semaphore.h

Overview

Related Modules:

IPC

Description:

Provides functions and structures related to semaphore operations.

For example, you can use the functions to create, open, close, and delete semaphores, and perform P and V operations on semaphores.

Since:

1.0

Version:

1.0

Summary

Data Structures

Data Structure Name Description
sem_t Defines semaphores.

Macros

Macro Name and Value Description
SEM_FAILED   ((sem_t *)0) Defines the semaphore failure flag.

Functions

Function Name Description
sem_close (sem_t sem) int Closes a specified semaphore.
sem_destroy (sem_t sem) int Destroys a specified anonymous semaphore that is no longer used.
sem_getvalue (sem_t __restrict sem, int restrict sval) int Obtains the count value of a specified semaphore.
sem_init (sem_t sem, int pshared, unsigned int value) int Creates and initializes an anonymous semaphore.
sem_post (sem_t sem) int Increments the semaphore count by 1.
sem_timedwait (sem_t *restrict sem, const struct timespec __restrict timeout) int Obtains the semaphore, with a timeout period specified.
sem_trywait (sem_t sem) int Attempts to obtain the semaphore.
sem_unlink (const char name) int Deletes a specified semaphore.
sem_wait (sem_t sem) int Obtains the semaphore.