/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#if !defined(MPIU_THREAD_SINGLE_H_INCLUDED)
#define MPIU_THREAD_SINGLE_H_INCLUDED

#define MPIU_THREAD_CHECK_BEGIN
#define MPIU_THREAD_CHECK_END

/* If single threaded, make this point at a pre-allocated segment.
   This structure is allocated in src/mpi/init/initthread.c */
extern MPIUI_Per_thread_t MPIUI_Thread;

#define MPIU_THREADPRIV_INITKEY
#define MPIU_THREADPRIV_INIT
#define MPIU_THREADPRIV_DECL
#define MPIU_THREADPRIV_GET
#define MPIU_THREADPRIV_FIELD(a_) (MPIUI_Thread.a_)

/* Helper definitions for the default macro definitions */
#define MPIU_THREAD_CS_ENTER(_name,_context)
#define MPIU_THREAD_CS_EXIT(_name,_context)
#define MPIU_THREAD_CS_YIELD(_name,_context)


/* define a type for the completion counter */
typedef int MPIU_cc_t;

#define MPIU_cc_get(cc_) (cc_)
#define MPIU_cc_set(cc_ptr_, val_) (*(cc_ptr_)) = (val_)
#define MPIU_cc_is_complete(cc_ptr_) (0 == *(cc_ptr_))

#define MPIU_cc_incr(cc_ptr_, was_incomplete_)  \
    do {                                        \
        *(was_incomplete_) = (*(cc_ptr_))++;    \
    } while (0)

#define MPIU_cc_decr(cc_ptr_, incomplete_)      \
    do {                                        \
        *(incomplete_) = --(*(cc_ptr_));        \
    } while (0)


/* "publishes" the obj with handle value (handle_) via the handle pointer
 * (hnd_lval_).  That is, it is a version of the following statement that fixes
 * memory consistency issues:
 *     (hnd_lval_) = (handle_);
 *
 * assumes that the following is always true: typeof(*hnd_lval_ptr_)==int
 */
/* This could potentially be generalized beyond MPI-handle objects, but we
 * should only take that step after seeing good evidence of its use.  A general
 * macro (that is portable to non-gcc compilers) will need type information to
 * make the appropriate volatile cast. */
/* Ideally _GLOBAL would use this too, but we don't want to count on OPA
 * availability in _GLOBAL mode.  Instead the GLOBAL critical section should be
 * used. */
#define MPIU_OBJ_PUBLISH_HANDLE(hnd_lval_, handle_)     \
    do {                                                \
        (hnd_lval_) = (handle_);                        \
    } while (0)

#endif /* !defined(MPIU_THREAD_SINGLE_H_INCLUDED) */