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543 lines
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543 lines
25 KiB
HTML
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without even the implied warranty of MERCHANTABILITY or FITNESS
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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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<li><a href="#org3af33df">1. Memory data structure for the context</a></li>
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<li><a href="#org02aa41f">2. Passing info to allocation routines</a></li>
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<li><a href="#org356b6ae">3. Allocation/deallocation functions</a></li>
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</ul>
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</div>
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</div>
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<div id="outline-container-org3af33df" class="outline-2">
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<h2 id="org3af33df"><span class="section-number-2">1</span> Memory data structure for the context</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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Every time a new block of memory is allocated, the information
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relative to the allocation is stored in a new <code>qmckl_memory_info_struct</code>.
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A <code>qmckl_memory_info_struct</code> contains the pointer to the memory block,
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its size in bytes, and extra implementation-specific information such as
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alignment, pinning, if the memory should be allocated on CPU or GPU
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<i>etc</i>.
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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: #a020f0;">typedef</span> <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">qmckl_memory_info_struct</span> {
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<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>;
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} <span style="color: #228b22;">qmckl_memory_info_struct</span>;
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<span style="color: #a020f0;">static</span> <span style="color: #a020f0;">const</span> <span style="color: #228b22;">qmckl_memory_info_struct</span> <span style="color: #a0522d;">qmckl_memory_info_struct_zero</span> =
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{
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.size = (<span style="color: #228b22;">size_t</span>) 0,
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.pointer = <span style="color: #008b8b;">NULL</span>
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};
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</pre>
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</div>
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<p>
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The <code>memory</code> element of the context is a data structure which
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contains an array of <code>qmckl_memory_info_struct</code>, the size of the
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array, and the number of allocated blocks.
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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: #a020f0;">typedef</span> <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">qmckl_memory_struct</span> {
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<span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">n_allocated</span>;
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<span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">array_size</span>;
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<span style="color: #228b22;">qmckl_memory_info_struct</span>* <span style="color: #a0522d;">element</span>;
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} <span style="color: #228b22;">qmckl_memory_struct</span>;
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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 id="outline-container-org02aa41f" class="outline-2">
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<h2 id="org02aa41f"><span class="section-number-2">2</span> Passing info to allocation routines</h2>
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<div class="outline-text-2" id="text-2">
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<p>
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Passing information to the allocation routine should be done by
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passing an instance of a <code>qmckl_memory_info_struct</code>.
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</p>
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</div>
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</div>
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<div id="outline-container-org356b6ae" class="outline-2">
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<h2 id="org356b6ae"><span class="section-number-2">3</span> Allocation/deallocation functions</h2>
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<div class="outline-text-2" id="text-3">
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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;">qmckl_memory_info_struct</span> <span style="color: #a0522d;">info</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;">qmckl_memory_info_struct</span> <span style="color: #a0522d;">info</span>) {
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assert (qmckl_context_check(context) != QMCKL_NULL_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;
|
|
|
|
/* <span style="color: #b22222;">Allocate memory and zero it </span>*/
|
|
<span style="color: #228b22;">void</span> * <span style="color: #a0522d;">pointer</span> = malloc(info.size);
|
|
<span style="color: #a020f0;">if</span> (pointer == <span style="color: #008b8b;">NULL</span>) {
|
|
<span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
|
|
}
|
|
memset(pointer, 0, info.size);
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
/* <span style="color: #b22222;">If qmckl_memory_struct is full, reallocate a larger one </span>*/
|
|
<span style="color: #a020f0;">if</span> (ctx->memory.n_allocated == ctx->memory.array_size) {
|
|
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">old_size</span> = ctx->memory.array_size;
|
|
<span style="color: #228b22;">qmckl_memory_info_struct</span> * <span style="color: #a0522d;">new_array</span> = realloc(ctx->memory.element,
|
|
2L * old_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>) {
|
|
qmckl_unlock(context);
|
|
free(pointer);
|
|
<span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
|
|
}
|
|
|
|
memset( &(new_array[old_size]), 0, <span style="color: #228b22;">old_size</span> * <span style="color: #a020f0;">sizeof</span>(qmckl_memory_info_struct) );
|
|
ctx->memory.element = new_array;
|
|
ctx->memory.array_size = 2L * old_size;
|
|
}
|
|
|
|
/* <span style="color: #b22222;">Find first NULL entry </span>*/
|
|
<span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">pos</span> = (<span style="color: #228b22;">size_t</span>) 0;
|
|
<span style="color: #a020f0;">while</span> ( pos < ctx->memory.array_size && ctx->memory.element[pos].size > (<span style="color: #228b22;">size_t</span>) 0) {
|
|
pos += (<span style="color: #228b22;">size_t</span>) 1;
|
|
}
|
|
assert (ctx->memory.element[pos].size == (<span style="color: #228b22;">size_t</span>) 0);
|
|
|
|
/* <span style="color: #b22222;">Copy info at the new location </span>*/
|
|
ctx->memory.element[pos].size = info.size;
|
|
ctx->memory.element[pos].pointer = pointer;
|
|
ctx->memory.n_allocated += (<span style="color: #228b22;">size_t</span>) 1;
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
<span style="color: #a020f0;">return</span> pointer;
|
|
}
|
|
</pre>
|
|
</div>
|
|
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-c">/* <span style="color: #b22222;">Create a context </span>*/
|
|
<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span> = qmckl_context_create();
|
|
|
|
<span style="color: #228b22;">qmckl_memory_info_struct</span> <span style="color: #a0522d;">info</span> = qmckl_memory_info_struct_zero;
|
|
info.size = (<span style="color: #228b22;">size_t</span>) 3;
|
|
|
|
/* <span style="color: #b22222;">Allocate an array of ints </span>*/
|
|
<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, info);
|
|
|
|
/* <span style="color: #b22222;">Check that array of ints is OK </span>*/
|
|
<span style="color: #0000ff;">assert</span>(a != <span style="color: #008b8b;">NULL</span>);
|
|
<span style="color: #228b22;">a</span>[0] = 1; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">a</span>[0] == 1);
|
|
<span style="color: #228b22;">a</span>[1] = 2; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">a</span>[1] == 2);
|
|
<span style="color: #228b22;">a</span>[2] = 3; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">a</span>[2] == 3);
|
|
|
|
/* <span style="color: #b22222;">Allocate another array of ints </span>*/
|
|
<span style="color: #228b22;">int</span> *<span style="color: #a0522d;">b</span> = (<span style="color: #228b22;">int</span>*) <span style="color: #0000ff;">qmckl_malloc</span>(context, info);
|
|
|
|
/* <span style="color: #b22222;">Check that array of ints is OK </span>*/
|
|
<span style="color: #0000ff;">assert</span>(b != <span style="color: #008b8b;">NULL</span>);
|
|
<span style="color: #228b22;">b</span>[0] = 1; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">b</span>[0] == 1);
|
|
<span style="color: #228b22;">b</span>[1] = 2; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">b</span>[1] == 2);
|
|
<span style="color: #228b22;">b</span>[2] = 3; <span style="color: #0000ff;">assert</span>(<span style="color: #228b22;">b</span>[2] == 3);
|
|
</pre>
|
|
</div>
|
|
|
|
<p>
|
|
When freeing the memory with <code>qmckl_free</code>, the context is passed, in
|
|
case some important information has been stored related to memory
|
|
allocation and needs to be updated.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<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: #a020f0;">const</span> <span style="color: #a0522d;">ptr</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_free</span>(<span style="color: #228b22;">qmckl_context</span> <span style="color: #a0522d;">context</span>, <span style="color: #228b22;">void</span> * <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">ptr</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_free"</span>,
|
|
<span style="color: #008b8b;">NULL</span>);
|
|
}
|
|
|
|
<span style="color: #a020f0;">if</span> (ptr == <span style="color: #008b8b;">NULL</span>) {
|
|
<span style="color: #a020f0;">return</span> qmckl_failwith(context,
|
|
QMCKL_INVALID_ARG_2,
|
|
<span style="color: #8b2252;">"qmckl_free"</span>,
|
|
<span style="color: #8b2252;">"NULL pointer"</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;
|
|
|
|
qmckl_lock(context);
|
|
{
|
|
/* <span style="color: #b22222;">Find pointer in array of saved pointers </span>*/
|
|
<span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">pos</span> = (<span style="color: #228b22;">size_t</span>) 0;
|
|
<span style="color: #a020f0;">while</span> ( pos < ctx->memory.array_size && ctx->memory.element[pos].pointer != ptr) {
|
|
pos += (<span style="color: #228b22;">size_t</span>) 1;
|
|
}
|
|
|
|
<span style="color: #a020f0;">if</span> (pos >= ctx->memory.array_size) {
|
|
/* <span style="color: #b22222;">Not found </span>*/
|
|
qmckl_unlock(context);
|
|
<span style="color: #a020f0;">return</span> qmckl_failwith(context,
|
|
QMCKL_FAILURE,
|
|
<span style="color: #8b2252;">"qmckl_free"</span>,
|
|
<span style="color: #8b2252;">"Pointer not found in context"</span>);
|
|
}
|
|
|
|
free(ptr);
|
|
|
|
memset( &(ctx->memory.element[pos]), 0, <span style="color: #a020f0;">sizeof</span>(qmckl_memory_info_struct) );
|
|
ctx->memory.n_allocated -= (<span style="color: #228b22;">size_t</span>) 1;
|
|
}
|
|
qmckl_unlock(context);
|
|
|
|
<span style="color: #a020f0;">return</span> QMCKL_SUCCESS;
|
|
}
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="postamble" class="status">
|
|
<p class="author">Author: TREX CoE</p>
|
|
<p class="date">Created: 2022-02-11 Fri 14:38</p>
|
|
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
|
|
</div>
|
|
</body>
|
|
</html>
|