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mohq_locks.c
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mohq_locks.c
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/*
* Copyright (C) 2013-21 Robert Boisvert
*
* This file is part of the mohqueue module for Kamailio, a free SIP server.
*
* The mohqueue module 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
*
* The mohqueue module 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 "mohqueue_mod.h"
#include "mohq_locks.h"
/**********
* external functions
**********/
/**********
* Change Lock
*
* INPUT:
* Arg (1) = lock pointer
* Arg (2) = exclusive flag
* OUTPUT: 0 if failed
**********/
int mohq_lock_change (mohq_lock *plock, int bexcl)
{
/**********
* o lock memory
* o check set type
* o unlock memory
**********/
int nret = 0;
lock_get (plock->plock);
if (bexcl)
{
if (plock->lock_cnt == 1)
{
plock->lock_cnt = -1;
nret = 1;
}
}
else
{
if (plock->lock_cnt == -1)
{
plock->lock_cnt = 1;
nret = 1;
}
}
lock_release (plock->plock);
return nret;
}
/**********
* Destroy Lock Record
*
* INPUT:
* Arg (1) = lock pointer
* OUTPUT: none
**********/
void mohq_lock_destroy (mohq_lock *plock)
{
lock_destroy (plock->plock);
lock_dealloc (plock->plock);
return;
}
/**********
* Init Lock Record
*
* INPUT:
* Arg (1) = lock pointer
* OUTPUT: 0 if failed
**********/
int mohq_lock_init (mohq_lock *plock)
{
/**********
* alloc memory and initialize
**********/
char *pfncname = "mohq_lock_init: ";
plock->plock = lock_alloc ();
if (!plock->plock)
{
LM_ERR ("%sUnable to allocate lock memory!\n", pfncname);
return 0;
}
if (!lock_init (plock->plock))
{
LM_ERR ("%sUnable to init lock!\n", pfncname);
lock_dealloc (plock->plock);
return 0;
}
plock->lock_cnt = 0;
return -1;
}
/**********
* Release Lock
*
* INPUT:
* Arg (1) = lock pointer
* OUTPUT: none
**********/
void mohq_lock_release (mohq_lock *plock)
{
/**********
* o lock memory
* o reduce count
* o unlock memory
**********/
lock_get (plock->plock);
switch (plock->lock_cnt)
{
case -1:
plock->lock_cnt = 0;
break;
case 0:
LM_WARN ("mohq_lock_release: Lock was not set.\n");
break;
default:
plock->lock_cnt--;
break;
}
lock_release (plock->plock);
return;
}
/**********
* Set Lock
*
* INPUT:
* Arg (1) = lock pointer
* Arg (2) = exclusive flag
* Arg (3) = milliseconds to try; 0 = try once
* OUTPUT: 0 if failed
**********/
int mohq_lock_set (mohq_lock *plock, int bexcl, int nms_cnt)
{
int nret = 0;
do
{
/**********
* o lock memory
* o check set type
* o unlock memory
* o sleep if failed
**********/
lock_get (plock->plock);
if (bexcl)
{
if (!plock->lock_cnt)
{
plock->lock_cnt = -1;
nret = 1;
}
}
else
{
if (plock->lock_cnt != -1)
{
plock->lock_cnt++;
nret = 1;
}
}
lock_release (plock->plock);
if (!nret)
{ usleep (1); }
}
while (!nret && --nms_cnt >= 0);
return nret;
}