SEM_GETVALUE(3) | Linux Programmer's Manual | SEM_GETVALUE(3) |
NAME
sem_getvalue - get the value of a semaphoreSYNOPSIS
#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.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.
CONFORMING TO
POSIX.1-2001.NOTES
The value of the semaphore may already have changed by the time sem_getvalue() returns.SEE ALSO
sem_post(3), sem_wait(3), sem_overview(7)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2012-05-13 | Linux |