Need the PID of a process in a thread


 
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# 1  
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?
# 2  
Old 05-11-2009
Two things - pids work on process, threadid on individual threads. Linux has threads running as lite processes. So this answer only works where every thread is really a separate process.
Code:
pid_t pid=getpid();

Write this value to a file - from inside the thread function.
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