Macros for intermodule dependency checks.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@518 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/cfg/module.h b/cfg/module.h
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+/*!
+ * \file
+ * <!--
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * This file is part of DevLib - See README.devlib for information.
+ * -->
+ *
+ * \brief Debug macros for inter-module dependency checking.
+ *
+ * These macros expand to nothing in release builds.  In debug
+ * builds, they perform run-time dependency checks for modules.
+ *
+ * The usage pattern looks like this:
+ *
+ * \code
+ * MOD_DEFINE(phaser)
+ *
+ * void phaser_init(void)
+ * {
+ *     MOD_CHECK(computer);
+ *     MOD_CHECK(warp_core);
+ *
+ *    [...charge weapons...]
+ *
+ *    MOD_INIT(phaser);
+ * }
+ *
+ * void phaser_cleanup(void)
+ * {
+ *    MOD_CLEANUP(phaser);
+ *
+ *    [...disarm phaser...]
+ * }
+ * \endcode
+ *
+ * \version $Id$
+ * \author Bernardo Innocenti <bernie@develer.com>
+ */
+#ifndef CFG_MODULE_H
+#define CFG_MODULE_H
+
+#include <cfg/debug.h>
+
+/**
+ * Declare a global variable for module dependency check.
+ *
+ * \see MOD_INIT(), MOD_CHECK()
+ */
+#define MOD_DEFINE(module)   DB(bool module ## _initialized;)
+
+/**
+ * Check that \a module was already initialized.
+ *
+ * Put this check just before accessing any facility
+ * provided by a module that requires prior initialization.
+ *
+ * \see MOD_INIT()
+ */
+
+#define MOD_CHECK(module) \
+do { \
+       DB(extern bool module ## _initialized;) \
+       ASSERT(module ## _initialized); \
+} while (0)
+
+/**
+ * Mark module as initialized.
+ *
+ * Marking initialization requires the global data
+ * previously defined by MOD_DEFINE().
+ *
+ * To prevent double initialization bugs, an initialized
+ * module must first be cleaned up with MOD_CLEANUP() before
+ * calling MOD_INIT() another time.
+ *
+ * \see MOD_CLEANUP(), MOD_CHECK(), MOD_DEFINE()
+ */
+#define MOD_INIT(module) \
+do { \
+       ASSERT(!module ## _initialized); \
+       DB(module ## _initialized = true;) \
+} while (0)
+
+/**
+ * Mark module as being no longer initialized.
+ *
+ * Marking initialization requires the global data
+ * previously defined by MOD_DEFINE().
+ *
+ * \see MOD_INIT(), MOD_CHECK(), MOD_DEFINE()
+ */
+#define MOD_CLEANUP(module) \
+do { \
+       ASSERT(module ## _initialized); \
+       DB(module ## _initialized = false;) \
+} while (0)
+
+#endif /* CFG_MODULE_H */
+