1 files changed, 82 insertions, 0 deletions
diff --git a/src/include/semaphores.h b/src/include/semaphores.h
new file mode 100644
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--- /dev/null
+++ b/src/include/semaphores.h
@@ -0,0 +1,82 @@
+/*
+    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/>.
+*/
+
+/**
+ * @addtogroup Semaphores
+ * @{
+ */
+
+#ifndef _SEMAPHORES_H_
+#define _SEMAPHORES_H_
+
+#ifdef CH_USE_SEMAPHORES
+
+/**
+ * Semaphore structure.
+ */
+typedef struct {
+  /** Queue of the threads sleeping on this Semaphore.*/
+  ThreadsQueue    s_queue;
+  /** The Semaphore counter.*/
+  t_semcnt        s_cnt;
+} Semaphore;
+
+void chSemInit(Semaphore *sp, t_semcnt n);
+void chSemReset(Semaphore *sp, t_semcnt n);
+void chSemResetI(Semaphore *sp, t_semcnt n);
+void chSemWait(Semaphore *sp);
+void chSemWaitS(Semaphore *sp);
+t_msg chSemWaitTimeout(Semaphore *sp, t_time time);
+t_msg chSemWaitTimeoutS(Semaphore *sp, t_time time);
+void chSemSignal(Semaphore *sp);
+void chSemSignalI(Semaphore *sp);
+void chSignalWait(Semaphore *sps, Semaphore *spw);
+
+#ifdef CH_USE_RT_SEMAPHORES
+void chSemRaisePrioWait(Semaphore *sp);
+void chSemLowerPrioSignal(Semaphore *sp);
+void chSemRaisePrioSignalWait(Semaphore *sps, Semaphore *spw);
+void chSemLowerPrioSignalWait(Semaphore *sps, Semaphore *spw);
+#endif
+
+/**
+ * Decreases the semaphore counter, this macro can be used when it is ensured
+ * that the counter would not become negative.
+ */
+#define chSemFastWaitS(sp) \
+				((sp)->s_cnt--)
+
+/**
+ * Increases the semaphore counter, this macro can be used when the counter is
+ * not negative.
+ */
+#define chSemFastSignalI(sp) \
+				((sp)->s_cnt++)
+
+/**
+ * Returns the semaphore counter current value.
+ */
+#define chSemGetCounter(sp) \
+				((sp)->s_cnt)
+
+#endif /* CH_USE_SEMAPHORES */
+
+#endif /* _SEM_H_ */
+
+/** @} */