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