c语言线程的开启函数 C语言线程函数

请问用C语言在windows上建立多线程需要用什么函数最好,

#includewindows.h

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#includefstream.h

#includestdio.h

#includestring

#includeconio.h

//定义一些常量;

//本程序允许的最大临界区数;

#define MAX_BUFFER_NUM 10

//秒到微秒的乘法因子;

#define INTE_PER_SEC 1000

//本程序允许的生产和消费线程的总数;

#define MAX_THREAD_NUM 64

//定义一个结构,记录在测试文件中指定的每一个线程的参数

struct ThreadInfo

{

int serial; //线程序列号

char entity; //是P还是C

double delay; //线程延迟

int thread_request[MAX_THREAD_NUM]; //线程请求队列

int n_request; //请求个数

};

//全局变量的定义

//临界区对象的声明,用于管理缓冲区的互斥访问;

CRITICAL_SECTION PC_Critical[MAX_BUFFER_NUM];

int Buffer_Critical[MAX_BUFFER_NUM]; //缓冲区声明,用于存放产品;

HANDLE h_Thread[MAX_THREAD_NUM]; //用于存储每个线程句柄的数组;

ThreadInfo Thread_Info[MAX_THREAD_NUM]; //线程信息数组;

HANDLE empty_semaphore; //一个信号量;

HANDLE h_mutex; //一个互斥量;

DWORD n_Thread = 0; //实际的线程的数目;

DWORD n_Buffer_or_Critical; //实际的缓冲区或者临界区的数目;

HANDLE h_Semaphore[MAX_THREAD_NUM]; //生产者允许消费者开始消费的信号量;

//生产消费及辅助函数的声明

void Produce(void *p);

void Consume(void *p);

bool IfInOtherRequest(int);

int FindProducePositon();

int FindBufferPosition(int);

int main(void)

{

//声明所需变量;

DWORD wait_for_all;

ifstream inFile;

//初始化缓冲区;

for(int i=0;i MAX_BUFFER_NUM;i++)

Buffer_Critical[i] = -1;

//初始化每个线程的请求队列;

for(int j=0;jMAX_THREAD_NUM;j++){

for(int k=0;kMAX_THREAD_NUM;k++)

Thread_Info[j].thread_request[k] = -1;

Thread_Info[j].n_request = 0;

}

//初始化临界区;

for(i =0;i MAX_BUFFER_NUM;i++)

InitializeCriticalSection(PC_Critical[i]);

//打开输入文件,按照规定的格式提取线程等信息;

inFile.open("test.txt");

//从文件中获得实际的缓冲区的数目;

inFile n_Buffer_or_Critical;

inFile.get();

printf("输入文件是:\n");

//回显获得的缓冲区的数目信息;

printf("%d \n",(int) n_Buffer_or_Critical);

//提取每个线程的信息到相应数据结构中;

while(inFile){

inFile Thread_Info[n_Thread].serial;

inFile Thread_Info[n_Thread].entity;

inFile Thread_Info[n_Thread].delay;

char c;

inFile.get(c);

while(c!='\n' !inFile.eof()){

inFile Thread_Info[n_Thread].thread_request[Thread_Info[n_Thread].n_request++];

inFile.get(c);

}

n_Thread++;

}

//回显获得的线程信息,便于确认正确性;

for(j=0;j(int) n_Thread;j++){

int Temp_serial = Thread_Info[j].serial;

char Temp_entity = Thread_Info[j].entity;

double Temp_delay = Thread_Info[j].delay;

printf(" \n thread%2d %c %f ",Temp_serial,Temp_entity,Temp_delay);

int Temp_request = Thread_Info[j].n_request;

for(int k=0;kTemp_request;k++)

printf(" %d ", Thread_Info[j].thread_request[k]);

coutendl;

}

printf("\n\n");

//创建在模拟过程中几个必要的信号量

empty_semaphore=CreateSemaphore(NULL,n_Buffer_or_Critical,n_Buffer_or_Critical,

"semaphore_for_empty");

h_mutex = CreateMutex(NULL,FALSE,"mutex_for_update");

//下面这个循环用线程的ID号来为相应生产线程的产品读写时所

//使用的同步信号量命名;

for(j=0;j(int)n_Thread;j++){

std::string lp ="semaphore_for_produce_";

int temp =j;

while(temp){

char c = (char)(temp%10);

lp+=c;

temp/=10;

}

h_Semaphore[j+1]=CreateSemaphore(NULL,0,n_Thread,lp.c_str());

}

//创建生产者和消费者线程;

for(i =0;i (int) n_Thread;i++){

if(Thread_Info[i].entity =='P')

h_Thread[i]= CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(Produce),

(Thread_Info[i]),0,NULL);

else

h_Thread[i]=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(Consume),

(Thread_Info[i]),0,NULL);

}

//主程序等待各个线程的动作结束;

wait_for_all = WaitForMultipleObjects(n_Thread,h_Thread,TRUE,-1);

printf(" \n \nALL Producer and consumer have finished their work. \n");

printf("Press any key to quit!\n");

_getch();

return 0;

}

//确认是否还有对同一产品的消费请求未执行;

bool IfInOtherRequest(int req)

{

for(int i=0;in_Thread;i++)

for(int j=0;jThread_Info[i].n_request;j++)

if(Thread_Info[i].thread_request[j] == req)

return TRUE;

return FALSE;

}

//找出当前可以进行产品生产的空缓冲区位置;

int FindProducePosition()

{

int EmptyPosition;

for (int i =0;in_Buffer_or_Critical;i++)

if(Buffer_Critical[i] == -1){

EmptyPosition = i;

//用下面这个特殊值表示本缓冲区正处于被写状态;

Buffer_Critical[i] = -2;

break;

}

return EmptyPosition;

}

//找出当前所需生产者生产的产品的位置;

int FindBufferPosition(int ProPos)

{

int TempPos;

for (int i =0 ;in_Buffer_or_Critical;i++)

if(Buffer_Critical[i]==ProPos){

TempPos = i;

break;

}

return TempPos;

}

//生产者进程

void Produce(void *p)

{

//局部变量声明;

DWORD wait_for_semaphore,wait_for_mutex,m_delay;

int m_serial;

//获得本线程的信息;

m_serial = ((ThreadInfo*)(p))-serial;

m_delay = (DWORD)(((ThreadInfo*)(p))-delay *INTE_PER_SEC);

Sleep(m_delay);

//开始请求生产

printf("Producer %2d sends the produce require.\n",m_serial);

//确认有空缓冲区可供生产,同时将空位置数empty减1;用于生产者和消费者的同步;

wait_for_semaphore = WaitForSingleObject(empty_semaphore,-1);

//互斥访问下一个可用于生产的空临界区,实现写写互斥;

wait_for_mutex = WaitForSingleObject(h_mutex,-1);

int ProducePos = FindProducePosition();

ReleaseMutex(h_mutex);

//生产者在获得自己的空位置并做上标记后,以下的写操作在生产者之间可以并发;

//核心生产步骤中,程序将生产者的ID作为产品编号放入,方便消费者识别;

printf("Producer %2d begin to produce at position %2d.\n",m_serial,ProducePos);

Buffer_Critical[ProducePos] = m_serial;

printf("Producer %2d finish producing :\n ",m_serial);

printf(" position[ %2d ]:%3d \n" ,ProducePos,Buffer_Critical[ProducePos]);

//使生产者写的缓冲区可以被多个消费者使用,实现读写同步;

ReleaseSemaphore(h_Semaphore[m_serial],n_Thread,NULL);

}

//消费者进程

void Consume(void * p)

{

//局部变量声明;

DWORD wait_for_semaphore,m_delay;

int m_serial,m_requestNum; //消费者的序列号和请求的数目;

int m_thread_request[MAX_THREAD_NUM];//本消费线程的请求队列;

//提取本线程的信息到本地;

m_serial = ((ThreadInfo*)(p))-serial;

m_delay = (DWORD)(((ThreadInfo*)(p))-delay *INTE_PER_SEC);

m_requestNum = ((ThreadInfo *)(p))-n_request;

for (int i = 0;im_requestNum;i++)

m_thread_request[i] = ((ThreadInfo*)(p))-thread_request[i];

Sleep(m_delay);

//循环进行所需产品的消费

for(i =0;im_requestNum;i++){

//请求消费下一个产品

printf("Consumer %2d request to consume %2d product\n",m_serial,m_thread_request[i]);

//如果对应生产者没有生产,则等待;如果生产了,允许的消费者数目-1;实现了读写同步;

wait_for_semaphore=WaitForSingleObject(h_Semaphore[m_thread_request[i]],-1);

//查询所需产品放到缓冲区的号

int BufferPos=FindBufferPosition(m_thread_request[i]);

//开始进行具体缓冲区的消费处理,读和读在该缓冲区上仍然是互斥的;

//进入临界区后执行消费动作;并在完成此次请求后,通知另外的消费者本处请求已

//经满足;同时如果对应的产品使用完毕,就做相应处理;并给出相应动作的界面提

//示;该相应处理指将相应缓冲区清空,并增加代表空缓冲区的信号量;

EnterCriticalSection(PC_Critical[BufferPos]);

printf("Consumer%2d begin to consume %2d product \n",m_serial,m_thread_request[i]);

((ThreadInfo*)(p))-thread_request[i] =-1;

if(!IfInOtherRequest(m_thread_request[i])){

Buffer_Critical[BufferPos] = -1;//标记缓冲区为空;

printf("Consumer%2d finish consuming %2d:\n ",m_serial,m_thread_request[i]);

printf(" position[ %2d ]:%3d \n" ,BufferPos,Buffer_Critical[BufferPos]);

ReleaseSemaphore(empty_semaphore,1,NULL);

}

else{

printf("Consumer %2d finish consuming product %2d\n ",m_serial,m_thread_request[i]);

}

//离开临界区

LeaveCriticalSection(PC_Critical[BufferPos]);

}

}

看函数就行

c语言怎么创建线程和使用

用 pthread_t创建线程名字。然后pthread_create开辟线程。

具体使用。

比如有一个函数

void *hello()

{

printf("create pthread!\n");

}

,然后在main函数里面调用,

int main()

{

pthread_t a_thread;

pthread_create(a_thread, NULL, (void *)hello, NULL);

}

这样就完成了hello()函数的创建和使用,接下来hello函数就会在一个线程中运行

linux C语言 makefile编译、关闭线程、开启线程怎么做?

线程跟makefile没有关系

用fork或者pthread_* api来使用进程和线程

C语言线程函数参数问题

·线程创建

函数原型:int pthread_create(pthread_t *restrict tidp,const pthread_attr_t *restrict attr,void *(*start_rtn)(void),void *restrict arg);

返回值:若是成功建立线程返回0,否则返回错误的编号。

形式参数:pthread_t *restrict tidp要创建的线程的线程id指针;

const pthread_attr_t *restrict attr创建线程时的线程属性;

void* (start_rtn)(void)返回值是void类型的指针函数;

void *restrict arg start_rtn的形参。 =====这个地方就可以传参数,

注意,这个地方是个指针,要想传多个参数,可以定义一个结构体,把要传的参数包起来,传结构体的地址就ok

C语言里面怎么开启线程啊,忘记了? 求解答

int pthread_create(pthread_t *tidp,const pthread_attr_t *attr,

(void*)(*start_rtn)(void*),void *arg);


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