Linux cli command sem_post

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command sem_post and provides detailed information about the command sem_post, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the sem_post.

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NAME 🖥️ sem_post 🖥️

unlock a semaphore

LIBRARY

POSIX threads library (libpthread, -lpthread)

SYNOPSIS

#include <semaphore.h>
int sem_post(sem_t *sem);

DESCRIPTION

sem_post() increments (unlocks) the semaphore pointed to by sem. If the semaphore’s value consequently becomes greater than zero, then another process or thread blocked in a sem_wait(3) call will be woken up and proceed to lock the semaphore.

RETURN VALUE

sem_post() returns 0 on success; on error, the value of the semaphore is left unchanged, -1 is returned, and errno is set to indicate the error.

ERRORS

EINVAL
sem is not a valid semaphore.

EOVERFLOW
The maximum allowable value for a semaphore would be exceeded.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue

sem_post()

Thread safetyMT-Safe

STANDARDS

POSIX.1-2008.

HISTORY

POSIX.1-2001.

NOTES

sem_post() is async-signal-safe: it may be safely called within a signal handler.

EXAMPLES

See sem_wait(3) and shm_open(3).

SEE ALSO

sem_getvalue(3), sem_wait(3), sem_overview(7), signal-safety(7)

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