Write first API macros

srv/task.c

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+/** @file task.c
+ * 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
+ */
+

srv/task.h

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+/** @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_
+