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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2005,2007 Oracle. All rights reserved.
*
* $Id: mut_failchk.c,v 12.5 2007/05/17 15:15:45 bostic Exp $
*/
#include "db_config.h"
#include "db_int.h"
#include "dbinc/mutex_int.h"
/*
* __mut_failchk --
* Check for mutexes held by dead processes.
*
* PUBLIC: int __mut_failchk __P((DB_ENV *));
*/
int
__mut_failchk(dbenv)
DB_ENV *dbenv;
{
DB_MUTEXMGR *mtxmgr;
DB_MUTEXREGION *mtxregion;
DB_MUTEX *mutexp;
db_mutex_t i;
int ret;
char buf[DB_THREADID_STRLEN];
mtxmgr = dbenv->mutex_handle;
mtxregion = mtxmgr->reginfo.primary;
ret = 0;
MUTEX_SYSTEM_LOCK(dbenv);
for (i = 1; i <= mtxregion->stat.st_mutex_cnt; ++i, ++mutexp) {
mutexp = MUTEXP_SET(i);
/*
* We're looking for per-process mutexes where the process
* has died.
*/
if (!F_ISSET(mutexp, DB_MUTEX_ALLOCATED) ||
!F_ISSET(mutexp, DB_MUTEX_PROCESS_ONLY))
continue;
/*
* The thread that allocated the mutex may have exited, but
* we cannot reclaim the mutex if the process is still alive.
*/
if (dbenv->is_alive(
dbenv, mutexp->pid, 0, DB_MUTEX_PROCESS_ONLY))
continue;
__db_msg(dbenv, "Freeing mutex for process: %s",
dbenv->thread_id_string(dbenv, mutexp->pid, 0, buf));
/* Unlock and free the mutex. */
if (F_ISSET(mutexp, DB_MUTEX_LOCKED))
MUTEX_UNLOCK(dbenv, i);
if ((ret = __mutex_free_int(dbenv, 0, &i)) != 0)
break;
}
MUTEX_SYSTEM_UNLOCK(dbenv);
return (ret);
}
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