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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.
*
*/
#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
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 */
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