From ca20fd81f6f5cba290763cf08243f582841cf770 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Tue, 2 Feb 2010 21:27:53 +0000
Subject: Forgot files...

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1560 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/kernel/src/chregistry.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 os/kernel/src/chregistry.c

(limited to 'os/kernel/src')

diff --git a/os/kernel/src/chregistry.c b/os/kernel/src/chregistry.c
new file mode 100644
index 000000000..186d97e35
--- /dev/null
+++ b/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 */
+
+/** @} */
-- 
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