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NetBSD 6.1.5 - man page for sem_getvalue (netbsd section 3)

SEM_GETVALUE(3) 		   BSD Library Functions Manual 		  SEM_GETVALUE(3)

NAME
     sem_getvalue -- get the value of a semaphore

LIBRARY
     POSIX Real-time Library (librt, -lrt)

SYNOPSIS
     #include <semaphore.h>

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

DESCRIPTION
     The sem_getvalue() function sets the variable pointed to by sval to the current value of the
     semaphore pointed to by sem, as of the time that the call to sem_getvalue() is actually run.

RETURN VALUES
     The sem_getvalue() 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_getvalue() will fail if:

     [EINVAL]		sem points to an invalid semaphore.

SEE ALSO
     sem_post(3), sem_trywait(3), sem_wait(3)

STANDARDS
     sem_getvalue() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

     The value of the semaphore is never negative, even if there are threads blocked on the sema-
     phore.  POSIX is somewhat ambiguous in its wording with regard to what the value of the sem-
     aphore should be if there are blocked waiting threads, but this behavior is conformant,
     given the wording of the specification.

BSD					 January 22, 2003				      BSD


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