How do I count the number of running threads (pthreads)?

Question

If I search for counting the number of threads an application has, all the answers involve external programs like top. I want to count the threads within the ap

Answer 1

Use top -H. But chances are, if you can't read proc, top won't work anyway. If thats the case, there is no easy way and it would depend on your specific system.

Answer 2

You could write a tiny wrapper for pthread_create that counts created threads and link against that wrapper after you linked against the immutable library.

Answer 3

If you can't read /proc you are a bit in trouble, unless your program communicate with another program which reads /proc

If you don't want to read /proc because of portability concerns, you might use a library which abstracts that a bit, like libproc does