Semaphores: A Definition
This lesson covers the basics of semaphores and its two main routines.
We'll cover the following...
A semaphore is an object with an integer value that we can manipulate with two routines; in the POSIX standard, these routines are ...
#include <semaphore.h>sem_t s;sem_init(&s, 0, 1);
In the code, we declare a semaphore s and initialize it to the value 1 by passing 1 in as the third argument. The second argument to sem_init() will be set to 0 in all of the examples we’ll see; this indicates that the semaphore is shared between threads in the same process. See the man page for details on other usages of semaphores (namely, how they can be used to ...
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