Name
sem_close - close a named semaphoreLibrary
POSIX threads library ( libpthread ", " -lpthread )Synopsis
#include <semaphore.h> int sem_close(sem_t * sem );
Description
sem_close() closes the named semaphore referred to bysem
, allowing any resources that the system has allocated to the calling process for this semaphore to be freed. Return Value
On success sem_close() returns 0; on error, -1 is returned, with errno set to indicate the error.Errors
EINVAL sem is not a valid semaphore.
Attributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Safe |
Standards
POSIX.1-2008.History
POSIX.1-2001.Notes
All open named semaphores are automatically closed on process termination, or upon execve(2).See Also
- sem_getvalue(3),
- sem_open(3),
- sem_post(3),
- sem_unlink(3),
- sem_wait(3),
- sem_overview(7)