Kernel Control
[API]

Modules

• taskYIELD
• taskENTER_CRITICAL
• taskEXIT_CRITICAL
• taskENTER_CRITICAL_FROM_ISR
• taskEXIT_CRITICAL_FROM_ISR
• taskDISABLE_INTERRUPTS
• taskENABLE_INTERRUPTS
• vTaskStartScheduler
• vTaskEndScheduler
• vTaskSuspendAll
• xTaskResumeAll
• vTaskStepTick

Detailed Description

taskYIELD

taskYIELD() is used to request a context switch to another task. However, if there are no other tasks at a higher or equal priority to the task that calls taskYIELD() then the RTOS scheduler will simply select the task that called taskYIELD() to run again.

If configUSE_PREEMPTION is set to 1 then the RTOS scheduler will always be running the highest priority task that is able to run, so calling taskYIELD() will never result in a switch to a higher priority task.

taskDISABLE_INTERRUPTS()

If the port in use supports the configMAX_SYSCALL_INTERRUPT_PRIORITY (or configMAX_API_CALL_INTERRUPT_PRIORITY) constant, then taskDISABLE_INTERRUPTS will either disable all interrupts, or mask (disable) interrupts up to the configMAX_SYSCALL_INTERRUPT_PRIORITY setting. Check the implementation of taskDISABLE_INTERRUPTS for the port in use.

If the port in use does not support the configMAX_SYSCALL_INTERRUPT_PRIORITY constant then taskDISABLE_INTERRUPTS() will globally disable all maskable interrupts.

Normally this macro would not be called directly and taskENTER_CRITICAL() and taskEXIT_CRITICAL() should be used in its place.

taskENABLE_INTERRUPTS()

Macro to enable microcontroller interrupts.

Normally this macro would not be called directly and taskENTER_CRITICAL() and taskEXIT_CRITICAL() should be used in its place.