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<title>11. MVFF (Manual Variable First Fit) &mdash; Memory Pool System 1.111.0 documentation</title>
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<div class="section" id="mvff-manual-variable-first-fit">
<span id="pool-mvff"></span><span id="index-0"></span><h1>11. MVFF (Manual Variable First Fit)<a class="headerlink" href="#mvff-manual-variable-first-fit" title="Permalink to this headline"></a></h1>
<p><strong>MVFF</strong> <a class="reference internal" href="../glossary/m.html#term-manual-memory-management"><em class="xref std std-term">manually manages</em></a>
variable-sized, unformatted objects. It uses the <a class="reference internal" href="../glossary/f.html#term-first-fit"><em class="xref std std-term">first fit</em></a>
<a class="reference internal" href="../glossary/a.html#term-allocation-policy"><em class="xref std std-term">allocation policy</em></a> for blocks allocated via
<a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a>.</p>
<p><a class="reference internal" href="../mmref/bib.html#johnstone97"><em>Johnstone (1997)</em></a> found that in his test cases:</p>
<blockquote>
<div>No version of <a class="reference internal" href="../glossary/b.html#term-best-fit"><em class="xref std std-term">best fit</em></a> had more than 5% actual
<a class="reference internal" href="../glossary/e.html#term-external-fragmentation"><em class="xref std std-term">fragmentation</em></a>. This is also true
for all versions of first fit that used an <a class="reference internal" href="../glossary/a.html#term-address-ordered-first-fit"><em class="xref std std-term">address-ordered
free list</em></a>, and the two versions of
first fit that used a <a class="reference internal" href="../glossary/f.html#term-fifo-ordered-first-fit"><em class="xref std std-term">FIFO free list</em></a>. This strongly suggests that the basic best-fit algorithm
and the first-fit algorithm with an address-ordered free list are
very robust algorithms.</div></blockquote>
<p>The MVFF pool class also supports buffered allocation (that is,
allocation via <a class="reference internal" href="../glossary/a.html#term-allocation-point"><em class="xref std std-term">allocation points</em></a>), and in this case, the
allocation policy is different: the buffers are filled according to
the <a class="reference internal" href="../glossary/w.html#term-worst-fit"><em class="xref std std-term">worst fit</em></a> policy, and allocation always proceeds upwards
from the base.</p>
<p>Buffered and unbuffered allocation can be used at the same time, but
the first allocation point must be created before any call to
<a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a>.</p>
<p>It is usually not advisable to use buffered and unbuffered allocation
on the same pool, because the worst-fit policy of buffer filling will
grab all the large blocks, leading to severe fragmentation. If you
need both forms of allocation, use two separate pools.</p>
<p>Note that buffered allocation can&#8217;t allocate across segment boundaries
(see <a class="reference internal" href="../topic/allocation.html#topic-allocation-point-implementation"><em>Allocation point implementation</em></a> for the technical
reason). This can cause added external fragmentation if objects are
allocated that are a significant fraction of the segment size.</p>
<div class="admonition-note admonition">
<p class="first admonition-title">Note</p>
<p class="last">If you need to allocate large objects in an MVFF pool,
<a class="reference internal" href="../contact.html#contact"><em>contact us</em></a>.</p>
</div>
<div class="section" id="mvff-properties">
<span id="index-1"></span><h2>11.1. MVFF properties<a class="headerlink" href="#mvff-properties" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Supports allocation via <a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a>.</li>
<li>Supports allocation via <a class="reference internal" href="../glossary/a.html#term-allocation-point"><em class="xref std std-term">allocation points</em></a>. If an allocation
point is created in an MVFF pool, the call to
<a class="reference internal" href="../topic/allocation.html#mps_ap_create" title="mps_ap_create"><tt class="xref c c-func docutils literal"><span class="pre">mps_ap_create()</span></tt></a> takes no additional parameters.</li>
<li>Supports deallocation via <a class="reference internal" href="../topic/allocation.html#mps_free" title="mps_free"><tt class="xref c c-func docutils literal"><span class="pre">mps_free()</span></tt></a>.</li>
<li>Supports <a class="reference internal" href="../glossary/a.html#term-allocation-frame"><em class="xref std std-term">allocation frames</em></a> but does not use them to improve
the efficiency of stack-like allocation.</li>
<li>Supports <a class="reference internal" href="../glossary/s.html#term-segregated-allocation-cache"><em class="xref std std-term">segregated allocation caches</em></a>.</li>
<li>There are no garbage collections in this pool.</li>
<li>Blocks may not contain <a class="reference internal" href="../glossary/r.html#term-reference"><em class="xref std std-term">references</em></a> to blocks in automatically
managed pools (unless these are registered as <a class="reference internal" href="../glossary/r.html#term-root"><em class="xref std std-term">roots</em></a>).</li>
<li>Allocations may be variable in size.</li>
<li>The <a class="reference internal" href="../glossary/a.html#term-alignment"><em class="xref std std-term">alignment</em></a> of blocks is configurable, but may not be
smaller than the <a class="reference internal" href="../glossary/n.html#term-natural-alignment"><em class="xref std std-term">natural alignment</em></a> of the platform.</li>
<li>Blocks do not have <a class="reference internal" href="../glossary/d.html#term-dependent-object"><em class="xref std std-term">dependent objects</em></a>.</li>
<li>Blocks are not automatically <a class="reference internal" href="../glossary/r.html#term-reclaim"><em class="xref std std-term">reclaimed</em></a>.</li>
<li>Blocks are not <a class="reference internal" href="../glossary/s.html#term-scan"><em class="xref std std-term">scanned</em></a>.</li>
<li>Blocks are not protected by <a class="reference internal" href="../glossary/b.html#term-barrier-1"><em class="xref std std-term">barriers<sup>(1)</sup></em></a>.</li>
<li>Blocks do not <a class="reference internal" href="../glossary/m.html#term-moving-garbage-collector"><em class="xref std std-term">move</em></a>.</li>
<li>Blocks may not be registered for <a class="reference internal" href="../glossary/f.html#term-finalization"><em class="xref std std-term">finalization</em></a>.</li>
<li>Blocks must not belong to an <a class="reference internal" href="../glossary/o.html#term-object-format"><em class="xref std std-term">object format</em></a>.</li>
</ul>
</div>
<div class="section" id="mvff-interface">
<span id="index-2"></span><h2>11.2. MVFF interface<a class="headerlink" href="#mvff-interface" title="Permalink to this headline"></a></h2>
<div class="highlight-c"><div class="highlight"><pre><span class="cp">#include &quot;mpscmvff.h&quot;</span>
</pre></div>
</div>
<dl class="function">
<dt id="mps_class_mvff">
<a class="reference internal" href="../topic/pool.html#mps_class_t" title="mps_class_t">mps_class_t</a> <tt class="descname">mps_class_mvff</tt><big>(</big>void<big>)</big><a class="headerlink" href="#mps_class_mvff" title="Permalink to this definition"></a></dt>
<dd><p>Return the <a class="reference internal" href="../glossary/p.html#term-pool-class"><em class="xref std std-term">pool class</em></a> for an MVFF (Manual Variable First
Fit) <a class="reference internal" href="../glossary/p.html#term-pool"><em class="xref std std-term">pool</em></a>.</p>
<p>When creating an MVFF pool, <a class="reference internal" href="../topic/pool.html#mps_pool_create_k" title="mps_pool_create_k"><tt class="xref c c-func docutils literal"><span class="pre">mps_pool_create_k()</span></tt></a> may take
the following <a class="reference internal" href="../glossary/k.html#term-keyword-argument"><em class="xref std std-term">keyword arguments</em></a>:</p>
<ul class="simple">
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_EXTEND_BY" title="MPS_KEY_EXTEND_BY"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_EXTEND_BY</span></tt></a> (type <tt class="xref c c-type docutils literal"><span class="pre">size_t</span></tt>, default
65536) is the <a class="reference internal" href="../glossary/s.html#term-size"><em class="xref std std-term">size</em></a> of segment that the pool will request
from the <a class="reference internal" href="../glossary/a.html#term-arena"><em class="xref std std-term">arena</em></a>.</li>
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MEAN_SIZE" title="MPS_KEY_MEAN_SIZE"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MEAN_SIZE</span></tt></a> (type <tt class="xref c c-type docutils literal"><span class="pre">size_t</span></tt>, default 32)
is the predicted mean size of blocks that will be allocated from
the pool. This is a <em>hint</em> to the MPS: the pool will be less
efficient if this is wrong, but nothing will break.</li>
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_ALIGN" title="MPS_KEY_ALIGN"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_ALIGN</span></tt></a> (type <a class="reference internal" href="../topic/interface.html#mps_align_t" title="mps_align_t"><tt class="xref c c-type docutils literal"><span class="pre">mps_align_t</span></tt></a>, default is
smallest general purpose alignment for the architecture) is the
<a class="reference internal" href="../glossary/a.html#term-alignment"><em class="xref std std-term">alignment</em></a> of addresses for allocation (and freeing) in
the pool. If an unaligned size is passed to <a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a> or
<a class="reference internal" href="../topic/allocation.html#mps_free" title="mps_free"><tt class="xref c c-func docutils literal"><span class="pre">mps_free()</span></tt></a>, it will be rounded up to the pool&#8217;s alignment.
The minimum alignment supported by pools of this class is
<tt class="docutils literal"><span class="pre">sizeof(void</span> <span class="pre">*)</span></tt>.</li>
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_ARENA_HIGH" title="MPS_KEY_MVFF_ARENA_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_ARENA_HIGH</span></tt></a> (type <a class="reference internal" href="../topic/interface.html#mps_bool_t" title="mps_bool_t"><tt class="xref c c-type docutils literal"><span class="pre">mps_bool_t</span></tt></a>,
default false) determines whether new segments are acquired at high
addresses (if true), or at low addresses (if false).</li>
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_SLOT_HIGH" title="MPS_KEY_MVFF_SLOT_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_SLOT_HIGH</span></tt></a> <a class="footnote-reference" href="#not-ap" id="id1">[1]</a> (type <a class="reference internal" href="../topic/interface.html#mps_bool_t" title="mps_bool_t"><tt class="xref c c-type docutils literal"><span class="pre">mps_bool_t</span></tt></a>,
default false) determines whether to search for the highest
addressed free area (if true) or lowest (if false) when allocating
using <a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a>.</li>
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_FIRST_FIT" title="MPS_KEY_MVFF_FIRST_FIT"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_FIRST_FIT</span></tt></a> <a class="footnote-reference" href="#not-ap" id="id2">[1]</a> (type <a class="reference internal" href="../topic/interface.html#mps_bool_t" title="mps_bool_t"><tt class="xref c c-type docutils literal"><span class="pre">mps_bool_t</span></tt></a>, default
true) determines whether to allocate from the highest address in a
found free area (if true) or lowest (if false) when allocating
using <a class="reference internal" href="../topic/allocation.html#mps_alloc" title="mps_alloc"><tt class="xref c c-func docutils literal"><span class="pre">mps_alloc()</span></tt></a>.</li>
</ul>
<table class="docutils footnote" frame="void" id="not-ap" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label">[1]</td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id2">2</a>)</em> Allocation points are not affected by
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_SLOT_HIGH" title="MPS_KEY_MVFF_SLOT_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_SLOT_HIGH</span></tt></a> or
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_FIRST_FIT" title="MPS_KEY_MVFF_FIRST_FIT"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_FIRST_FIT</span></tt></a>.
They use a worst-fit policy in order to maximise the number of
in-line allocations.</td></tr>
</tbody>
</table>
<p>The defaults yield a a simple first-fit allocator. Specify
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_ARENA_HIGH" title="MPS_KEY_MVFF_ARENA_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_ARENA_HIGH</span></tt></a> and
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_SLOT_HIGH" title="MPS_KEY_MVFF_SLOT_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_SLOT_HIGH</span></tt></a> true, and
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_FIRST_FIT" title="MPS_KEY_MVFF_FIRST_FIT"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_FIRST_FIT</span></tt></a> false to get a first-fit
allocator that works from the top of memory downwards.
Other combinations may be useful in special circumstances.</p>
<p>For example:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">MPS_ARGS_BEGIN</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> <span class="p">{</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_EXTEND_BY</span><span class="p">,</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="p">);</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_MEAN_SIZE</span><span class="p">,</span> <span class="mi">32</span><span class="p">);</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_ALIGN</span><span class="p">,</span> <span class="mi">8</span><span class="p">);</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_MVFF_ARENA_HIGH</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_MVFF_SLOT_HIGH</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">MPS_ARGS_ADD</span><span class="p">(</span><span class="n">ARGS</span><span class="p">,</span> <span class="n">MPS_KEY_MVFF_FIRST_FIT</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
<span class="n">MPS_ARGS_DONE</span><span class="p">(</span><span class="n">args</span><span class="p">);</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">mps_pool_create_k</span><span class="p">(</span><span class="o">&amp;</span><span class="n">pool</span><span class="p">,</span> <span class="n">arena</span><span class="p">,</span> <span class="n">mps_class_mvff</span><span class="p">(),</span> <span class="n">args</span><span class="p">);</span>
<span class="p">}</span> <span class="n">MPS_ARGS_END</span><span class="p">(</span><span class="n">args</span><span class="p">);</span>
</pre></div>
</div>
<div class="admonition-deprecated admonition">
<p class="first admonition-title">Deprecated</p>
<p>starting with version 1.112.</p>
<p>When using <a class="reference internal" href="../topic/pool.html#mps_pool_create" title="mps_pool_create"><tt class="xref c c-func docutils literal"><span class="pre">mps_pool_create()</span></tt></a>, pass the arguments like
this:</p>
<div class="last highlight-c"><div class="highlight"><pre><span class="n">mps_res_t</span> <span class="n">mps_pool_create</span><span class="p">(</span><span class="n">mps_pool_t</span> <span class="o">*</span><span class="n">pool_o</span><span class="p">,</span> <span class="n">mps_arena_t</span> <span class="n">arena</span><span class="p">,</span>
<span class="n">mps_class_t</span> <span class="n">mps_class_mvff</span><span class="p">(),</span>
<span class="n">mps_size_t</span> <span class="n">extend_size</span><span class="p">,</span>
<span class="n">mps_size_t</span> <span class="n">average_size</span><span class="p">,</span>
<span class="n">mps_align_t</span> <span class="n">alignment</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">slot_high</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">arena_high</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">first_fit</span><span class="p">)</span>
</pre></div>
</div>
</div>
</dd></dl>
<dl class="function">
<dt id="mps_class_mvff_debug">
<a class="reference internal" href="../topic/pool.html#mps_class_t" title="mps_class_t">mps_class_t</a> <tt class="descname">mps_class_mvff_debug</tt><big>(</big>void<big>)</big><a class="headerlink" href="#mps_class_mvff_debug" title="Permalink to this definition"></a></dt>
<dd><p>A <a class="reference internal" href="../topic/debugging.html#topic-debugging"><em>debugging</em></a> version of the MVFF pool
class.</p>
<p>When creating a debugging MVFF pool, <a class="reference internal" href="../topic/pool.html#mps_pool_create_k" title="mps_pool_create_k"><tt class="xref c c-func docutils literal"><span class="pre">mps_pool_create_k()</span></tt></a>
requires seven <a class="reference internal" href="../glossary/k.html#term-keyword-argument"><em class="xref std std-term">keyword arguments</em></a>.</p>
<ul class="simple">
<li><a class="reference internal" href="../design/poolmvff.html#MPS_KEY_EXTEND_BY" title="MPS_KEY_EXTEND_BY"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_EXTEND_BY</span></tt></a>, <a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MEAN_SIZE" title="MPS_KEY_MEAN_SIZE"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MEAN_SIZE</span></tt></a>,
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_ALIGN" title="MPS_KEY_ALIGN"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_ALIGN</span></tt></a>, <a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_ARENA_HIGH" title="MPS_KEY_MVFF_ARENA_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_ARENA_HIGH</span></tt></a>,
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_SLOT_HIGH" title="MPS_KEY_MVFF_SLOT_HIGH"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_SLOT_HIGH</span></tt></a>, and
<a class="reference internal" href="../design/poolmvff.html#MPS_KEY_MVFF_FIRST_FIT" title="MPS_KEY_MVFF_FIRST_FIT"><tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_MVFF_FIRST_FIT</span></tt></a> are as described above, and
<tt class="xref c c-macro docutils literal"><span class="pre">MPS_KEY_POOL_DEBUG_OPTIONS</span></tt> specifies the debugging
:c:options. See <tt class="xref c c-type docutils literal"><span class="pre">mps_debug_option_s</span></tt>.</li>
</ul>
<div class="admonition-deprecated admonition">
<p class="first admonition-title">Deprecated</p>
<p>starting with version 1.112.</p>
<p>When using <a class="reference internal" href="../topic/pool.html#mps_pool_create" title="mps_pool_create"><tt class="xref c c-func docutils literal"><span class="pre">mps_pool_create()</span></tt></a>, pass the debugging
options, and other arguments like this:</p>
<div class="last highlight-c"><div class="highlight"><pre><span class="n">mps_res_t</span> <span class="n">mps_pool_create</span><span class="p">(</span><span class="n">mps_pool_t</span> <span class="o">*</span><span class="n">pool_o</span><span class="p">,</span> <span class="n">mps_arena_t</span> <span class="n">arena</span><span class="p">,</span>
<span class="n">mps_class_t</span> <span class="n">mps_class_mvff_debug</span><span class="p">(),</span>
<span class="n">mps_debug_option_s</span> <span class="n">debug_option</span><span class="p">,</span>
<span class="n">mps_size_t</span> <span class="n">extend_size</span><span class="p">,</span>
<span class="n">mps_size_t</span> <span class="n">average_size</span><span class="p">,</span>
<span class="n">mps_align_t</span> <span class="n">alignment</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">slot_high</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">arena_high</span><span class="p">,</span>
<span class="n">mps_bool_t</span> <span class="n">first_fit</span><span class="p">)</span>
</pre></div>
</div>
</div>
</dd></dl>
</div>
<div class="section" id="mvff-introspection">
<span id="index-3"></span><h2>11.3. MVFF introspection<a class="headerlink" href="#mvff-introspection" title="Permalink to this headline"></a></h2>
<div class="highlight-c"><div class="highlight"><pre><span class="cp">#include &quot;mpscmvff.h&quot;</span>
</pre></div>
</div>
<dl class="function">
<dt id="mps_mvff_free_size">
size_t <tt class="descname">mps_mvff_free_size</tt><big>(</big><a class="reference internal" href="../topic/pool.html#mps_pool_t" title="mps_pool_t">mps_pool_t</a><em>&nbsp;pool</em><big>)</big><a class="headerlink" href="#mps_mvff_free_size" title="Permalink to this definition"></a></dt>
<dd><p>Return the total amount of free space in an MVFF pool.</p>
<p><tt class="docutils literal"><span class="pre">pool</span></tt> is the MVFF pool.</p>
<p>Returns the total free space in the pool, in <a class="reference internal" href="../glossary/b.html#term-byte-1"><em class="xref std std-term">bytes<sup>(1)</sup></em></a>.</p>
</dd></dl>
<dl class="function">
<dt id="mps_mvff_size">
size_t <tt class="descname">mps_mvff_size</tt><big>(</big><a class="reference internal" href="../topic/pool.html#mps_pool_t" title="mps_pool_t">mps_pool_t</a><em>&nbsp;pool</em><big>)</big><a class="headerlink" href="#mps_mvff_size" title="Permalink to this definition"></a></dt>
<dd><p>Return the total size of an MVFF pool.</p>
<p><tt class="docutils literal"><span class="pre">pool</span></tt> is the MVFF pool.</p>
<p>Returns the total size of the pool, in <a class="reference internal" href="../glossary/b.html#term-byte-1"><em class="xref std std-term">bytes<sup>(1)</sup></em></a>. This
is the sum of allocated space and free space.</p>
</dd></dl>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">11. MVFF (Manual Variable First Fit)</a><ul>
<li><a class="reference internal" href="#mvff-properties">11.1. MVFF properties</a></li>
<li><a class="reference internal" href="#mvff-interface">11.2. MVFF interface</a></li>
<li><a class="reference internal" href="#mvff-introspection">11.3. MVFF introspection</a></li>
</ul>
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<h4>Previous topic</h4>
<p class="topless"><a href="mv.html"
title="previous chapter">10. MV (Manual Variable)</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="mvt.html"
title="next chapter">12. MVT (Manual Variable Temporal)</a></p><h4>Downloads</h4>
<p class="topless">
<a href="http://www.ravenbrook.com/project/mps/release/1.111.0/">MPS Kit release 1.111.0</a><br>
<a href="http://www.ravenbrook.com/project/mps/release/">All MPS Kit releases</a>
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<h4>Issues</h4>
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<a href="http://www.ravenbrook.com/project/mps/issue/?action=list&amp;view=status%3dopen&amp;display=Job:Priority:Title&amp;sort=Priority">Known issues</a><br>
<a href="http://www.ravenbrook.com/project/mps/issue/?action=fixed&release_fixed=1.111.0">Issues fixed in release 1.111.0</a>
</p><h4>Contact us</h4>
<p class="topless"><a href="mailto:mps-questions@ravenbrook.com">mps-questions@ravenbrook.com</a></p>
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