Multhreading linux C question

[Mr.]

Hello,

this is a simple model for a simple program that will spawn a thread to run a given option in a menu (only option 1 and 2 run threads). The loop will need to wait for a thread to complete, so it uses the thread_join function

pthread_t newthread;

while ( 1 ) {

 scanf ("%d", &option );

 switch ( option ) {

    case 1:
              pthread_create ( newthread, NULL, function (1), NULL );
              break;
    case 2:
              pthread_create ( newthread, NULL, function (2), NULL );
              break;
     case 3:
             printf("message");
             break;
     case 4:
            exit (0);
            break;


 }

  thread_join ( newthread, NULL );
}

Well the thing is, the code will get there from option 3 also, so I wanted to know if this can cause problems (since option 3 doesn't create the thread).

Thanks for your time and help.

[Drowzee]

If you want to be safe, 'option' is still in scope, and you could just put an

if(option<3)

check to keep the thread_join from being called.

That'd be one way to take care of it, but it doesn't answer your question quite as you wanted...

[Mr.]

If you want to be safe, 'option' is still in scope, and you could just put an

if(option<3)

check to keep the thread_join from being called.

That'd be one way to take care of it, but it doesn't answer your question quite as you wanted...

Yeah, well, I think that putting pthread_join call after the pthread_Create call would work ok and would spare an if.

Just wanted to know if the other solution would clean everything.

Thanks for your comment , :).

[Mr.]

Probably gonna use the if anyway :o