Hi Ramagudi
I try to answer with a limited knowledge of NPTL...
Hello,
Let's say main program creates a secondary thread, which blocks on
a file descriptor (e.g. when trying to read);
probably you should read "BUGS" section in "man pthread_cancel".
Now main program wants to terminate.
Does it have to cancel/terminate the secondary thread first ?
I think yes, at least that's the clean way to do it.
can it cancel it ? how ? will pthread_cancel work ?
I guess yes. You may use pthread_cancel() together with
pthread_setcanceltype(PTHREAD_CAN-CEL_ASYNCHRONOUS) to enforce
cancellation as soon as possible. If not, by default it will be deffered
into the next earliest cancellation point.
If it will not cancel the secondary thread, but just exit() instead,
will the other thread keep running in the system ?
Now this is something I am not sure. IIRC, when a parent process is
killed, all its descendants are also killed. However, when the child is
doing something when being killed, it is killed "rudely", so it might
leave a defect e.g while doing write(), you suddenly kill it, then you
might lost data since the data memory aren't completely transfered into
page caches.
regards,
Mulyadi
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