On 5/8/06, cheng long <kevinclcn@xxxxxxxxx> wrote:
Hi, Arun
> I "guess" the 'pid' field of task_struct would be returned, as
> pthread_self() by definition returns the calling thread's ID which in the
> kernel should be the thread's pid.Somebody please CMIIW.
Yes, There is a syscall sys_gettid() which returns pid field of task struct.
When a thread is created the threads gets a unique pid and its
parent's (creator's) tgid. pid serves as a thread id and tgid serves
as a "pid of a process in POSIX language".
Since "printf("thread id: %u\n", pthread_id())" will generate a very
larger number than
"printf("process id: %u\n", getpid() )", so I don't think
pthread_self() will return the pid field of it's task_struct.
Why do you think so?
pid is allocated by pid types. ie. pid is allocated differently for
process (i mean those created with CLONE_THREAD) and threads. so they
are so different.
regards
Manish Regmi
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