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/* A thread pool.                                          */

/* Copyright (c) 2007, 2009-2013. The SimGrid Team.
 * All rights reserved.                                                     */

/* This program is free software; you can redistribute it and/or modify it
 * under the terms of the license (GNU LGPL) which comes with this package. */

#ifndef _XBT_PARMAP_H
#define _XBT_PARMAP_H

#include "xbt/misc.h"           /* SG_BEGIN_DECL */
#include "xbt/function_types.h"
#include "xbt/dynar.h"

SG_BEGIN_DECL()

/** \addtogroup XBT_parmap
  * \ingroup XBT_misc  
  * \brief Parallel map.
  *
  * A function is applied to all elements of a dynar in parallel with n worker
  * threads.
  * The worker threads are persistent until the destruction of the parmap.
  *
  * If there are more than n elements in the dynar, the worker threads are
  * allowed to fetch themselves remaining work with xbt_parmap_next() and
  * execute it.
  *
  * \{
  */

/** \brief Parallel map data type (opaque type) */
typedef struct s_xbt_parmap *xbt_parmap_t;

/**
 * \brief Synchronization mode of the worker threads of a parmap.
 */
typedef enum {
  XBT_PARMAP_POSIX,          /**< use POSIX synchronization primitives */
  XBT_PARMAP_FUTEX,          /**< use Linux futex system call */
  XBT_PARMAP_BUSY_WAIT,      /**< busy waits (no system calls, maximum CPU usage) */
  XBT_PARMAP_DEFAULT         /**< futex if available, posix otherwise */
} e_xbt_parmap_mode_t;

XBT_PUBLIC(xbt_parmap_t) xbt_parmap_new(unsigned int num_workers,
    e_xbt_parmap_mode_t mode);
XBT_PUBLIC(void) xbt_parmap_destroy(xbt_parmap_t parmap);

XBT_PUBLIC(void) xbt_parmap_apply(xbt_parmap_t parmap,
                                  void_f_pvoid_t fun,
                                  xbt_dynar_t data);
XBT_PUBLIC(void*) xbt_parmap_next(xbt_parmap_t parmap);

#ifdef HAVE_MC
XBT_PUBLIC(xbt_parmap_t) xbt_parmap_mc_new(unsigned int num_workers,
    e_xbt_parmap_mode_t mode);

XBT_PUBLIC(int) xbt_parmap_mc_apply(xbt_parmap_t parmap, 
                         int_f_pvoid_pvoid_t fun, 
                         void *data,
                         unsigned int length,
                         void* ref_snapshot);
#endif
/** \} */

SG_END_DECL()

#endif