projects / OpenSPARC-T2-SAM / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION008500000000000000000"> | |
| 56 | 6.5 <tt class="module">statcache</tt> -- | |
| 57 | An optimization of <tt class="function">os.stat()</tt></A> | |
| 58 | </H1> | |
| 59 | ||
| 60 | <P> | |
| 61 | <A NAME="module-statcache"></A> | |
| 62 | ||
| 63 | <P> | |
| 64 | <div class="versionnote"><b>Deprecated since release 2.2.</b> | |
| 65 | Use <tt class="function"><tt class="module"><a href="module-os.html">os</a></tt>.stat()</tt> directly instead | |
| 66 | of using the cache; the cache introduces a very high level of | |
| 67 | fragility in applications using it and complicates application code | |
| 68 | with the addition of cache management support.</div><p></p> | |
| 69 | ||
| 70 | <P> | |
| 71 | The <tt class="module">statcache</tt> module provides a simple optimization to | |
| 72 | <tt class="function">os.stat()</tt>: remembering the values of previous invocations. | |
| 73 | ||
| 74 | <P> | |
| 75 | The <tt class="module">statcache</tt> module defines the following functions: | |
| 76 | ||
| 77 | <P> | |
| 78 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 79 | <td><nobr><b><tt id='l2h-1796' xml:id='l2h-1796' class="function">stat</tt></b>(</nobr></td> | |
| 80 | <td><var>path</var>)</td></tr></table></dt> | |
| 81 | <dd> | |
| 82 | This is the main module entry-point. | |
| 83 | Identical for <tt class="function">os.stat()</tt>, except for remembering the result | |
| 84 | for future invocations of the function. | |
| 85 | </dl> | |
| 86 | ||
| 87 | <P> | |
| 88 | The rest of the functions are used to clear the cache, or parts of | |
| 89 | it. | |
| 90 | ||
| 91 | <P> | |
| 92 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 93 | <td><nobr><b><tt id='l2h-1797' xml:id='l2h-1797' class="function">reset</tt></b>(</nobr></td> | |
| 94 | <td><var></var>)</td></tr></table></dt> | |
| 95 | <dd> | |
| 96 | Clear the cache: forget all results of previous <tt class="function">stat()</tt> | |
| 97 | calls. | |
| 98 | </dl> | |
| 99 | ||
| 100 | <P> | |
| 101 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 102 | <td><nobr><b><tt id='l2h-1798' xml:id='l2h-1798' class="function">forget</tt></b>(</nobr></td> | |
| 103 | <td><var>path</var>)</td></tr></table></dt> | |
| 104 | <dd> | |
| 105 | Forget the result of <code>stat(<var>path</var>)</code>, if any. | |
| 106 | </dl> | |
| 107 | ||
| 108 | <P> | |
| 109 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 110 | <td><nobr><b><tt id='l2h-1799' xml:id='l2h-1799' class="function">forget_prefix</tt></b>(</nobr></td> | |
| 111 | <td><var>prefix</var>)</td></tr></table></dt> | |
| 112 | <dd> | |
| 113 | Forget all results of <code>stat(<var>path</var>)</code> for <var>path</var> starting | |
| 114 | with <var>prefix</var>. | |
| 115 | </dl> | |
| 116 | ||
| 117 | <P> | |
| 118 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 119 | <td><nobr><b><tt id='l2h-1800' xml:id='l2h-1800' class="function">forget_dir</tt></b>(</nobr></td> | |
| 120 | <td><var>prefix</var>)</td></tr></table></dt> | |
| 121 | <dd> | |
| 122 | Forget all results of <code>stat(<var>path</var>)</code> for <var>path</var> a file in | |
| 123 | the directory <var>prefix</var>, including <code>stat(<var>prefix</var>)</code>. | |
| 124 | </dl> | |
| 125 | ||
| 126 | <P> | |
| 127 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 128 | <td><nobr><b><tt id='l2h-1801' xml:id='l2h-1801' class="function">forget_except_prefix</tt></b>(</nobr></td> | |
| 129 | <td><var>prefix</var>)</td></tr></table></dt> | |
| 130 | <dd> | |
| 131 | Similar to <tt class="function">forget_prefix()</tt>, but for all <var>path</var> values | |
| 132 | <em>not</em> starting with <var>prefix</var>. | |
| 133 | </dl> | |
| 134 | ||
| 135 | <P> | |
| 136 | Example: | |
| 137 | ||
| 138 | <P> | |
| 139 | <div class="verbatim"><pre> | |
| 140 | >>> import os, statcache | |
| 141 | >>> statcache.stat('.') | |
| 142 | (16893, 2049, 772, 18, 1000, 1000, 2048, 929609777, 929609777, 929609777) | |
| 143 | >>> os.stat('.') | |
| 144 | (16893, 2049, 772, 18, 1000, 1000, 2048, 929609777, 929609777, 929609777) | |
| 145 | </pre></div> | |
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| 181 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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