include/thread_mpi.h

   1 /*
   2 This source code file is part of thread_mpi.
   3 Written by Sander Pronk, Erik Lindahl, and possibly others.
   4
   5 Copyright (c) 2009, Sander Pronk, Erik Lindahl.
   6 All rights reserved.
   7
   8 Redistribution and use in source and binary forms, with or without
   9 modification, are permitted provided that the following conditions are met:
  10 1) Redistributions of source code must retain the above copyright
  11    notice, this list of conditions and the following disclaimer.
  12 2) Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15 3) Neither the name of the copyright holders nor the
  16    names of its contributors may be used to endorse or promote products
  17    derived from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY US ''AS IS'' AND ANY
  20 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22 DISCLAIMED. IN NO EVENT SHALL WE BE LIABLE FOR ANY
  23 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 If you want to redistribute modifications, please consider that
  31 scientific software is very special. Version control is crucial -
  32 bugs must be traceable. We will be happy to consider code for
  33 inclusion in the official distribution, but derived work should not
  34 be called official thread_mpi. Details are found in the README & COPYING
  35 files.
  36 */
  37
  38 /*
  39    thread_mpi is a cross-platform threading library for applications in
  40    high-performance computing. It supports:
  41
  42    - Cross-platform thread primitives (thread creation, mutexes, spinlocks,
  43      barriers, thread-local storage, etc.).
  44    - Cross-platform atomic operations (compare-and-swap, add-return, etc) for
  45      safe lock-free synchronization.
  46    - An implementation of (currently, much of) MPI, either as a drop-in
  47      replacement, or for use in conjunction with a networked MPI
  48      implementation.
  49    - Shared-memory allocation and memory management (planned, as of now).
  50    - Basic lock-free data structures (planned, as of now).
  51
  52    Because it can be used as a drop-in replacement for MPI, existing codes
  53    using MPI can start using thread_mpi without major changes in the
  54    source code, assuming -- and this is a big assumption -- that the code
  55    is thread-safe.
  56
  57    Alternatively, networked MPI calls can be used in conjunction with
  58    thread_mpi calls (simply by using
  59     "#include <thread_mpi.h>"
  60    instead of
  61     "#include <tmpi.h>"
  62    and pre-fixing all thread_mpi MPI-like calls with tMPI instead of MPI.
  63
  64    The availability of both MPI calls and shared-memory constructs makes it
  65    possible to transition (relatively) seamlessly from an MPI-style code
  66    to code that's optimal on multicore CPUs.
  67
  68    Although MPI-style message passing isn't neccesarily optimal for
  69    performance on shared-memory systems, the MPI communicator concept and
  70    its emphasis on collective operations makes sense even when computing on
  71    one machine with multiple cores. The communicator forms the basis for
  72    the shared-memory allocation and lock-free data structure implementations
  73    in thread_mpi.
  74
  75    Although usable as a stand-alone library, thread_mpi is designed to
  76    be incorporated in the code tree, eliminating any external build
  77    requirements. The BSD-style license that this library is distributed
  78    with reflects this.
  79
  80    The atomic operations (such as compare-and-swap) are supported on:
  81    - gcc on x86, x86_64, PowerPC and Itanium.
  82    - Intel compilers on x86, x86_64 and Itanium.
  83    - xlc on PowerPC.
  84    - (partial) HP/UX compilers on Itanium.
  85 */
  86
  87 /** \file
  88  *
  89  * \brief Convenience header file for non-MPI compatibility.
  90  *
  91  * This file includes the tMPI header file thread_mpi/tmpi.h, as well
  92  * as thread_mpi/threads.h and thread_mpi/atomic.h header files. If you'd
  93  * like to use the components individually, include the relevant header
  94  * files directly.
  95  */
  96
  97 #include "thread_mpi/atomic.h"
  98 #include "thread_mpi/threads.h"
  99 #include "thread_mpi/barrier.h"
 100 #include "thread_mpi/event.h"
 101 #include "thread_mpi/lock.h"
 102 #include "thread_mpi/tmpi.h"
 103 #include "thread_mpi/collective.h"
 104 #include "thread_mpi/hwinfo.h"
 105
 106