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Posted to commits@mynewt.apache.org by ad...@apache.org on 2016/06/20 21:42:18 UTC
[16/51] [partial] incubator-mynewt-site git commit: generated two
versions of docs - develop and v0_9_0
http://git-wip-us.apache.org/repos/asf/incubator-mynewt-site/blob/d18c34dd/develop/os/core_os/msys/msys/index.html
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+ <h1 id="msys">Msys</h1>
+<p>Msys stands for "system mbufs" and is a set of API built on top of the mbuf code. The basic idea behind msys is the following. The developer can create different size mbuf pools and register them with msys. The application then allocates mbufs using the msys API (as opposed to the mbuf API). The msys code will choose the mbuf pool with the smallest mbufs that can accommodate the requested size. </p>
+<p>Let us walk through an example where the user registers three mbuf pools with msys: one with 32 byte mbufs, one with 256 and one with 2048. If the user requests an mbuf with 10 bytes, the 32-byte mbuf pool is used. If the request is for 33 bytes the 256 byte mbuf pool is used. If an mbuf data size is requested that is larger than any of the pools (say, 4000 bytes) the largest pool is used. While this behaviour may not be optimal in all cases that is the currently implemented behaviour. All this means is that the user is not guaranteed that a single mbuf can hold the requested data.</p>
+<p>The msys code will not allocate an mbuf from a larger pool if the chosen mbuf pool is empty. Similarly, the msys code will not chain together a number of smaller mbufs to accommodate the requested size. While this behaviour may change in future implementations the current code will simply return NULL. Using the above example, say the user requests 250 bytes. The msys code chooses the appropriate pool (i.e. the 256 byte mbuf pool) and attempts to allocate an mbuf from that pool. If that pool is empty, NULL is returned even though the 32 and 2048 byte pools are not empty.</p>
+<p>Note that no added descriptions on how to use the msys API are presented here (other than in the API descriptions themselves) as the msys API is used in exactly the same manner as the mbuf API. The only difference is that mbuf pools are added to msys by calling <code>os_msys_register().</code></p>
+<p><br> </p>
+<h3 id="list-of-functions">List of Functions</h3>
+<p>The functions available in msys are:</p>
+<ul>
+<li><a href="../os_msys_get/">os_msys_get</a></li>
+<li><a href="../os_msys_get_pkthdr/">os_msys_get_pkthdr</a></li>
+<li><a href="../os_msys_register/">os_msys_register</a></li>
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http://git-wip-us.apache.org/repos/asf/incubator-mynewt-site/blob/d18c34dd/develop/os/core_os/msys/os_msys_get/index.html
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diff --git a/develop/os/core_os/msys/os_msys_get/index.html b/develop/os/core_os/msys/os_msys_get/index.html
new file mode 100644
index 0000000..1b29dca
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+ <h2 id="os_msys_get"><font color="#F2853F" style="font-size:24pt">os_msys_get</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*os_msys_get</span>(<span style="color: #A90D91">uint16_t</span> <span style="color: #000000">dsize</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">leadingspace</span>)
+</pre></div>
+
+
+<p>Retrieve an mbuf from the system mbuf pools with <em>leadingspace</em> bytes available in the mbuf.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>dsize</td>
+<td>Minimum requested size of mbuf. Actual mbuf allocated may not accommodate <em>dsize</em></td>
+</tr>
+<tr>
+<td>leadingspace</td>
+<td>Number of bytes for leading space in mbuf (space at start of mbuf)</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>Pointer to mbuf or NULL if no mbufs were available.</p>
+<p><br></p>
+<h4 id="notes">Notes</h4>
+<p>As described in the overview section, <code>os_msys_get()</code> may return an mbuf that is smaller than dsize, meaning that the mbuf user data buffer does not have enough contiguous space to hold <em>dsize</em> bytes.</p>
+<p>This API will not return an mbuf from a larger mbuf pool if the appropriate msys mbuf pool is empty. See the overview for more information.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+
+ <span style="color: #177500">/* Allocate an mbuf with hopefully at least 100 bytes in its user data buffer */</span>
+ <span style="color: #000000">om</span> <span style="color: #000000">=</span> <span style="color: #000000">os_msys_get</span>(<span style="color: #1C01CE">100</span>, <span style="color: #1C01CE">0</span>);
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">!om</span>) {
+ <span style="color: #177500">/* No mbufs available. */</span>
+ <span style="color: #A90D91">return</span> <span style="color: #000000">-</span><span style="color: #1C01CE">1</span>;
+ }
+}
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+ <h2 id="os_msys_get_pkthdr"><font color="#F2853F" style="font-size:24pt">os_msys_get_pkthdr</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*os_msys_get_pkthdr</span>(<span style="color: #A90D91">uint16_t</span> <span style="color: #000000">dsize</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">user_hdr_len</span>)
+</pre></div>
+
+
+<p>Retrieve a packet header mbuf from the system mbuf pools with <em>user_hdr_len</em> bytes available for the user header in the mbuf.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>dsize</td>
+<td>Minimum requested size of mbuf. Actual mbuf allocated may not accommodate <em>dsize</em></td>
+</tr>
+<tr>
+<td>user_hdr_len</td>
+<td>Size, in of bytes, of user header in the mbuf</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>Pointer to mbuf or NULL if no mbufs were available.</p>
+<p><br></p>
+<h4 id="notes">Notes</h4>
+<p>The same notes apply to this API as to <code>os_msys_get()</code>.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+ <span style="color: #A90D91">struct</span> <span style="color: #000000">my_user_hdr_struct</span> <span style="color: #000000">my_usr_hdr</span>;
+
+ <span style="color: #177500">/*</span>
+<span style="color: #177500"> * Allocate an mbuf with hopefully at least 100 bytes in its user data buffer</span>
+<span style="color: #177500"> * and that has a user header of size sizeof(struct my_user_hdr_struct)</span>
+<span style="color: #177500"> */</span>
+ <span style="color: #000000">om</span> <span style="color: #000000">=</span> <span style="color: #000000">os_msys_get_pkthdr</span>(<span style="color: #1C01CE">100</span>, <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_user_hdr_struct</span>));
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">!om</span>) {
+ <span style="color: #177500">/* No mbufs available. */</span>
+ <span style="color: #A90D91">return</span> <span style="color: #000000">-</span><span style="color: #1C01CE">1</span>;
+ }
+}
+</pre></div>
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+<!DOCTYPE html>
+<html lang="en">
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+ <h2 id="os_msys_register"><font color="#F2853F" style="font-size:24pt">os_msys_register</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">int</span> <span style="color: #000000">os_msys_register</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf_pool</span> <span style="color: #000000">*new_pool</span>)
+</pre></div>
+
+
+<p>Register an mbuf pool for use as a system mbuf pool. The pool should be initialized prior to registration.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>new_pool</td>
+<td>Pointer to mbuf pool to add to system mbuf pools</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>0 on success; all other values indicate an error.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_msys_register</span>(<span style="color: #000000">&g_mbuf_pool</span>);
+ <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>);
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+ <h2 id="os_msys_reset"><font color="#F2853F" style="font-size:24pt">os_msys_reset</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">void</span> <span style="color: #000000">os_msys_reset</span>(<span style="color: #A90D91">void</span>)
+</pre></div>
+
+
+<p>Resets msys module. This de-registers all pools from msys but does nothing to the pools themselves (they still exist as mbuf pools).</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<p>None</p>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>None</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"> <span style="color: #000000">os_msys_reset</span>();
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