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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef _THRIFT_CONCURRENCY_UTIL_H_
+#define _THRIFT_CONCURRENCY_UTIL_H_ 1
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <time.h>
+#include <sys/time.h>
+
+namespace apache { namespace thrift { namespace concurrency {
+
+/**
+ * Utility methods
+ *
+ * This class contains basic utility methods for converting time formats,
+ * and other common platform-dependent concurrency operations.
+ * It should not be included in API headers for other concurrency library
+ * headers, since it will, by definition, pull in all sorts of horrid
+ * platform dependent crap.  Rather it should be inluded directly in
+ * concurrency library implementation source.
+ *
+ * @version $Id:$
+ */
+class Util {
+
+  static const int64_t NS_PER_S = 1000000000LL;
+  static const int64_t US_PER_S = 1000000LL;
+  static const int64_t MS_PER_S = 1000LL;
+
+  static const int64_t NS_PER_MS = NS_PER_S / MS_PER_S;
+  static const int64_t US_PER_MS = US_PER_S / MS_PER_S;
+
+ public:
+
+  /**
+   * Converts millisecond timestamp into a timespec struct
+   *
+   * @param struct timespec& result
+   * @param time or duration in milliseconds
+   */
+  static void toTimespec(struct timespec& result, int64_t value) {
+    result.tv_sec = value / MS_PER_S; // ms to s
+    result.tv_nsec = (value % MS_PER_S) * NS_PER_MS; // ms to ns
+  }
+
+  static void toTimeval(struct timeval& result, int64_t value) {
+    result.tv_sec = value / MS_PER_S; // ms to s
+    result.tv_usec = (value % MS_PER_S) * US_PER_MS; // ms to us
+  }
+
+  /**
+   * Converts struct timespec to milliseconds
+   */
+  static const void toMilliseconds(int64_t& result, const struct timespec& value) {
+    result = (value.tv_sec * MS_PER_S) + (value.tv_nsec / NS_PER_MS);
+    // round up -- int64_t cast is to avoid a compiler error for some GCCs
+    if (int64_t(value.tv_nsec) % NS_PER_MS >= (NS_PER_MS / 2)) {
+      ++result;
+    }
+  }
+
+  /**
+   * Converts struct timeval to milliseconds
+   */
+  static const void toMilliseconds(int64_t& result, const struct timeval& value) {
+    result = (value.tv_sec * MS_PER_S) + (value.tv_usec / US_PER_MS);
+    // round up -- int64_t cast is to avoid a compiler error for some GCCs
+    if (int64_t(value.tv_usec) % US_PER_MS >= (US_PER_MS / 2)) {
+      ++result;
+    }
+  }
+
+  /**
+   * Get current time as milliseconds from epoch
+   */
+  static const int64_t currentTime();
+};
+
+}}} // apache::thrift::concurrency
+
+#endif // #ifndef _THRIFT_CONCURRENCY_UTIL_H_