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Fix context switch when time slicing is off (#568)

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* Fix context switch when time slicing is off

When time slicing is off, context switch should only happen when a
task with priority higher than the currently executing one is unblocked.
Earlier the code was invoking a context switch even when a task with
priority equal the currently executing task was unblocked. This commit
fixes the code to only do a context switch when a higher priority
task is unblocked.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav-Aggarwal-AWS 2022-11-08 14:05:35 +05:30 committed by GitHub
parent 44e02bff31
commit 1072988de7
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 4 deletions
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12
tasks.c
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@ -2812,10 +2812,14 @@ BaseType_t xTaskIncrementTick( void )
#if ( configUSE_PREEMPTION == 1 )
{
/* Preemption is on, but a context switch should
* only be performed if the unblocked task has a
* priority that is equal to or higher than the
* currently executing task. */
if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
* only be performed if the unblocked task's
* priority is higher than the currently executing
* task.
* The case of equal priority tasks sharing
* processing time (which happens when both
* preemption and time slicing are on) is
* handled below.*/
if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
{
xSwitchRequired = pdTRUE;
}