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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1560 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/kernel/include/registry.h

@@ -0,0 +1,64 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 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/>.
+*/
+
+/**
+ * @file registry.h
+ * @brief Threads registry macros and structures.
+ * @addtogroup registry
+ * @{
+ */
+
+#ifndef _REGISTRY_H_
+#define _REGISTRY_H_
+
+#if CH_USE_REGISTRY
+
+/**
+ * @brief   Removes a thread from the registry list.
+ * @note    This macro is not meant for use in application code.
+ */
+#define REG_REMOVE(tp) {                                                    \
+  (tp)->p_older->p_newer = (tp)->p_newer;                                   \
+  (tp)->p_newer->p_older = (tp)->p_older;                                   \
+}
+
+/**
+ * @brief   Adds a thread to the registry list.
+ * @note    This macro is not meant for use in application code.
+ */
+#define REG_INSERT(tp) {                                                    \
+  (tp)->p_newer = (Thread *)&rlist;                                         \
+  (tp)->p_older = rlist.p_older;                                            \
+  (tp)->p_older->p_newer = rlist.p_older = (tp);                            \
+}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  Thread *chRegFirstThread(void);
+  Thread *chRegNextThread(Thread *tp);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CH_USE_REGISTRY */
+
+#endif /* _REGISTRY_H_ */
+
+/** @} */

os/kernel/src/chregistry.c

@@ -0,0 +1,77 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 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/>.
+*/
+
+/**
+ * @file chregistry.c
+ * @brief Threads registry code.
+ * @addtogroup registry
+ * @{
+ */
+#include "ch.h"
+
+#if CH_USE_REGISTRY
+
+/**
+ * @brief   Returns the first thread in the system.
+ * @details Returns the most ancient thread in the system, usually this is
+ *          the main thread unless it terminated.
+ * @note    A reference is added to the returned thread in order to make sure
+ *          it status is not lost.
+ *
+ * @return  A reference to the first thread.
+ */
+Thread *chRegFirstThread(void) {
+  Thread *tp;
+
+  chSysLock();
+  (tp = rlist.p_newer)->p_refs++;
+  chSysUnlock();
+  return tp;
+}
+
+/**
+ * @brief   Returns the thread next to the specified one.
+ * @details The reference counter of the specified thread is decremented and
+ *          the reference counter of the returned thread is incremented.
+ *
+ * @param[in] tp    pointer to the thread
+ * @return  A reference to the next thread.
+ * @retval  NULL if there is no next thread.
+ */
+Thread *chRegNextThread(Thread *tp) {
+
+  chSysLock();
+  chDbgAssert(tp->p_refs > 0, "chRegNextThread(), #1",
+              "not referenced");
+  tp->p_refs--;
+  if (tp->p_newer != (Thread *)&rlist) {
+    tp = tp->p_newer;
+    chDbgAssert(tp->p_refs < 255, "chRegNextThread(), #2",
+                "too many references");
+    tp->p_refs++;
+  }
+  else
+    tp = NULL;
+  chSysUnlock();
+  return tp;
+}
+
+#endif /* CH_USE_REGISTRY */
+
+/** @} */

readme.txt

@@ -55,7 +55,7 @@
 - FIX: Fixed wrong notes on function chThdResume() (bug 2943160).
 - NEW: Implemented the concept of thread references, this mechanism ensures
   that a dynamic thread's memory is not freed while some other thread still
-  owns a pointer to the thread. Static threads are not affected by the new
+  owns a reference to the thread. Static threads are not affected by the new
   mechanism. Two new APIs have been added: chThdAddRef() and chThdRelease().
 - NEW: Not more than one thread can be waiting in chThdWait() as long they
   own a reference.