sem_close — close a named semaphore
Synopsis
#include <semaphore.h> int sem_close(sem_t *sem);
Link with -pthread.
Description
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.
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 |
|---|---|---|
| sem_close() | Thread safety | MT-Safe |
Conforming to
POSIX.1-2001, POSIX.1-2008.
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)
Colophon
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