/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/* vim: set ft=c.mpich : */

/*

 *  (C) 2016 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#ifndef MPL_SHM_MMAP_H_INCLUDED

#define MPL_SHM_MMAP_H_INCLUDED

typedef intptr_t MPLI_shm_lhnd_t;

typedef char *MPLI_shm_ghnd_t;

/* The local handle, lhnd, is valid only for the current process,

 * The global handle, ghnd, is valid across multiple processes

 * The handle flag, flag, is used to set various attributes of the

 *  handle.

 */

typedef struct MPLI_shm_lghnd_t {

    MPLI_shm_lhnd_t lhnd;

    MPLI_shm_ghnd_t ghnd;

    int flag;

} MPLI_shm_lghnd_t;

typedef MPLI_shm_lghnd_t *MPL_shm_hnd_t;

#define MPL_SHM_FNAME_LEN      50

#define MPLI_SHM_GHND_SZ       MPL_SHM_FNAME_LEN

#define MPLI_SHM_LHND_INVALID  (-1)

#define MPLI_SHM_LHND_INIT_VAL (-1)

#define MPLI_SHM_SEG_ALREADY_EXISTS EEXIST

/* Returns MPL_SHM_SUCCESS on success, MPL_SHM_EINTERN on error */

int MPLI_shm_lhnd_close(MPL_shm_hnd_t hnd);

#endif /* MPL_SHM_MMAP_H_INCLUDED */