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Posted to commits@mynewt.apache.org by ad...@apache.org on 2016/06/20 21:42:32 UTC
[30/51] [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/callout/os_callout_reset/index.html
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diff --git a/develop/os/core_os/callout/os_callout_reset/index.html b/develop/os/core_os/callout/os_callout_reset/index.html
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@@ -0,0 +1,774 @@
+<!DOCTYPE html>
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+ <h2 id="os_callout_reset"><font color="#F2853F" style="font-size:24pt"> os_callout_reset </font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">void os_callout_reset(struct os_callout *c, int32_t timo)
+</pre></div>
+
+
+<p>Resets the callout to happen <em>timo</em> in OS ticks.</p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>c</td>
+<td>Pointer to os_callout being reset</td>
+</tr>
+<tr>
+<td>timo</td>
+<td>OS ticks the timer is being set to</td>
+</tr>
+</tbody>
+</table>
+<h4 id="returned-values">Returned values</h4>
+<p>N/A</p>
+<h4 id="notes">Notes</h4>
+<h4 id="example">Example</h4>
+<p><Add text to set up the context for the example here></p>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">/* Re-start the timer (run every 50 msecs) */
+os_callout_reset(&g_bletest_timer.cf_c, OS_TICKS_PER_SEC / 20);
+</pre></div>
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http://git-wip-us.apache.org/repos/asf/incubator-mynewt-site/blob/d18c34dd/develop/os/core_os/callout/os_callout_stop/index.html
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diff --git a/develop/os/core_os/callout/os_callout_stop/index.html b/develop/os/core_os/callout/os_callout_stop/index.html
new file mode 100644
index 0000000..808c39b
--- /dev/null
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+ <h2 id="os_callout_stop"><font color="#F2853F" style="font-size:24pt"> os_callout_stop </font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">void os_callout_stop(struct os_callout *c)
+</pre></div>
+
+
+<p>Disarms a timer.</p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>c</td>
+<td>Pointer to os_callout being stopped</td>
+</tr>
+</tbody>
+</table>
+<h4 id="returned-values">Returned values</h4>
+<p>N/A</p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">struct os_callout_func g_native_cputimer;
+
+ os_callout_stop(&g_native_cputimer.cf_c);
+</pre></div>
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+
+ <h1 id="schedulercontext-switching">Scheduler/Context Switching</h1>
+<p>Scheduler's job is to maintain the list of tasks and decide which one should be running next.</p>
+<h2 id="description">Description</h2>
+<p>Task states can be <em>running</em>, <em>ready to run</em> or <em>sleeping</em>.</p>
+<p>When task is <em>running</em>, CPU is executing in that task's context. The program counter (PC) is pointing to instructions task wants to execute and stack pointer (SP) is pointing to task's stack.</p>
+<p>Task which is <em>ready to run</em> wants to get on the CPU to do its work.</p>
+<p>Task which is <em>sleeping</em> has no more work to do. It's waiting for someone else to wake it up.</p>
+<p>Scheduler algorithm is simple: from among the tasks which are ready to run, pick the the one with highest priority (lowest numeric value in task's t_prio field), and make its state <em>running</em>.</p>
+<p>Tasks which are either <em>running</em> or <em>ready to run</em> are kept in linked list <code>g_os_run_list</code>. This list is ordered by priority.</p>
+<p>Tasks which are <em>sleeping</em> are kept in linked list <code>g_os_sleep_list</code>.</p>
+<p>Scheduler has a CPU architecture specific component; this code is responsible for swapping in the task which should be <em>running</em>. This process is called context switch. During context switching the state of the CPU (e.g. registers) for the currently <em>running</em> task is stored and the new task is swapped in.</p>
+<h2 id="list-of-functions">List of Functions</h2>
+<p>The functions available in context_switch are:</p>
+<ul>
+<li><a href="../os_sched/">os_sched</a></li>
+<li><a href="../os_arch_ctx_sw/">os_arch_ctx_sw</a></li>
+<li><a href="../os_sched_ctx_sw_hook/">os_sched_ctx_sw_hook</a></li>
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+
+ <h2 id="os_arch_ctx_sw"><font color="#F2853F" style="font-size:24pt"> os_arch_ctx_sw </font></h2>
+<p>void os_arch_ctx_sw(struct os_task *next_t)</p>
+<p>Change the state of task pointed by <em>next_t</em> to be <em>running</em>.</p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>next_t</td>
+<td>Pointer to task which must run next</td>
+</tr>
+</tbody>
+</table>
+<h4 id="returned-values">Returned values</h4>
+<p>N/A</p>
+<h4 id="notes">Notes</h4>
+<p>This would get called from another task's context.</p>
+<h4 id="example">Example</h4>
+<p><Add text to set up the context for the example here></p>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">void</span>
+ <span style="color: #000000">os_sched</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_task</span> <span style="color: #000000">*</span><span style="color: #A90D91">next_t</span>)
+ {
+ <span style="color: #A90D91">os_sr_t</span> <span style="color: #000000">sr</span>;
+
+ <span style="color: #000000">OS_ENTER_CRITICAL</span>(<span style="color: #000000">sr</span>);
+
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">!</span><span style="color: #A90D91">next_t</span>) {
+ <span style="color: #A90D91">next_t</span> <span style="color: #000000">=</span> <span style="color: #000000">os_sched_next_task</span>();
+ }
+
+ <span style="color: #A90D91">if</span> (<span style="color: #A90D91">next_t</span> <span style="color: #000000">!=</span> <span style="color: #000000">g_current_task</span>) {
+ <span style="color: #000000">os_arch_ctx_sw</span>(<span style="color: #A90D91">next_t</span>);
+ }
+
+ <span style="color: #000000">OS_EXIT_CRITICAL</span>(<span style="color: #000000">sr</span>);
+ }
+</pre></div>
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diff --git a/develop/os/core_os/context_switch/os_sched/index.html b/develop/os/core_os/context_switch/os_sched/index.html
new file mode 100644
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+ <h2 id="os_sched"><font color="#F2853F" style="font-size:24pt"> os_sched </font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">void</span> <span style="color: #000000">os_sched</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_task</span> <span style="color: #000000">*</span><span style="color: #A90D91">next_t</span>)
+</pre></div>
+
+
+<p>Performs context switch if needed. If <em>next_t</em> is set, that task will be made <em>running</em>. If <em>next_t</em> is NULL, highest priority <em>ready to run</em> is swapped in. This function can be called when new tasks were made <em>ready to run</em> or if the current task is moved to <em>sleeping</em> state.</p>
+<p>This function will call the architecture specific routine to swap in the new task.</p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>next_t</td>
+<td>Pointer to task which must run next (optional)</td>
+</tr>
+</tbody>
+</table>
+<h4 id="returned-values">Returned values</h4>
+<p>N/A</p>
+<h4 id="notes">Notes</h4>
+<p>Interrupts must be disabled when calling this.</p>
+<h4 id="example">Example</h4>
+<p><Add text to set up the context for the example here></p>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">os_error_t</span>
+<span style="color: #000000">os_mutex_release</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mutex</span> <span style="color: #000000">*mu</span>)
+{
+ ...
+ <span style="color: #000000">OS_EXIT_CRITICAL</span>(<span style="color: #000000">sr</span>);
+
+ <span style="color: #177500">/* Re-schedule if needed */</span>
+ <span style="color: #A90D91">if</span> (<span style="color: #000000">resched</span>) {
+ <span style="color: #000000">os_sched</span>(<span style="color: #000000">rdy</span>);
+ }
+
+ <span style="color: #A90D91">return</span> <span style="color: #000000">OS_OK</span>;
+
+}
+</pre></div>
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