set_default.c

/* 
 shm-arena    shared memory arena
 Copyright (C) 2006-2008 Lance Arsenault (LGPL v3)


    This file is part of shm-arena.

    shm-arena is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 3 of the
    License, or (at your option) any later version.

    shm-arena 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this program.  If not, see
    <http://www.gnu.org/licenses/>.
*/

#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>

#include <pthread.h>
#include "spew.h"
#include "assert.h"
#include "debug_lock.h"
#include "shm_arena.h"
#include "arena.h"
#include "arena_lock.h"


int shm_arena_set_default(const shm_arena_t arena)
{
  int ret = 0;
 
  pthread_mutex_lock(&_shm_create_arena_mutex);

  if(_shm_default_arena) ret = 1;

  _shm_default_arena = arena;

  pthread_mutex_unlock(&_shm_create_arena_mutex);

  SPEW(_INFO,
       "%s(arena=%p) %s default arena",
       __func__, arena, (ret)?"replaced":"set");
  return ret;
}