sem_close - close a named semaphore
POSIX threads library (libpthread, -lpthread)
#include <semaphore.h>
int sem_close(sem_t *sem);
sem_close() closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for this semaphore to be freed.
On success sem_close() returns 0; on error, -1 is returned, with errno set to indicate the error.
- EINVAL
- sem is not a valid semaphore.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| sem_close () | Thread safety | MT-Safe |
All open named semaphores are automatically closed on process termination, or upon execve(2).