mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-09 12:48:43 +00:00
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
|
|
* 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 OBJLOCK_IP 3 /* IP protocol */
|
|
|
|
#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
|