close

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/syscall.h>
void child(void){
   pid_t tid = (pid_t) syscall (SYS_gettid);
    printf("i am child thread , pid = %d\n",tid);
}


int main( int argc, char **argv){
    int child_thread = 0;
    pthread_t id; 
    
    pid_t main_thread = (pid_t) syscall (SYS_gettid);
    
    printf("main thread pid %d\n",main_thread);
    
    child_thread = pthread_create( &id, NULL,(void *) child,NULL);
    
    if(child_thread != 0){ 
       printf ("Create pthread error!\n");
       exit (1);
    }   
    
    pthread_join( id, NULL);
    return 0;
}

 

remeber Makefile shall link library of thread


all:tpid


tar=tpid
obj=tpid.o
src=tpid.c


${tar}:${obj}
    cc -o $@ $^ -lpthread


${obj}:${src}
    cc -c $@ $^


clean:
    rm -rf *.o tpid

 

F.Y.I

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