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| 54 | <H2><A NAME="SECTION0081310000000000000000"></A><A NAME="mutex-objects"></A> | |
| 55 | <BR> | |
| 56 | 6.13.1 Mutex Objects | |
| 57 | </H2> | |
| 58 | ||
| 59 | <P> | |
| 60 | <tt class="class">mutex</tt> objects have following methods: | |
| 61 | ||
| 62 | <P> | |
| 63 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 64 | <td><nobr><b><tt id='l2h-1989' xml:id='l2h-1989' class="method">test</tt></b>(</nobr></td> | |
| 65 | <td><var></var>)</td></tr></table></dt> | |
| 66 | <dd> | |
| 67 | Check whether the mutex is locked. | |
| 68 | </dl> | |
| 69 | ||
| 70 | <P> | |
| 71 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 72 | <td><nobr><b><tt id='l2h-1990' xml:id='l2h-1990' class="method">testandset</tt></b>(</nobr></td> | |
| 73 | <td><var></var>)</td></tr></table></dt> | |
| 74 | <dd> | |
| 75 | ``Atomic'' test-and-set, grab the lock if it is not set, | |
| 76 | and return <code>True</code>, otherwise, return <code>False</code>. | |
| 77 | </dl> | |
| 78 | ||
| 79 | <P> | |
| 80 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 81 | <td><nobr><b><tt id='l2h-1991' xml:id='l2h-1991' class="method">lock</tt></b>(</nobr></td> | |
| 82 | <td><var>function, argument</var>)</td></tr></table></dt> | |
| 83 | <dd> | |
| 84 | Execute <code><var>function</var>(<var>argument</var>)</code>, unless the mutex is locked. | |
| 85 | In the case it is locked, place the function and argument on the queue. | |
| 86 | See <tt class="method">unlock</tt> for explanation of when | |
| 87 | <code><var>function</var>(<var>argument</var>)</code> is executed in that case. | |
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| 89 | ||
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| 92 | <td><nobr><b><tt id='l2h-1992' xml:id='l2h-1992' class="method">unlock</tt></b>(</nobr></td> | |
| 93 | <td><var></var>)</td></tr></table></dt> | |
| 94 | <dd> | |
| 95 | Unlock the mutex if queue is empty, otherwise execute the first element | |
| 96 | in the queue. | |
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