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@ -31,65 +31,63 @@ |
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* |
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*/ |
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#ifndef GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H |
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#define GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H |
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#ifndef GRPC_CORE_SUPPORT_TIME_PRECISE_H_ |
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#define GRPC_CORE_SUPPORT_TIME_PRECISE_H_ |
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#include <grpc/support/sync.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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typedef long long int grpc_precise_clock; |
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#if defined(__i386__) |
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static void grpc_precise_clock_now(grpc_precise_clock *clk) { |
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grpc_precise_clock ret; |
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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 grpc_precise_clock_now(grpc_precise_clock *clk) { |
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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 = (high << 32) | low; |
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} |
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#endif |
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static gpr_once precise_clock_init = GPR_ONCE_INIT; |
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static double cycles_per_second = 0.0; |
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static void grpc_precise_clock_init() { |
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static long long cycles_per_second = 0; |
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static void gpr_precise_clock_init() { |
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time_t start = time(NULL); |
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grpc_precise_clock start_time; |
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grpc_precise_clock end_time; |
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gpr_precise_clock start_cycle; |
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gpr_precise_clock end_cycle; |
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while (time(NULL) == start) |
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; |
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grpc_precise_clock_now(&start_time); |
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gpr_get_cycle_counter(&start_cycle); |
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while (time(NULL) == start + 1) |
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; |
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grpc_precise_clock_now(&end_time); |
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cycles_per_second = end_time - start_time; |
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gpr_get_cycle_counter(&end_cycle); |
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cycles_per_second = end_cycle - start_cycle; |
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} |
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static double grpc_precise_clock_scaling_factor() { |
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gpr_once_init(&precise_clock_init, grpc_precise_clock_init); |
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return 1e6 / cycles_per_second; |
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} |
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#define GRPC_PRECISE_CLOCK_FORMAT "%f" |
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#define GRPC_PRECISE_CLOCK_PRINTF_ARGS(clk) \ |
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(*(clk)*grpc_precise_clock_scaling_factor()) |
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#else |
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typedef struct grpc_precise_clock grpc_precise_clock; |
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struct grpc_precise_clock { |
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gpr_timespec clock; |
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}; |
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static void grpc_precise_clock_now(grpc_precise_clock* clk) { |
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clk->clock = gpr_now(GPR_CLOCK_REALTIME); |
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static void gpr_precise_clock_now(gpr_timespec *clk) { |
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long long int counter; |
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gpr_get_cycle_counter(&counter); |
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clk->clock = GPR_CLOCK_REALTIME; |
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clk->tv_sec = counter / cycles_per_second; |
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clk->tv_nsec = counter % cycles_per_second; |
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} |
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#define GRPC_PRECISE_CLOCK_FORMAT "%ld.%09d" |
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#define GRPC_PRECISE_CLOCK_PRINTF_ARGS(clk) \ |
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(clk)->clock.tv_sec, (clk)->clock.tv_nsec |
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static void grpc_precise_clock_print(const grpc_precise_clock* clk, FILE* fp) { |
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fprintf(fp, "%ld.%09d", clk->clock.tv_sec, clk->clock.tv_nsec); |
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#else /* GRPC_TIMERS_RDTSC */ |
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static 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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#endif /* GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H */ |
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#endif /* GRPC_CORE_SUPPORT_TIME_PRECISE_ */ |
Craig Tiller
10 years ago