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2bf7921c7e
This commit converts the license handling to adhere to the REUSE
specification. It specifically:
1. Adds used licnses to LICENSES/ directory
2. Add "isc" template for adding the copyright boilerplate
3. Changes all source files to include copyright and SPDX license
header, this includes all the C sources, documentation, zone files,
configuration files. There are notes in the doc/dev/copyrights file
on how to add correct headers to the new files.
4. Handle the rest that can't be modified via .reuse/dep5 file. The
binary (or otherwise unmodifiable) files could have license places
next to them in <foo>.license file, but this would lead to cluttered
repository and most of the files handled in the .reuse/dep5 file are
system test files.
(cherry picked from commit 58bd26b6cf)
79 lines
2.1 KiB
Text
79 lines
2.1 KiB
Text
<!--
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Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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SPDX-License-Identifier: MPL-2.0
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, you can obtain one at https://mozilla.org/MPL/2.0/.
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See the COPYRIGHT file distributed with this work for additional
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information regarding copyright ownership.
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-->
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Changes I made last week to the task code simplified the task shutdown
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and termination model. Here's how things now work:
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When a task is shutdown:
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Any "on shutdown" events for the task are posted
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The "shutting down" attribute of the task is set
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Any attempts to add shutdown events with isc_task_onshutdown()
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will fail, since the task is already shutting down
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Task shutdown can be initiated explicitly, via a call to isc_task_shutdown(),
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or implicitly, when the following conditions occur:
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The "shutting down" attribute of the task is not set
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The task has no references
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The task has an empty event queue
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Task termination occurs when:
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The "shutting down" attribute of the task is set
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The task has no references
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The task has an empty event queue
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Notes from the task/event discussion led by Bob Halley on 13 March 2000:
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A task is an event queue.
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(task) --V
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(event)-->(event)-->(event)
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(runnable queue)--V
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(task)-->(task)-->(task)
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Normally only one task manager in an application.
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Task becomes runnable if it has a non-empty event queue.
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One or more worker threads run tasks.
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Event routines should be relatively short.
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Only one runnable queue that all workers share.
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Events for a task are always posted serially. Multiple worker threads
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will not be working on multiple events for one task at the same time.
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isc_event_send, posting an event, can't fail. It just adds an event
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to the task queue.
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Event action (callback) rules:
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* no locks held on your behald when entering a callback.
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* not allowed to block, except when acquiring a lock.
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* not allowed to hold a lock when exiting the callback.
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TIMERS?
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OMAPI -- need taskmgr to omapi_lib_init
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-- one task per client connection
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