C语言中pthread_create函数实现向线程函数传递参数

#include "apue.h"
#include <pthread.h>
#include "apueerror.h"
#include <iostream>
#include <string>
using namespace std;
pthread_t ntid;
void printids(const char *s){
	pid_t		pid;
	pthread_t	tid;
	pid = getpid();
	tid = pthread_self();
	printf("%s pid %lu tid %lu (0x%lx)\n", s, (unsigned long)pid,
	  (unsigned long)tid, (unsigned long)tid);
}
void *thr_fn(void *arg){
    cout << "----enter sub thread--------" << endl;
	printids("new thread: ");
	cout << "Change to C++ code!!" << endl;
    cout << "----exit from sub thread----" << endl;
	return((void *)0);
}
int main(void){
	int		err;
    //第四个参数为NULL，说明没有向线程函数传参数。
	err = pthread_create(&ntid, NULL, thr_fn, NULL);
	if (err != 0)
		err_exit(err, "can't create thread");
	printids("main thread:");
	sleep(1);
	exit(0);
}

#include "apue.h"
#include <pthread.h>
#include "apueerror.h"
#include <iostream>
#include <string>
using namespace std;
pthread_t ntid;
void printids(const char *s){
	pid_t		pid;
	pthread_t	tid;
	pid = getpid();
	tid = pthread_self();
	printf("%s pid %lu tid %lu (0x%lx)\n", s, (unsigned long)pid,
	  (unsigned long)tid, (unsigned long)tid);
}
struct Param {
	int a;
	int b;
	int c;
};
void *thr_fn( void *arg ) {
    cout << "----enter sub thread--------" << endl;
	int tmp = *(int *)arg;
	cout << "tmp=" << tmp << endl;
	printids("new thread: ");
	cout << "Change to C++ code!!" << endl;
    cout << "----exit from sub thread----" << endl;
	return((void *)0);
}
int main(void){
	int		err;
	int num = 123;
    //向线程函数传入一个参数。
	err = pthread_create(&ntid, NULL, thr_fn, &num);
	if (err != 0)
		err_exit(err, "can't create thread");
	printids("main thread:");
	sleep(1);
	exit(0);
}

#include "apue.h"
#include <pthread.h>
#include "apueerror.h"
#include <iostream>
#include <string>
using namespace std;
pthread_t ntid;
void printids(const char *s){
	pid_t		pid;
	pthread_t	tid;
	pid = getpid();
	tid = pthread_self();
	printf("%s pid %lu tid %lu (0x%lx)\n", s, (unsigned long)pid,
	  (unsigned long)tid, (unsigned long)tid);
}
struct Param {
	int a;
	int b;
	int c;
};
void *thr_fn(void *arg) {
    cout << "----enter sub thread--------" << endl;
	Param tmp = *(Param *)arg;
	cout << "tmp.a=" << tmp.a << endl;
	cout << "tmp.b=" << tmp.b << endl;
	cout << "tmp.c=" << tmp.c << endl;
	printids("new thread: ");
	cout << "Change to C++ code!!" << endl;
    cout << "----exit from sub thread----" << endl;
	return((void *)0);
}
int main(void){
	int		err;
	int num = 123;
	Param param1;
	param1.a = 11;
	param1.b = 22;
	param1.c = 33;
    //通过结构体向线程函数传入多个参数
	err = pthread_create(&ntid, NULL, thr_fn, &param1);
	if (err != 0)
		err_exit(err, "can't create thread");
	printids("main thread:");
	sleep(1);
	exit(0);
}