1SEM_DESTROY(3)             Linux Programmer's Manual            SEM_DESTROY(3)
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NAME

6       sem_destroy - destroy an unnamed semaphore
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SYNOPSIS

9       #include <semaphore.h>
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11       int sem_destroy(sem_t *sem);
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13       Link with -pthread.
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DESCRIPTION

16       sem_destroy()  destroys the unnamed semaphore at the address pointed to
17       by sem.
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19       Only a semaphore that has been initialized  by  sem_init(3)  should  be
20       destroyed using sem_destroy().
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22       Destroying  a  semaphore  that other processes or threads are currently
23       blocked on (in sem_wait(3)) produces undefined behavior.
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25       Using a semaphore that has been destroyed produces  undefined  results,
26       until the semaphore has been reinitialized using sem_init(3).
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RETURN VALUE

29       sem_destroy() returns 0 on success; on error, -1 is returned, and errno
30       is set to indicate the error.
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ERRORS

33       EINVAL sem is not a valid semaphore.
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ATTRIBUTES

36       For  an  explanation  of  the  terms  used   in   this   section,   see
37       attributes(7).
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39       ┌──────────────┬───────────────┬─────────┐
40       │Interface     │ Attribute     │ Value   │
41       ├──────────────┼───────────────┼─────────┤
42       │sem_destroy() │ Thread safety │ MT-Safe │
43       └──────────────┴───────────────┴─────────┘

CONFORMING TO

45       POSIX.1-2001, POSIX.1-2008.
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NOTES

48       An  unnamed semaphore should be destroyed with sem_destroy() before the
49       memory in which it is located is deallocated.  Failure to do  this  can
50       result in resource leaks on some implementations.
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SEE ALSO

53       sem_init(3), sem_post(3), sem_wait(3), sem_overview(7)
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COLOPHON

56       This  page  is  part of release 4.15 of the Linux man-pages project.  A
57       description of the project, information about reporting bugs,  and  the
58       latest     version     of     this    page,    can    be    found    at
59       https://www.kernel.org/doc/man-pages/.
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63Linux                             2017-09-15                    SEM_DESTROY(3)
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