/*
 * tiny-spool.h - common definitions for the tiny spooling system.
 */

#define SPOOL_DIR	  "tiny-spooldir"      /* top-level spool directory   */
#define SPOOL_DIR_IN	  SPOOL_DIR"/in"     /* temporary spool for 'lpc'.  */
#define SPOOL_DIR_COMMON  SPOOL_DIR"/common" /* common spool directory.     */
#define SPOOL_DIR_OUT	  SPOOL_DIR"/out"    /* temporary spool for 'lpd'.  */

#define SPOOL_COUNTER	  SPOOL_DIR"/counter" /* path to counter file.      */

#define SEM_ID    	667                  /* ID for the semaphore set.     */
#define SEM_MUTEX 	0		     /* semaphore in set for mutex.   */
#define SEM_COUNTER    1		     /* semaphore in set for counter. */

#define MAX_PATH 255	        	     /* max length of a path name.    */

/* external functions. */

/* get an ID of the seaphore set, possibly creating and initializing */
/* it, if it did not exist already.                                  */
extern int sem_set_get(char* caller, int create);

/* signal the 'counter' semaphore in the given set.                  */
extern void sem_signal_counter(int sem_set_id);
/* wait on the 'producer' semaphore in the given set.                */
extern void sem_wait_counter(int sem_set_id);

/* signal the 'mutex' semaphore in the given set.                    */
extern void sem_signal_mutex(int sem_set_id);
/* wait on the 'mutex' semaphore in the given set.                   */
extern void sem_wait_mutex(int sem_set_id);