Suspend pthreads without using condition

Question

I want to suspend pthreads but apparently, there is no such function as pthread_suspend. I read somewhere about suspending pthreads using mutexes and conditions and used it

Answer 1

A condition is always associated with a mutex. Usually, a thread will sleep because it's waiting for a change of state to indicate that it has work to do; you need the mutex to guard access to that state, and the condition to signal the change.

Waking up a thread without telling it why you've woken it is a bit of an odd thing to do, so there's no special way to do it; the only way to do it is to use the normal mechanism, but with no shared state.

If for some reason you want to suspend and resume the thread from another thread, independently from giving it work to do, then you might be able to use pthread_kill to send it SIGSTOP and SIGCONT signals; I've never tried doing anything like that, so I've no idea whether or not it's supported.