线程的创建及运行

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>	
void* thread_main(void*);

int main()
{
	pthread_t t_id;
	int thread_param=5;

	if(pthread_create(&t_id,NULL,thread_main,&thread_param)!=0)
	{
		puts("pthread_create() error\n");
		return -1;
	}
	sleep(2);
	puts("end of main");
	return 0;
}

void* thread_main(void* arg)
{
	int i;
	int cnt=*((int*)arg);	//转换
	for(i=0;i<cnt;++i)
	{
		sleep(1);
		puts("running thread");
	}
	
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
void* thread_main(void*);

int main()
{
	pthread_t t_id;
	int thread_param=5;
	void* thr_ret;

	if(pthread_create(&t_id,NULL,thread_main,(void*)&thread_param)!=0)
	{
		puts("pthread_create error");
		return -1;
	}
//调试语句
//	printf("创建线程的ID:%lud\n",(long unsigned int)t_id);
	
	if(pthread_join(t_id,&thr_ret)!=0)
	{
		puts("pthread_join error");
		return -1;
	}

	printf("Thread return message: %s \n",(char*)thr_ret);
	free(thr_ret);
	return 0;
}

void *thread_main(void *arg)
{
	int i;
	int cnt=*((int*)arg);	//强制转换
	char *msg=(char *)malloc(sizeof(char)*50);
	strcpy(msg,"Hello,I'am thread~\n");
	
	for(i=0;i<cnt;++i)
	{
		sleep(1);
		puts("running thread");
	}
	return (void*)msg;
}

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

int sum=0;
void *summation(void *arg)
{
	int start=((int*)arg)[0];
	int end=((int*)arg)[1];
	while(start<=end)
	{
		sum+=start;
		++start;
	}
	return NULL;
}

int main()
{
	pthread_t id_t1,id_t2;	//保存线程ID
	int range1[]={1,5};
	int range2[]={6,10};

	pthread_create(&id_t1,NULL,summation,(void*)range1);	//创建线程1
//调试语句
	printf("sum:%d\n",sum);
	pthread_create(&id_t2,NULL,summation,(void*)range2);	//创建线程2
//调试语句
	printf("sum:%d\n",sum);

//	pthread_join(id_t1,NULL);	//等待线程id_t1终止
//	pthread_join(id_t2,NULL);	//等待线程id_t2终止

//调试
//	sleep(5);
	printf("result:%d\n",sum);
	return 0;
}

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#define NUM_THREAD 100
typedef long long LL;

void* thread_inc(void*);
void* thread_des(void*);
LL sum=0;
int main()
{
	pthread_t thread_id[NUM_THREAD];
	int i;

	printf("sizeof long long:%d\n",(int)sizeof(long long));
	for(i=0;i<NUM_THREAD;++i)		//创建100个线程
	{
		if(i%2)	
			pthread_create(&thread_id[i],NULL,thread_inc,NULL);
		else
			pthread_create(&thread_id[i],NULL,thread_inc,NULL);
	}
	for(i=0;i<NUM_THREAD;++i)
		pthread_join(thread_id[i],NULL);	//等待线程终止
	
	printf("result:%lld\n",sum);
	return 0;
}

void* thread_inc(void* arg)
{
	int i;
	for(i=0;i<50000000;++i)
		sum+=1;
	return NULL;
}
void* thread_des(void* arg)
{
	int i;
	for(i=0;i<50000000;++i)
		sum-=1;
	return NULL;
}