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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netmcore_buffer</title>
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<h1>Module <a href="type_Netmcore_buffer.html">Netmcore_buffer</a></h1>

<pre><span id="MODULENetmcore_buffer"><span class="keyword">module</span> Netmcore_buffer</span>: <code class="code">sig</code> <a href="Netmcore_buffer.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Shared buffer</p>

<p>One can add more data to the end of the buffer, and one can
    remove data from the beginning of the buffer.</p>

<p>Additions and deletions of data are atomic, and are strictly
    serialized. Read accesses can occur in parallel, and can even
    overlap with modifications (to some degree). It is, however,
    ensured that reads do not see the parallel modification, i.e.
    reads always base on the state from the beginning of the read
    operation.</p>

<p>It is not excluded that additions can be executed in parallel. If
    done this way, it is guaranteed that the effects of parallel
    additions are the same as if they were executed in a serial
    way. In particular, if an addition operation returns, this
    addition and all parallel additions affecting preceding index
    positions must be done. (The current implementation does not
    attempt this optimization.)</p>

<p>Index positions are "eternal", i.e. the index position of a
    byte does not change when preceding bytes are deleted. Instead,
    a deletion merely advances the start index of the valid data
    (which is not necessarily 0). This model is more consistent
    with parallel modifications.</p>

<p>On 32 bit platforms it can happen that index positions wrap
    around (at 1G). The position following <code class="code">max_int</code> is 0. The
    length is restricted to <code class="code">max_int-bsize</code> on these platforms.</p>
</div>
</div>
<hr width="100%">

<pre><span id="TYPEbuffer"><span class="keyword">type</span> <code class="type">'h</code> buffer</span> </pre>
<div class="info ">
<div class="info-desc">
<p>A buffer with a header of type <code class="code">'h</code></p>
</div>
</div>


<pre><span id="TYPEbuffer_descr"><span class="keyword">type</span> <code class="type">'h</code> buffer_descr</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The marshallable buffer descriptor</p>
</div>
</div>


<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type"><a href="Netmcore.html#TYPEres_id">Netmcore.res_id</a> -> int -> 'h -> 'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">create pool bsize h</code>: Creates a buffer in <code class="code">pool</code> with a block
      size of <code class="code">bsize</code>. The block size can be an arbitrary positive integer
      which is always rounded up to the next multiple of the page size
      of the operating system. Blocks are the units of allocation
      of memory.</p>
</div>
</div>

<pre><span id="VALdestroy"><span class="keyword">val</span> destroy</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Destroys the buffer</p>
</div>
</div>
<p>The valid index positions (e.g. for <code class="code">sub</code>) are <code class="code">start</code> to
    <code class="code">start+length-1</code>:</p>

<pre><span id="VALstart"><span class="keyword">val</span> start</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the start index</p>
</div>
</div>

<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the length</p>
</div>
</div>

<pre><span id="VALcontents"><span class="keyword">val</span> contents</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the full contents</p>
</div>
</div>

<pre><span id="VALsub"><span class="keyword">val</span> sub</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int -> int -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Returns a substring</p>
</div>
</div>

<pre><span id="VALblit_to_bytes"><span class="keyword">val</span> blit_to_bytes</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Blits contents to a string</p>
</div>
</div>

<pre><span id="VALblit_to_string"><span class="keyword">val</span> blit_to_string</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int -> Stdlib.Bytes.t -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use blit_to_bytes instead."</div>
</div>

<pre><span id="VALblit_to_memory"><span class="keyword">val</span> blit_to_memory</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Blits contents to a memory buffer</p>
</div>
</div>

<pre><span id="VALaccess"><span class="keyword">val</span> access</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -><br>       int -> (Stdlib.Bytes.t -> int -> int -> 'a) -> 'a</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">access b pos f</code>: Gets access to the internal string backing the
      byte at position <code class="code">pos</code>. The function <code class="code">f</code> is called as <code class="code">f s k n</code>
      so that <code class="code">s.[k]</code> is the requested byte at <code class="code">pos</code>. The number <code class="code">n</code>
      is the number of valid bytes in the string.</p>

<p>During the execution of <code class="code">f</code> the string <code class="code">s</code> is pinned and cannot be
      deleted by the garbage collector.</p>
</div>
</div>

<pre><span id="VALadd_string"><span class="keyword">val</span> add_string</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Adds a string to the end of the buffer</p>
</div>
</div>

<pre><span id="VALadd_substring"><span class="keyword">val</span> add_substring</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Adds a sub string to the end of the buffer</p>
</div>
</div>

<pre><span id="VALadd_sub_string"><span class="keyword">val</span> add_sub_string</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> string -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use add_substring instead."</div>
</div>

<pre><span id="VALadd_submemory"><span class="keyword">val</span> add_submemory</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Adds a sub memory buffer to the end of the buffer</p>
</div>
</div>

<pre><span id="VALadd_sub_memory"><span class="keyword">val</span> add_sub_memory</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> <a href="Netsys_mem.html#TYPEmemory">Netsys_mem.memory</a> -> int -> int -> unit</code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>"Use add_submemory instead."</div>
</div>

<pre><span id="VALdelete_hd"><span class="keyword">val</span> delete_hd</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> int -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">delete_hd b n</code>: Deletes <code class="code">n</code> bytes from the beginning of the buffer.
      This means that the <code class="code">start</code> index is increased by <code class="code">n</code>.</p>
</div>
</div>

<pre><span id="VALclear"><span class="keyword">val</span> clear</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Deletes all contents of the buffer</p>
</div>
</div>

<pre><span id="VALheader"><span class="keyword">val</span> header</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> 'h</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the header</p>
</div>
</div>

<pre><span id="VALdescr_of_buffer"><span class="keyword">val</span> descr_of_buffer</span> : <code class="type">'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> 'h <a href="Netmcore_buffer.html#TYPEbuffer_descr">buffer_descr</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the descriptor</p>
</div>
</div>

<pre><span id="VALbuffer_of_descr"><span class="keyword">val</span> buffer_of_descr</span> : <code class="type"><a href="Netmcore.html#TYPEres_id">Netmcore.res_id</a> -><br>       'h <a href="Netmcore_buffer.html#TYPEbuffer_descr">buffer_descr</a> -> 'h <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a></code></pre><div class="info ">
<div class="info-desc">
<p>Look up the buffer for this descriptor</p>
</div>
</div>

<pre><span id="VALheap"><span class="keyword">val</span> heap</span> : <code class="type">'a <a href="Netmcore_buffer.html#TYPEbuffer">buffer</a> -> Stdlib.Obj.t <a href="Netmcore_heap.html#TYPEheap">Netmcore_heap.heap</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the underlying heap</p>
</div>
</div>
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