TreelLab/prog/sources/task-list-32-tasks.cpp

#include "all-headers.h"


#define ENABLE_TASK_LIST_ASSERTIONS


#ifdef ENABLE_TASK_LIST_ASSERTIONS
  #define TASK_LIST_ASSERT_NON_NULL_POINTER(ptr) assertNonNullPointer (ptr, __FILE__, __LINE__) ;
#else
  #define TASK_LIST_ASSERT_NON_NULL_POINTER(ptr)
#endif


#ifdef ENABLE_TASK_LIST_ASSERTIONS
  #define TASK_LIST_ASSERT(condition,value) assertion (condition, value, __FILE__, __LINE__) ;
#else
  #define TASK_LIST_ASSERT(condition,value)
#endif

// ENTER TASK IN LIST: inTask should be not null

void TaskList::enterTask (SECTION_MODE_ TaskControlBlock * inTaskPtr) {
	TASK_LIST_ASSERT_NON_NULL_POINTER (inTaskPtr) ;
	const uint32_t taskIndex = indexForDescriptorTask (inTaskPtr) ;
	TASK_LIST_ASSERT (taskIndex < TASK_COUNT, taskIndex) ;
	const uint32_t mask = 1U << taskIndex ;
	mList |= mask ;
}

// REMOVE FIRST TASK FROM LIST: returns nullptr if list is empty                                                      *

TaskControlBlock * TaskList::removeFirstTask (IRQ_MODE) {
	TaskControlBlock * taskPtr = nullptr ;
	if (mList != 0) {
		const uint32_t taskIndex = (uint32_t) __builtin_ctz (mList) ;
		TASK_LIST_ASSERT (taskIndex < TASK_COUNT, taskIndex) ;
		const uint32_t mask = 1U << taskIndex ;
		mList &= ~ mask ;
		taskPtr = descriptorPointerForTaskIndex (taskIndex) ;
	}
	return taskPtr ;
}

// REMOVE A TASK FROM LIST

void TaskList::removeTask (SECTION_MODE_ TaskControlBlock * inTaskPtr) {
	TASK_LIST_ASSERT_NON_NULL_POINTER (inTaskPtr) ;
	const uint32_t taskIndex = indexForDescriptorTask (inTaskPtr) ;
	TASK_LIST_ASSERT (taskIndex < TASK_COUNT, taskIndex) ;
	const uint32_t mask = 1U << taskIndex ;
	mList &= ~ mask ;
}

// REMOVE FIRST TASK FROM LIST: returns nullptr if list is empty                                                      *

TaskControlBlock * TaskList::Iterator::nextTask (IRQ_MODE) {
	TaskControlBlock * taskPtr = nullptr ;
	if (mIteratedList != 0) {
		const uint32_t taskIndex = (uint32_t) __builtin_ctz (mIteratedList) ;
		TASK_LIST_ASSERT (taskIndex < TASK_COUNT, taskIndex) ;
		const uint32_t mask = 1U << taskIndex ;
		mIteratedList &= ~ mask ;
		taskPtr = descriptorPointerForTaskIndex (taskIndex) ;
	}
	return taskPtr ;
}