Is there any thread safe variable for Pthreads, i need to pass data from one thread to other

Question

Im new to implementation of pthreads

Im using pthreads for two separate actions but in some cases i will have to use data updated from first thread to be used by the other, so just a global variable, with mutex will work or is there any particular variable to be used?

Another thing is that how can i make a pthreads wait until a particular condition is achieved, now i use a "if" condition, but here, thread will be running continuously(Utilizing system recourses) and if condition is satisficed that piece of code works

I was looking for something like an interrupt is it possible?

similarly stopping a pthread, should i use pthreadexit?

Answer 1

Mutex + variable is sufficient. For second part of your question, please read about conditionals and how to use it with pthread (good start point can be https://linux.die.net/man/3/pthread_cond_signal )