--- /dev/null
+/*
+ *
+ * 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/gpr/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 = static_cast<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 = static_cast<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(...) function may return with a value whose tv_usec is
+ // greater than 1e6 on iOS The case is resolved with the guard at end of
+ // this function.
+ gettimeofday(&now_tv, nullptr);
+ 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();
+ }
+
+ // Guard the tv_nsec field in valid range for all clock types
+ while (GPR_UNLIKELY(now.tv_nsec >= 1e9)) {
+ now.tv_sec++;
+ now.tv_nsec -= 1e9;
+ }
+ while (GPR_UNLIKELY(now.tv_nsec < 0)) {
+ now.tv_sec--;
+ now.tv_nsec += 1e9;
+ }
+
+ return now;
+}
+#endif
+
+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
+ // validate clock type
+ GPR_ASSERT(clock_type == GPR_CLOCK_MONOTONIC ||
+ clock_type == GPR_CLOCK_REALTIME ||
+ clock_type == GPR_CLOCK_PRECISE);
+ gpr_timespec ts = gpr_now_impl(clock_type);
+ // tv_nsecs must be in the range [0, 1e9).
+ GPR_ASSERT(ts.tv_nsec >= 0 && ts.tv_nsec < 1e9);
+ return ts;
+}
+
+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, nullptr);
+ if (ns_result == 0) {
+ break;
+ }
+ }
+}
+
+#endif /* GPR_POSIX_TIME */
git://repos.xcallymotion.com / motion2.git / blobdiff