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Core kernel code:

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+ Introduce xSemaphoreGenericGiveFromISR() as an optimisation when giving semaphores and mutexes from an interrupt.

Demo applications:
+ Update IntSemTest.c to provide more code coverage in xSemaphoreGenericGiveFromISR().
+ Ensure the MMU is turned on in the RZ IAR demo.  It was already on in the RZ ARM demo.
This commit is contained in:
Richard Barry 2014-09-16 14:54:32 +00:00
parent b3c040fc27
commit 3b0854bf96
9 changed files with 509 additions and 179 deletions
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10
FreeRTOS/Demo/CORTEX_A9_RZ_R7S72100_IAR_DS-5/IAR/settings/RTOSDemo.dbgdt
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@ -39,7 +39,7 @@
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@ -55,7 +55,7 @@
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@ -67,20 +67,20 @@
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5
FreeRTOS/Demo/CORTEX_A9_RZ_R7S72100_IAR_DS-5/IAR/settings/RTOSDemo.dni
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@ -14,7 +14,7 @@ Watch0=_ 0 "" 0 "" 0 "" 0 "" 0 0 0 0
Watch1=_ 0 "" 0 "" 0 "" 0 "" 0 0 0 0
CStepIntDis=_ 0
[DebugChecksum]
Checksum=-1045357403
Checksum=72368941
[Jet]
JetConnSerialNo=73866
JetConnFoundProbes=
@ -109,7 +109,8 @@ Exclusions=
[Disassemble mode]
mode=0
[Breakpoints2]
Count=0
Bp0=_ 1 "EMUL_CODE" "{$PROJ_DIR$\..\Source\main.c}.136.2" 0 0 1 "" 0 "" 0
Count=1
[Aliases]
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SuppressDialog=0

8
FreeRTOS/Demo/CORTEX_A9_RZ_R7S72100_IAR_DS-5/IAR/settings/RTOSDemo.wsdt
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@ -38,7 +38,7 @@
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<NodeDict><ExpandedNode>RTOSDemo</ExpandedNode></NodeDict></Session>
</Tab>
</Tabs>
@ -58,20 +58,20 @@
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<Tab><Identity>TabID-959-438</Identity><TabName>Ambiguous Definitions</TabName><Factory>Select-Ambiguous-Definitions</Factory><Session/></Tab><Tab><Identity>TabID-21579-10611</Identity><TabName>Find All Declarations</TabName><Factory>Find-All-Declarations</Factory><Session/></Tab></Tabs>
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BIN
FreeRTOS/Demo/CORTEX_M4_ATSAM4S_Atmel_Studio/RTOSDemo.atsuo
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Binary file not shown.

468
FreeRTOS/Demo/Common/Minimal/IntSemTest.c
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@ -91,6 +91,10 @@
/* A block time of 0 means 'don't block'. */
#define intsemNO_BLOCK 0
/* The maximum count value for the counting semaphore given from an
interrupt. */
#define intsemMAX_COUNT 3
/*-----------------------------------------------------------*/
/*
@ -106,6 +110,26 @@
static void vInterruptMutexSlaveTask( void *pvParameters );
static void vInterruptMutexMasterTask( void *pvParameters );
/*
* A test whereby the master takes the shared and interrupt mutexes in that
* order, then gives them back in the same order, ensuring the priority
* inheritance is behaving as expected at each step.
*/
static void prvTakeAndGiveInTheSameOrder( void );
/*
* A test whereby the master takes the shared and interrupt mutexes in that
* order, then gives them back in the opposite order to which they were taken,
* ensuring the priority inheritance is behaving as expected at each step.
*/
static void prvTakeAndGiveInTheOppositeOrder( void );
/*
* A simple task that interacts with an interrupt using a counting semaphore,
* primarily for code coverage purposes.
*/
static void vInterruptCountingSemaphoreTask( void *pvParameters );
/*-----------------------------------------------------------*/
/* Flag that will be latched to pdTRUE should any unexpected behaviour be
@ -114,7 +138,7 @@ static volatile BaseType_t xErrorDetected = pdFALSE;
/* Counters that are incremented on each cycle of a test. This is used to
detect a stalled task - a test that is no longer running. */
static volatile uint32_t ulMasterLoops = 0;
static volatile uint32_t ulMasterLoops = 0, ulCountingSemaphoreLoops = 0;
/* Handles of the test tasks that must be accessed from other test tasks. */
static TaskHandle_t xSlaveHandle;
@ -124,6 +148,9 @@ not be used given in interrupts (and definitely never taken in an interrupt)
there are some circumstances when it may be desirable. */
static SemaphoreHandle_t xISRMutex = NULL;
/* A counting semaphore which is given from an interrupt. */
static SemaphoreHandle_t xISRCountingSemaphore = NULL;
/* A mutex which is shared between the master and slave tasks - the master
does both sharing of this mutex with the slave and receiving a mutex from the
interrupt. */
@ -132,15 +159,20 @@ static SemaphoreHandle_t xMasterSlaveMutex = NULL;
/* Flag that allows the master task to control when the interrupt gives or does
not give the mutex. There is no mutual exclusion on this variable, but this is
only test code and it should be fine in the 32=bit test environment. */
static BaseType_t xOkToGiveMutex = pdFALSE;
static BaseType_t xOkToGiveMutex = pdFALSE, xOkToGiveCountingSemaphore = pdFALSE;
/* Used to coordinate timing between tasks and the interrupt. */
const TickType_t xInterruptGivePeriod = pdMS_TO_TICKS( intsemINTERRUPT_MUTEX_GIVE_PERIOD_MS );
/*-----------------------------------------------------------*/
void vStartInterruptSemaphoreTasks( void )
{
/* Create the mutex that is given from an interrupt. */
/* Create the semaphores that are given from an interrupt. */
xISRMutex = xSemaphoreCreateMutex();
configASSERT( xISRMutex );
xISRCountingSemaphore = xSemaphoreCreateCounting( intsemMAX_COUNT, 0 );
configASSERT( xISRCountingSemaphore );
/* Create the mutex that is shared between the master and slave tasks (the
master receives a mutex from an interrupt and shares a mutex with the
@ -151,163 +183,26 @@ void vStartInterruptSemaphoreTasks( void )
/* Create the tasks that share mutexes between then and with interrupts. */
xTaskCreate( vInterruptMutexSlaveTask, "IntMuS", configMINIMAL_STACK_SIZE, NULL, intsemSLAVE_PRIORITY, &xSlaveHandle );
xTaskCreate( vInterruptMutexMasterTask, "IntMuM", configMINIMAL_STACK_SIZE, NULL, intsemMASTER_PRIORITY, NULL );
/* Create the task that blocks on the counting semaphore. */
xTaskCreate( vInterruptCountingSemaphoreTask, "IntCnt", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
}
/*-----------------------------------------------------------*/
static void vInterruptMutexMasterTask( void *pvParameters )
{
const TickType_t xInterruptGivePeriod = pdMS_TO_TICKS( intsemINTERRUPT_MUTEX_GIVE_PERIOD_MS );
/* Just to avoid compiler warnings. */
( void ) pvParameters;
for( ;; )
{
/* Ensure the slave is suspended, and that this task is running at the
lower priority as expected as the start conditions. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eSuspended );
}
#endif /* INCLUDE_eTaskGetState */
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Take the semaphore that is shared with the slave. */
if( xSemaphoreTake( xMasterSlaveMutex, intsemNO_BLOCK ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
/* This task now has the mutex. Unsuspend the slave so it too
attempts to take the mutex. */
vTaskResume( xSlaveHandle );
/* The slave has the higher priority so should now have executed and
blocked on the semaphore. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eBlocked );
}
#endif /* INCLUDE_eTaskGetState */
/* This task should now have inherited the priority of the slave
task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Now wait a little longer than the time between ISR gives to also
obtain the ISR mutex. */
xOkToGiveMutex = pdTRUE;
if( xSemaphoreTake( xISRMutex, ( xInterruptGivePeriod * 2 ) ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
xOkToGiveMutex = pdFALSE;
/* Attempting to take again immediately should fail as the mutex is
already held. */
if( xSemaphoreTake( xISRMutex, intsemNO_BLOCK ) != pdFAIL )
{
xErrorDetected = pdTRUE;
}
/* Should still be at the priority of the slave task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Give back the ISR semaphore to ensure the priority is not
disinherited as the shared mutex (which the higher priority task is
attempting to obtain) is still held. */
if( xSemaphoreGive( xISRMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Finally give back the shared mutex. This time the higher priority
task should run before this task runs again - so this task should have
disinherited the priority and the higher priority task should be in the
suspended state again. */
if( xSemaphoreGive( xMasterSlaveMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eSuspended );
}
#endif /* INCLUDE_eTaskGetState */
prvTakeAndGiveInTheSameOrder();
/* Ensure not to starve out other tests. */
ulMasterLoops++;
vTaskDelay( intsemINTERRUPT_MUTEX_GIVE_PERIOD_MS );
/* Repeat exactly up to the point where the mutexes are given back.
This time the shared mutex is given back first. */
if( xSemaphoreTake( xMasterSlaveMutex, intsemNO_BLOCK ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
vTaskResume( xSlaveHandle );
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eBlocked );
}
#endif /* INCLUDE_eTaskGetState */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
xOkToGiveMutex = pdTRUE;
if( xSemaphoreTake( xISRMutex, ( xInterruptGivePeriod * 2 ) ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
xOkToGiveMutex = pdFALSE;
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* This is where the differences start as this time the shared mutex is
given back first. This time to the higher priority task should run
before this task gets to the point of releasing the interrupt mutex - so
this task should have disinherited the priority and the higher priority
task should be in the suspended state again. */
if( xSemaphoreGive( xMasterSlaveMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
/* Give back the interrupt semaphore too, so the mutex held count goes
back to 0. The mutex will then have to be reset so the ISR can give it
in the next cycle. */
xSemaphoreGive( xISRMutex );
xQueueReset( ( QueueHandle_t ) xISRMutex );
prvTakeAndGiveInTheOppositeOrder();
/* Ensure not to starve out other tests. */
ulMasterLoops++;
@ -316,6 +211,201 @@ const TickType_t xInterruptGivePeriod = pdMS_TO_TICKS( intsemINTERRUPT_MUTEX_GIV
}
/*-----------------------------------------------------------*/
static void prvTakeAndGiveInTheSameOrder( void )
{
/* Ensure the slave is suspended, and that this task is running at the
lower priority as expected as the start conditions. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eSuspended );
}
#endif /* INCLUDE_eTaskGetState */
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Take the semaphore that is shared with the slave. */
if( xSemaphoreTake( xMasterSlaveMutex, intsemNO_BLOCK ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
/* This task now has the mutex. Unsuspend the slave so it too
attempts to take the mutex. */
vTaskResume( xSlaveHandle );
/* The slave has the higher priority so should now have executed and
blocked on the semaphore. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eBlocked );
}
#endif /* INCLUDE_eTaskGetState */
/* This task should now have inherited the priority of the slave
task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Now wait a little longer than the time between ISR gives to also
obtain the ISR mutex. */
xOkToGiveMutex = pdTRUE;
if( xSemaphoreTake( xISRMutex, ( xInterruptGivePeriod * 2 ) ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
xOkToGiveMutex = pdFALSE;
/* Attempting to take again immediately should fail as the mutex is
already held. */
if( xSemaphoreTake( xISRMutex, intsemNO_BLOCK ) != pdFAIL )
{
xErrorDetected = pdTRUE;
}
/* Should still be at the priority of the slave task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Give back the ISR semaphore to ensure the priority is not
disinherited as the shared mutex (which the higher priority task is
attempting to obtain) is still held. */
if( xSemaphoreGive( xISRMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Finally give back the shared mutex. This time the higher priority
task should run before this task runs again - so this task should have
disinherited the priority and the higher priority task should be in the
suspended state again. */
if( xSemaphoreGive( xMasterSlaveMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eSuspended );
}
#endif /* INCLUDE_eTaskGetState */
/* Reset the mutex ready for the next round. */
xQueueReset( xISRMutex );
}
/*-----------------------------------------------------------*/
static void prvTakeAndGiveInTheOppositeOrder( void )
{
/* Ensure the slave is suspended, and that this task is running at the
lower priority as expected as the start conditions. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eSuspended );
}
#endif /* INCLUDE_eTaskGetState */
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Take the semaphore that is shared with the slave. */
if( xSemaphoreTake( xMasterSlaveMutex, intsemNO_BLOCK ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
/* This task now has the mutex. Unsuspend the slave so it too
attempts to take the mutex. */
vTaskResume( xSlaveHandle );
/* The slave has the higher priority so should now have executed and
blocked on the semaphore. */
#if( INCLUDE_eTaskGetState == 1 )
{
configASSERT( eTaskGetState( xSlaveHandle ) == eBlocked );
}
#endif /* INCLUDE_eTaskGetState */
/* This task should now have inherited the priority of the slave
task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Now wait a little longer than the time between ISR gives to also
obtain the ISR mutex. */
xOkToGiveMutex = pdTRUE;
if( xSemaphoreTake( xISRMutex, ( xInterruptGivePeriod * 2 ) ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
xOkToGiveMutex = pdFALSE;
/* Attempting to take again immediately should fail as the mutex is
already held. */
if( xSemaphoreTake( xISRMutex, intsemNO_BLOCK ) != pdFAIL )
{
xErrorDetected = pdTRUE;
}
/* Should still be at the priority of the slave task. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Give back the shared semaphore to ensure the priority is not disinherited
as the ISR mutex is still held. The higher priority slave task should run
before this task runs again. */
if( xSemaphoreGive( xMasterSlaveMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
/* Should still be at the priority of the slave task as this task still
holds one semaphore (this is a simplification in the priority inheritance
mechanism. */
if( uxTaskPriorityGet( NULL ) != intsemSLAVE_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Give back the ISR semaphore, which should result in the priority being
disinherited as it was the last mutex held. */
if( xSemaphoreGive( xISRMutex ) != pdPASS )
{
xErrorDetected = pdTRUE;
}
if( uxTaskPriorityGet( NULL ) != intsemMASTER_PRIORITY )
{
xErrorDetected = pdTRUE;
}
/* Reset the mutex ready for the next round. */
xQueueReset( xISRMutex );
}
/*-----------------------------------------------------------*/
static void vInterruptMutexSlaveTask( void *pvParameters )
{
/* Just to avoid compiler warnings. */
@ -343,9 +433,76 @@ static void vInterruptMutexSlaveTask( void *pvParameters )
}
/*-----------------------------------------------------------*/
static void vInterruptCountingSemaphoreTask( void *pvParameters )
{
BaseType_t xCount;
const TickType_t xDelay = pdMS_TO_TICKS( intsemINTERRUPT_MUTEX_GIVE_PERIOD_MS ) * ( intsemMAX_COUNT + 1 );
( void ) pvParameters;
for( ;; )
{
/* Expect to start with the counting semaphore empty. */
if( uxQueueMessagesWaiting( ( QueueHandle_t ) xISRCountingSemaphore ) != 0 )
{
xErrorDetected = pdTRUE;
}
/* Wait until it is expected that the interrupt will have filled the
counting semaphore. */
xOkToGiveCountingSemaphore = pdTRUE;
vTaskDelay( xDelay );
xOkToGiveCountingSemaphore = pdFALSE;
/* Now it is expected that the counting semaphore is full. */
if( uxQueueMessagesWaiting( ( QueueHandle_t ) xISRCountingSemaphore ) != intsemMAX_COUNT )
{
xErrorDetected = pdTRUE;
}
if( uxQueueSpacesAvailable( ( QueueHandle_t ) xISRCountingSemaphore ) != 0 )
{
xErrorDetected = pdTRUE;
}
ulCountingSemaphoreLoops++;
/* Expect to be able to take the counting semaphore intsemMAX_COUNT
times. A block time of 0 is used as the semaphore should already be
there. */
xCount = 0;
while( xSemaphoreTake( xISRCountingSemaphore, 0 ) == pdPASS )
{
xCount++;
}
if( xCount != intsemMAX_COUNT )
{
xErrorDetected = pdTRUE;
}
/* Now raise the priority of this task so it runs immediately that the
semaphore is given from the interrupt. */
vTaskPrioritySet( NULL, configMAX_PRIORITIES - 1 );
/* Block to wait for the semaphore to be given from the interrupt. */
xOkToGiveCountingSemaphore = pdTRUE;
xSemaphoreTake( xISRCountingSemaphore, portMAX_DELAY );
xSemaphoreTake( xISRCountingSemaphore, portMAX_DELAY );
xOkToGiveCountingSemaphore = pdFALSE;
/* Reset the priority so as not to disturbe other tests too much. */
vTaskPrioritySet( NULL, tskIDLE_PRIORITY );
ulCountingSemaphoreLoops++;
}
}
/*-----------------------------------------------------------*/
void vInterruptSemaphorePeriodicTest( void )
{
static TickType_t xLastGiveTime = 0;
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
TickType_t xTimeNow;
/* No mutual exclusion on xOkToGiveMutex, but this is only test code (and
@ -356,20 +513,30 @@ TickType_t xTimeNow;
configASSERT( xISRMutex );
if( xOkToGiveMutex != pdFALSE )
{
/* Null is used as the second parameter in this give, and non-NULL
in the other gives for code coverage reasons. */
xSemaphoreGiveFromISR( xISRMutex, NULL );
/* Second give attempt should fail. */
configASSERT( xSemaphoreGiveFromISR( xISRMutex, NULL ) == pdFAIL );
configASSERT( xSemaphoreGiveFromISR( xISRMutex, &xHigherPriorityTaskWoken ) == pdFAIL );
}
if( xOkToGiveCountingSemaphore != pdFALSE )
{
xSemaphoreGiveFromISR( xISRCountingSemaphore, &xHigherPriorityTaskWoken );
}
xLastGiveTime = xTimeNow;
}
/* Remove compiler warnings about the value being set but not used. */
( void ) xHigherPriorityTaskWoken;
}
/*-----------------------------------------------------------*/
/* This is called to check that all the created tasks are still running. */
BaseType_t xAreInterruptSemaphoreTasksStillRunning( void )
{
static uint32_t ulLastMasterLoopCounter = 0;
static uint32_t ulLastMasterLoopCounter = 0, ulLastCountingSemaphoreLoops = 0;
/* If the demo tasks are running then it is expected that the loop counters
will have changed since this function was last called. */
@ -380,6 +547,13 @@ static uint32_t ulLastMasterLoopCounter = 0;
ulLastMasterLoopCounter = ulMasterLoops;
if( ulLastCountingSemaphoreLoops == ulCountingSemaphoreLoops )
{
xErrorDetected = pdTRUE;
}
ulLastCountingSemaphoreLoops = ulCountingSemaphoreLoops++;
/* Errors detected in the task itself will have latched xErrorDetected
to true. */

4
FreeRTOS/Source/include/queue.h
View File

@ -1269,7 +1269,8 @@ uint32_t ulVarToSend, ulValReceived;
*
* It is preferred that the macros xQueueSendFromISR(),
* xQueueSendToFrontFromISR() and xQueueSendToBackFromISR() be used in place
* of calling this function directly.
* of calling this function directly. xQueueGenericGiveFromISR() is an
* equivalent for use by semaphores that don't actually copy any data.
*
* Post an item on a queue. It is safe to use this function from within an
* interrupt service routine.
@ -1333,6 +1334,7 @@ uint32_t ulVarToSend, ulValReceived;
* \ingroup QueueManagement
*/
BaseType_t xQueueGenericSendFromISR( QueueHandle_t xQueue, const void * const pvItemToQueue, BaseType_t * const pxHigherPriorityTaskWoken, const BaseType_t xCopyPosition ) PRIVILEGED_FUNCTION;
BaseType_t xQueueGenericGiveFromISR( QueueHandle_t xQueue, BaseType_t * const pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
/**
* queue. h

2
FreeRTOS/Source/include/semphr.h
View File

@ -605,7 +605,7 @@ typedef QueueHandle_t SemaphoreHandle_t;
* \defgroup xSemaphoreGiveFromISR xSemaphoreGiveFromISR
* \ingroup Semaphores
*/
#define xSemaphoreGiveFromISR( xSemaphore, pxHigherPriorityTaskWoken ) xQueueGenericSendFromISR( ( QueueHandle_t ) ( xSemaphore ), NULL, ( pxHigherPriorityTaskWoken ), queueSEND_TO_BACK )
#define xSemaphoreGiveFromISR( xSemaphore, pxHigherPriorityTaskWoken ) xQueueGenericGiveFromISR( ( QueueHandle_t ) ( xSemaphore ), ( pxHigherPriorityTaskWoken ) )
/**
* semphr. h

174
FreeRTOS/Source/queue.c
View File

@ -1074,20 +1074,12 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
{
traceQUEUE_SEND_FROM_ISR( pxQueue );
if( prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition ) != pdFALSE )
{
/* This is a special case that can only be executed if a task
holds multiple mutexes and then gives the mutexes back in an
order that is different to that in which they were taken. */
if( pxHigherPriorityTaskWoken != NULL )
{
*pxHigherPriorityTaskWoken = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
/* A task can only have an inherited priority if it is a mutex
holder - and if there is a mutex holder then the mutex cannot be
given from an ISR. Therefore, unlike the xQueueGenericGive()
function, there is no need to determine the need for priority
disinheritance here or to clear the mutex holder TCB member. */
( void ) prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );
/* The event list is not altered if the queue is locked. This will
be done when the queue is unlocked later. */
@ -1194,6 +1186,160 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
}
/*-----------------------------------------------------------*/
BaseType_t xQueueGenericGiveFromISR( QueueHandle_t xQueue, BaseType_t * const pxHigherPriorityTaskWoken )
{
BaseType_t xReturn;
UBaseType_t uxSavedInterruptStatus;
Queue_t * const pxQueue = ( Queue_t * ) xQueue;
configASSERT( pxQueue );
/* xQueueGenericSendFromISR() should be used in the item size is not 0. */
configASSERT( pxQueue->uxItemSize == 0 );
/* RTOS ports that support interrupt nesting have the concept of a maximum
system call (or maximum API call) interrupt priority. Interrupts that are
above the maximum system call priority are kept permanently enabled, even
when the RTOS kernel is in a critical section, but cannot make any calls to
FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
failure if a FreeRTOS API function is called from an interrupt that has been
assigned a priority above the configured maximum system call priority.
Only FreeRTOS functions that end in FromISR can be called from interrupts
that have been assigned a priority at or (logically) below the maximum
system call interrupt priority. FreeRTOS maintains a separate interrupt
safe API to ensure interrupt entry is as fast and as simple as possible.
More information (albeit Cortex-M specific) is provided on the following
link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */
portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
/* Similar to xQueueGenericSendFromISR() but used with semaphores where the
item size is 0. Don't directly wake a task that was blocked on a queue
read, instead return a flag to say whether a context switch is required or
not (i.e. has a task with a higher priority than us been woken by this
post). */
uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
{
/* When the queue is used to implement a semaphore no data is ever
moved through the queue but it is still valid to see if the queue 'has
space'. */
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
{
traceQUEUE_SEND_FROM_ISR( pxQueue );
/* A task can only have an inherited priority if it is a mutex
holder - and if there is a mutex holder then the mutex cannot be
given from an ISR. Therefore, unlike the xQueueGenericGive()
function, there is no need to determine the need for priority
disinheritance here or to clear the mutex holder TCB member. */
++( pxQueue->uxMessagesWaiting );
/* The event list is not altered if the queue is locked. This will
be done when the queue is unlocked later. */
if( pxQueue->xTxLock == queueUNLOCKED )
{
#if ( configUSE_QUEUE_SETS == 1 )
{
if( pxQueue->pxQueueSetContainer != NULL )
{
if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) == pdTRUE )
{
/* The semaphore is a member of a queue set, and
posting to the queue set caused a higher priority
task to unblock. A context switch is required. */
if( pxHigherPriorityTaskWoken != NULL )
{
*pxHigherPriorityTaskWoken = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
{
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
{
/* The task waiting has a higher priority so
record that a context switch is required. */
if( pxHigherPriorityTaskWoken != NULL )
{
*pxHigherPriorityTaskWoken = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
}
#else /* configUSE_QUEUE_SETS */
{
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
{
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
{
/* The task waiting has a higher priority so record that a
context switch is required. */
if( pxHigherPriorityTaskWoken != NULL )
{
*pxHigherPriorityTaskWoken = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
#endif /* configUSE_QUEUE_SETS */
}
else
{
/* Increment the lock count so the task that unlocks the queue
knows that data was posted while it was locked. */
++( pxQueue->xTxLock );
}
xReturn = pdPASS;
}
else
{
traceQUEUE_SEND_FROM_ISR_FAILED( pxQueue );
xReturn = errQUEUE_FULL;
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus ); //0.36
return xReturn;
}
/*-----------------------------------------------------------*/
BaseType_t xQueueGenericReceive( QueueHandle_t xQueue, void * const pvBuffer, TickType_t xTicksToWait, const BaseType_t xJustPeeking )
{
BaseType_t xEntryTimeSet = pdFALSE;

17
FreeRTOS/Source/tasks.c
View File

@ -3254,8 +3254,11 @@ TCB_t *pxTCB;
/* Only disinherit if no other mutexes are held. */
if( pxTCB->uxMutexesHeld == ( UBaseType_t ) 0 )
{
/* The holding task must be the running task to be able to give
the mutex back. Remove the holding task from the ready list. */
/* A task can only have an inhertied priority if it holds
the mutex. If the mutex is held by a task then it cannot be
given from an interrupt, and if a mutex is given by the
holding task then it must be the running state task. Remove
the holding task from the ready list. */
if( uxListRemove( &( pxTCB->xGenericListItem ) ) == ( UBaseType_t ) 0 )
{
taskRESET_READY_PRIORITY( pxTCB->uxPriority );
@ -3265,8 +3268,8 @@ TCB_t *pxTCB;
mtCOVERAGE_TEST_MARKER();
}
/* Disinherit the priority before adding the task into the new
ready list. */
/* Disinherit the priority before adding the task into the
new ready list. */
traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
pxTCB->uxPriority = pxTCB->uxBasePriority;
@ -3279,7 +3282,11 @@ TCB_t *pxTCB;
/* Return true to indicate that a context switch is required.
This is only actually required in the corner case whereby
multiple mutexes were held and the mutexes were given back
in an order different to that in which they were taken. */
in an order different to that in which they were taken.
If a context switch did not occur when the first mutex was
returned, even if a task was waiting on it, then a context
switch should occur when the last mutex is returned whether
a task is waiting on it or not. */
xReturn = pdTRUE;
}
else