74 lines
2.1 KiB
Smalltalk
74 lines
2.1 KiB
Smalltalk
"
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(C) 2011 by Holger Hans Peter Freyther
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All Rights Reserved
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"
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Object subclass: Dispatcher [
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| queue dispatch quit |
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<category: 'OsmoCore-Core'>
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<comment: 'I run tasks from the same context.'>
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Dispatcher class >> instance [
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<category: 'singleton'>
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^ Smalltalk at: #OsmoDispatcher ifAbsentPut: [Dispatcher new].
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]
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Dispatcher class >> new [
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<category: 'private'>
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^ super new
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initialize;
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addToBeFinalized;
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yourself
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]
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initialize [
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<category: 'private'>
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quit := false.
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queue := SharedQueue new.
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dispatch := [
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Processor activeProcess name: 'OsmoDispatcher'.
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[quit]
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whileFalse: [
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self dispatch]
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] forkAt: Processor highIOPriority.
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]
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dispatchBlock: aBlock [
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<category: 'insert'>
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queue nextPut: aBlock.
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]
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dispatch [
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| block sem |
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block := queue next.
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sem := Semaphore new.
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"Run the code in a new process as the debugger might terminate this
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and then the dispatcher would not dispatch anymore. Use a Semaphore
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to make sure we keep on processing items in order."
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[[
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block on: Error do: [:error |
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error logException: 'dispatch failed on "%1".' % {block} area: #core.
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]] ensure: [sem signal]] fork.
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sem wait.
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]
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]
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Eval [
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Dispatcher instance.
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]
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