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Add vTaskEnterCritical() and vTaskExitCritical() functions.

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This commit is contained in:
Richard Barry 2008-02-25 18:54:28 +00:00
parent ebf69dab5d
commit 2b174e556c
2 changed files with 54 additions and 2 deletions
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4
Source/include/FreeRTOS.h
View File

@ -134,6 +134,10 @@
#define configUSE_ALTERNATIVE_API 0
#endif
#ifndef portCRITICAL_NESTING_IN_TCB
#define portCRITICAL_NESTING_IN_TCB 0
#endif
#if ( configUSE_MUTEXES == 1 )
/* xTaskGetCurrentTaskHandle is used by the priority inheritance mechanism
within the mutex implementation so must be available if mutexes are used. */

52
Source/tasks.c
View File

@ -266,6 +266,10 @@ typedef struct tskTaskControlBlock
portSTACK_TYPE *pxStack; /*< Points to the start of the stack. */
signed portCHAR pcTaskName[ configMAX_TASK_NAME_LEN ];/*< Descriptive name given to the task when created. Facilitates debugging only. */
#if ( portCRITICAL_NESTING_IN_TCB == 1 )
unsigned portBASE_TYPE uxCriticalNesting;
#endif
#if ( configUSE_TRACE_FACILITY == 1 )
unsigned portBASE_TYPE uxTCBNumber; /*< This is used for tracing the scheduler and making debugging easier only. */
#endif
@ -1755,6 +1759,12 @@ static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed portCHAR * co
strncpy( ( char * ) pxTCB->pcTaskName, ( const char * ) pcName, ( unsigned portSHORT ) configMAX_TASK_NAME_LEN );
pxTCB->pcTaskName[ ( unsigned portSHORT ) configMAX_TASK_NAME_LEN - ( unsigned portSHORT ) 1 ] = '\0';
#if ( portCRITICAL_NESTING_IN_TCB == 1 )
{
pxTCB->uxCriticalNesting = ( unsigned portBASE_TYPE ) 0;
}
#endif
/* This is used as an array index so must ensure it's not too large. */
if( uxPriority >= configMAX_PRIORITIES )
{
@ -1983,6 +1993,7 @@ tskTCB *pxNewTCB;
}
#endif
/*-----------------------------------------------------------*/
#if ( configUSE_MUTEXES == 1 )
@ -2014,6 +2025,7 @@ tskTCB *pxNewTCB;
}
#endif
/*-----------------------------------------------------------*/
#if ( configUSE_MUTEXES == 1 )
@ -2039,8 +2051,44 @@ tskTCB *pxNewTCB;
}
#endif
/*-----------------------------------------------------------*/
#if ( portCRITICAL_NESTING_IN_TCB == 1 )
void vTaskEnterCritical( void )
{
portDISABLE_INTERRUPTS();
if( xSchedulerRunning != pdFALSE )
{
pxCurrentTCB->uxCriticalNesting++;
}
}
#endif
/*-----------------------------------------------------------*/
#if ( portCRITICAL_NESTING_IN_TCB == 1 )
void vTaskExitCritical( void )
{
if( xSchedulerRunning != pdFALSE )
{
if( pxCurrentTCB->uxCriticalNesting > 0 )
{
pxCurrentTCB->uxCriticalNesting--;
if( pxCurrentTCB->uxCriticalNesting == 0 )
{
portENABLE_INTERRUPTS();
}
}
}
}
#endif
/*-----------------------------------------------------------*/