mirror of https://github.com/grpc/grpc.git
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <grpc/support/log.h> |
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#include <grpc/support/time.h> |
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#include <stdio.h> |
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#ifdef GRPC_TIMERS_RDTSC |
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#if defined(__i386__) |
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static void gpr_get_cycle_counter(long long int *clk) { |
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long long int ret; |
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__asm__ volatile("rdtsc" : "=A"(ret)); |
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*clk = ret; |
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} |
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// ----------------------------------------------------------------
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#elif defined(__x86_64__) || defined(__amd64__) |
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static void gpr_get_cycle_counter(long long int *clk) { |
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unsigned long long low, high; |
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__asm__ volatile("rdtsc" : "=a"(low), "=d"(high)); |
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*clk = (long long)(high << 32) | (long long)low; |
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} |
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#endif |
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static double cycles_per_second = 0; |
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static long long int start_cycle; |
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void gpr_precise_clock_init(void) { |
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time_t start; |
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long long end_cycle; |
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gpr_log(GPR_DEBUG, "Calibrating timers"); |
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start = time(NULL); |
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while (time(NULL) == start) |
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; |
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gpr_get_cycle_counter(&start_cycle); |
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while (time(NULL) <= start + 10) |
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; |
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gpr_get_cycle_counter(&end_cycle); |
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cycles_per_second = (double)(end_cycle - start_cycle) / 10.0; |
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gpr_log(GPR_DEBUG, "... cycles_per_second = %f\n", cycles_per_second); |
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} |
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void gpr_precise_clock_now(gpr_timespec *clk) { |
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long long int counter; |
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double secs; |
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gpr_get_cycle_counter(&counter); |
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secs = (double)(counter - start_cycle) / cycles_per_second; |
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clk->clock_type = GPR_CLOCK_PRECISE; |
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clk->tv_sec = (time_t)secs; |
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clk->tv_nsec = (int)(1e9 * (secs - (double)clk->tv_sec)); |
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} |
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#else /* GRPC_TIMERS_RDTSC */ |
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void gpr_precise_clock_init(void) {} |
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void gpr_precise_clock_now(gpr_timespec *clk) { |
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*clk = gpr_now(GPR_CLOCK_REALTIME); |
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clk->clock_type = GPR_CLOCK_PRECISE; |
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} |
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#endif /* GRPC_TIMERS_RDTSC */ |
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