Practical C Programming

How it works...

We will first define a mutex object by the name lock. Recall that a mutex is basically a lock associated with a shared resource. To read or modify the shared resource, a thread needs to first acquire the lock for that resource. We will define two variables of the pthread_t type , with the names tid1 and tid2, to store two thread identifiers.

We will invoke the pthread_mutex_init method that initializes the lock object with the default mutex attributes. When it's initialized, the lock object is in an unlocked state. We then invoke the pthread_create function twice to create two threads and assign their identifiers to the two variables tid1 and tid2, whose addresses are passed to the pthread_create function. The two threads ...