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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>YAVRTOS: task.c File Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.4 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>task.c File Reference</h1><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Defines</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#7a659118f2c006c2570742f06614eace">semaphore_triggered</a>(current, required) ((current) - (required) >= 0)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Has a semaphore been triggered? <a href="#7a659118f2c006c2570742f06614eace"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#g434ebb7bd09016853228960c1c91fe22">TASK_STATE_STARTING</a> 1</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Starting. <a href="group__taskstategroup.html#g434ebb7bd09016853228960c1c91fe22"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#gf986aeb5acf04c1377115c3c58d6066d">TASK_STATE_RUNNING</a> 2</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Running. <a href="group__taskstategroup.html#gf986aeb5acf04c1377115c3c58d6066d"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#g99d0b31c3a0e5525ffff0334a9cf48f5">TASK_STATE_WAITING_TO_STOP</a> 3</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Waiting for the task to release all of its mutexes before stopping. <a href="group__taskstategroup.html#g99d0b31c3a0e5525ffff0334a9cf48f5"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#g3a4b299f206860e7484eba9176fef9be">TASK_STATE_STOPPING</a> 4</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Stopping. <a href="group__taskstategroup.html#g3a4b299f206860e7484eba9176fef9be"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#g6b6ae39d5fc55cb15af274fdb8f77466">TASK_STATE_CLEANING_UP</a> 5</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Cleaning up. <a href="group__taskstategroup.html#g6b6ae39d5fc55cb15af274fdb8f77466"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__taskstategroup.html#g73fed596e3e9e61b17ada47b4e476bcc">TASK_STATE_STOPPED</a> 6</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Stopped. <a href="group__taskstategroup.html#g73fed596e3e9e61b17ada47b4e476bcc"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#ec2cb6acfd1cbdf565d79d8e46366142">set_task_state</a>(taskptr, req_state) (taskptr)->status = (req_state)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Set the state of a task - this macro makes it easier to put other information into task.status </p> <a href="#ec2cb6acfd1cbdf565d79d8e46366142"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#73254a06adc660dd59b1770c9b9f3520">get_task_state</a>(taskptr) ((taskptr)->status)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Get the state of a task - this macro makes it easier to put other information into task.status </p> <a href="#73254a06adc660dd59b1770c9b9f3520"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#95d8d92f8a304e063ce50c912412181c">executing_isr</a>() (system.interrupted_task)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Are we currently executing an ISR? </p> <a href="#95d8d92f8a304e063ce50c912412181c"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#87b5d6c508a0039ac89b09c3c71f6717">rtos_started</a>() (<a class="el" href="group__task.html#g4743b3673a8794b8e7bd0b6c91a63cd5">current_task</a>)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Has the RTOS been started? </p> <a href="#87b5d6c508a0039ac89b09c3c71f6717"></a><br></td></tr><tr><td colspan="2"><br><h2>Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#c85c4cc0394680fc16ce32fcc987e62e">task_starter</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>The entry point for all tasks </p> <a href="#c85c4cc0394680fc16ce32fcc987e62e"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#b1c4cc247bd379e340e25bd86911919d">task_stopper</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>The entry point for all tasks that are stopping </p> <a href="#b1c4cc247bd379e340e25bd86911919d"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#ge1337adc1d63d7cd874a376d6513c04a">stop_task</a> (<a class="el" href="structtask__t.html">task_t</a> *t, uint8_t wait_for_mutexes)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Stop a task. <a href="group__task.html#ge1337adc1d63d7cd874a376d6513c04a"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structtask__t.html">task_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g934155282a1d689b554e90b5138e5135">reserve_task</a> (uint16_t stacklen, uint8_t pri, <a class="el" href="structmutex__t.html">mutex_t</a> *memory_mutex)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Tasks are kept in a linked list in memory - this function reserves an "empty" task on that list, ready to be subsequently utilised by a call to <a class="el" href="group__task.html#g9b849c9a0e0b29417cf47da99226dcc3" title="Create a task, ready to be run.">create_task()</a>. <a href="group__task.html#g934155282a1d689b554e90b5138e5135"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structtask__t.html">task_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g9b849c9a0e0b29417cf47da99226dcc3">create_task</a> (void(*proc)(void *), void(*cleanup)(), void *init_data, uint16_t stacklen, uint8_t pri, <a class="el" href="structmutex__t.html">mutex_t</a> *memory_mutex)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Create a task, ready to be run. <a href="group__task.html#g9b849c9a0e0b29417cf47da99226dcc3"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mutex.html#gdff77e0b451c30c07d2990e669f937c5">lock_on</a> (<a class="el" href="structmutex__t.html">mutex_t</a> *m)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Lock on a mutex. <a href="group__mutex.html#gdff77e0b451c30c07d2990e669f937c5"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mutex.html#g327f419711064b7407f6f47011221cc4">lock_off</a> (<a class="el" href="structmutex__t.html">mutex_t</a> *m)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Unlock a mutex. <a href="group__mutex.html#g327f419711064b7407f6f47011221cc4"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__semaphore.html#g3c18e0f867a2f36f1510aebf5ad4c0e2">get_semaphore_value</a> (<a class="el" href="structsemaphore__t.html">semaphore_t</a> *s)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current value of a semaphore. <a href="group__semaphore.html#g3c18e0f867a2f36f1510aebf5ad4c0e2"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__semaphore.html#g45243d3de7a253445deeb57ee4c8cc96">wait_for_min_value</a> (<a class="el" href="structsemaphore__t.html">semaphore_t</a> *p, int16_t value)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Wait for a semaphore to reach at least a particular value. <a href="group__semaphore.html#g45243d3de7a253445deeb57ee4c8cc96"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__semaphore.html#g291edcd883e2d0bc17f85419e21069ff">wait_for_increment_of</a> (<a class="el" href="structsemaphore__t.html">semaphore_t</a> *p, uint16_t amount)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Wait for a semaphore to increment its value by a certain amount. <a href="group__semaphore.html#g291edcd883e2d0bc17f85419e21069ff"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#aa4ee75536398ba2bd21466b13bdcd57">switch_task</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Perform a task switch </p> <a href="#aa4ee75536398ba2bd21466b13bdcd57"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__semaphore.html#g3cd218588dccb32b5b9072c7a75fb008">increment_semaphore_by</a> (<a class="el" href="structsemaphore__t.html">semaphore_t</a> *s, uint16_t amount)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Increment the value of a semaphore by the given amount. <a href="group__semaphore.html#g3cd218588dccb32b5b9072c7a75fb008"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#g9b7e62ecd1a61eda8cfa1229df0728ef">get_current_mbox_version</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current version of a mailbox. <a href="group__mailbox.html#g9b7e62ecd1a61eda8cfa1229df0728ef"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#g86030bb5345670ca374ddd20ef8e4ff6">read_mbox</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m, int16_t *version)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Read a mailbox. <a href="group__mailbox.html#g86030bb5345670ca374ddd20ef8e4ff6"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#g5dbb6937f6f93f6a1c14dec5b1c197c3">read_mbox_min_version</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m, int16_t *version)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Wait for a mailbox to reach at least a certain version, and then start reading from it. <a href="group__mailbox.html#g5dbb6937f6f93f6a1c14dec5b1c197c3"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structmailbox__t.html">mailbox_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#g31b8ee5f4cd547c128143d99ea1c4a96">release_mbox_read</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Function to call when finished reading from a mailbox. <a href="group__mailbox.html#g31b8ee5f4cd547c128143d99ea1c4a96"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#gd4cde27abfbedc7c8e854e76d71612dd">initialise_mbox</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m, void *data, const int16_t version)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Initialise a mailbox - this <b>must</b> be called on every mailbox before it is used. <a href="group__mailbox.html#gd4cde27abfbedc7c8e854e76d71612dd"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#9963b4ea6e571f04447db7fa4a826d81">mbox_is_empty</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Find out if a mailbox is "empty" (i.e. if there is no-one waiting to read it). <a href="#9963b4ea6e571f04447db7fa4a826d81"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#gc75646248d03b1413198765b07ba54ad">write_mbox</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m, void *data, uint8_t wait_for_receivers, uint8_t wait_for_empty_nullify)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Write to a mailbox. <a href="group__mailbox.html#gc75646248d03b1413198765b07ba54ad"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#g87f02ab5b46654ae26b06851b2390132">write_mbox_now</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m, void *data)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Attempt to write to a mailbox. <a href="group__mailbox.html#g87f02ab5b46654ae26b06851b2390132"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mailbox.html#gf670250659f0942849aa85f0f94af9f0">wait_for_receiver</a> (<a class="el" href="structmailbox__t.html">mailbox_t</a> *m)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Wait for a task to be suspended while trying to read from a mailbox. <a href="group__mailbox.html#gf670250659f0942849aa85f0f94af9f0"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">interrupt_store_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g6984a5336b36a4ca99682a2cf5ae044f">disable_interrupts</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Disable interrupts system-wide. <a href="group__task.html#g6984a5336b36a4ca99682a2cf5ae044f"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#gecf8a8e43c2afae89e46503ff1c887bf">restore_interrupts</a> (interrupt_store_t interrupts)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Restore the state of the system-wide interrupts. <a href="group__task.html#gecf8a8e43c2afae89e46503ff1c887bf"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g1a2a5bbefa85516b8c1d0e0361a834db">yield</a> ()</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Stop executing the current task and try and execute a higher-priority task or another task of the same priority. <a href="group__task.html#g1a2a5bbefa85516b8c1d0e0361a834db"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g1398c4d9f97349ea3fa7d91349298521">task_switcher_start</a> (void(*idle)(void *), void *idle_data, uint16_t idle_stacklen, uint16_t system_stacklen)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Start the whole process running. <a href="group__task.html#g1398c4d9f97349ea3fa7d91349298521"></a><br></td></tr><tr><td colspan="2"><br><h2>Variables</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structtask__t.html">task_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#032a246385c40a7254d11dd557140401">first_task</a> = 0</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight"><p><b>For internal use only.</b></p><p>Pointer to the first task in our linked list </p> <a href="#032a246385c40a7254d11dd557140401"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structtask__t.html">task_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__task.html#g4743b3673a8794b8e7bd0b6c91a63cd5">current_task</a> = 0</td></tr>?? 快捷鍵說明
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