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/*
* BIRD Object Locks
*
* (c) 1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_LOCKS_H_
#define _BIRD_LOCKS_H_
#include "lib/resource.h"
#include "lib/event.h"
/*
* The object locks are used for controlling exclusive access
* to various physical resources like UDP ports on specific devices.
* When you want to access such resource, you ask for a object lock
* structure, fill in specification of the object and your function
* you want to have called when the object is available and invoke
* olock_acquire() afterwards. When the object becomes free, the lock
* manager calls your function. To free the object lock, just call rfree
* on its resource.
*/
struct object_lock {
resource r;
ip_addr addr; /* Identification of a object: IP address */
unsigned int type; /* ... object type (OBJLOCK_xxx) */
struct iface *iface; /* ... interface */
unsigned int port; /* ... port number */
void (*hook)(struct object_lock *); /* Called when the lock succeeds */
void *data; /* User data */
/* ... internal to lock manager, don't touch ... */
node n; /* Node in list of olocks */
int state; /* OLOCK_STATE_xxx */
list waiters; /* Locks waiting for the same resource */
};
struct object_lock *olock_new(pool *);
void olock_acquire(struct object_lock *);
void olock_init(void);
#define OBJLOCK_UDP 1 /* UDP port */
#define OBJLOCK_TCP 2 /* TCP port */
#define OLOCK_STATE_FREE 0
#define OLOCK_STATE_LOCKED 1
#define OLOCK_STATE_WAITING 2
#define OLOCK_STATE_EVENT 3 /* waiting for unlock processing */
#endif
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