Linux/C++ 获取线程ID

一、Linux 获取线程ID

使用syscall获取lwp，也就是top -H中看到的id，但也要注意syscall造成的的开销：

//实例1
#include <iostream>
#include <unistd.h>
#include <sys/syscall.h>
 
using namespace std;
 
int main()
{
     int tid = syscall(SYS_gettid);
     cout << tid <<endl;

     return 0;
}

//实例2
#include <stdio.h>
#include <sys/syscall.h>   //Linux system call for thread id
#include <assert.h>
#include <pthread.h>
 
void *subThread()
{
    int i;
    printf("child thread lwpid = %u\n", syscall(SYS_gettid));
    printf("child thread tid = %u\n", pthread_self());
    scanf("%d", i);//code dump
}

int main()
{
    pthread_t tid;
    
    int rc;
    printf("main thread lwpid = %u\n", syscall(SYS_gettid));
    printf("main thread tid = %u\n", pthread_self());
    
    rc = pthread_create(&ti