1 /* 2 * 3 * Copyright 2015 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19 /* Win32 code for gpr time support. */ 20 21 #include <grpc/support/port_platform.h> 22 23 #ifdef GPR_WINDOWS_TIME 24 25 #include <grpc/support/log.h> 26 #include <grpc/support/time.h> 27 #include <limits.h> 28 #include <process.h> 29 #include <sys/timeb.h> 30 31 #include "src/core/lib/gpr/time_precise.h" 32 33 static LARGE_INTEGER g_start_time; 34 static double g_time_scale; 35 gpr_time_init(void)36void gpr_time_init(void) { 37 LARGE_INTEGER frequency; 38 QueryPerformanceFrequency(&frequency); 39 QueryPerformanceCounter(&g_start_time); 40 g_time_scale = 1.0 / (double)frequency.QuadPart; 41 } 42 now_impl(gpr_clock_type clock)43static gpr_timespec now_impl(gpr_clock_type clock) { 44 gpr_timespec now_tv; 45 LONGLONG diff; 46 struct _timeb now_tb; 47 LARGE_INTEGER timestamp; 48 double now_dbl; 49 now_tv.clock_type = clock; 50 switch (clock) { 51 case GPR_CLOCK_REALTIME: 52 _ftime_s(&now_tb); 53 now_tv.tv_sec = (int64_t)now_tb.time; 54 now_tv.tv_nsec = now_tb.millitm * 1000000; 55 break; 56 case GPR_CLOCK_MONOTONIC: 57 case GPR_CLOCK_PRECISE: 58 QueryPerformanceCounter(×tamp); 59 diff = timestamp.QuadPart - g_start_time.QuadPart; 60 now_dbl = (double)diff * g_time_scale; 61 now_tv.tv_sec = (int64_t)now_dbl; 62 now_tv.tv_nsec = (int32_t)((now_dbl - (double)now_tv.tv_sec) * 1e9); 63 break; 64 case GPR_TIMESPAN: 65 abort(); 66 break; 67 } 68 return now_tv; 69 } 70 71 gpr_timespec (*gpr_now_impl)(gpr_clock_type clock_type) = now_impl; 72 gpr_now(gpr_clock_type clock_type)73gpr_timespec gpr_now(gpr_clock_type clock_type) { 74 return gpr_now_impl(clock_type); 75 } 76 gpr_sleep_until(gpr_timespec until)77void gpr_sleep_until(gpr_timespec until) { 78 gpr_timespec now; 79 gpr_timespec delta; 80 int64_t sleep_millis; 81 82 for (;;) { 83 /* We could simplify by using clock_nanosleep instead, but it might be 84 * slightly less portable. */ 85 now = gpr_now(until.clock_type); 86 if (gpr_time_cmp(until, now) <= 0) { 87 return; 88 } 89 90 delta = gpr_time_sub(until, now); 91 sleep_millis = 92 delta.tv_sec * GPR_MS_PER_SEC + delta.tv_nsec / GPR_NS_PER_MS; 93 GPR_ASSERT((sleep_millis >= 0) && (sleep_millis <= INT_MAX)); 94 Sleep((DWORD)sleep_millis); 95 } 96 } 97 98 #endif /* GPR_WINDOWS_TIME */ 99