/*\r
- FreeRTOS.org V5.0.2 - Copyright (C) 2003-2008 Richard Barry.\r
+ FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.\r
\r
- This file is part of the FreeRTOS.org distribution.\r
\r
- FreeRTOS.org is free software; you can redistribute it and/or modify\r
- it under the terms of the GNU General Public License as published by\r
- the Free Software Foundation; either version 2 of the License, or\r
- (at your option) any later version.\r
-\r
- FreeRTOS.org is distributed in the hope that it will be useful,\r
- but WITHOUT ANY WARRANTY; without even the implied warranty of\r
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
- GNU General Public License for more details.\r
-\r
- You should have received a copy of the GNU General Public License\r
- along with FreeRTOS.org; if not, write to the Free Software\r
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r
-\r
- A special exception to the GPL can be applied should you wish to distribute\r
- a combined work that includes FreeRTOS.org, without being obliged to provide\r
- the source code for any proprietary components. See the licensing section \r
- of http://www.FreeRTOS.org for full details of how and when the exception\r
- can be applied.\r
-\r
- ***************************************************************************\r
- ***************************************************************************\r
- * *\r
- * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *\r
- * and even write all or part of your application on your behalf. *\r
- * See http://www.OpenRTOS.com for details of the services we provide to *\r
- * expedite your project. *\r
- * *\r
***************************************************************************\r
+ * *\r
+ * FreeRTOS tutorial books are available in pdf and paperback. *\r
+ * Complete, revised, and edited pdf reference manuals are also *\r
+ * available. *\r
+ * *\r
+ * Purchasing FreeRTOS documentation will not only help you, by *\r
+ * ensuring you get running as quickly as possible and with an *\r
+ * in-depth knowledge of how to use FreeRTOS, it will also help *\r
+ * the FreeRTOS project to continue with its mission of providing *\r
+ * professional grade, cross platform, de facto standard solutions *\r
+ * for microcontrollers - completely free of charge! *\r
+ * *\r
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *\r
+ * *\r
+ * Thank you for using FreeRTOS, and thank you for your support! *\r
+ * *\r
***************************************************************************\r
\r
- Please ensure to read the configuration and relevant port sections of the\r
- online documentation.\r
\r
- http://www.FreeRTOS.org - Documentation, latest information, license and \r
- contact details.\r
-\r
- http://www.SafeRTOS.com - A version that is certified for use in safety \r
- critical systems.\r
+ This file is part of the FreeRTOS distribution.\r
+\r
+ FreeRTOS is free software; you can redistribute it and/or modify it under\r
+ the terms of the GNU General Public License (version 2) as published by the\r
+ Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
+ >>>NOTE<<< The modification to the GPL is included to allow you to\r
+ distribute a combined work that includes FreeRTOS without being obliged to\r
+ provide the source code for proprietary components outside of the FreeRTOS\r
+ kernel. FreeRTOS is distributed in the hope that it will be useful, but\r
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\r
+ more details. You should have received a copy of the GNU General Public\r
+ License and the FreeRTOS license exception along with FreeRTOS; if not it\r
+ can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
+ by writing to Richard Barry, contact details for whom are available on the\r
+ FreeRTOS WEB site.\r
+\r
+ 1 tab == 4 spaces!\r
+ \r
+ ***************************************************************************\r
+ * *\r
+ * Having a problem? Start by reading the FAQ "My application does *\r
+ * not run, what could be wrong? *\r
+ * *\r
+ * http://www.FreeRTOS.org/FAQHelp.html *\r
+ * *\r
+ ***************************************************************************\r
\r
- http://www.OpenRTOS.com - Commercial support, development, porting, \r
- licensing and training services.\r
+ \r
+ http://www.FreeRTOS.org - Documentation, training, latest information, \r
+ license and contact details.\r
+ \r
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
+ including FreeRTOS+Trace - an indispensable productivity tool.\r
+\r
+ Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell \r
+ the code with commercial support, indemnification, and middleware, under \r
+ the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also\r
+ provide a safety engineered and independently SIL3 certified version under \r
+ the SafeRTOS brand: http://www.SafeRTOS.com.\r
*/\r
\r
#ifndef SEMAPHORE_H\r
#define SEMAPHORE_H\r
\r
+#ifndef INC_FREERTOS_H\r
+ #error "include FreeRTOS.h" must appear in source files before "include semphr.h"\r
+#endif\r
+\r
#include "queue.h"\r
\r
typedef xQueueHandle xSemaphoreHandle;\r
\r
-#define semBINARY_SEMAPHORE_QUEUE_LENGTH ( ( unsigned portCHAR ) 1 )\r
-#define semSEMAPHORE_QUEUE_ITEM_LENGTH ( ( unsigned portCHAR ) 0 )\r
-#define semGIVE_BLOCK_TIME ( ( portTickType ) 0 )\r
+#define semBINARY_SEMAPHORE_QUEUE_LENGTH ( ( unsigned char ) 1U )\r
+#define semSEMAPHORE_QUEUE_ITEM_LENGTH ( ( unsigned char ) 0U )\r
+#define semGIVE_BLOCK_TIME ( ( portTickType ) 0U )\r
\r
\r
/**\r
* \defgroup vSemaphoreCreateBinary vSemaphoreCreateBinary\r
* \ingroup Semaphores\r
*/\r
-#define vSemaphoreCreateBinary( xSemaphore ) { \\r
- xSemaphore = xQueueCreate( ( unsigned portBASE_TYPE ) 1, semSEMAPHORE_QUEUE_ITEM_LENGTH ); \\r
- if( xSemaphore != NULL ) \\r
- { \\r
- xSemaphoreGive( xSemaphore ); \\r
- } \\r
- }\r
+#define vSemaphoreCreateBinary( xSemaphore ) \\r
+ { \\r
+ ( xSemaphore ) = xQueueGenericCreate( ( unsigned portBASE_TYPE ) 1, semSEMAPHORE_QUEUE_ITEM_LENGTH, queueQUEUE_TYPE_BINARY_SEMAPHORE ); \\r
+ if( ( xSemaphore ) != NULL ) \\r
+ { \\r
+ xSemaphoreGive( ( xSemaphore ) ); \\r
+ } \\r
+ }\r
\r
/**\r
* semphr. h\r
- * xSemaphoreTake( \r
+ * <pre>xSemaphoreTake( \r
* xSemaphoreHandle xSemaphore, \r
* portTickType xBlockTime \r
* )</pre>\r
* \defgroup xSemaphoreTake xSemaphoreTake\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreTake( xSemaphore, xBlockTime ) xQueueGenericReceive( ( xQueueHandle ) xSemaphore, NULL, xBlockTime, pdFALSE )\r
+#define xSemaphoreTake( xSemaphore, xBlockTime ) xQueueGenericReceive( ( xQueueHandle ) ( xSemaphore ), NULL, ( xBlockTime ), pdFALSE )\r
\r
/**\r
* semphr. h\r
* \defgroup xSemaphoreTakeRecursive xSemaphoreTakeRecursive\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreTakeRecursive( xMutex, xBlockTime ) xQueueTakeMutexRecursive( xMutex, xBlockTime )\r
+#define xSemaphoreTakeRecursive( xMutex, xBlockTime ) xQueueTakeMutexRecursive( ( xMutex ), ( xBlockTime ) )\r
\r
\r
/* \r
* responsiveness to gain execution speed, whereas the fully featured API\r
* sacrifices execution speed to ensure better interrupt responsiveness.\r
*/\r
-#define xSemaphoreAltTake( xSemaphore, xBlockTime ) xQueueAltGenericReceive( ( xQueueHandle ) xSemaphore, NULL, xBlockTime, pdFALSE )\r
+#define xSemaphoreAltTake( xSemaphore, xBlockTime ) xQueueAltGenericReceive( ( xQueueHandle ) ( xSemaphore ), NULL, ( xBlockTime ), pdFALSE )\r
\r
/**\r
* semphr. h\r
* \defgroup xSemaphoreGive xSemaphoreGive\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreGive( xSemaphore ) xQueueGenericSend( ( xQueueHandle ) xSemaphore, NULL, semGIVE_BLOCK_TIME, queueSEND_TO_BACK )\r
+#define xSemaphoreGive( xSemaphore ) xQueueGenericSend( ( xQueueHandle ) ( xSemaphore ), NULL, semGIVE_BLOCK_TIME, queueSEND_TO_BACK )\r
\r
/**\r
* semphr. h\r
* \defgroup xSemaphoreGiveRecursive xSemaphoreGiveRecursive\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreGiveRecursive( xMutex ) xQueueGiveMutexRecursive( xMutex )\r
+#define xSemaphoreGiveRecursive( xMutex ) xQueueGiveMutexRecursive( ( xMutex ) )\r
\r
/* \r
* xSemaphoreAltGive() is an alternative version of xSemaphoreGive().\r
* responsiveness to gain execution speed, whereas the fully featured API\r
* sacrifices execution speed to ensure better interrupt responsiveness.\r
*/\r
-#define xSemaphoreAltGive( xSemaphore ) xQueueAltGenericSend( ( xQueueHandle ) xSemaphore, NULL, semGIVE_BLOCK_TIME, queueSEND_TO_BACK )\r
+#define xSemaphoreAltGive( xSemaphore ) xQueueAltGenericSend( ( xQueueHandle ) ( xSemaphore ), NULL, semGIVE_BLOCK_TIME, queueSEND_TO_BACK )\r
\r
/**\r
* semphr. h\r
* <pre>\r
xSemaphoreGiveFromISR( \r
xSemaphoreHandle xSemaphore, \r
- portBASE_TYPE *pxHigherPriorityTaskWoken\r
+ signed portBASE_TYPE *pxHigherPriorityTaskWoken\r
)</pre>\r
*\r
* <i>Macro</i> to release a semaphore. The semaphore must have previously been\r
*\r
* Example usage:\r
<pre>\r
- #define LONG_TIME 0xffff\r
- #define TICKS_TO_WAIT 10\r
+ \#define LONG_TIME 0xffff\r
+ \#define TICKS_TO_WAIT 10\r
xSemaphoreHandle xSemaphore = NULL;\r
\r
// Repetitive task.\r
// Timer ISR\r
void vTimerISR( void * pvParameters )\r
{\r
- static unsigned portCHAR ucLocalTickCount = 0;\r
- static portBASE_TYPE xHigherPriorityTaskWoken;\r
+ static unsigned char ucLocalTickCount = 0;\r
+ static signed portBASE_TYPE xHigherPriorityTaskWoken;\r
\r
// A timer tick has occurred.\r
\r
* \defgroup xSemaphoreGiveFromISR xSemaphoreGiveFromISR\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreGiveFromISR( xSemaphore, pxHigherPriorityTaskWoken ) xQueueGenericSendFromISR( ( xQueueHandle ) xSemaphore, NULL, pxHigherPriorityTaskWoken, queueSEND_TO_BACK )\r
+#define xSemaphoreGiveFromISR( xSemaphore, pxHigherPriorityTaskWoken ) xQueueGenericSendFromISR( ( xQueueHandle ) ( xSemaphore ), NULL, ( pxHigherPriorityTaskWoken ), queueSEND_TO_BACK )\r
+\r
+/**\r
+ * semphr. h\r
+ * <pre>\r
+ xSemaphoreTakeFromISR( \r
+ xSemaphoreHandle xSemaphore, \r
+ signed portBASE_TYPE *pxHigherPriorityTaskWoken\r
+ )</pre>\r
+ *\r
+ * <i>Macro</i> to take a semaphore from an ISR. The semaphore must have \r
+ * previously been created with a call to vSemaphoreCreateBinary() or \r
+ * xSemaphoreCreateCounting().\r
+ *\r
+ * Mutex type semaphores (those created using a call to xSemaphoreCreateMutex())\r
+ * must not be used with this macro.\r
+ *\r
+ * This macro can be used from an ISR, however taking a semaphore from an ISR\r
+ * is not a common operation. It is likely to only be useful when taking a\r
+ * counting semaphore when an interrupt is obtaining an object from a resource\r
+ * pool (when the semaphore count indicates the number of resources available).\r
+ *\r
+ * @param xSemaphore A handle to the semaphore being taken. This is the\r
+ * handle returned when the semaphore was created.\r
+ *\r
+ * @param pxHigherPriorityTaskWoken xSemaphoreTakeFromISR() will set\r
+ * *pxHigherPriorityTaskWoken to pdTRUE if taking the semaphore caused a task\r
+ * to unblock, and the unblocked task has a priority higher than the currently\r
+ * running task. If xSemaphoreTakeFromISR() sets this value to pdTRUE then\r
+ * a context switch should be requested before the interrupt is exited.\r
+ *\r
+ * @return pdTRUE if the semaphore was successfully taken, otherwise \r
+ * pdFALSE\r
+ */\r
+#define xSemaphoreTakeFromISR( xSemaphore, pxHigherPriorityTaskWoken ) xQueueReceiveFromISR( ( xQueueHandle ) ( xSemaphore ), NULL, ( pxHigherPriorityTaskWoken ) )\r
\r
/**\r
* semphr. h\r
* \defgroup vSemaphoreCreateMutex vSemaphoreCreateMutex\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreCreateMutex() xQueueCreateMutex()\r
+#define xSemaphoreCreateMutex() xQueueCreateMutex( queueQUEUE_TYPE_MUTEX )\r
\r
\r
/**\r
* \defgroup vSemaphoreCreateMutex vSemaphoreCreateMutex\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreCreateRecursiveMutex() xQueueCreateMutex()\r
+#define xSemaphoreCreateRecursiveMutex() xQueueCreateMutex( queueQUEUE_TYPE_RECURSIVE_MUTEX )\r
\r
/**\r
* semphr. h\r
* \defgroup xSemaphoreCreateCounting xSemaphoreCreateCounting\r
* \ingroup Semaphores\r
*/\r
-#define xSemaphoreCreateCounting( uxMaxCount, uxInitialCount ) xQueueCreateCountingSemaphore( uxMaxCount, uxInitialCount )\r
+#define xSemaphoreCreateCounting( uxMaxCount, uxInitialCount ) xQueueCreateCountingSemaphore( ( uxMaxCount ), ( uxInitialCount ) )\r
+\r
+/**\r
+ * semphr. h\r
+ * <pre>void vSemaphoreDelete( xSemaphoreHandle xSemaphore );</pre>\r
+ *\r
+ * Delete a semaphore. This function must be used with care. For example,\r
+ * do not delete a mutex type semaphore if the mutex is held by a task.\r
+ *\r
+ * @param xSemaphore A handle to the semaphore to be deleted.\r
+ *\r
+ * \page vSemaphoreDelete vSemaphoreDelete\r
+ * \ingroup Semaphores\r
+ */\r
+#define vSemaphoreDelete( xSemaphore ) vQueueDelete( ( xQueueHandle ) ( xSemaphore ) )\r
\r
+/**\r
+ * semphr.h\r
+ * <pre>xTaskHandle xSemaphoreGetMutexHolder( xSemaphoreHandle xMutex );</pre>\r
+ *\r
+ * If xMutex is indeed a mutex type semaphore, return the current mutex holder.\r
+ * If xMutex is not a mutex type semaphore, or the mutex is available (not held\r
+ * by a task), return NULL.\r
+ *\r
+ * Note: This Is is a good way of determining if the calling task is the mutex \r
+ * holder, but not a good way of determining the identity of the mutex holder as\r
+ * the holder may change between the function exiting and the returned value\r
+ * being tested.\r
+ */\r
+#define xSemaphoreGetMutexHolder( xSemaphore ) xQueueGetMutexHolder( ( xSemaphore ) )\r
\r
#endif /* SEMAPHORE_H */\r
\r
projects / freertos / blobdiff