Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program 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.

**

** This program 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

#include "zbxmutexs.h"

​

#ifdef _WINDOWS

#   include "zbxsysinfo.h"

#   include "log.h"

#else

#ifdef HAVE_PTHREAD_PROCESS_SHARED

typedef struct

{

    pthread_mutex_t     mutexes[ZBX_MUTEX_COUNT];

    pthread_rwlock_t    rwlocks[ZBX_RWLOCK_COUNT];

}

zbx_shared_lock_t;

​

static zbx_shared_lock_t    *shared_lock;

static int          shm_id, locks_disabled;

#else

#   if !HAVE_SEMUN

        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 */

        };

​

#       undef HAVE_SEMUN

#       define HAVE_SEMUN 1

#   endif   /* HAVE_SEMUN */

​

#   include "cfg.h"

#   include "zbxthreads.h"

​

    static int      ZBX_SEM_LIST_ID = -1;

    static unsigned char    mutexes;

#endif

​

/******************************************************************************

 *                                                                            *

 * Purpose: if pthread mutexes and read-write locks can be shared between     *

 *          processes then create them, otherwise fallback to System V        *

 *          semaphore operations                                              *

 *                                                                            *

 * Parameters: error - [OUT] dynamically allocated memory with error message. *