On 5/10/06, cheng long <kevinclcn@xxxxxxxxx> wrote:
I think the the process which calls pthread_create() is the
thread group leader, because it is first lightweight process in
the group. So, it's tgid == it's pid.
very true.:)
As your opinion, there should be a thread whose tgid and pid
are equal, i.e., getpid() == pthread_self(). Am I wrong?
Yes. But you cannot use pthread_self() in a unithreaded program. I am
not 100% sure about this because POSIX has not defined any error
condition for pthread_self() and has not told what will happen if it
is called in unithread (i mean without pthread_create()).
So, i don't know pthread is giving but u can say for a thread group leader
tgid == pid
getpid() == gettid()
Note: gettid is linux specfic.
#include <stdio.h>
#include <linux/unistd.h>
_syscall0(pid_t, gettid)
int main()
{
printf("pid %x, tid %x\n", getpid(), gettid());
return 0;
}
regards
Manish Regmi
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