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Full Discussion: Need the PID of a process in a thread
Top Forums Programming Need the PID of a process in a thread Post 302314899 by riccollado on Monday 11th of May 2009 04:00:59 AM
Old 05-11-2009
Need the PID of a process in a thread
How do I run a process from a C++ p_thread and obtain its PID? Right now I am doing in a p_thread:

Code:
system("ampl method.run");

and into the main function (after running the thread mentioned before):

Code:
sleep(5); //Just to be sure that the thread is executing the ampl command
system("ps -Ac| grep ampl | awk '{print $1}' > ~/AMPL_PID.txt");

This doesn't work. The main program hangs in the "system" function while the thread continues to execute. Once I manually kill the ampl process in the thread, the main program continues and writes the system("ps -Ac...") output to the desired location.

I need to be able to obtain the ampl command PID in order to later kill it (if necessary). Any ideas how to make this work or how to do this?
 

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LEARN ABOUT DEBIAN

gettid

GETTID(2)						     Linux Programmer's Manual							 GETTID(2)

NAME

       gettid - get thread identification

SYNOPSIS

       #include <sys/types.h>

       pid_t gettid(void);

       Note: There is no glibc wrapper for this system call; see NOTES.

DESCRIPTION

       gettid() returns the caller's thread ID (TID).  In a single-threaded process, the thread ID is equal to the process ID (PID, as returned by
       getpid(2)).  In a multithreaded process, all threads have the same PID, but each one has a unique TID.  For further details, see  the  dis-
       cussion of CLONE_THREAD in clone(2).

RETURN VALUE

       On success, returns the thread ID of the calling process.

ERRORS

       This call is always successful.

VERSIONS

       The gettid() system call first appeared on Linux in kernel 2.4.11.

CONFORMING TO

       gettid() is Linux-specific and should not be used in programs that are intended to be portable.

NOTES

       Glibc does not provide a wrapper for this system call; call it using syscall(2).

       The thread ID returned by this call is not the same thing as a POSIX thread ID (i.e., the opaque value returned by pthread_self(3)).

SEE ALSO

       clone(2), fork(2), getpid(2)

COLOPHON

       This  page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-07-13								 GETTID(2)
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