mutex.c

Go to the documentation of this file.

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: mutex_8c-source.html,v 1.1 2008/06/08 10:20:56 sebdiaz Exp $";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"

/*
 * CDB___db_mutex_alloc --
 *      Allocate and initialize a mutex.
 *
 * PUBLIC: int CDB___db_mutex_alloc __P((DB_ENV *, REGINFO *, MUTEX **));
 */
int
CDB___db_mutex_alloc(dbenv, infop, storep)
        DB_ENV *dbenv;
        REGINFO *infop;
        MUTEX **storep;
{
        int ret;

        /*
         * If the architecture supports mutexes in heap memory, use that
         * memory.  If it doesn't, we have to allocate space in a region.
         */
#ifdef MUTEX_NO_MALLOC_LOCKS
        R_LOCK(dbenv, infop);
        ret = CDB___db_shalloc(infop->addr, sizeof(MUTEX), MUTEX_ALIGN, storep);
        R_UNLOCK(dbenv, infop);
#else
        COMPQUIET(dbenv, NULL);
        COMPQUIET(infop, NULL);
        ret = CDB___os_calloc(dbenv, 1, sizeof(MUTEX), storep);
#endif
        if (ret != 0)
                CDB___db_err(dbenv, "Unable to allocate memory for mutex");
        return (ret);
}

/*
 * CDB___db_mutex_free --
 *      Free a mutex.
 *
 * PUBLIC: void CDB___db_mutex_free __P((DB_ENV *, REGINFO *, MUTEX *));
 */
void
CDB___db_mutex_free(dbenv, infop, mutexp)
        DB_ENV *dbenv;
        REGINFO *infop;
        MUTEX *mutexp;
{
#ifdef MUTEX_NO_MALLOC_LOCKS
        R_LOCK(dbenv, infop);
        CDB___db_shalloc_free(infop->addr, mutexp);
        R_UNLOCK(dbenv, infop);
#else
        COMPQUIET(dbenv, NULL);
        COMPQUIET(infop, NULL);
        CDB___os_free(mutexp, sizeof(*mutexp));
#endif
}

---