pthread_selfの概要

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

#include <sys/syscall.h>

pthread_t ntid;  

pid_t gettid(void)
{
  return syscall(__NR_gettid);
}


void printids(const char *s)  
{  
    pid_t pid;  
    pthread_t tid;  
    pid = getpid();  
    tid = pthread_self();  
    printf("%s pid is:%u ;tid is :%u (0x%x)
", s,(unsigned int)pid, (unsigned int)tid, (unsigned int)tid);
    printf("%s kid is:%u
",s,gettid() );
}   


void *thr_fn(void *arg)  
{  
    printids("new thread: ");  
    return((void *)0);  
}  



int main()
{
	int err;
    	err = pthread_create(&ntid, NULL, thr_fn, NULL);  
	printf("in main ntid is :%u
",ntid);
    	if (err != 0)  
        	printf("can't create thread: %d
", strerror(err));  
	
	printids("main thread:");
	sleep(3);
	return 0;
}