Initial checkin of gRPC to third_party/

third_party/grpc/src/cpp/util/time.cc

+/*
+ *
+ * Copyright 2015, Google Inc.
+ * 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 Google Inc. 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 THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ *
+ */
+
+#include <grpc++/support/config.h>
+
+#ifndef GRPC_CXX0X_NO_CHRONO
+
+#include <grpc/support/time.h>
+#include <grpc++/support/time.h>
+
+using std::chrono::duration_cast;
+using std::chrono::nanoseconds;
+using std::chrono::seconds;
+using std::chrono::system_clock;
+using std::chrono::high_resolution_clock;
+
+namespace grpc {
+
+void Timepoint2Timespec(const system_clock::time_point& from,
+                        gpr_timespec* to) {
+  system_clock::duration deadline = from.time_since_epoch();
+  seconds secs = duration_cast<seconds>(deadline);
+  if (from == system_clock::time_point::max() ||
+      secs.count() >= gpr_inf_future(GPR_CLOCK_REALTIME).tv_sec ||
+      secs.count() < 0) {
+    *to = gpr_inf_future(GPR_CLOCK_REALTIME);
+    return;
+  }
+  nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
+  to->tv_sec = (int64_t)secs.count();
+  to->tv_nsec = (int32_t)nsecs.count();
+  to->clock_type = GPR_CLOCK_REALTIME;
+}
+
+void TimepointHR2Timespec(const high_resolution_clock::time_point& from,
+                          gpr_timespec* to) {
+  high_resolution_clock::duration deadline = from.time_since_epoch();
+  seconds secs = duration_cast<seconds>(deadline);
+  if (from == high_resolution_clock::time_point::max() ||
+      secs.count() >= gpr_inf_future(GPR_CLOCK_REALTIME).tv_sec ||
+      secs.count() < 0) {
+    *to = gpr_inf_future(GPR_CLOCK_REALTIME);
+    return;
+  }
+  nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
+  to->tv_sec = (int64_t)secs.count();
+  to->tv_nsec = (int32_t)nsecs.count();
+  to->clock_type = GPR_CLOCK_REALTIME;
+}
+
+system_clock::time_point Timespec2Timepoint(gpr_timespec t) {
+  if (gpr_time_cmp(t, gpr_inf_future(t.clock_type)) == 0) {
+    return system_clock::time_point::max();
+  }
+  t = gpr_convert_clock_type(t, GPR_CLOCK_REALTIME);
+  system_clock::time_point tp;
+  tp += duration_cast<system_clock::time_point::duration>(seconds(t.tv_sec));
+  tp +=
+      duration_cast<system_clock::time_point::duration>(nanoseconds(t.tv_nsec));
+  return tp;
+}
+
+}  // namespace grpc
+
+#endif  // !GRPC_CXX0X_NO_CHRONO