locking.h
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 /* $Id$ */
 /*
  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License 
  * along with this program; if not, write to the Free Software 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
 /*
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  *   ser locking library
  *
  *  2002-12-16 created by andrei
  *
  *
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 Implements:
 
 	lock_t* lock_alloc();                    - allocates a lock in shared mem.
 	lock_t* lock_init(lock_t* lock);         - inits the lock
 	void    lock_destroy(lock_t* lock);      - removes the lock (e.g sysv rmid)
 	void    lock_dealloc(lock_t* lock);      - deallocates the lock's shared m.
 	void    lock_get(lock_t* lock);          - lock (mutex down)
 	void    lock_release(lock_t* lock);      - unlock (mutex up)
 */
 
 #ifndef _locking_h
 #define _locking_h
 
 
 #ifdef FAST_LOCK
 #include "fastlock.h"
 
 typedef fl_lock_t lock_t;
 
 #define lock_alloc() shm_malloc(sizeof(lock_t))
 #define lock_destroy(lock) /* do nothing */ 
 #define lock_dealloc(lock) shm_free(lock)
 
 inline static lock_t* lock_init(lock_t* lock)
 {
 	init_lock(*lock);
 	return lock;
 }
 
 #define lock_get(lock) get_lock(lock)
 #define lock_release(lock) release_lock(lock)
 
 
 
 #elif defined USE_PTHREAD_MUTEX
 #include <pthread.h>
 
 typedef pthread_mutex_t lock_t;
 
 #define lock_alloc() shm_malloc(sizeof(lock_t))
 #define lock_destroy(lock) /* do nothing */ 
 #define lock_dealloc(lock) shm_free(lock)
 
 inline static lock_t* lock_init(lock_t* lock)
 {
 	if (pthread_mutex_init(lock, 0)==0) return lock;
 	else return 0;
 }
 
 #define lock_get(lock) pthread_mutex_lock(lock)
 #define lock_release(lock) pthread_mutex_unlock(lock)
 
 
 
 #elif defined USE_POSIX_SEM
 #include <semaphore.h>
 
 typedef sem_t lock_t;
 
 #define lock_alloc() shm_malloc(sizeof(lock_t))
 #define lock_destroy(lock) /* do nothing */ 
 #define lock_dealloc(lock) shm_free(lock)
 
 inline static lock_t* lock_init(lock_t* lock)
 {
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 	if (sem_init(lock, 1, 1)<0) return 0;
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 	return lock;
 }
 
 #define lock_get(lock) sem_wait(lock)
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 #define lock_release(lock) sem_post(lock)
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 #elif defined USE_SYSV_SEM
 #include <sys/ipc.h>
 #include <sys/sem.h>
 
 #if ((defined(HAVE_UNION_SEMUN) || defined(__GNU_LIBRARY__) )&& !defined(_SEM_SEMUN_UNDEFINED)) 
 	
 	/* union semun is defined by including sem.h */
 #else
 	/* according to X/OPEN we have to define it ourselves */
 	union semun {
 		int val;                      /* value for SETVAL */
 		struct semid_ds *buf;         /* buffer for IPC_STAT, IPC_SET */
 		unsigned short int *array;    /* array for GETALL, SETALL */
 		struct seminfo *__buf;        /* buffer for IPC_INFO */
 	};
 #endif
 
 typedef int lock_t;
 
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 #define lock_alloc() shm_malloc(sizeof(lock_t))
 #define lock_dealloc(lock) shm_free(lock)
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 inline static lock_t* lock_init(lock_t* lock)
 {
 	union semun su;
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 	*lock=semget(IPC_PRIVATE, 1, 0700);
 	if (*lock==-1) return 0;
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 	su.val=1;
 	if (semctl(*lock, 0, SETVAL, su)==-1){
 		/* init error*/
 		return 0;
 	}
 	return lock;
 }
 
 inline static void lock_destroy(lock_t* lock)
 {
 	semctl(*lock, 0, IPC_RMID, (union semun)(int)0);
 }
 
 #define lock_dealloc(lock) shm_free(lock)
 
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 inline static void lock_get(lock_t* lock)
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 {
 	struct sembuf sop;
 
 	sop.sem_num=0;
 	sop.sem_op=-1; /* down */
 	sop.sem_flg=0; /*SEM_UNDO*/
 	semop(*lock, &sop, 1);
 }
 
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 inline static void lock_release(lock_t* lock)
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 {
 	struct sembuf sop;
 	
 	sop.sem_num=0;
 	sop.sem_op=1; /* up */
 	sop.sem_flg=0; /* SEM_UNDO*/
 	semop(*lock, &sop, 1);
 }
 
 #else
 #error "no locking method selected"
 #endif
 
 
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 /*shm_{malloc, free}*/
 #include "mem/mem.h"
 #ifdef SHM_MEM
 #include "mem/shm_mem.h"
 #else
 #error "locking requires shared memroy support"
 #endif
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 #endif