Transfer files from RAD repository

[ROCm/rocshmem commit: ea8f264a11]
2024-07-01 09:57:08 -05:00
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+/******************************************************************************
+ * Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file notifier.hpp
+ *
+ * @brief Contains the notification memory space for threads to communicate
+ * results with one another.
+ *
+ * Assume one thread does work on behalf of other threads (as a leader) and
+ * that work needs to be communicated to the other threads as a result.
+ * To expose the result, the threads need to share a memory space where the
+ * result can be written. The leader thread writes the result out to this
+ * memory space and all threads synchronize on it.
+ *
+ * This class allows the leader thread to notify other threads of the update.
+ */
+
+#ifndef LIBRARY_SRC_MEMORY_NOTIFIER_HPP_
+#define LIBRARY_SRC_MEMORY_NOTIFIER_HPP_
+
+#include "../device_proxy.hpp"
+#include "../util.hpp"
+
+namespace rocshmem {
+
+class Notifier {
+ public:
+  __device__ uint64_t read() { return value_; }
+
+  __device__ void write(uint64_t val) {
+    if (is_thread_zero_in_block()) {
+      value_ = val;
+    }
+    publish();
+  }
+
+  __device__ void done() { __syncthreads(); }
+
+ private:
+  __device__ void publish() {
+    if (is_thread_zero_in_block()) {
+      __threadfence();
+    }
+    __syncthreads();
+  }
+
+  uint64_t value_{};
+};
+
+template <typename ALLOCATOR>
+class NotifierProxy {
+  using ProxyT = DeviceProxy<ALLOCATOR, Notifier, 1>;
+
+ public:
+  __host__ __device__ Notifier* get() { return proxy_.get(); }
+
+ private:
+  ProxyT proxy_{};
+};
+
+}  // namespace rocshmem
+
+#endif  // LIBRARY_SRC_MEMORY_NOTIFIER_HPP_