头文件

#include<pthread.h>

函数声明

1 2	int pthread_create(pthread_t *tidp,const pthread_attr_t *attr, void *(*start_rtn)(void*),void *arg);

返回值

若线程创建成功，则返回0。若线程创建失败，则返回出错编号，并且*thread中的内容是未定义的。

返回成功时，由tidp指向的内存单元被设置为新创建线程的线程ID。attr参数用于指定各种不同的线程属性。新创建的线程从start_rtn函数的地址开始运行，该函数只有一个万能指针参数arg，如果需要向start_rtn函数传递的参数不止一个，那么需要把这些参数放到一个结构中，然后把这个结构的地址作为arg的参数传入。

参数

第一个参数为指向线程标识符的指针。

第二个参数用来设置线程属性。

第三个参数是线程运行函数的起始地址。

最后一个参数是运行函数的参数。

传参数

1.传多个参数：封装成结构体

typedef struct args{
    int id;
    char * name;
} ARGS;

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include "log.h"
#include "test.h"

int * thread(void * arg)
{
    pthread_t newthid;
    ARGS *args = (ARGS *)arg;
    newthid = pthread_self();
    LOGI(LOG_TAG,"this is a new thread, args->id = %d\n", args->id);
    LOGI(LOG_TAG,"this is a new thread, args->name = %s\n", args->name);
    return 0;
}

int main(void)
{
    pthread_t thid;

    LOGI(LOG_TAG,"main thread ,ID is %ld\n",pthread_self());
    ARGS *args;
    args->id = 10;
    args->name ="test";
    //int j=10;
    if(pthread_create(&thid, NULL, thread, args) != 0) {
        LOGI(LOG_TAG,"thread creation failed\n");
    }
}

I/jniTest: this is a new thread, args->id = 10
I/jniTest: this is a new thread, args->name = test

2.传单个参数

int * thread(void * arg)
{
    pthread_t newthid;

    newthid = pthread_self();
    int j = (int *)arg;
    LOGI(LOG_TAG,"this is a new thread, j = %d\n", j);
    return 0;
}

int main(void)
{
    pthread_t thid;

    LOGI(LOG_TAG,"main thread ,ID is %ld\n",pthread_self());

    int j=10;
    if(pthread_create(&thid, NULL, thread, j) != 0) {
        LOGI(LOG_TAG,"thread creation failed\n");
    }
}

int * thread(void * arg)
{
    pthread_t newthid;

    newthid = pthread_self();
    char* j = (char *)arg;
    LOGI(LOG_TAG,"this is a new thread, j = %s\n", j);
    return 0;
}

int main(void)
{
    pthread_t thid;

    LOGI(LOG_TAG,"main thread ,ID is %ld\n",pthread_self());

    char *j="10";
    if(pthread_create(&thid, NULL, thread, j) != 0) {
        LOGI(LOG_TAG,"thread creation failed\n");
    }
}

3.不传参数

pthread_create(&thid, NULL, thread, NULL)