Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / src / core / lib / gpr / time_precise.h

diff --git a/legacy-libs/grpc/deps/grpc/src/core/lib/gpr/time_precise.h b/legacy-libs/grpc/deps/grpc/src/core/lib/gpr/time_precise.h
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+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed 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 GRPC_CORE_LIB_GPR_TIME_PRECISE_H
+#define GRPC_CORE_LIB_GPR_TIME_PRECISE_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/impl/codegen/gpr_types.h>
+#include <grpc/support/time.h>
+
+// Depending on the platform gpr_get_cycle_counter() can have a resolution as
+// low as a usec. Use other clock sources or gpr_precise_clock_now(),
+// where you need high resolution clocks.
+//
+// Using gpr_get_cycle_counter() is preferred to using ExecCtx::Get()->Now()
+// whenever possible.
+
+#if GPR_CYCLE_COUNTER_RDTSC_32
+typedef int64_t gpr_cycle_counter;
+inline gpr_cycle_counter gpr_get_cycle_counter() {
+  int64_t ret;
+  __asm__ volatile("rdtsc" : "=A"(ret));
+  return ret;
+}
+#elif GPR_CYCLE_COUNTER_RDTSC_64
+typedef int64_t gpr_cycle_counter;
+inline gpr_cycle_counter gpr_get_cycle_counter() {
+  uint64_t low, high;
+  __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));
+  return (high << 32) | low;
+}
+#elif GPR_CYCLE_COUNTER_FALLBACK
+// TODO(soheil): add support for mrs on Arm.
+
+// Real time in micros.
+typedef double gpr_cycle_counter;
+gpr_cycle_counter gpr_get_cycle_counter();
+#else
+#error Must define exactly one of \
+    GPR_CYCLE_COUNTER_RDTSC_32, \
+    GPR_CYCLE_COUNTER_RDTSC_64, or \
+    GPR_CYCLE_COUNTER_FALLBACK
+#endif
+
+void gpr_precise_clock_init(void);
+void gpr_precise_clock_now(gpr_timespec* clk);
+gpr_timespec gpr_cycle_counter_to_time(gpr_cycle_counter cycles);
+gpr_timespec gpr_cycle_counter_sub(gpr_cycle_counter a, gpr_cycle_counter b);
+
+#endif /* GRPC_CORE_LIB_GPR_TIME_PRECISE_H */