sem_getvalue man page on CentOS

sem_getvalue man page on CentOS

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

NAME
       sem_getvalue - get the value of a semaphore

SYNOPSIS
       #include <semaphore.h>

       int sem_getvalue(sem_t *sem, int *sval);

DESCRIPTION
       sem_getvalue() places the current value of the semaphore pointed to sem
       into the integer pointed to by sval.

       If one or more processes or threads are blocked	waiting	 to  lock  the
       semaphore  with sem_wait(3), POSIX.1-2001 permits two possibilities for
       the value returned in sval: either 0 is returned; or a negative	number
       whose  absolute	value  is  the	count  of  the number of processes and
       threads currently blocked in sem_wait(3).  Linux adopts the former  be‐
       haviour.

RETURN VALUE
       sem_getvalue() 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.

NOTES
       The value of the	 semaphore  may	 already  have	changed	 by  the  time
       sem_getvalue() returns.

CONFORMING TO
       POSIX.1-2001.

SEE ALSO
       sem_post(3), sem_wait(3), sem_overview(7)

Linux 2.6.16			  2006-03-25		       SEM_GETVALUE(3)

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