개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

sem_post(3)

SEM_POST(3)                Linux Programmer's Manual               SEM_POST(3)

NAME
       sem_post - unlock a semaphore

SYNOPSIS
       #include <semaphore.h>

       int sem_post(sem_t *sem);

       Link with -pthread.

DESCRIPTION
       sem_post()  increments  (unlocks)  the semaphore pointed to by sem.  If
       the semaphore's value consequently becomes greater than zero, then  an‐
       other  process or thread blocked in a sem_wait(3) call will be woken up
       and proceed to lock the semaphore.

RETURN VALUE
       sem_post() returns 0 on success; on error, the value of  the  semaphore
       is left unchanged, -1 is returned, and errno is set to indicate the er‐
       ror.

ERRORS
       EINVAL sem is not a valid semaphore.

       EOVERFLOW
              The maximum allowable value for a semaphore would be exceeded.

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{
       sem_post() T}   Thread safety  MT-Safe

CONFORMING TO
       POSIX.1-2001.

NOTES
       sem_post()  is async-signal-safe: it may be safely called within a sig‐
       nal handler.

EXAMPLE
       See sem_wait(3).

SEE ALSO
       sem_getvalue(3), sem_wait(3), sem_overview(7), signal-safety(7)

COLOPHON
       This page is part of release 5.02 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-03-13                       SEM_POST(3)