NAME

scount − return the count associated with a semaphore

SYNOPSIS

int scount(sem)
int sem;

DESCRIPTION

Scount returns the current count associated with semaphore sem.  A count of negative p means that there are p processes waiting on the semaphore; a count of positive p means that at most p more calls to WAIT(2) can occur before a process will be blocked (assuming no intervening sends occur). 

SEE ALSO

screate(2), sdelete(2), signal(2), sreset(2), wait(2)

BUGS

In this version, there is no way to distinguish SYSERR from a legal semaphore count of −1. 

December 01, 1986  —  Xinu Programmer’s Manual