author | Shane McErlean <shane.mcerlean@accenture.com> |
Fri, 27 Aug 2010 15:33:49 +0100 | |
changeset 101 | 1e82a8be084a |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`sched` --- Event scheduler |
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================================ |
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.. module:: sched |
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:synopsis: General purpose event scheduler. |
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.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il> |
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.. index:: single: event scheduling |
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The :mod:`sched` module defines a class which implements a general purpose event |
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scheduler: |
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.. class:: scheduler(timefunc, delayfunc) |
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The :class:`scheduler` class defines a generic interface to scheduling events. |
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It needs two functions to actually deal with the "outside world" --- *timefunc* |
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should be callable without arguments, and return a number (the "time", in any |
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units whatsoever). The *delayfunc* function should be callable with one |
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argument, compatible with the output of *timefunc*, and should delay that many |
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time units. *delayfunc* will also be called with the argument ``0`` after each |
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event is run to allow other threads an opportunity to run in multi-threaded |
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applications. |
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Example:: |
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>>> import sched, time |
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>>> s = sched.scheduler(time.time, time.sleep) |
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>>> def print_time(): print "From print_time", time.time() |
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... |
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>>> def print_some_times(): |
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... print time.time() |
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... s.enter(5, 1, print_time, ()) |
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... s.enter(10, 1, print_time, ()) |
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... s.run() |
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... print time.time() |
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... |
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>>> print_some_times() |
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930343690.257 |
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From print_time 930343695.274 |
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From print_time 930343700.273 |
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930343700.276 |
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In multi-threaded environments, the :class:`scheduler` class has limitations |
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with respect to thread-safety, inability to insert a new task before |
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the one currently pending in a running scheduler, and holding up the main |
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thread until the event queue is empty. Instead, the preferred approach |
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is to use the :class:`threading.Timer` class instead. |
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Example:: |
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>>> import time |
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>>> from threading import Timer |
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>>> def print_time(): |
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... print "From print_time", time.time() |
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... |
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>>> def print_some_times(): |
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... print time.time() |
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... Timer(5, print_time, ()).start() |
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... Timer(10, print_time, ()).start() |
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... time.sleep(11) # sleep while time-delay events execute |
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... print time.time() |
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... |
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>>> print_some_times() |
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930343690.257 |
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From print_time 930343695.274 |
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From print_time 930343700.273 |
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930343701.301 |
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.. _scheduler-objects: |
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Scheduler Objects |
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----------------- |
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:class:`scheduler` instances have the following methods and attributes: |
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.. method:: scheduler.enterabs(time, priority, action, argument) |
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Schedule a new event. The *time* argument should be a numeric type compatible |
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with the return value of the *timefunc* function passed to the constructor. |
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Events scheduled for the same *time* will be executed in the order of their |
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*priority*. |
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Executing the event means executing ``action(*argument)``. *argument* must be a |
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sequence holding the parameters for *action*. |
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Return value is an event which may be used for later cancellation of the event |
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(see :meth:`cancel`). |
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.. method:: scheduler.enter(delay, priority, action, argument) |
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Schedule an event for *delay* more time units. Other then the relative time, the |
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other arguments, the effect and the return value are the same as those for |
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:meth:`enterabs`. |
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.. method:: scheduler.cancel(event) |
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Remove the event from the queue. If *event* is not an event currently in the |
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queue, this method will raise a :exc:`RuntimeError`. |
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.. method:: scheduler.empty() |
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Return true if the event queue is empty. |
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109 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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110 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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111 |
.. method:: scheduler.run() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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112 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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113 |
Run all scheduled events. This function will wait (using the :func:`delayfunc` |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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114 |
function passed to the constructor) for the next event, then execute it and so |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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115 |
on until there are no more scheduled events. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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116 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
Either *action* or *delayfunc* can raise an exception. In either case, the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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118 |
scheduler will maintain a consistent state and propagate the exception. If an |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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119 |
exception is raised by *action*, the event will not be attempted in future calls |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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120 |
to :meth:`run`. |
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121 |
|
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122 |
If a sequence of events takes longer to run than the time available before the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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123 |
next event, the scheduler will simply fall behind. No events will be dropped; |
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124 |
the calling code is responsible for canceling events which are no longer |
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125 |
pertinent. |
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126 |
|
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.. attribute:: scheduler.queue |
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128 |
|
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129 |
Read-only attribute returning a list of upcoming events in the order they |
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will be run. Each event is shown as a :term:`named tuple` with the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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following fields: time, priority, action, argument. |
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132 |
|
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.. versionadded:: 2.6 |