arm_compute v17.09
Change-Id: I4bf8f4e6e5f84ce0d5b6f5ba570d276879f42a81
diff --git a/support/Semaphore.h b/support/Semaphore.h
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+/*
+ * 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__ */