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691 lines
30 KiB
HTML
691 lines
30 KiB
HTML
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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*/
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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</script>
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</head>
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<body>
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<div id="org-div-home-and-up">
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<a accesskey="h" href=""> UP </a>
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<a accesskey="H" href="index.html"> HOME </a>
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</div><div id="content">
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<h1 class="title">Context</h1>
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<div id="table-of-contents">
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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<li><a href="#org17def99">1. Context handling</a>
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<ul>
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<li><a href="#orga857dce">1.1. Data structure</a></li>
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<li><a href="#orgfdad8cd">1.2. Creation</a></li>
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<li><a href="#org8d8a297">1.3. Locking</a></li>
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<li><a href="#orgda562ee">1.4. <span class="todo TODO">TODO</span> Copy</a></li>
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<li><a href="#org228e05c">1.5. Destroy</a></li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div id="outline-container-org17def99" class="outline-2">
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<h2 id="org17def99"><span class="section-number-2">1</span> Context handling</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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The context variable is a handle for the state of the library,
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and is stored in a data structure which can't be seen outside of
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the library. To simplify compatibility with other languages, the
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pointer to the internal data structure is converted into a 64-bit
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signed integer, defined in the <code>qmckl_context</code> type.
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A value of <code>QMCKL_NULL_CONTEXT</code> for the context is equivalent to a
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<code>NULL</code> pointer.
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</p>
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<div class="org-src-container">
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<pre class="src src-c" id="orgabbe1db"><span style="color: #a020f0;">typedef</span> <span style="color: #228b22;">int64_t</span> <span style="color: #228b22;">qmckl_context</span> ;
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<span style="color: #483d8b;">#define</span> <span style="color: #a0522d;">QMCKL_NULL_CONTEXT</span> (qmckl_context) 0
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</pre>
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</div>
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<p>
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An immutable context would have required to implement a garbage
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collector. To keep the library simple, we have chosen to implement
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the context as a mutable data structure, so it has to be handled
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with care.
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</p>
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<p>
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By convention, in this file <code>context</code> is a <code>qmckl_context</code> variable
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and <code>ctx</code> is a <code>qmckl_context_struct*</code> pointer.
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</p>
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</div>
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<div id="outline-container-orga857dce" class="outline-3">
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<h3 id="orga857dce"><span class="section-number-3">1.1</span> Data structure</h3>
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<div class="outline-text-3" id="text-1-1">
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<p>
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A tag is used internally to check if the memory domain pointed
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by a pointer is a valid context. This allows to check that even if
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the pointer associated with a context is non-null, we can still
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verify that it points to the expected data structure.
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</p>
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<div class="org-src-container">
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<pre class="src src-c"><span style="color: #483d8b;">#define</span> <span style="color: #a0522d;">VALID_TAG</span> 0xBEEFFACE
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<span style="color: #483d8b;">#define</span> <span style="color: #a0522d;">INVALID_TAG</span> 0xDEADBEEF
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</pre>
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</div>
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<p>
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The <code>qmckl_context_check</code> function checks if the domain pointed by
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the pointer is a valid context. It returns the input <code>qmckl_context</code>
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if the context is valid, <code>QMCKL_NULL_CONTEXT</code> otherwise.
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</p>
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<div class="org-src-container">
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<pre class="src src-c"><span style="color: #228b22;">qmckl_context</span> <span style="color: #0000ff;">qmckl_context_check</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) ;
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</pre>
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</div>
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<div class="org-src-container">
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<pre class="src src-c"><span style="color: #228b22;">qmckl_context</span> <span style="color: #0000ff;">qmckl_context_check</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
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<span style="color: #a020f0;">if</span> (context == QMCKL_NULL_CONTEXT)
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<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
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<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
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/* <span style="color: #b22222;">Try to access memory </span>*/
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<span style="color: #a020f0;">if</span> (ctx->tag != VALID_TAG) {
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<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
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}
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<span style="color: #a020f0;">return</span> context;
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}
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</pre>
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</div>
|
|
|
|
<p>
|
|
The context keeps a ``date'' that allows to check which data needs
|
|
to be recomputed. The date is incremented when the context is touched.
|
|
</p>
|
|
|
|
<p>
|
|
When a new element is added to the context, the functions
|
|
<a href="#orgfdad8cd">qmckl<sub>context</sub><sub>create</sub></a>, <a href="#org228e05c">qmckl<sub>context</sub><sub>destroy</sub></a> and <a href="#orgda562ee">qmckl<sub>context</sub><sub>copy</sub></a>
|
|
should be updated in order to make deep copies.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #0000ff;">qmckl_context_touch</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) ;
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #0000ff;">qmckl_context_touch</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
|
|
|
|
<span style="color: #a020f0;">if</span> (qmckl_context_check(context) == QMCKL_NULL_CONTEXT) {
|
|
<span style="color: #a020f0;">return</span> qmckl_failwith( context,
|
|
QMCKL_INVALID_CONTEXT,
|
|
<span style="color: #8b2252;">"qmckl_context_touch"</span>,
|
|
<span style="color: #008b8b;">NULL</span>);
|
|
}
|
|
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
|
|
ctx->date += 1UL;
|
|
ctx->point.date += 1UL;
|
|
<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-orgfdad8cd" class="outline-3">
|
|
<h3 id="orgfdad8cd"><span class="section-number-3">1.2</span> Creation</h3>
|
|
<div class="outline-text-3" id="text-1-2">
|
|
<p>
|
|
To create a new context, <code>qmckl_context_create()</code> should be used.
|
|
</p>
|
|
<ul class="org-ul">
|
|
<li>Upon success, it returns a pointer to a new context with the <code>qmckl_context</code> type</li>
|
|
<li>It returns <code>QMCKL_NULL_CONTEXT</code> upon failure to allocate the internal data structure</li>
|
|
<li>A new context always has all its members initialized with a NULL value</li>
|
|
</ul>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_context</span> <span style="color: #0000ff;">qmckl_context_create</span>() {
|
|
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> =
|
|
(<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) malloc (<span style="color: #a020f0;">sizeof</span>(qmckl_context_struct));
|
|
|
|
<span style="color: #a020f0;">if</span> (ctx == <span style="color: #008b8b;">NULL</span>) {
|
|
<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
|
|
}
|
|
|
|
/* <span style="color: #b22222;">Set all pointers and values to NULL </span>*/
|
|
{
|
|
memset(ctx, 0, <span style="color: #a020f0;">sizeof</span>(qmckl_context_struct));
|
|
}
|
|
|
|
/* <span style="color: #b22222;">Initialize lock </span>*/
|
|
{
|
|
<span style="color: #228b22;">pthread_mutexattr_t</span> <span style="color: #a0522d;">attr</span>;
|
|
<span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
|
|
|
|
rc = pthread_mutexattr_init(&attr);
|
|
assert (rc == 0);
|
|
|
|
(<span style="color: #228b22;">void</span>) pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
|
|
|
|
rc = pthread_mutex_init ( &(ctx->mutex), &attr);
|
|
assert (rc == 0);
|
|
|
|
(<span style="color: #228b22;">void</span>) pthread_mutexattr_destroy(&attr);
|
|
}
|
|
|
|
/* <span style="color: #b22222;">Initialize data </span>*/
|
|
{
|
|
ctx->tag = VALID_TAG;
|
|
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span> = (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span>) ctx;
|
|
assert ( qmckl_context_check(context) != QMCKL_NULL_CONTEXT );
|
|
|
|
<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">rc</span>;
|
|
|
|
ctx->numprec.precision = QMCKL_DEFAULT_PRECISION;
|
|
ctx->numprec.range = QMCKL_DEFAULT_RANGE;
|
|
|
|
rc = qmckl_init_point(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
|
|
rc = qmckl_init_electron(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
|
|
rc = qmckl_init_nucleus(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
|
|
rc = qmckl_init_ao_basis(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
|
|
rc = qmckl_init_mo_basis(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
|
|
rc = qmckl_init_determinant(context);
|
|
assert (rc == QMCKL_SUCCESS);
|
|
}
|
|
|
|
/* <span style="color: #b22222;">Allocate qmckl_memory_struct </span>*/
|
|
{
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">size</span> = 128L;
|
|
<span style="color: #228b22;">qmckl_memory_info_struct</span> * <span style="color: #a0522d;">new_array</span> = calloc(size, <span style="color: #a020f0;">sizeof</span>(qmckl_memory_info_struct));
|
|
<span style="color: #a020f0;">if</span> (new_array == <span style="color: #008b8b;">NULL</span>) {
|
|
free(ctx);
|
|
<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
|
|
}
|
|
memset( &(new_array[0]), 0, <span style="color: #228b22;">size</span> * <span style="color: #a020f0;">sizeof</span>(qmckl_memory_info_struct) );
|
|
|
|
ctx->memory.element = new_array;
|
|
ctx->memory.array_size = size;
|
|
ctx->memory.n_allocated = (<span style="color: #228b22;">size_t</span>) 0;
|
|
}
|
|
|
|
<span style="color: #a020f0;">return</span> (<span style="color: #228b22;">qmckl_context</span>) ctx;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="outline-container-org8d8a297" class="outline-3">
|
|
<h3 id="org8d8a297"><span class="section-number-3">1.3</span> Locking</h3>
|
|
<div class="outline-text-3" id="text-1-3">
|
|
<p>
|
|
For thread safety, the context may be locked/unlocked. The lock is
|
|
initialized with the <code>PTHREAD_MUTEX_RECURSIVE</code> attribute, and the
|
|
number of times the thread has locked it is saved in the
|
|
<code>lock_count</code> attribute.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">void</span> <span style="color: #0000ff;">qmckl_lock</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
|
|
<span style="color: #a020f0;">if</span> (context == QMCKL_NULL_CONTEXT)
|
|
<span style="color: #a020f0;">return</span> ;
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
errno = 0;
|
|
<span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = pthread_mutex_lock( &(ctx->mutex) );
|
|
<span style="color: #a020f0;">if</span> (rc != 0) {
|
|
fprintf(stderr, <span style="color: #8b2252;">"DEBUG qmckl_lock:%s\n"</span>, strerror(rc) );
|
|
fflush(stderr);
|
|
}
|
|
assert (rc == 0);
|
|
ctx->lock_count += 1;
|
|
/*
|
|
<span style="color: #b22222;"> printf(" lock : %d\n", ctx->lock_count);</span>
|
|
*/
|
|
}
|
|
|
|
<span style="color: #228b22;">void</span> <span style="color: #0000ff;">qmckl_unlock</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
<span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = pthread_mutex_unlock( &(ctx->mutex) );
|
|
<span style="color: #a020f0;">if</span> (rc != 0) {
|
|
fprintf(stderr, <span style="color: #8b2252;">"DEBUG qmckl_unlock:%s\n"</span>, strerror(rc) );
|
|
fflush(stderr);
|
|
}
|
|
assert (rc == 0);
|
|
ctx->lock_count -= 1;
|
|
/*
|
|
<span style="color: #b22222;"> printf("unlock : %d\n", ctx->lock_count);</span>
|
|
*/
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-orgda562ee" class="outline-3">
|
|
<h3 id="orgda562ee"><span class="section-number-3">1.4</span> <span class="todo TODO">TODO</span> Copy</h3>
|
|
<div class="outline-text-3" id="text-1-4">
|
|
<p>
|
|
<code>qmckl_context_copy</code> makes a deep copy of a context. It returns
|
|
<code>QMCKL_NULL_CONTEXT</code> upon failure.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_context</span> <span style="color: #0000ff;">qmckl_context_copy</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
|
|
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">checked_context</span> = qmckl_context_check(context);
|
|
|
|
<span style="color: #a020f0;">if</span> (checked_context == QMCKL_NULL_CONTEXT) {
|
|
<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
|
|
}
|
|
|
|
/*
|
|
<span style="color: #b22222;"> qmckl_lock(context);</span>
|
|
<span style="color: #b22222;"> {</span>
|
|
|
|
<span style="color: #b22222;"> const qmckl_context_struct* const old_ctx =</span>
|
|
<span style="color: #b22222;"> (qmckl_context_struct* const) checked_context;</span>
|
|
|
|
<span style="color: #b22222;"> qmckl_context_struct* const new_ctx =</span>
|
|
<span style="color: #b22222;"> (qmckl_context_struct* const) malloc (context, sizeof(qmckl_context_struct));</span>
|
|
|
|
<span style="color: #b22222;"> if (new_ctx == NULL) {</span>
|
|
<span style="color: #b22222;"> qmckl_unlock(context);</span>
|
|
<span style="color: #b22222;"> return QMCKL_NULL_CONTEXT;</span>
|
|
<span style="color: #b22222;"> }</span>
|
|
|
|
<span style="color: #b22222;"> * Copy the old context on the new one *</span>
|
|
<span style="color: #b22222;"> * TODO Deep copies should be done here *</span>
|
|
<span style="color: #b22222;"> memcpy(new_ctx, old_ctx, sizeof(qmckl_context_struct));</span>
|
|
|
|
<span style="color: #b22222;"> qmckl_unlock( (qmckl_context) new_ctx );</span>
|
|
|
|
<span style="color: #b22222;"> return (qmckl_context) new_ctx;</span>
|
|
<span style="color: #b22222;"> }</span>
|
|
<span style="color: #b22222;"> qmckl_unlock(context);</span>
|
|
*/
|
|
<span style="color: #a020f0;">return</span> QMCKL_NULL_CONTEXT;
|
|
}
|
|
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="outline-container-org228e05c" class="outline-3">
|
|
<h3 id="org228e05c"><span class="section-number-3">1.5</span> Destroy</h3>
|
|
<div class="outline-text-3" id="text-1-5">
|
|
<p>
|
|
The context is destroyed with <code>qmckl_context_destroy</code>, leaving the ancestors untouched.
|
|
It frees the context, and returns the previous context.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c"><span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #0000ff;">qmckl_context_destroy</span>(<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>) {
|
|
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">checked_context</span> = qmckl_context_check(context);
|
|
<span style="color: #a020f0;">if</span> (checked_context == QMCKL_NULL_CONTEXT) <span style="color: #a020f0;">return</span> QMCKL_INVALID_CONTEXT;
|
|
|
|
<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ctx</span> = (<span style="color: #228b22;">qmckl_context_struct</span>* <span style="color: #a020f0;">const</span>) context;
|
|
assert (ctx != <span style="color: #008b8b;">NULL</span>); /* <span style="color: #b22222;">Shouldn't be possible because the context is valid </span>*/
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
/* <span style="color: #b22222;">Memory: Remove all allocated data </span>*/
|
|
<span style="color: #a020f0;">for</span> (<span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">pos</span> = (<span style="color: #228b22;">size_t</span>) 0 ; pos < ctx->memory.array_size ; ++pos) {
|
|
<span style="color: #a020f0;">if</span> (ctx->memory.element[pos].pointer != <span style="color: #008b8b;">NULL</span>) {
|
|
free(ctx->memory.element[pos].pointer);
|
|
memset( &(ctx->memory.element[pos]), 0, <span style="color: #a020f0;">sizeof</span>(qmckl_memory_info_struct) );
|
|
ctx->memory.n_allocated -= 1;
|
|
}
|
|
}
|
|
assert (ctx->memory.n_allocated == (<span style="color: #228b22;">size_t</span>) 0);
|
|
free(ctx->memory.element);
|
|
ctx->memory.element = <span style="color: #008b8b;">NULL</span>;
|
|
ctx->memory.array_size = (<span style="color: #228b22;">size_t</span>) 0;
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
ctx->tag = INVALID_TAG;
|
|
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc_destroy</span> = pthread_mutex_destroy( &(ctx->mutex) );
|
|
<span style="color: #a020f0;">if</span> (rc_destroy != 0) {
|
|
/* <span style="color: #b22222;">DEBUG </span>*/
|
|
fprintf(stderr, <span style="color: #8b2252;">"qmckl_context_destroy: %s (count = %d)\n"</span>, strerror(rc_destroy), ctx->lock_count);
|
|
abort();
|
|
}
|
|
|
|
free(ctx);
|
|
|
|
<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="postamble" class="status">
|
|
<p class="author">Author: TREX CoE</p>
|
|
<p class="date">Created: 2022-02-18 Fri 00:57</p>
|
|
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
|
|
</div>
|
|
</body>
|
|
</html>
|