POSIX Threads

I have two questions/doubts:-

1) Are there any system calls that will give the thread id of the currently running thread?

2) How to make a thread respond to a signal?

I had tried making a simple program where the main program first makes a thread which will print the character‘t’ in the standard output in an infinite loop, and the main program will print the character ‘m’ in the standard output. A signal handler for the signal SIGINT was installed in the main program which will print “You pressed ctrl+c” and will exit. Now, while executing the program, when the main program was executing (printing ‘m’ in the terminal), pressing ctrl+c was caught by the signal handler and printed the desired output. “You pressed ctrl+c” and exited.
But when the thread was executing (printing‘t’ in the terminal), pressing ctrl+c had no effect at all. I tried installing a separate signal handler in the thread by including the ‘signal()’ system call in the function which the thread was executing. Still there was no effect.

So how to make the thread handle signals?

Threads don't respond to signals - *processes* respond to signals. Threads execute within a process.

So how can I make the process respond to signals while a particular thread is executings?

You'd better tell what O/S, kernel and thread implementation you are using.

For example, LinuxThreads is far from being compliant to the POSIX model, you may want to look at the BUGS section of pthread_kill manual page on your system.

hi,
You can use pthread_self to get the current thread id, but its not a system call.

Regards,
Rajesh.