代码示范：linux多线程

代码示例：linux多线程

#include <stdio.h>#include <pthread.h>#include <sys/syscall.h>int gettid(){return syscall(SYS_gettid);}void print_pid_tid(){printf("Current pid is %u and current tid(lwp_id) is %u\n", (unsigned int)getpid(), (unsigned int)gettid());}void * thread_func(){printf("Created thread: ");print_pid_tid();}int main(){pthread_t  thread; int err = pthread_create(&thread, NULL, thread_func, NULL); //第3个参数是一个函数，相当于java Runnable类里的run方法if(err != 0){perror("Cannot create thread");}pthread_join(thread, NULL); //跟java里的Thread.join()方法一码事printf("Main thread: ");print_pid_tid();}

编译时要使用-pthread参数

$gcc -pthread fullthread.c

运行结果
Created thread: Current pid is 29739 and current tid(lwp_id) is 29740
Main thread: Current pid is 29739 and current tid(lwp_id) is 29739

主线程和新线程的PID是相同的，这是因为POSIX的规定：同一个程序中的所有线程应该有相同的PID.
但是二者的轻量级进程ID(lwp)并不相同. 因为linux就是通过lwp来实现线程的。

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