILURE;
	}
	else
	{
		printf("Info: Create print thread succeed!\n");
		return SUCCESS;
	}
}

void *workThrEntry(void *param)
{
	setWorkThrAlive(BOOL_TRUE);

	while (1)
	{
		
	}

	setWorkThrAlive(BOOL_FALSE);

	return NULL;
}

/**
 * 每秒针检测工作线程是否退出，没退出则打印相关信息。
 **/
void *prtThrEntry(void *param)
{
	int retryCount = 0;
	BOOL isFirstPrint = BOOL_TRUE;

	while (1)
	{
		if (BOOL_FALSE == getWorkThrAlive())
		{
			if (MAX_RETRY_COUNT == retryCount)
			{
				printf("INFO: The work thread has extied!\n");
				break;
			}
			else
			{
				Sleep(500);
				retryCount++;
				continue;
			}
		}

		if (BOOL_TRUE == isFirstPrint)
		{
			printf("Running...");
			isFirstPrint = BOOL_FALSE;
		}
		else
		{
			printf(".");
		}
		Sleep(500);
	}

	return NULL;
}

void setWorkThrAlive(BOOL b)
{
	WaitForSingleObject(workThrAliveSem,INFINITE);
	isWorkThrAlive = b;
	ReleaseSemaphore(workThrAliveSem,1,NULL);
}

BOOL getWorkThrAlive()
{
	BOOL b;
	WaitForSingleObject(workThrAliveSem,INFINITE);
	b = isWorkThrAlive;
	ReleaseSemaphore(workThrAliveSem,1,NULL);
	return b;
}

 

 

执行结果如下：