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/*
    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
 
    ***************************************************************************
    *                                                                         *
    * If you are:                                                             *
    *                                                                         *
    *    + New to FreeRTOS,                                                   *
    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
    *    + Looking for basic training,                                        *
    *    + Wanting to improve your FreeRTOS skills and productivity           *
    *                                                                         *
    * then take a look at the FreeRTOS books - available as PDF or paperback  *
    *                                                                         *
    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
    *                  http://www.FreeRTOS.org/Documentation                  *
    *                                                                         *
    * A pdf reference manual is also available.  Both are usually delivered   *
    * to your inbox within 20 minutes to two hours when purchased between 8am *
    * and 8pm GMT (although please allow up to 24 hours in case of            *
    * exceptional circumstances).  Thank you for your support!                *
    *                                                                         *
    ***************************************************************************
 
    This file is part of the FreeRTOS distribution.
 
    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
    ***NOTE*** The exception to the GPL is included to allow you to distribute
    a combined work that includes FreeRTOS without being obliged to provide the
    source code for proprietary components outside of the FreeRTOS kernel.
    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
    more details. You should have received a copy of the GNU General Public
    License and the FreeRTOS license exception along with FreeRTOS; if not it
    can be viewed here: http://www.freertos.org/a00114.html and also obtained
    by writing to Richard Barry, contact details for whom are available on the
    FreeRTOS WEB site.
 
    1 tab == 4 spaces!
 
    http://www.FreeRTOS.org - Documentation, latest information, license and
    contact details.
 
    http://www.SafeRTOS.com - A version that is certified for use in safety
    critical systems.
 
    http://www.OpenRTOS.com - Commercial support, development, porting,
    licensing and training services.
*/
 
 
/*
 * Tests the behaviour when data is peeked from a queue when there are
 * multiple tasks blocked on the queue.
 */
 
 
#include <stdlib.h>
 
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
 
/* Demo program include files. */
#include "QPeek.h"
 
#define qpeekQUEUE_LENGTH               ( 5 )
#define qpeekNO_BLOCK                   ( 0 )
#define qpeekSHORT_DELAY                ( 10 )
 
#define qpeekLOW_PRIORITY                       ( tskIDLE_PRIORITY + 0 )
#define qpeekMEDIUM_PRIORITY            ( tskIDLE_PRIORITY + 1 )
#define qpeekHIGH_PRIORITY                      ( tskIDLE_PRIORITY + 2 )
#define qpeekHIGHEST_PRIORITY           ( tskIDLE_PRIORITY + 3 )
 
/*-----------------------------------------------------------*/
 
/*
 * The following three tasks are used to demonstrate the peeking behaviour.
 * Each task is given a different priority to demonstrate the order in which
 * tasks are woken as data is peeked from a queue.
 */
static void prvLowPriorityPeekTask( void *pvParameters );
static void prvMediumPriorityPeekTask( void *pvParameters );
static void prvHighPriorityPeekTask( void *pvParameters );
static void prvHighestPriorityPeekTask( void *pvParameters );
 
/*-----------------------------------------------------------*/
 
/* Flag that will be latched to pdTRUE should any unexpected behaviour be
detected in any of the tasks. */
static volatile portBASE_TYPE xErrorDetected = pdFALSE;
 
/* Counter that is incremented on each cycle of a test.  This is used to
detect a stalled task - a test that is no longer running. */
static volatile unsigned portLONG ulLoopCounter = 0;
 
/* Handles to the test tasks. */
xTaskHandle xMediumPriorityTask, xHighPriorityTask, xHighestPriorityTask;
/*-----------------------------------------------------------*/
 
void vStartQueuePeekTasks( void )
{
xQueueHandle xQueue;
 
        /* Create the queue that we are going to use for the test/demo. */
        xQueue = xQueueCreate( qpeekQUEUE_LENGTH, sizeof( unsigned portLONG ) );
 
        /* vQueueAddToRegistry() adds the queue to the queue registry, if one is
        in use.  The queue registry is provided as a means for kernel aware
        debuggers to locate queues and has no purpose if a kernel aware debugger
        is not being used.  The call to vQueueAddToRegistry() will be removed
        by the pre-processor if configQUEUE_REGISTRY_SIZE is not defined or is
        defined to be less than 1. */
        vQueueAddToRegistry( xQueue, ( signed portCHAR * ) "QPeek_Test_Queue" );
 
        /* Create the demo tasks and pass it the queue just created.  We are
        passing the queue handle by value so it does not matter that it is declared
        on the stack here. */
        xTaskCreate( prvLowPriorityPeekTask, ( signed portCHAR * )"PeekL", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekLOW_PRIORITY, NULL );
        xTaskCreate( prvMediumPriorityPeekTask, ( signed portCHAR * )"PeekM", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekMEDIUM_PRIORITY, &xMediumPriorityTask );
        xTaskCreate( prvHighPriorityPeekTask, ( signed portCHAR * )"PeekH1", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekHIGH_PRIORITY, &xHighPriorityTask );
        xTaskCreate( prvHighestPriorityPeekTask, ( signed portCHAR * )"PeekH2", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekHIGHEST_PRIORITY, &xHighestPriorityTask );
}
/*-----------------------------------------------------------*/
 
static void prvHighestPriorityPeekTask( void *pvParameters )
{
xQueueHandle xQueue = ( xQueueHandle ) pvParameters;
unsigned portLONG ulValue;
 
        #ifdef USE_STDIO
        {
                void vPrintDisplayMessage( const portCHAR * const * ppcMessageToSend );
 
                const portCHAR * const pcTaskStartMsg = "Queue peek test started.\r\n";
 
                /* Queue a message for printing to say the task has started. */
                vPrintDisplayMessage( &pcTaskStartMsg );
        }
        #endif
 
        for( ;; )
        {
                /* Try peeking from the queue.  The queue should be empty so we will
                block, allowing the high priority task to execute. */
                if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        /* We expected to have received something by the time we unblock. */
                        xErrorDetected = pdTRUE;
                }
 
                /* When we reach here the high and medium priority tasks should still
                be blocked on the queue.  We unblocked because the low priority task
                wrote a value to the queue, which we should have peeked.  Peeking the
                data (rather than receiving it) will leave the data on the queue, so
                the high priority task should then have also been unblocked, but not
                yet executed. */
                if( ulValue != 0x11223344 )
                {
                        /* We did not receive the expected value. */
                        xErrorDetected = pdTRUE;
                }
 
                if( uxQueueMessagesWaiting( xQueue ) != 1 )
                {
                        /* The message should have been left on the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* Now we are going to actually receive the data, so when the high
                priority task runs it will find the queue empty and return to the
                blocked state. */
                ulValue = 0;
                if( xQueueReceive( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )
                {
                        /* We expected to receive the value. */
                        xErrorDetected = pdTRUE;
                }
 
                if( ulValue != 0x11223344 )
                {
                        /* We did not receive the expected value - which should have been
                        the same value as was peeked. */
                        xErrorDetected = pdTRUE;
                }
 
                /* Now we will block again as the queue is once more empty.  The low
                priority task can then execute again. */
                if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        /* We expected to have received something by the time we unblock. */
                        xErrorDetected = pdTRUE;
                }
 
                /* When we get here the low priority task should have again written to the
                queue. */
                if( ulValue != 0x01234567 )
                {
                        /* We did not receive the expected value. */
                        xErrorDetected = pdTRUE;
                }
 
                if( uxQueueMessagesWaiting( xQueue ) != 1 )
                {
                        /* The message should have been left on the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* We only peeked the data, so suspending ourselves now should enable
                the high priority task to also peek the data.  The high priority task
                will have been unblocked when we peeked the data as we left the data
                in the queue. */
                vTaskSuspend( NULL );
 
 
 
                /* This time we are going to do the same as the above test, but the
                high priority task is going to receive the data, rather than peek it.
                This means that the medium priority task should never peek the value. */
                if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        xErrorDetected = pdTRUE;
                }
 
                if( ulValue != 0xaabbaabb )
                {
                        xErrorDetected = pdTRUE;
                }
 
                vTaskSuspend( NULL );
        }
}
/*-----------------------------------------------------------*/
 
static void prvHighPriorityPeekTask( void *pvParameters )
{
xQueueHandle xQueue = ( xQueueHandle ) pvParameters;
unsigned portLONG ulValue;
 
        for( ;; )
        {
                /* Try peeking from the queue.  The queue should be empty so we will
                block, allowing the medium priority task to execute.  Both the high
                and highest priority tasks will then be blocked on the queue. */
                if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        /* We expected to have received something by the time we unblock. */
                        xErrorDetected = pdTRUE;
                }
 
                /* When we get here the highest priority task should have peeked the data
                (unblocking this task) then suspended (allowing this task to also peek
                the data). */
                if( ulValue != 0x01234567 )
                {
                        /* We did not receive the expected value. */
                        xErrorDetected = pdTRUE;
                }
 
                if( uxQueueMessagesWaiting( xQueue ) != 1 )
                {
                        /* The message should have been left on the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* We only peeked the data, so suspending ourselves now should enable
                the medium priority task to also peek the data.  The medium priority task
                will have been unblocked when we peeked the data as we left the data
                in the queue. */
                vTaskSuspend( NULL );
 
 
                /* This time we are going actually receive the value, so the medium
                priority task will never peek the data - we removed it from the queue. */
                if( xQueueReceive( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        xErrorDetected = pdTRUE;
                }
 
                if( ulValue != 0xaabbaabb )
                {
                        xErrorDetected = pdTRUE;
                }
 
                vTaskSuspend( NULL );
        }
}
/*-----------------------------------------------------------*/
 
static void prvMediumPriorityPeekTask( void *pvParameters )
{
xQueueHandle xQueue = ( xQueueHandle ) pvParameters;
unsigned portLONG ulValue;
 
        for( ;; )
        {
                /* Try peeking from the queue.  The queue should be empty so we will
                block, allowing the low priority task to execute.  The highest, high
                and medium priority tasks will then all be blocked on the queue. */
                if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )
                {
                        /* We expected to have received something by the time we unblock. */
                        xErrorDetected = pdTRUE;
                }
 
                /* When we get here the high priority task should have peeked the data
                (unblocking this task) then suspended (allowing this task to also peek
                the data). */
                if( ulValue != 0x01234567 )
                {
                        /* We did not receive the expected value. */
                        xErrorDetected = pdTRUE;
                }
 
                if( uxQueueMessagesWaiting( xQueue ) != 1 )
                {
                        /* The message should have been left on the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* Just so we know the test is still running. */
                ulLoopCounter++;
 
                /* Now we can suspend ourselves so the low priority task can execute
                again. */
                vTaskSuspend( NULL );
        }
}
/*-----------------------------------------------------------*/
 
static void prvLowPriorityPeekTask( void *pvParameters )
{
xQueueHandle xQueue = ( xQueueHandle ) pvParameters;
unsigned portLONG ulValue;
 
        for( ;; )
        {
                /* Write some data to the queue.  This should unblock the highest
                priority task that is waiting to peek data from the queue. */
                ulValue = 0x11223344;
                if( xQueueSendToBack( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )
                {
                        /* We were expecting the queue to be empty so we should not of
                        had a problem writing to the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* By the time we get here the data should have been removed from
                the queue. */
                if( uxQueueMessagesWaiting( xQueue ) != 0 )
                {
                        xErrorDetected = pdTRUE;
                }
 
                /* Write another value to the queue, again waking the highest priority
                task that is blocked on the queue. */
                ulValue = 0x01234567;
                if( xQueueSendToBack( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )
                {
                        /* We were expecting the queue to be empty so we should not of
                        had a problem writing to the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* All the other tasks should now have successfully peeked the data.
                The data is still in the queue so we should be able to receive it. */
                ulValue = 0;
                if( xQueueReceive( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )
                {
                        /* We expected to receive the data. */
                        xErrorDetected = pdTRUE;
                }
 
                if( ulValue != 0x01234567 )
                {
                        /* We did not receive the expected value. */
                }
 
                /* Lets just delay a while as this is an intensive test as we don't
                want to starve other tests of processing time. */
                vTaskDelay( qpeekSHORT_DELAY );
 
                /* Unsuspend the other tasks so we can repeat the test - this time
                however not all the other tasks will peek the data as the high
                priority task is actually going to remove it from the queue.  Send
                to front is used just to be different.  As the queue is empty it
                makes no difference to the result. */
                vTaskResume( xMediumPriorityTask );
                vTaskResume( xHighPriorityTask );
                vTaskResume( xHighestPriorityTask );
 
                ulValue = 0xaabbaabb;
                if( xQueueSendToFront( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )
                {
                        /* We were expecting the queue to be empty so we should not of
                        had a problem writing to the queue. */
                        xErrorDetected = pdTRUE;
                }
 
                /* This time we should find that the queue is empty.  The high priority
                task actually removed the data rather than just peeking it. */
                if( xQueuePeek( xQueue, &ulValue, qpeekNO_BLOCK ) != errQUEUE_EMPTY )
                {
                        /* We expected to receive the data. */
                        xErrorDetected = pdTRUE;
                }
 
                /* Unsuspend the highest and high priority tasks so we can go back
                and repeat the whole thing.  The medium priority task should not be
                suspended as it was not able to peek the data in this last case. */
                vTaskResume( xHighPriorityTask );
                vTaskResume( xHighestPriorityTask );
 
                /* Lets just delay a while as this is an intensive test as we don't
                want to starve other tests of processing time. */
                vTaskDelay( qpeekSHORT_DELAY );
        }
}
/*-----------------------------------------------------------*/
 
/* This is called to check that all the created tasks are still running. */
portBASE_TYPE xAreQueuePeekTasksStillRunning( void )
{
static unsigned portLONG ulLastLoopCounter = 0;
 
        /* If the demo task is still running then we expect the loopcounter to
        have incremented since this function was last called. */
        if( ulLastLoopCounter == ulLoopCounter )
        {
                xErrorDetected = pdTRUE;
        }
 
        ulLastLoopCounter = ulLoopCounter;
 
        /* Errors detected in the task itself will have latched xErrorDetected
        to true. */
 
        return !xErrorDetected;
}
 

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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [Minimal/] [QPeek.c] - Blame information for rev 773

Line No.	Rev	Author	Line
1	606	jeremybenn	`/*`
2			`FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.`
3
4			`***************************************************************************`
5			`* *`
6			`* If you are: *`
7			`* *`
8			`* + New to FreeRTOS, *`
9			`* + Wanting to learn FreeRTOS or multitasking in general quickly *`
10			`* + Looking for basic training, *`
11			`* + Wanting to improve your FreeRTOS skills and productivity *`
12			`* *`
13			`* then take a look at the FreeRTOS books - available as PDF or paperback *`
14			`* *`
15			`* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *`
16			`* http://www.FreeRTOS.org/Documentation *`
17			`* *`
18			`* A pdf reference manual is also available. Both are usually delivered *`
19			`* to your inbox within 20 minutes to two hours when purchased between 8am *`
20			`* and 8pm GMT (although please allow up to 24 hours in case of *`
21			`* exceptional circumstances). Thank you for your support! *`
22			`* *`
23			`***************************************************************************`
24
25			`This file is part of the FreeRTOS distribution.`
26
27			`FreeRTOS is free software; you can redistribute it and/or modify it under`
28			`the terms of the GNU General Public License (version 2) as published by the`
29			`Free Software Foundation AND MODIFIED BY the FreeRTOS exception.`
30			`*NOTE* The exception to the GPL is included to allow you to distribute`
31			`a combined work that includes FreeRTOS without being obliged to provide the`
32			`source code for proprietary components outside of the FreeRTOS kernel.`
33			`FreeRTOS is distributed in the hope that it will be useful, but WITHOUT`
34			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
35			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
36			`more details. You should have received a copy of the GNU General Public`
37			`License and the FreeRTOS license exception along with FreeRTOS; if not it`
38			`can be viewed here: http://www.freertos.org/a00114.html and also obtained`
39			`by writing to Richard Barry, contact details for whom are available on the`
40			`FreeRTOS WEB site.`
41
42			`1 tab == 4 spaces!`
43
44			`http://www.FreeRTOS.org - Documentation, latest information, license and`
45			`contact details.`
46
47			`http://www.SafeRTOS.com - A version that is certified for use in safety`
48			`critical systems.`
49
50			`http://www.OpenRTOS.com - Commercial support, development, porting,`
51			`licensing and training services.`
52			`*/`
53
54
55			`/*`
56			`* Tests the behaviour when data is peeked from a queue when there are`
57			`* multiple tasks blocked on the queue.`
58			`*/`
59
60
61			`#include <stdlib.h>`
62
63			`/* Scheduler include files. */`
64			`#include "FreeRTOS.h"`
65			`#include "task.h"`
66			`#include "queue.h"`
67			`#include "semphr.h"`
68
69			`/* Demo program include files. */`
70			`#include "QPeek.h"`
71
72			`#define qpeekQUEUE_LENGTH ( 5 )`
73			`#define qpeekNO_BLOCK ( 0 )`
74			`#define qpeekSHORT_DELAY ( 10 )`
75
76			`#define qpeekLOW_PRIORITY ( tskIDLE_PRIORITY + 0 )`
77			`#define qpeekMEDIUM_PRIORITY ( tskIDLE_PRIORITY + 1 )`
78			`#define qpeekHIGH_PRIORITY ( tskIDLE_PRIORITY + 2 )`
79			`#define qpeekHIGHEST_PRIORITY ( tskIDLE_PRIORITY + 3 )`
80
81			`/-----------------------------------------------------------/`
82
83			`/*`
84			`* The following three tasks are used to demonstrate the peeking behaviour.`
85			`* Each task is given a different priority to demonstrate the order in which`
86			`* tasks are woken as data is peeked from a queue.`
87			`*/`
88			`static void prvLowPriorityPeekTask( void *pvParameters );`
89			`static void prvMediumPriorityPeekTask( void *pvParameters );`
90			`static void prvHighPriorityPeekTask( void *pvParameters );`
91			`static void prvHighestPriorityPeekTask( void *pvParameters );`
92
93			`/-----------------------------------------------------------/`
94
95			`/* Flag that will be latched to pdTRUE should any unexpected behaviour be`
96			`detected in any of the tasks. */`
97			`static volatile portBASE_TYPE xErrorDetected = pdFALSE;`
98
99			`/* Counter that is incremented on each cycle of a test. This is used to`
100			`detect a stalled task - a test that is no longer running. */`
101			`static volatile unsigned portLONG ulLoopCounter = 0;`
102
103			`/* Handles to the test tasks. */`
104			`xTaskHandle xMediumPriorityTask, xHighPriorityTask, xHighestPriorityTask;`
105			`/-----------------------------------------------------------/`
106
107			`void vStartQueuePeekTasks( void )`
108			`{`
109			`xQueueHandle xQueue;`
110
111			`/* Create the queue that we are going to use for the test/demo. */`
112			`xQueue = xQueueCreate( qpeekQUEUE_LENGTH, sizeof( unsigned portLONG ) );`
113
114			`/* vQueueAddToRegistry() adds the queue to the queue registry, if one is`
115			`in use. The queue registry is provided as a means for kernel aware`
116			`debuggers to locate queues and has no purpose if a kernel aware debugger`
117			`is not being used. The call to vQueueAddToRegistry() will be removed`
118			`by the pre-processor if configQUEUE_REGISTRY_SIZE is not defined or is`
119			`defined to be less than 1. */`
120			`vQueueAddToRegistry( xQueue, ( signed portCHAR * ) "QPeek_Test_Queue" );`
121
122			`/* Create the demo tasks and pass it the queue just created. We are`
123			`passing the queue handle by value so it does not matter that it is declared`
124			`on the stack here. */`
125			`xTaskCreate( prvLowPriorityPeekTask, ( signed portCHAR * )"PeekL", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekLOW_PRIORITY, NULL );`
126			`xTaskCreate( prvMediumPriorityPeekTask, ( signed portCHAR * )"PeekM", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekMEDIUM_PRIORITY, &xMediumPriorityTask );`
127			`xTaskCreate( prvHighPriorityPeekTask, ( signed portCHAR * )"PeekH1", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekHIGH_PRIORITY, &xHighPriorityTask );`
128			`xTaskCreate( prvHighestPriorityPeekTask, ( signed portCHAR * )"PeekH2", configMINIMAL_STACK_SIZE, ( void * ) xQueue, qpeekHIGHEST_PRIORITY, &xHighestPriorityTask );`
129			`}`
130			`/-----------------------------------------------------------/`
131
132			`static void prvHighestPriorityPeekTask( void *pvParameters )`
133			`{`
134			`xQueueHandle xQueue = ( xQueueHandle ) pvParameters;`
135			`unsigned portLONG ulValue;`
136
137			`#ifdef USE_STDIO`
138			`{`
139			`void vPrintDisplayMessage( const portCHAR * const * ppcMessageToSend );`
140
141			`const portCHAR * const pcTaskStartMsg = "Queue peek test started.\r\n";`
142
143			`/* Queue a message for printing to say the task has started. */`
144			`vPrintDisplayMessage( &pcTaskStartMsg );`
145			`}`
146			`#endif`
147
148			`for( ;; )`
149			`{`
150			`/* Try peeking from the queue. The queue should be empty so we will`
151			`block, allowing the high priority task to execute. */`
152			`if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
153			`{`
154			`/* We expected to have received something by the time we unblock. */`
155			`xErrorDetected = pdTRUE;`
156			`}`
157
158			`/* When we reach here the high and medium priority tasks should still`
159			`be blocked on the queue. We unblocked because the low priority task`
160			`wrote a value to the queue, which we should have peeked. Peeking the`
161			`data (rather than receiving it) will leave the data on the queue, so`
162			`the high priority task should then have also been unblocked, but not`
163			`yet executed. */`
164			`if( ulValue != 0x11223344 )`
165			`{`
166			`/* We did not receive the expected value. */`
167			`xErrorDetected = pdTRUE;`
168			`}`
169
170			`if( uxQueueMessagesWaiting( xQueue ) != 1 )`
171			`{`
172			`/* The message should have been left on the queue. */`
173			`xErrorDetected = pdTRUE;`
174			`}`
175
176			`/* Now we are going to actually receive the data, so when the high`
177			`priority task runs it will find the queue empty and return to the`
178			`blocked state. */`
179			`ulValue = 0;`
180			`if( xQueueReceive( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )`
181			`{`
182			`/* We expected to receive the value. */`
183			`xErrorDetected = pdTRUE;`
184			`}`
185
186			`if( ulValue != 0x11223344 )`
187			`{`
188			`/* We did not receive the expected value - which should have been`
189			`the same value as was peeked. */`
190			`xErrorDetected = pdTRUE;`
191			`}`
192
193			`/* Now we will block again as the queue is once more empty. The low`
194			`priority task can then execute again. */`
195			`if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
196			`{`
197			`/* We expected to have received something by the time we unblock. */`
198			`xErrorDetected = pdTRUE;`
199			`}`
200
201			`/* When we get here the low priority task should have again written to the`
202			`queue. */`
203			`if( ulValue != 0x01234567 )`
204			`{`
205			`/* We did not receive the expected value. */`
206			`xErrorDetected = pdTRUE;`
207			`}`
208
209			`if( uxQueueMessagesWaiting( xQueue ) != 1 )`
210			`{`
211			`/* The message should have been left on the queue. */`
212			`xErrorDetected = pdTRUE;`
213			`}`
214
215			`/* We only peeked the data, so suspending ourselves now should enable`
216			`the high priority task to also peek the data. The high priority task`
217			`will have been unblocked when we peeked the data as we left the data`
218			`in the queue. */`
219			`vTaskSuspend( NULL );`
220
221
222
223			`/* This time we are going to do the same as the above test, but the`
224			`high priority task is going to receive the data, rather than peek it.`
225			`This means that the medium priority task should never peek the value. */`
226			`if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
227			`{`
228			`xErrorDetected = pdTRUE;`
229			`}`
230
231			`if( ulValue != 0xaabbaabb )`
232			`{`
233			`xErrorDetected = pdTRUE;`
234			`}`
235
236			`vTaskSuspend( NULL );`
237			`}`
238			`}`
239			`/-----------------------------------------------------------/`
240
241			`static void prvHighPriorityPeekTask( void *pvParameters )`
242			`{`
243			`xQueueHandle xQueue = ( xQueueHandle ) pvParameters;`
244			`unsigned portLONG ulValue;`
245
246			`for( ;; )`
247			`{`
248			`/* Try peeking from the queue. The queue should be empty so we will`
249			`block, allowing the medium priority task to execute. Both the high`
250			`and highest priority tasks will then be blocked on the queue. */`
251			`if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
252			`{`
253			`/* We expected to have received something by the time we unblock. */`
254			`xErrorDetected = pdTRUE;`
255			`}`
256
257			`/* When we get here the highest priority task should have peeked the data`
258			`(unblocking this task) then suspended (allowing this task to also peek`
259			`the data). */`
260			`if( ulValue != 0x01234567 )`
261			`{`
262			`/* We did not receive the expected value. */`
263			`xErrorDetected = pdTRUE;`
264			`}`
265
266			`if( uxQueueMessagesWaiting( xQueue ) != 1 )`
267			`{`
268			`/* The message should have been left on the queue. */`
269			`xErrorDetected = pdTRUE;`
270			`}`
271
272			`/* We only peeked the data, so suspending ourselves now should enable`
273			`the medium priority task to also peek the data. The medium priority task`
274			`will have been unblocked when we peeked the data as we left the data`
275			`in the queue. */`
276			`vTaskSuspend( NULL );`
277
278
279			`/* This time we are going actually receive the value, so the medium`
280			`priority task will never peek the data - we removed it from the queue. */`
281			`if( xQueueReceive( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
282			`{`
283			`xErrorDetected = pdTRUE;`
284			`}`
285
286			`if( ulValue != 0xaabbaabb )`
287			`{`
288			`xErrorDetected = pdTRUE;`
289			`}`
290
291			`vTaskSuspend( NULL );`
292			`}`
293			`}`
294			`/-----------------------------------------------------------/`
295
296			`static void prvMediumPriorityPeekTask( void *pvParameters )`
297			`{`
298			`xQueueHandle xQueue = ( xQueueHandle ) pvParameters;`
299			`unsigned portLONG ulValue;`
300
301			`for( ;; )`
302			`{`
303			`/* Try peeking from the queue. The queue should be empty so we will`
304			`block, allowing the low priority task to execute. The highest, high`
305			`and medium priority tasks will then all be blocked on the queue. */`
306			`if( xQueuePeek( xQueue, &ulValue, portMAX_DELAY ) != pdPASS )`
307			`{`
308			`/* We expected to have received something by the time we unblock. */`
309			`xErrorDetected = pdTRUE;`
310			`}`
311
312			`/* When we get here the high priority task should have peeked the data`
313			`(unblocking this task) then suspended (allowing this task to also peek`
314			`the data). */`
315			`if( ulValue != 0x01234567 )`
316			`{`
317			`/* We did not receive the expected value. */`
318			`xErrorDetected = pdTRUE;`
319			`}`
320
321			`if( uxQueueMessagesWaiting( xQueue ) != 1 )`
322			`{`
323			`/* The message should have been left on the queue. */`
324			`xErrorDetected = pdTRUE;`
325			`}`
326
327			`/* Just so we know the test is still running. */`
328			`ulLoopCounter++;`
329
330			`/* Now we can suspend ourselves so the low priority task can execute`
331			`again. */`
332			`vTaskSuspend( NULL );`
333			`}`
334			`}`
335			`/-----------------------------------------------------------/`
336
337			`static void prvLowPriorityPeekTask( void *pvParameters )`
338			`{`
339			`xQueueHandle xQueue = ( xQueueHandle ) pvParameters;`
340			`unsigned portLONG ulValue;`
341
342			`for( ;; )`
343			`{`
344			`/* Write some data to the queue. This should unblock the highest`
345			`priority task that is waiting to peek data from the queue. */`
346			`ulValue = 0x11223344;`
347			`if( xQueueSendToBack( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )`
348			`{`
349			`/* We were expecting the queue to be empty so we should not of`
350			`had a problem writing to the queue. */`
351			`xErrorDetected = pdTRUE;`
352			`}`
353
354			`/* By the time we get here the data should have been removed from`
355			`the queue. */`
356			`if( uxQueueMessagesWaiting( xQueue ) != 0 )`
357			`{`
358			`xErrorDetected = pdTRUE;`
359			`}`
360
361			`/* Write another value to the queue, again waking the highest priority`
362			`task that is blocked on the queue. */`
363			`ulValue = 0x01234567;`
364			`if( xQueueSendToBack( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )`
365			`{`
366			`/* We were expecting the queue to be empty so we should not of`
367			`had a problem writing to the queue. */`
368			`xErrorDetected = pdTRUE;`
369			`}`
370
371			`/* All the other tasks should now have successfully peeked the data.`
372			`The data is still in the queue so we should be able to receive it. */`
373			`ulValue = 0;`
374			`if( xQueueReceive( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )`
375			`{`
376			`/* We expected to receive the data. */`
377			`xErrorDetected = pdTRUE;`
378			`}`
379
380			`if( ulValue != 0x01234567 )`
381			`{`
382			`/* We did not receive the expected value. */`
383			`}`
384
385			`/* Lets just delay a while as this is an intensive test as we don't`
386			`want to starve other tests of processing time. */`
387			`vTaskDelay( qpeekSHORT_DELAY );`
388
389			`/* Unsuspend the other tasks so we can repeat the test - this time`
390			`however not all the other tasks will peek the data as the high`
391			`priority task is actually going to remove it from the queue. Send`
392			`to front is used just to be different. As the queue is empty it`
393			`makes no difference to the result. */`
394			`vTaskResume( xMediumPriorityTask );`
395			`vTaskResume( xHighPriorityTask );`
396			`vTaskResume( xHighestPriorityTask );`
397
398			`ulValue = 0xaabbaabb;`
399			`if( xQueueSendToFront( xQueue, &ulValue, qpeekNO_BLOCK ) != pdPASS )`
400			`{`
401			`/* We were expecting the queue to be empty so we should not of`
402			`had a problem writing to the queue. */`
403			`xErrorDetected = pdTRUE;`
404			`}`
405
406			`/* This time we should find that the queue is empty. The high priority`
407			`task actually removed the data rather than just peeking it. */`
408			`if( xQueuePeek( xQueue, &ulValue, qpeekNO_BLOCK ) != errQUEUE_EMPTY )`
409			`{`
410			`/* We expected to receive the data. */`
411			`xErrorDetected = pdTRUE;`
412			`}`
413
414			`/* Unsuspend the highest and high priority tasks so we can go back`
415			`and repeat the whole thing. The medium priority task should not be`
416			`suspended as it was not able to peek the data in this last case. */`
417			`vTaskResume( xHighPriorityTask );`
418			`vTaskResume( xHighestPriorityTask );`
419
420			`/* Lets just delay a while as this is an intensive test as we don't`
421			`want to starve other tests of processing time. */`
422			`vTaskDelay( qpeekSHORT_DELAY );`
423			`}`
424			`}`
425			`/-----------------------------------------------------------/`
426
427			`/* This is called to check that all the created tasks are still running. */`
428			`portBASE_TYPE xAreQueuePeekTasksStillRunning( void )`
429			`{`
430			`static unsigned portLONG ulLastLoopCounter = 0;`
431
432			`/* If the demo task is still running then we expect the loopcounter to`
433			`have incremented since this function was last called. */`
434			`if( ulLastLoopCounter == ulLoopCounter )`
435			`{`
436			`xErrorDetected = pdTRUE;`
437			`}`
438
439			`ulLastLoopCounter = ulLoopCounter;`
440
441			`/* Errors detected in the task itself will have latched xErrorDetected`
442			`to true. */`
443
444			`return !xErrorDetected;`
445			`}`
446