| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #include <grpc/support/port_platform.h> |
| #include "src/core/lib/support/time_precise.h" |
| |
| #ifdef GPR_POSIX_TIME |
| |
| #include <stdlib.h> |
| #include <time.h> |
| #include <unistd.h> |
| #ifdef __linux__ |
| #include <sys/syscall.h> |
| #endif |
| #include <grpc/support/atm.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/time.h> |
| |
| static struct timespec timespec_from_gpr(gpr_timespec gts) { |
| struct timespec rv; |
| if (sizeof(time_t) < sizeof(int64_t)) { |
| /* fine to assert, as this is only used in gpr_sleep_until */ |
| GPR_ASSERT(gts.tv_sec <= INT32_MAX && gts.tv_sec >= INT32_MIN); |
| } |
| rv.tv_sec = (time_t)gts.tv_sec; |
| rv.tv_nsec = gts.tv_nsec; |
| return rv; |
| } |
| |
| #if _POSIX_TIMERS > 0 || defined(__OpenBSD__) |
| static gpr_timespec gpr_from_timespec(struct timespec ts, |
| gpr_clock_type clock_type) { |
| /* |
| * timespec.tv_sec can have smaller size than gpr_timespec.tv_sec, |
| * but we are only using this function to implement gpr_now |
| * so there's no need to handle "infinity" values. |
| */ |
| gpr_timespec rv; |
| rv.tv_sec = ts.tv_sec; |
| rv.tv_nsec = (int32_t)ts.tv_nsec; |
| rv.clock_type = clock_type; |
| return rv; |
| } |
| |
| /** maps gpr_clock_type --> clockid_t for clock_gettime */ |
| static const clockid_t clockid_for_gpr_clock[] = {CLOCK_MONOTONIC, |
| CLOCK_REALTIME}; |
| |
| void gpr_time_init(void) { gpr_precise_clock_init(); } |
| |
| static gpr_timespec now_impl(gpr_clock_type clock_type) { |
| struct timespec now; |
| GPR_ASSERT(clock_type != GPR_TIMESPAN); |
| if (clock_type == GPR_CLOCK_PRECISE) { |
| gpr_timespec ret; |
| gpr_precise_clock_now(&ret); |
| return ret; |
| } else { |
| #if defined(GPR_BACKWARDS_COMPATIBILITY_MODE) && defined(__linux__) |
| /* avoid ABI problems by invoking syscalls directly */ |
| syscall(SYS_clock_gettime, clockid_for_gpr_clock[clock_type], &now); |
| #else |
| clock_gettime(clockid_for_gpr_clock[clock_type], &now); |
| #endif |
| return gpr_from_timespec(now, clock_type); |
| } |
| } |
| #else |
| /* For some reason Apple's OSes haven't implemented clock_gettime. */ |
| |
| #include <mach/mach.h> |
| #include <mach/mach_time.h> |
| #include <sys/time.h> |
| |
| static double g_time_scale; |
| static uint64_t g_time_start; |
| |
| void gpr_time_init(void) { |
| mach_timebase_info_data_t tb = {0, 1}; |
| gpr_precise_clock_init(); |
| mach_timebase_info(&tb); |
| g_time_scale = tb.numer; |
| g_time_scale /= tb.denom; |
| g_time_start = mach_absolute_time(); |
| } |
| |
| static gpr_timespec now_impl(gpr_clock_type clock) { |
| gpr_timespec now; |
| struct timeval now_tv; |
| double now_dbl; |
| |
| now.clock_type = clock; |
| switch (clock) { |
| case GPR_CLOCK_REALTIME: |
| gettimeofday(&now_tv, NULL); |
| now.tv_sec = now_tv.tv_sec; |
| now.tv_nsec = now_tv.tv_usec * 1000; |
| break; |
| case GPR_CLOCK_MONOTONIC: |
| now_dbl = ((double)(mach_absolute_time() - g_time_start)) * g_time_scale; |
| now.tv_sec = (int64_t)(now_dbl * 1e-9); |
| now.tv_nsec = (int32_t)(now_dbl - ((double)now.tv_sec) * 1e9); |
| break; |
| case GPR_CLOCK_PRECISE: |
| gpr_precise_clock_now(&now); |
| break; |
| case GPR_TIMESPAN: |
| abort(); |
| } |
| |
| return now; |
| } |
| #endif |
| |
| extern "C" { |
| gpr_timespec (*gpr_now_impl)(gpr_clock_type clock_type) = now_impl; |
| } |
| |
| #ifdef GPR_LOW_LEVEL_COUNTERS |
| gpr_atm gpr_now_call_count; |
| #endif |
| |
| gpr_timespec gpr_now(gpr_clock_type clock_type) { |
| #ifdef GPR_LOW_LEVEL_COUNTERS |
| __atomic_fetch_add(&gpr_now_call_count, 1, __ATOMIC_RELAXED); |
| #endif |
| return gpr_now_impl(clock_type); |
| } |
| |
| void gpr_sleep_until(gpr_timespec until) { |
| gpr_timespec now; |
| gpr_timespec delta; |
| struct timespec delta_ts; |
| int ns_result; |
| |
| for (;;) { |
| /* We could simplify by using clock_nanosleep instead, but it might be |
| * slightly less portable. */ |
| now = gpr_now(until.clock_type); |
| if (gpr_time_cmp(until, now) <= 0) { |
| return; |
| } |
| |
| delta = gpr_time_sub(until, now); |
| delta_ts = timespec_from_gpr(delta); |
| ns_result = nanosleep(&delta_ts, NULL); |
| if (ns_result == 0) { |
| break; |
| } |
| } |
| } |
| |
| #endif /* GPR_POSIX_TIME */ |