SEM_DESTROY(3)

SEM_DESTROY(3) | Library Functions Manual | SEM_DESTROY(3)

# NAME

sem_destroy — destroy an unnamed semaphore

# LIBRARY

POSIX Real-time Library (librt, -lrt)

# SYNOPSIS

#include <semaphore.h>

int
sem_destroy(sem_t *sem);

# DESCRIPTION

The sem_destroy() function destroys the unnamed semaphore pointed to by sem. After a successful call to sem_destroy(), sem is unusable until re-initialized by another call to sem_init().

# RETURN VALUES

The sem_destroy() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

# ERRORS

sem_destroy() will fail if:

[EBUSY]
  There are currently threads blocked on the semaphore that sem points to.
[EINVAL]
  sem points to an invalid semaphore.

# SEE ALSO

sem_init(3)

# STANDARDS

sem_destroy() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).

POSIX does not define the behavior of sem_destroy() if called while there are threads blocked on sem, but this implementation is guaranteed to return -1 and set errno to EBUSY if there are threads blocked on sem.

January 22, 2003 | NetBSD 7.1