locks/beos/intraproc.c

/* ====================================================================
 * Copyright (c) 1999 The Apache Group.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
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 *    permission of the Apache Group.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 *
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 */

#include "apr_lock.h"
#include "apr_general.h"
#include "locks.h"
#include <kernel/OS.h>
#include <stdio.h>

ap_status_t lock_intra_cleanup(ap_lock_t *lock)
{
printf ("lock_intra_cleanup\n");
    if (lock->curr_locked == 1) {
    	if (atomic_add(&lock->ben_intraproc , -1) > 1){
    		release_sem (lock->sem_intraproc);
    	} else {
    		return errno;
    	}
    }
    return APR_SUCCESS;
}    

ap_status_t create_intra_lock(struct lock_t *new)
{
    int32 stat;
    new->sem_intraproc = (sem_id)ap_palloc(new->cntxt, sizeof(sem_id));
    new->ben_intraproc = (int32)ap_palloc(new->cntxt, sizeof(int32));
    
    new->ben_intraproc = 0;
    stat = create_sem(0, "ap_intraproc");
    if (stat < B_NO_ERROR){
    	lock_intra_cleanup(new);
        return stat;
    }
    new->sem_intraproc = stat;
    new->curr_locked == 0;
    ap_register_cleanup(new->cntxt, (void *)new, lock_intra_cleanup, NULL);
    return APR_SUCCESS;
}

ap_status_t lock_intra(ap_lock_t *lock)
{
    lock->curr_locked == 1;
	if (atomic_add (&lock->ben_intraproc, 1) >0){
		if (acquire_sem(lock->sem_intraproc) != B_NO_ERROR){
			atomic_add(&lock->ben_intraproc,-1);
	        return errno;
    	}
    }
    return APR_SUCCESS;
}

ap_status_t unlock_intra(ap_lock_t *lock)
{
	if (atomic_add(&lock->ben_intraproc, -1) > 1){
		release_sem(lock->sem_intraproc);
    }
    lock->curr_locked == 0;
    return APR_SUCCESS;
}

ap_status_t destroy_intra_lock(ap_lock_t *lock)
{
    ap_status_t stat;
    if ((stat = lock_intra_cleanup(lock)) == APR_SUCCESS) {
        ap_kill_cleanup(lock->cntxt, lock, lock_intra_cleanup);
        return APR_SUCCESS;
    }
    return stat;
}