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#############################################################################
##
## background.gd GAP 4 package IO
## Max Neunhoeffer
##
## Copyright (C) 2006-2011 by Max Neunhoeffer
## This file is free software, see license information at the end.
##
## This file contains declarations for background processes using fork.
##
# The types for background jobs by fork:
BindGlobal("BackgroundJobsFamily", NewFamily("BackgroundJobsFamily"));
DeclareCategory("IsBackgroundJob",
IsComponentObjectRep and IsAttributeStoringRep);
DeclareRepresentation("IsBackgroundJobByFork", IsBackgroundJob,
["pid", "childtoparent", "parenttochild", "result",
"terminated"]);
BindGlobal("BGJobByForkType",
NewType(BackgroundJobsFamily, IsBackgroundJobByFork));
# Some helpers for times:
DeclareGlobalFunction("DifferenceTimes");
DeclareGlobalFunction("CompareTimes");
# The constructor:
DeclareOperation("BackgroundJobByFork", [IsFunction, IsObject]);
DeclareOperation("BackgroundJobByFork", [IsFunction, IsObject, IsRecord]);
DeclareGlobalVariable("BackgroundJobByForkOptions");
DeclareGlobalFunction("BackgroundJobByForkChild");
# The operations/attributes/properties:
DeclareOperation("IsIdle", [IsBackgroundJob]);
DeclareOperation("HasTerminated", [IsBackgroundJob]);
DeclareOperation("WaitUntilIdle", [IsBackgroundJob]);
DeclareOperation("Kill", [IsBackgroundJob]);
DeclareOperation("Pickup", [IsBackgroundJob]);
DeclareOperation("Submit", [IsBackgroundJob, IsObject]);
# Parallel skeletons:
DeclareGlobalVariable("ParTakeFirstResultByForkOptions");
DeclareOperation("ParTakeFirstResultByFork", [IsList, IsList]);
DeclareOperation("ParTakeFirstResultByFork", [IsList, IsList, IsRecord]);
# Arguments are:
# list of job functions
# list of argument lists
# options record
DeclareGlobalVariable("ParDoByForkOptions");
DeclareOperation( "ParDoByFork", [IsList, IsList]);
DeclareOperation( "ParDoByFork", [IsList, IsList, IsRecord]);
# Arguments are:
# list of job functions
# list of argument lists
# options record
DeclareGlobalFunction("ParMapReduceWorker");
DeclareGlobalVariable("ParMapReduceByForkOptions");
DeclareOperation("ParMapReduceByFork",
[IsList, IsFunction, IsFunction, IsRecord]);
# Arguments are:
# list to work on
# map function
# reduce function (taking two arguments)
# options record
DeclareGlobalFunction("ParListWorker");
DeclareGlobalVariable("ParListByForkOptions");
DeclareOperation("ParListByFork",
[IsList, IsFunction, IsRecord]);
# Arguments are:
# list to work on
# map function
# options record
# The types for worker farms by fork:
BindGlobal("WorkerFarmsFamily", NewFamily("WorkerFarmsFamily"));
DeclareCategory("IsWorkerFarm",
IsComponentObjectRep and IsAttributeStoringRep);
DeclareRepresentation("IsWorkerFarmByFork", IsWorkerFarm,
["jobs", "inqueue", "outqueue", "whodoeswhat"]);
BindGlobal("WorkerFarmByForkType",
NewType(WorkerFarmsFamily, IsWorkerFarmByFork));
DeclareGlobalVariable("ParWorkerFarmByForkOptions");
DeclareOperation("ParWorkerFarmByFork", [IsFunction, IsRecord]);
# Arguments are:
# worker function
# options record
#
# This creates a new object of type "IsWorkerFarmByFork".
DeclareOperation("DoQueues", [IsWorkerFarmByFork, IsBool]);
DeclareOperation("Kill", [IsWorkerFarmByFork]);
DeclareOperation("Submit", [IsWorkerFarmByFork, IsList]);
DeclareOperation("IsIdle", [IsWorkerFarmByFork]);
DeclareOperation("Pickup", [IsWorkerFarmByFork]);
# Semantics:
# Starts some background jobs, maintains an "in" and an "out" queue.
# DoQueues feeds idle jobs from the input queue and gets results
# from them for the output queue.
# Kill and IsIdle work on all workers at the same time. Submit queues
# new jobs to the input queue and Pickup fetches all from the current
# output queue (pairs of the form [arglist,result]).
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
##
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