04-24-2007
Question on creation of Thread pool
dear sir/madam
presently i am in a process of creating a multithread pool using
clone() system call in unix with c programming.
i am facing some problem ie., i am able create multithread pool and
able to keep all the threads in wait state,but when i call kill
(afunction revoke a thread after stopping it through raise
function) all the threads in the pool are revoking instead of only
one.In order to make only single thread to invoke and keep the
rest in wait condition i need to set a flag in clone system call
but i am unable to find that flag.I tried it with all flags that i
got in man and internet but i could not get it.so can anyone send
me the code for the same?
Thanks
Radha
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LEARN ABOUT OPENSOLARIS
set_tid_address
SET_TID_ADDRESS(2) Linux Programmer's Manual SET_TID_ADDRESS(2)
NAME
set_tid_address - set pointer to thread ID
SYNOPSIS
#include <linux/unistd.h>
long set_tid_address(int *tidptr);
Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
For each thread, the kernel maintains two attributes (addresses) called set_child_tid and clear_child_tid. These two attributes contain
the value NULL by default.
set_child_tid
If a thread is started using clone(2) with the CLONE_CHILD_SETTID flag, set_child_tid is set to the value passed in the ctid argu-
ment of that system call.
When set_child_tid is set, the very first thing the new thread does is to write its thread ID at this address.
clear_child_tid
If a thread is started using clone(2) with the CLONE_CHILD_CLEARTID flag, clear_child_tid is set to the value passed in the ctid
argument of that system call.
The system call set_tid_address() sets the clear_child_tid value for the calling thread to tidptr.
When a thread whose clear_child_tid is not NULL terminates, then, if the thread is sharing memory with other threads, then 0 is written at
the address specified in clear_child_tid and the kernel performs the following operation:
futex(clear_child_tid, FUTEX_WAKE, 1, NULL, NULL, 0);
The effect of this operation is to wake a single thread that is performing a futex wait on the memory location. Errors from the futex wake
operation are ignored.
RETURN VALUE
set_tid_address() always returns the caller's thread ID.
ERRORS
set_tid_address() always succeeds.
VERSIONS
This call is present since Linux 2.5.48. Details as given here are valid since Linux 2.5.49.
CONFORMING TO
This system call is Linux-specific.
NOTES
Glibc does not provide a wrapper for this system call; call it using syscall(2).
SEE ALSO
clone(2), futex(2), gettid(2)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SET_TID_ADDRESS(2)