source/libnstd/msgsizemax.c

0001 /**
0002  * @brief Max message size determination functions
0003  *
0004  * @file msgsizemax.c
0005  */
0006 /* -----------------------------------------------------------------------------
0007  * Enduro/X Middleware Platform for Distributed Transaction Processing
0008  * Copyright (C) 2009-2016, ATR Baltic, Ltd. All Rights Reserved.
0009  * Copyright (C) 2017-2023, Mavimax, Ltd. All Rights Reserved.
0010  * This software is released under one of the following licenses:
0011  * AGPL (with Java and Go exceptions) or Mavimax's license for commercial use.
0012  * See LICENSE file for full text.
0013  * -----------------------------------------------------------------------------
0014  * AGPL license:
0015  *
0016  * This program is free software; you can redistribute it and/or modify it under
0017  * the terms of the GNU Affero General Public License, version 3 as published
0018  * by the Free Software Foundation;
0019  *
0020  * This program is distributed in the hope that it will be useful, but WITHOUT ANY
0021  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
0022  * PARTICULAR PURPOSE. See the GNU Affero General Public License, version 3
0023  * for more details.
0024  *
0025  * You should have received a copy of the GNU Affero General Public License along
0026  * with this program; if not, write to the Free Software Foundation, Inc.,
0027  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
0028  *
0029  * -----------------------------------------------------------------------------
0030  * A commercial use license is available from Mavimax, Ltd
0031  * contact@mavimax.com
0032  * -----------------------------------------------------------------------------
0033  */
0034 #include <ndrx_config.h>
0035 #include <string.h>
0036 #include <stdio.h>
0037 #include <stdlib.h>
0038 #include <memory.h>
0039 #include <errno.h>
0040
0041 #include <ndrstandard.h>
0042 #include <ndebug.h>
0043 #include <nstdutil.h>
0044 #include <sys_unix.h>
0045 #include <userlog.h>
0046 #include <cconfig.h>
0047 #include <sys/resource.h>
0048 /*---------------------------Externs------------------------------------*/
0049 /*---------------------------Macros-------------------------------------*/
0050 /*---------------------------Enums--------------------------------------*/
0051 /*---------------------------Typedefs-----------------------------------*/
0052 /*---------------------------Globals------------------------------------*/
0053 /*---------------------------Statics------------------------------------*/
0054 exprivate int volatile M_maxmsgsize_loaded = EXFALSE; /**< Is config loaded? */
0055 exprivate long volatile M_maxmsgsize = EXFAIL; /**< Max message size */
0056 exprivate MUTEX_LOCKDECL(M_maxmsgsize_loaded_lock);
0057 /*---------------------------Prototypes---------------------------------*/
0058
0059 /**
0060  * Return configured max message size.
0061  * This will try to get value from environment, if not possible then NDRX_ATMI_MSG_MAX_SIZE
0062  * is used.
0063  * TODO: Have some sync here... no need to execute twice..
0064  * @return max message size
0065  */
0066 expublic long ndrx_msgsizemax (void)
0067 {
0068     char *esize;
0069
0070     if (NDRX_UNLIKELY(!M_maxmsgsize_loaded))
0071     {
0072         MUTEX_LOCK_V(M_maxmsgsize_loaded_lock);
0073
0074         if (!M_maxmsgsize_loaded)
0075         {
0076             /* this is thread safe function
0077              * it will not be a problem if this block is twice executed.
0078              */
0079             ndrx_cconfig_load();
0080
0081             esize = getenv(CONF_NDRX_MSGSIZEMAX);
0082
0083             if (NULL!=esize)
0084             {
0085                 M_maxmsgsize = atol(esize);
0086
0087                 if (M_maxmsgsize < NDRX_ATMI_MSG_MAX_SIZE)
0088                 {
0089                     M_maxmsgsize = NDRX_ATMI_MSG_MAX_SIZE;
0090                 }
0091             }
0092             else
0093             {
0094                 M_maxmsgsize = NDRX_ATMI_MSG_MAX_SIZE;
0095
0096             }
0097
0098             /* round the max msg size to modulus of 16, to be aligned. */
0099
0100             M_maxmsgsize = M_maxmsgsize + 16 - M_maxmsgsize % 16;
0101             /* avoid write re-ordering ! */
0102             __sync_synchronize();
0103             M_maxmsgsize_loaded=EXTRUE;
0104         }
0105         MUTEX_UNLOCK_V(M_maxmsgsize_loaded_lock);
0106     }
0107
0108     return M_maxmsgsize;
0109 }
0110
0111 /* vim: set ts=4 sw=4 et smartindent: */