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

/*

 *  (C) 2013 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#ifndef MCS_MUTEX_H_INCLUDED

#define MCS_MUTEX_H_INCLUDED

#include <mpi.h>

#define MCS_MUTEX_TAG 100

#ifdef ENABLE_DEBUG

#define debug_print(...) do { printf(__VA_ARGS__); } while (0)

#else

#define debug_print(...)

#endif

struct mcs_mutex_s {

    int tail_rank;

    MPI_Comm comm;

    MPI_Win window;

    int *base;

    MPI_Info win_info;

};

typedef struct mcs_mutex_s *MCS_Mutex;

#define MCS_MTX_ELEM_DISP 0

#define MCS_MTX_TAIL_DISP 1

int MCS_Mutex_create(int tail_rank, MPI_Comm comm, MCS_Mutex * hdl_out);

int MCS_Mutex_free(MCS_Mutex * hdl_ptr);

int MCS_Mutex_lock(MCS_Mutex hdl);

int MCS_Mutex_trylock(MCS_Mutex hdl, int *success);

int MCS_Mutex_unlock(MCS_Mutex hdl);

#endif /* MCS_MUTEX_H_INCLUDED */