2021-03-19 13:49:11 +01:00
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2021-03-19 23:15:06 +01:00
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<!-- 2021-03-19 Fri 22:15 -->
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2021-03-19 13:49:11 +01:00
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<title>Memory management</title>
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/**
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*
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* @source: org-info.js
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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 org-info.js.
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*
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* Copyright (C) 2012-2019 Free Software Foundation, Inc.
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*
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*
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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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*
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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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*
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* @licend The above is the entire license notice
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* for the JavaScript code in org-info.js.
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*
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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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*/
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org_html_manager.set("TOC_DEPTH", "4");
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/*]]>*///-->
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</script>
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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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*/
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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">Memory management</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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2021-03-19 23:15:06 +01:00
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<li><a href="#orge0b7c90"></a></li>
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2021-03-19 13:49:11 +01:00
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</ul>
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</div>
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</div>
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<p>
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We override the allocation functions to enable the possibility of
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optimized libraries to fine-tune the memory allocation.
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</p>
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2021-03-19 23:15:06 +01:00
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<div id="outline-container-orge0b7c90" class="outline-2">
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<h2 id="orge0b7c90"></h2>
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<div class="outline-text-2" id="text-orge0b7c90">
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2021-03-19 13:49:11 +01:00
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<p>
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Memory allocation inside the library should be done with
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<code>qmckl_malloc</code>. It lets the library choose how the memory will be
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allocated, and a pointer is returned to the user. The context is
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passed to let the library store data related to the allocation
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inside the context. In this particular implementation of the library,
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we store a list of allocated pointers so that all the memory can be
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properly freed when the library is de-initialized.
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If the allocation failed, the <code>NULL</code> pointer is returned.
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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;">void</span>* <span style="color: #0000ff;">qmckl_malloc</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>,
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<span style="color: #a020f0;">const</span> <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">size</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;">void</span>* <span style="color: #0000ff;">qmckl_malloc</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>, <span style="color: #a020f0;">const</span> <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">size</span>) {
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<span style="color: #228b22;">void</span> * <span style="color: #a0522d;">pointer</span> = malloc( (<span style="color: #228b22;">size_t</span>) size );
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<span style="color: #a020f0;">if</span> (qmckl_context_check(context) != QMCKL_NULL_CONTEXT) {
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<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">rc</span>;
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rc = qmckl_context_append_memory(context, pointer, size);
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assert (rc == QMCKL_SUCCESS);
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}
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<span style="color: #a020f0;">return</span> pointer;
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}
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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-f90"><span style="color: #a020f0;">interface</span>
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<span style="color: #228b22;">type (c_ptr) </span><span style="color: #a020f0;">function</span> <span style="color: #0000ff;">qmckl_malloc</span> <span style="color: #000000; background-color: #ffffff;">(context, size) bind(C)</span>
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<span style="color: #a020f0;">use</span>, <span style="color: #a020f0;">intrinsic</span> :: <span style="color: #0000ff;">iso_c_binding</span>
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<span style="color: #228b22;">integer</span> (<span style="color: #008b8b;">c_int64_t</span>), <span style="color: #a020f0;">intent</span>(in), <span style="color: #a020f0;">value</span> ::<span style="color: #a0522d;"> context</span>
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<span style="color: #228b22;">integer</span> (<span style="color: #008b8b;">c_int64_t</span>), <span style="color: #a020f0;">intent</span>(in), <span style="color: #a020f0;">value</span> ::<span style="color: #a0522d;"> size</span>
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<span style="color: #a020f0;">end function</span> <span style="color: #0000ff;">qmckl_malloc</span>
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<span style="color: #a020f0;">end interface</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: #a0522d;">context</span> = qmckl_context_create();
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<span style="color: #228b22;">int</span> *<span style="color: #a0522d;">a</span> = (<span style="color: #228b22;">int</span>*) <span style="color: #0000ff;">qmckl_malloc</span>(context, 3*<span style="color: #a020f0;">sizeof</span>(<span style="color: #228b22;">int</span>));
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<span style="color: #0000ff;">munit_assert</span>(a != <span style="color: #008b8b;">NULL</span>);
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<span style="color: #228b22;">a</span>[0] = 1; <span style="color: #0000ff;">munit_assert_int</span>(<span style="color: #228b22;">a</span>[0], ==, 1);
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<span style="color: #228b22;">a</span>[1] = 2; <span style="color: #0000ff;">munit_assert_int</span>(<span style="color: #228b22;">a</span>[1], ==, 2);
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<span style="color: #228b22;">a</span>[2] = 3; <span style="color: #0000ff;">munit_assert_int</span>(<span style="color: #228b22;">a</span>[2], ==, 3);
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</pre>
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</div>
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<p>
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When freeing the memory with <code>qmckl_free</code>, the context is passed, in
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case some important information has been stored related to memory
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allocation and needs to be updated.
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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_exit_code</span> <span style="color: #0000ff;">qmckl_free</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>,
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<span style="color: #228b22;">void</span> *<span style="color: #a0522d;">ptr</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-f90"><span style="color: #a020f0;">interface</span>
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<span style="color: #228b22;">integer</span> (<span style="color: #008b8b;">c_int32_t</span>) <span style="color: #a020f0;">function</span> <span style="color: #0000ff;">qmckl_free</span> (context, ptr) <span style="color: #a020f0;">bind</span>(C)
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<span style="color: #a020f0;">use</span>, <span style="color: #a020f0;">intrinsic</span> :: <span style="color: #0000ff;">iso_c_binding</span>
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<span style="color: #228b22;">integer</span> (<span style="color: #008b8b;">c_int64_t</span>), <span style="color: #a020f0;">intent</span>(in), <span style="color: #a020f0;">value</span> ::<span style="color: #a0522d;"> context</span>
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<span style="color: #228b22;">type (c_ptr)</span>, <span style="color: #a020f0;">intent</span>(in), <span style="color: #a020f0;">value</span> :: <span style="color: #a0522d;">ptr</span>
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<span style="color: #a020f0;">end function</span> <span style="color: #0000ff;">qmckl_free</span>
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<span style="color: #a020f0;">end interface</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_exit_code</span> <span style="color: #0000ff;">qmckl_free</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>, <span style="color: #228b22;">void</span> *<span style="color: #a0522d;">ptr</span>) {
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<span style="color: #a020f0;">if</span> (qmckl_context_check(context) != QMCKL_NULL_CONTEXT) {
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<span style="color: #a020f0;">if</span> (ptr == <span style="color: #008b8b;">NULL</span>) {
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<span style="color: #a020f0;">return</span> qmckl_failwith(context,
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QMCKL_INVALID_ARG_2,
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<span style="color: #8b2252;">"qmckl_free"</span>,
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<span style="color: #8b2252;">"NULL pointer"</span>);
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}
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<span style="color: #228b22;">qmckl_exit_code</span> <span style="color: #a0522d;">rc</span>;
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rc = qmckl_context_remove_memory(context, ptr);
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assert (rc == QMCKL_SUCCESS);
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}
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free(ptr);
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<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
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}
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</pre>
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</div>
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</div>
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</div>
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</div>
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<div id="postamble" class="status">
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<p class="author">Author: TREX CoE</p>
|
2021-03-19 23:15:06 +01:00
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<p class="date">Created: 2021-03-19 Fri 22:15</p>
|
2021-03-19 13:49:11 +01:00
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<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
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