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Explain the need for a semaphore in Linux kernel.
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SEM_DESTROY(3) Linux Programmer's Manual SEM_DESTROY(3) NAME
sem_destroy - destroy an unnamed semaphore SYNOPSIS
#include <semaphore.h> int sem_destroy(sem_t *sem); Link with -lrt or -pthread. DESCRIPTION
sem_destroy() destroys the unnamed semaphore at the address pointed to by sem. Only a semaphore that has been initialized by sem_init(3) should be destroyed using sem_destroy(). Destroying a semaphore that other processes or threads are currently blocked on (in sem_wait(3)) produces undefined behavior. Using a semaphore that has been destroyed produces undefined results, until the semaphore has been reinitialized using sem_init(3). RETURN VALUE
sem_destroy() returns 0 on success; on error, -1 is returned, and errno is set to indicate the error. ERRORS
EINVAL sem is not a valid semaphore. CONFORMING TO
POSIX.1-2001. NOTES
An unnamed semaphore should be destroyed with sem_destroy() before the memory in which it is located is deallocated. Failure to do this can result in resource leaks on some implementations. SEE ALSO
sem_init(3), sem_post(3), sem_wait(3), sem_overview(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2006-03-25 SEM_DESTROY(3)
