/** @file task.h
 * Module handling the task creation and management
 *
 * The module provides an API to create, run and manage lightweight, stack-less
 * threads (tasks). This system is based on protothreads,
 * see https://dunkels.com/adam/pt/index.html
 */

#ifndef _task_h_
#define _task_h_

//--includes--------------------------------------------------------------------

#include <stdint.h>


//--functions-------------------------------------------------------------------

#define TASK(fct_name) uint8_t fct_name(uint8_t __task_context)

#define task_begin() do {     \
	_TASK_COUNT_INIT;         \
	switch (__task_context) { \
	} while (0)

#define task_end() do {      \
	}                        \
	return _TASK_COUNT_STOP; \
	while (0)

#define task_wait_until(cond) _task_wait_until(cond, _TASK_COUNT_INCR)


//--internal_functions----------------------------------------------------------

#define _TASK_COUNT_INIT enum { TASK_COUNTER_BASE = __COUNTER__ }
#define _TASK_COUNT_INCR (uint8_t)(__COUNTER__ - TASK_COUNTER_BASE - 1)
#define _TASK_COUNT_STOP UINT8_MAX

#define _task(fct_name)

#define _task_wait_until(cond, count) do { \
	case (count):                          \
		if (!(cond)) {                     \
			return count;                  \
		}                                  \
		/* fall through */                 \
	while (0)


#endif //_task_h_