Question

I have program that runs fast enough. I want to see the number of threads created by the program.

ldd test

shows use of library pthread. but how to find out number of threads created by the program. I only have command line access to the PC on which the program is run.
The platform is linux.

Answer 1

Using LD_PRELOAD, you should be able to wrap pthread_create sufficiently enough to log somewhere each time it is entered. That method is flawed, however, because it could introduce (or expose) races in your program that would not otherwise occur, possibly resulting in more or fewer threads being created.

Is just keeping track of this within the program (i.e. if a debug build) not an option?