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bertos/cfg/module.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \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
+ *
+ * \author Bernie Innocenti <bernie@codewiz.org>
+ */
+#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(extern bool module ## _initialized; 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 */
+