/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
 * reserved.
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 * 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.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 5. Products derived from this software may not be called "Apache",
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#ifndef PROC_MUTEX_H
#define PROC_MUTEX_H

#include "apr.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_proc_mutex.h"
#include "apr_pools.h"
#include "apr_portable.h"
#include "apr_file_io.h"
#include "fileio.h"

/* System headers required by Locks library */
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#if APR_HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_SYS_IPC_H
#include <sys/ipc.h>
#endif
#ifdef HAVE_SYS_SEM_H
#include <sys/sem.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#if APR_HAVE_PTHREAD_H
#include <pthread.h>
#endif
#if APR_HAVE_SEMAPHORE_H
#include <semaphore.h>
#endif
/* End System Headers */

struct apr_proc_mutex_unix_lock_methods_t {
    unsigned int flags;
    apr_status_t (*create)(apr_proc_mutex_t *, const char *);
    apr_status_t (*acquire)(apr_proc_mutex_t *);
    apr_status_t (*tryacquire)(apr_proc_mutex_t *);
    apr_status_t (*release)(apr_proc_mutex_t *);
    apr_status_t (*destroy)(apr_proc_mutex_t *);
    apr_status_t (*child_init)(apr_proc_mutex_t **, apr_pool_t *, const char *);
    const char *name;
};
typedef struct apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_lock_methods_t;

/* bit values for flags field in apr_unix_lock_methods_t */
#define APR_PROCESS_LOCK_MECH_IS_GLOBAL          1

#if APR_HAS_POSIXSEM_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_posix_methods;
#endif
#if APR_HAS_SYSVSEM_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_sysv_methods;
#endif
#if APR_HAS_FCNTL_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_fcntl_methods;
#endif
#if APR_HAS_FLOCK_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_flock_methods;
#endif
#if APR_HAS_PROC_PTHREAD_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_proc_pthread_methods;
#endif
#if APR_HAS_RWLOCK_SERIALIZE
extern const apr_proc_mutex_unix_lock_methods_t apr_proc_mutex_unix_rwlock_methods;
#endif


#if !APR_HAVE_UNION_SEMUN && defined(APR_HAS_SYSVSEM_SERIALIZE)
union semun {
    int val;
    struct semid_ds *buf;
    unsigned short *array;
};
#endif

struct apr_proc_mutex_t {
    apr_pool_t *pool;
    const apr_proc_mutex_unix_lock_methods_t *meth;
    const apr_proc_mutex_unix_lock_methods_t *inter_meth;
    int curr_locked;
    char *fname;
#if APR_HAS_SYSVSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || APR_HAS_FLOCK_SERIALIZE
    apr_file_t *interproc;
#endif
#if APR_HAS_PROC_PTHREAD_SERIALIZE
    pthread_mutex_t *pthread_interproc;
#endif
#if APR_HAS_THREADS
    /* APR doesn't have threads, no sense in having a thread lock mechanism.
     */

    apr_os_thread_t owner;
    int owner_ref;
#endif
};

void apr_proc_mutex_unix_setup_lock(void);

#endif  /* PROC_MUTEX_H */

