282 lines
10 KiB
Plaintext
282 lines
10 KiB
Plaintext
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// Copyright (C) 2006 Douglas Gregor <doug.gregor -at- gmail.com>
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/** @file environment.hpp
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*
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* This header provides the @c environment class, which provides
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* routines to initialize, finalization, and query the status of the
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* Boost MPI environment.
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*/
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#ifndef BOOST_MPI_ENVIRONMENT_HPP
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#define BOOST_MPI_ENVIRONMENT_HPP
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#include <boost/mpi/config.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/optional.hpp>
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#include <string>
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#include <iosfwd>
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namespace boost { namespace mpi {
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namespace threading {
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/** @brief specify the supported threading level.
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*
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* Based on MPI 2 standard/8.7.3
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*/
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enum level {
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/** Only one thread will execute.
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*/
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single = MPI_THREAD_SINGLE,
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/** Only main thread will do MPI calls.
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*
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* The process may be multi-threaded, but only the main
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* thread will make MPI calls (all MPI calls are ``funneled''
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* to the main thread).
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*/
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funneled = MPI_THREAD_FUNNELED,
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/** Only one thread at the time do MPI calls.
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*
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* The process may be multi-threaded, and multiple
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* threads may make MPI calls, but only one at a time:
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* MPI calls are not made concurrently from two distinct
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* threads (all MPI calls are ``serialized'').
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*/
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serialized = MPI_THREAD_SERIALIZED,
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/** Multiple thread may do MPI calls.
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*
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* Multiple threads may call MPI, with no restrictions.
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*/
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multiple = MPI_THREAD_MULTIPLE
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};
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/** Formated output for threading level. */
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std::ostream& operator<<(std::ostream& out, level l);
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/** Formated input for threading level. */
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std::istream& operator>>(std::istream& in, level& l);
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} // namespace threading
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/** @brief Initialize, finalize, and query the MPI environment.
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*
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* The @c environment class is used to initialize, finalize, and
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* query the MPI environment. It will typically be used in the @c
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* main() function of a program, which will create a single instance
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* of @c environment initialized with the arguments passed to the
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* program:
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*
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* @code
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* int main(int argc, char* argv[])
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* {
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* mpi::environment env(argc, argv);
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* }
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* @endcode
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*
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* The instance of @c environment will initialize MPI (by calling @c
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* MPI_Init) in its constructor and finalize MPI (by calling @c
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* MPI_Finalize for normal termination or @c MPI_Abort for an
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* uncaught exception) in its destructor.
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*
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* The use of @c environment is not mandatory. Users may choose to
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* invoke @c MPI_Init and @c MPI_Finalize manually. In this case, no
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* @c environment object is needed. If one is created, however, it
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* will do nothing on either construction or destruction.
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*/
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class BOOST_MPI_DECL environment : noncopyable {
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public:
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#ifdef BOOST_MPI_HAS_NOARG_INITIALIZATION
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/** Initialize the MPI environment.
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*
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* If the MPI environment has not already been initialized,
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* initializes MPI with a call to @c MPI_Init. Since this
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* constructor does not take command-line arguments (@c argc and @c
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* argv), it is only available when the underlying MPI
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* implementation supports calling @c MPI_Init with @c NULL
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* arguments, indicated by the macro @c
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* BOOST_MPI_HAS_NOARG_INITIALIZATION.
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*
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* @param abort_on_exception When true, this object will abort the
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* program if it is destructed due to an uncaught exception.
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*/
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explicit environment(bool abort_on_exception = true);
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/** Initialize the MPI environment.
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*
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* If the MPI environment has not already been initialized,
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* initializes MPI with a call to @c MPI_Init_thread. Since this
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* constructor does not take command-line arguments (@c argc and @c
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* argv), it is only available when the underlying MPI
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* implementation supports calling @c MPI_Init with @c NULL
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* arguments, indicated by the macro @c
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* BOOST_MPI_HAS_NOARG_INITIALIZATION.
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*
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* @param mt_level the required level of threading support.
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*
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* @param abort_on_exception When true, this object will abort the
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* program if it is destructed due to an uncaught exception.
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*/
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explicit environment(threading::level mt_level, bool abort_on_exception = true);
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#endif
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/** Initialize the MPI environment.
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*
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* If the MPI environment has not already been initialized,
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* initializes MPI with a call to @c MPI_Init.
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*
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* @param argc The number of arguments provided in @p argv, as
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* passed into the program's @c main function.
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*
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* @param argv The array of argument strings passed to the program
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* via @c main.
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*
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* @param abort_on_exception When true, this object will abort the
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* program if it is destructed due to an uncaught exception.
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*/
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environment(int& argc, char** &argv, bool abort_on_exception = true);
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/** Initialize the MPI environment.
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*
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* If the MPI environment has not already been initialized,
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* initializes MPI with a call to @c MPI_Init_thread.
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*
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* @param argc The number of arguments provided in @p argv, as
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* passed into the program's @c main function.
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*
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* @param argv The array of argument strings passed to the program
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* via @c main.
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*
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* @param mt_level the required level of threading support
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*
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* @param abort_on_exception When true, this object will abort the
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* program if it is destructed due to an uncaught exception.
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*/
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environment(int& argc, char** &argv, threading::level mt_level,
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bool abort_on_exception = true);
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/** Shuts down the MPI environment.
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*
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* If this @c environment object was used to initialize the MPI
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* environment, and the MPI environment has not already been shut
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* down (finalized), this destructor will shut down the MPI
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* environment. Under normal circumstances, this only involves
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* invoking @c MPI_Finalize. However, if destruction is the result
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* of an uncaught exception and the @c abort_on_exception parameter
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* of the constructor had the value @c true, this destructor will
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* invoke @c MPI_Abort with @c MPI_COMM_WORLD to abort the entire
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* MPI program with a result code of -1.
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*/
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~environment();
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/** Abort all MPI processes.
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*
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* Aborts all MPI processes and returns to the environment. The
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* precise behavior will be defined by the underlying MPI
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* implementation. This is equivalent to a call to @c MPI_Abort
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* with @c MPI_COMM_WORLD.
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*
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* @param errcode The error code to return to the environment.
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* @returns Will not return.
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*/
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static void abort(int errcode);
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/** Determine if the MPI environment has already been initialized.
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*
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* This routine is equivalent to a call to @c MPI_Initialized.
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*
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* @returns @c true if the MPI environment has been initialized.
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*/
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static bool initialized();
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/** Determine if the MPI environment has already been finalized.
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*
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* The routine is equivalent to a call to @c MPI_Finalized.
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*
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* @returns @c true if the MPI environment has been finalized.
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*/
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static bool finalized();
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/** Retrieves the maximum tag value.
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*
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* Returns the maximum value that may be used for the @c tag
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* parameter of send/receive operations. This value will be
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* somewhat smaller than the value of @c MPI_TAG_UB, because the
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* Boost.MPI implementation reserves some tags for collective
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* operations.
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*
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* @returns the maximum tag value.
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*/
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static int max_tag();
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/** The tag value used for collective operations.
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*
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* Returns the reserved tag value used by the Boost.MPI
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* implementation for collective operations. Although users are not
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* permitted to use this tag to send or receive messages, it may be
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* useful when monitoring communication patterns.
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*
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* @returns the tag value used for collective operations.
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*/
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static int collectives_tag();
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/** Retrieves the rank of the host process, if one exists.
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*
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* If there is a host process, this routine returns the rank of
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* that process. Otherwise, it returns an empty @c
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* optional<int>. MPI does not define the meaning of a "host"
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* process: consult the documentation for the MPI
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* implementation. This routine examines the @c MPI_HOST attribute
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* of @c MPI_COMM_WORLD.
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*
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* @returns The rank of the host process, if one exists.
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*/
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static optional<int> host_rank();
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/** Retrieves the rank of a process that can perform input/output.
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*
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* This routine returns the rank of a process that can perform
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* input/output via the standard C and C++ I/O facilities. If every
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* process can perform I/O using the standard facilities, this
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* routine will return @c any_source; if no process can perform
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* I/O, this routine will return no value (an empty @c
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* optional). This routine examines the @c MPI_IO attribute of @c
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* MPI_COMM_WORLD.
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*
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* @returns the rank of the process that can perform I/O, @c
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* any_source if every process can perform I/O, or no value if no
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* process can perform I/O.
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*/
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static optional<int> io_rank();
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/** Retrieve the name of this processor.
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*
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* This routine returns the name of this processor. The actual form
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* of the name is unspecified, but may be documented by the
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* underlying MPI implementation. This routine is implemented as a
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* call to @c MPI_Get_processor_name.
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*
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* @returns the name of this processor.
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*/
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static std::string processor_name();
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/** Query the current level of thread support.
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*/
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static threading::level thread_level();
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/** Are we in the main thread?
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*/
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static bool is_main_thread();
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private:
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/// Whether this environment object called MPI_Init
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bool i_initialized;
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/// Whether we should abort if the destructor is
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bool abort_on_exception;
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/// The number of reserved tags.
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static const int num_reserved_tags = 1;
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};
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} } // end namespace boost::mpi
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#endif // BOOST_MPI_ENVIRONMENT_HPP
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