ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/os/kernel/include/chmsg.h

@@ -0,0 +1,92 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011,2012,2013 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT 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 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
+
+                                      ---
+
+    A special exception to the GPL can be applied should you wish to distribute
+    a combined work that includes ChibiOS/RT, without being obliged to provide
+    the source code for any proprietary components. See the file exception.txt
+    for full details of how and when the exception can be applied.
+*/
+
+/**
+ * @file    chmsg.h
+ * @brief   Messages macros and structures.
+ *
+ * @addtogroup messages
+ * @{
+ */
+
+#ifndef _CHMSG_H_
+#define _CHMSG_H_
+
+#if CH_USE_MESSAGES || defined(__DOXYGEN__)
+
+/**
+ * @name    Macro Functions
+ * @{
+ */
+/**
+ * @brief   Evaluates to TRUE if the thread has pending messages.
+ *
+ * @iclass
+ */
+#define chMsgIsPendingI(tp) \
+        ((tp)->p_msgqueue.p_next != (Thread *)&(tp)->p_msgqueue)
+
+/**
+ * @brief   Returns the message carried by the specified thread.
+ * @pre     This function must be invoked immediately after exiting a call
+ *          to @p chMsgWait().
+ *
+ * @param[in] tp        pointer to the thread
+ * @return              The message carried by the sender.
+ *
+ * @api
+ */
+#define chMsgGet(tp) ((tp)->p_msg)
+
+/**
+ * @brief   Releases the thread waiting on top of the messages queue.
+ * @pre     Invoke this function only after a message has been received
+ *          using @p chMsgWait().
+ *
+ * @param[in] tp        pointer to the thread
+ * @param[in] msg       message to be returned to the sender
+ *
+ * @sclass
+ */
+#define chMsgReleaseS(tp, msg) chSchWakeupS(tp, msg)
+/** @} */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  msg_t chMsgSend(Thread *tp, msg_t msg);
+  Thread * chMsgWait(void);
+  void chMsgRelease(Thread *tp, msg_t msg);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CH_USE_MESSAGES */
+
+#endif /* _CHMSG_H_ */
+
+/** @} */