about posix threads.

about posix threads.

[Lejanson C. Go]

i made a pthread program and i am quite puzzled why my program
spawns 4 threads.. when i view it in linux console.

i used 'ps -ax | grep myprog' command to get the processes for
my application and to my surprise it spawns 4 threads.. when i
only expected 3.. one for main, one for event, and one for recvdata.

spawnXXXXXX functions create new threads..

i really need ur help. can anyone tell me why this occur?

thanks a lot...


lejanson


=============/* snipp */==================
int main(void)
{

     ................
     ................
     ................

     if (spawnEventThrd())
     {
         fprintf(stderr, "spawning event thread error\n");
         exit(0);
     }


     if (spawnRecvDataThread())
     {
         fprintf(stderr, "spawning response thread error\n");
         exit(0);
     }

     ................
     ................
     ................
     return 0;
}

Re: about posix threads.

[nanakos]

>
> i made a pthread program and i am quite puzzled why my program
> spawns 4 threads.. when i view it in linux console.
>
> i used 'ps -ax | grep myprog' command to get the processes for
> my application and to my surprise it spawns 4 threads.. when i
> only expected 3.. one for main, one for event, and one for recvdata.
>
> spawnXXXXXX functions create new threads..
>
> i really need ur help. can anyone tell me why this occur?
>
> thanks a lot...
>
>
> lejanson
>


Can you provide us with all the source code????

> -
> To unsubscribe from this list: send the line "unsubscribe
> linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: about posix threads.

[Glynn Clements]

Lejanson C. Go wrote:

> i made a pthread program and i am quite puzzled why my program
> spawns 4 threads.. when i view it in linux console.
> 
> i used 'ps -ax | grep myprog' command to get the processes for
> my application and to my surprise it spawns 4 threads.. when i
> only expected 3.. one for main, one for event, and one for recvdata.
> 
> spawnXXXXXX functions create new threads..
> 
> i really need ur help. can anyone tell me why this occur?

If you use "ps axf", you will note that the additional thread is the
parent of all threads other than the main thread. This is just
something that the pthread library does; it doesn't indicate a bug in
your program.

I don't recall the precise reasons why the pthread library does this,
but it's related to limitations in the kernel's support for threads.

-- 
Glynn Clements <glynn.clements@virgin.net>

about Posix Threads

[Lejanson C. Go]

hello everyone. i am new here. i just would like to ask some
questions regarding posix threads and i hope someone could help
me.

i made a pthread program and i am quite puzzled why my program
spawns 4 threads.. when i view it in linux console.

i used 'ps -ax | grep myprog' command to get the processes for
my application and to my surprise it spawns 4 threads.. when i
only expected 3.. one for main, one for event, and one for recvdata.

spawnXXXXXX functions create new threads..

i really need ur help. can anyone tell me why this occur?

thanks a lot...


lejanson


=============/* snipp */==================
int main(void)
{

     ................
     ................
     ................

     if (spawnEventThrd())
     {
         fprintf(stderr, "spawning event thread error\n");
         exit(0);
     }


     if (spawnRecvDataThread())
     {
         fprintf(stderr, "spawning response thread error\n");
         exit(0);
     }

     ................
     ................
     ................
     return 0;
}