projects / OpenSPARC-T2-SAM / blame
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| 54 | <H2><A NAME="SECTION009570000000000000000"></A><A NAME="timer-objects"></A> | |
| 55 | <BR> | |
| 56 | 7.5.7 Timer Objects | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | This class represents an action that should be run only after a | |
| 61 | certain amount of time has passed -- a timer. <tt class="class">Timer</tt> is a | |
| 62 | subclass of <tt class="class">Thread</tt> and as such also functions as an example of | |
| 63 | creating custom threads. | |
| 64 | ||
| 65 | <P> | |
| 66 | Timers are started, as with threads, by calling their <tt class="method">start()</tt> | |
| 67 | method. The timer can be stopped (before its action has begun) by | |
| 68 | calling the <tt class="method">cancel()</tt> method. The interval the timer will | |
| 69 | wait before executing its action may not be exactly the same as the | |
| 70 | interval specified by the user. | |
| 71 | ||
| 72 | <P> | |
| 73 | For example: | |
| 74 | <div class="verbatim"><pre> | |
| 75 | def hello(): | |
| 76 | print "hello, world" | |
| 77 | ||
| 78 | t = Timer(30.0, hello) | |
| 79 | t.start() # after 30 seconds, "hello, world" will be printed | |
| 80 | </pre></div> | |
| 81 | ||
| 82 | <P> | |
| 83 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 84 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-2747' xml:id='l2h-2747' class="class">Timer</tt></b>(</nobr></td> | |
| 85 | <td><var>interval, function, args=[], kwargs={}</var>)</td></tr></table></dt> | |
| 86 | <dd> | |
| 87 | Create a timer that will run <var>function</var> with arguments <var>args</var> and | |
| 88 | keyword arguments <var>kwargs</var>, after <var>interval</var> seconds have passed. | |
| 89 | </dl> | |
| 90 | ||
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| 93 | <td><nobr><b><tt id='l2h-2748' xml:id='l2h-2748' class="method">cancel</tt></b>(</nobr></td> | |
| 94 | <td><var></var>)</td></tr></table></dt> | |
| 95 | <dd> | |
| 96 | Stop the timer, and cancel the execution of the timer's action. This | |
| 97 | will only work if the timer is still in its waiting stage. | |
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