From baf174e85ddb5399355281cd34d0f459d92124a7 Mon Sep 17 00:00:00 2001
From: Georgios Pinitas <georgios.pinitas@arm.com>
Date: Fri, 8 Sep 2017 19:47:30 +0100
Subject: COMPMID-485: Memory Manager

Change-Id: Ib421b7622838f050038cd81e7426bb1413a7d6e6
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/87376
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
---
 support/Semaphore.h | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 support/Semaphore.h

(limited to 'support')

diff --git a/support/Semaphore.h b/support/Semaphore.h
new file mode 100644
index 0000000000..6cdf196dee
--- /dev/null
+++ b/support/Semaphore.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
+#define __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
+
+#include "Mutex.h"
+#include "support/Mutex.h"
+#include <condition_variable>
+
+namespace arm_compute
+{
+#ifndef NO_MULTI_THREADING
+/** Semamphore class */
+class Semaphore
+{
+public:
+    /** Default Constuctor
+     *
+     * @param[in] value Semaphore initial value
+     */
+    Semaphore(int value = 0)
+        : _value(value), _m(), _cv()
+    {
+    }
+    /** Signals a semaphore */
+    inline void signal()
+    {
+        std::unique_lock<std::mutex> lock(_m);
+        ++_value;
+        _cv.notify_one();
+    }
+    /** Waits on a semaphore */
+    inline void wait()
+    {
+        std::unique_lock<std::mutex> lock(_m);
+        _cv.wait(lock, [this]()
+        {
+            return _value > 0;
+        });
+        --_value;
+    }
+
+private:
+    int                     _value;
+    arm_compute::Mutex      _m;
+    std::condition_variable _cv;
+};
+#else  /* NO_MULTI_THREADING */
+/** Empty semamphore class */
+class Semaphore
+{
+public:
+    Semaphore(int value = 0)
+        : _value(value)
+    {
+    }
+    /** Signals a semaphore */
+    inline void signal()
+    {
+    }
+    /** Waits on a semaphore */
+    inline void wait()
+    {
+    }
+
+private:
+    int _value;
+};
+#endif /* NO_MULTI_THREADING */
+} // arm_compute
+#endif /* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */
-- 
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