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+/******************************************************************************
+ * Copyright (c) 2011, Duane Merrill. All rights reserved.
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of the NVIDIA CORPORATION nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************/
+
+/**
+ * \file
+ * Simple portable mutex
+ */
+
+
+#pragma once
+
+#if (__cplusplus > 199711L) || (defined(_MSC_VER) && _MSC_VER >= 1800)
+ #include <mutex>
+#else
+ #if defined(_WIN32) || defined(_WIN64)
+ #include <intrin.h>
+
+ #define WIN32_LEAN_AND_MEAN
+ #define NOMINMAX
+ #include <windows.h>
+ #undef WIN32_LEAN_AND_MEAN
+ #undef NOMINMAX
+
+ /**
+ * Compiler read/write barrier
+ */
+ #pragma intrinsic(_ReadWriteBarrier)
+
+ #endif
+#endif
+
+#include "../util_namespace.cuh"
+
+
+/// Optional outer namespace(s)
+CUB_NS_PREFIX
+
+/// CUB namespace
+namespace cub {
+
+
+/**
+ * Simple portable mutex
+ * - Wraps std::mutex when compiled with C++11 or newer (supported on all platforms)
+ * - Uses GNU/Windows spinlock mechanisms for pre C++11 (supported on x86/x64 when compiled with cl.exe or g++)
+ */
+struct Mutex
+{
+#if (__cplusplus > 199711L) || (defined(_MSC_VER) && _MSC_VER >= 1800)
+
+ std::mutex mtx;
+
+ void Lock()
+ {
+ mtx.lock();
+ }
+
+ void Unlock()
+ {
+ mtx.unlock();
+ }
+
+ void TryLock()
+ {
+ mtx.try_lock();
+ }
+
+#else //__cplusplus > 199711L
+
+ #if defined(_MSC_VER)
+
+ // Microsoft VC++
+ typedef long Spinlock;
+
+ #else
+
+ // GNU g++
+ typedef int Spinlock;
+
+ /**
+ * Compiler read/write barrier
+ */
+ __forceinline__ void _ReadWriteBarrier()
+ {
+ __sync_synchronize();
+ }
+
+ /**
+ * Atomic exchange
+ */
+ __forceinline__ long _InterlockedExchange(volatile int * const Target, const int Value)
+ {
+ // NOTE: __sync_lock_test_and_set would be an acquire barrier, so we force a full barrier
+ _ReadWriteBarrier();
+ return __sync_lock_test_and_set(Target, Value);
+ }
+
+ /**
+ * Pause instruction to prevent excess processor bus usage
+ */
+ __forceinline__ void YieldProcessor()
+ {
+ }
+
+ #endif // defined(_MSC_VER)
+
+ /// Lock member
+ volatile Spinlock lock;
+
+ /**
+ * Constructor
+ */
+ Mutex() : lock(0) {}
+
+ /**
+ * Return when the specified spinlock has been acquired
+ */
+ __forceinline__ void Lock()
+ {
+ while (1)
+ {
+ if (!_InterlockedExchange(&lock, 1)) return;
+ while (lock) YieldProcessor();
+ }
+ }
+
+
+ /**
+ * Release the specified spinlock
+ */
+ __forceinline__ void Unlock()
+ {
+ _ReadWriteBarrier();
+ lock = 0;
+ }
+
+#endif // __cplusplus > 199711L
+
+};
+
+
+
+
+} // CUB namespace
+CUB_NS_POSTFIX // Optional outer namespace(s)
+