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| Version 1.2.0 is not the most recent version of the Apache Mynewt |
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| <h1 id="callout">Callout</h1> |
| <p>Callouts are MyNewt OS timers.</p> |
| <h3 id="description">Description</h3> |
| <p>Callout is a way of setting up an OS timer. When the timer fires, it is delivered as an event to task's event queue.</p> |
| <p>User would initialize their callout structure using <em>os_callout_init()</em>, or <em>os_callout_func_init()</em> and then arm it with <em>os_callout_reset()</em>.</p> |
| <p>If user wants to cancel the timer before it expires, they can either use <em>os_callout_reset()</em> to arm it for later expiry, or stop it altogether by calling <em>os_callout_stop()</em>.</p> |
| <p>There are 2 different options for data structure to use. First is <em>struct os_callout</em>, which is a bare-bones version. You would initialize this with <em>os_callout_init()</em>.</p> |
| <p>Second option is <em>struct os_callout_func</em>. This you can use if you expect to have multiple different types of timers in your task, running concurrently. The structure contains a function pointer, and you would call that function from your task's event processing loop.</p> |
| <p>Time unit when arming the timer is OS ticks. This rate of this ticker depends on the platform this is running on. You should use OS define <em>OS_TICKS_PER_SEC</em> to convert wallclock time to OS ticks.</p> |
| <p>Callout timer fires out just once. For periodic timer type of operation you need to rearm it once it fires.</p> |
| <h3 id="data-structures">Data structures</h3> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>struct os_callout { |
| struct os_event c_ev; |
| struct os_eventq *c_evq; |
| uint32_t c_ticks; |
| TAILQ_ENTRY(os_callout) c_next; |
| }; |
| </code></pre></div> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Element</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>c_ev</td> |
| <td>Event structure of this callout</td> |
| </tr> |
| <tr> |
| <td>c_evq</td> |
| <td>Event queue where this callout is placed on timer expiry</td> |
| </tr> |
| <tr> |
| <td>c_ticks</td> |
| <td>OS tick amount when timer fires</td> |
| </tr> |
| <tr> |
| <td>c_next</td> |
| <td>Linkage to other unexpired callouts</td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>struct os_callout_func { |
| struct os_callout cf_c; |
| os_callout_func_t cf_func; |
| void *cf_arg; |
| }; |
| </code></pre></div> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Element</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>cf_c</td> |
| <td>struct os_callout. See above</td> |
| </tr> |
| <tr> |
| <td>cf_func</td> |
| <td>Function pointer which should be called by event queue processing</td> |
| </tr> |
| <tr> |
| <td>cf_arg</td> |
| <td>Generic void * argument to that function</td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="list-of-functions">List of Functions</h3> |
| <p>The functions available in callout are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th><strong>Function</strong></th> |
| <th><strong>Description</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a href="os_callout_func_init">os_callout_func_init</a></td> |
| <td>Initializes the given callout function struct.</td> |
| </tr> |
| <tr> |
| <td><a href="os_callout_init">os_callout_init</a></td> |
| <td>Initializes the given callout struct.</td> |
| </tr> |
| <tr> |
| <td><a href="os_callout_queued">os_callout_queued</a></td> |
| <td>Checks whether the given callout has been armed.</td> |
| </tr> |
| <tr> |
| <td><a href="os_callout_reset">os_callout_reset</a></td> |
| <td>Resets the callout to happen in the given number of OS ticks.</td> |
| </tr> |
| <tr> |
| <td><a href="os_callout_stop">os_callout_stop</a></td> |
| <td>Disarms a timer.</td> |
| </tr> |
| </tbody> |
| </table> |
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