| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef GRPC_SUPPORT_TIME_H |
| #define GRPC_SUPPORT_TIME_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <stddef.h> |
| #include <time.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** The clocks we support. */ |
| typedef enum { |
| /** Monotonic clock. Epoch undefined. Always moves forwards. */ |
| GPR_CLOCK_MONOTONIC = 0, |
| /** Realtime clock. May jump forwards or backwards. Settable by |
| the system administrator. Has its epoch at 0:00:00 UTC 1 Jan 1970. */ |
| GPR_CLOCK_REALTIME, |
| /** CPU cycle time obtained by rdtsc instruction on x86 platforms. Epoch |
| undefined. Degrades to GPR_CLOCK_REALTIME on other platforms. */ |
| GPR_CLOCK_PRECISE, |
| /** Unmeasurable clock type: no base, created by taking the difference |
| between two times */ |
| GPR_TIMESPAN |
| } gpr_clock_type; |
| |
| /** Analogous to struct timespec. On some machines, absolute times may be in |
| * local time. */ |
| typedef struct gpr_timespec { |
| int64_t tv_sec; |
| int32_t tv_nsec; |
| /** Against which clock was this time measured? (or GPR_TIMESPAN if |
| this is a relative time measure) */ |
| gpr_clock_type clock_type; |
| } gpr_timespec; |
| |
| /** Time constants. */ |
| /** The zero time interval. */ |
| GPRAPI gpr_timespec gpr_time_0(gpr_clock_type type); |
| /** The far future */ |
| GPRAPI gpr_timespec gpr_inf_future(gpr_clock_type type); |
| /** The far past. */ |
| GPRAPI gpr_timespec gpr_inf_past(gpr_clock_type type); |
| |
| #define GPR_MS_PER_SEC 1000 |
| #define GPR_US_PER_SEC 1000000 |
| #define GPR_NS_PER_SEC 1000000000 |
| #define GPR_NS_PER_MS 1000000 |
| #define GPR_NS_PER_US 1000 |
| #define GPR_US_PER_MS 1000 |
| |
| /** initialize time subsystem */ |
| GPRAPI void gpr_time_init(void); |
| |
| /** Return the current time measured from the given clocks epoch. */ |
| GPRAPI gpr_timespec gpr_now(gpr_clock_type clock); |
| |
| /** Convert a timespec from one clock to another */ |
| GPRAPI gpr_timespec gpr_convert_clock_type(gpr_timespec t, |
| gpr_clock_type clock_type); |
| |
| /** Return -ve, 0, or +ve according to whether a < b, a == b, or a > b |
| respectively. */ |
| GPRAPI int gpr_time_cmp(gpr_timespec a, gpr_timespec b); |
| |
| GPRAPI gpr_timespec gpr_time_max(gpr_timespec a, gpr_timespec b); |
| GPRAPI gpr_timespec gpr_time_min(gpr_timespec a, gpr_timespec b); |
| |
| /** Add and subtract times. Calculations saturate at infinities. */ |
| GPRAPI gpr_timespec gpr_time_add(gpr_timespec a, gpr_timespec b); |
| GPRAPI gpr_timespec gpr_time_sub(gpr_timespec a, gpr_timespec b); |
| |
| /** Return a timespec representing a given number of time units. INT64_MIN is |
| interpreted as gpr_inf_past, and INT64_MAX as gpr_inf_future. */ |
| GPRAPI gpr_timespec gpr_time_from_micros(int64_t us, gpr_clock_type clock_type); |
| GPRAPI gpr_timespec gpr_time_from_nanos(int64_t ns, gpr_clock_type clock_type); |
| GPRAPI gpr_timespec gpr_time_from_millis(int64_t ms, gpr_clock_type clock_type); |
| GPRAPI gpr_timespec gpr_time_from_seconds(int64_t s, gpr_clock_type clock_type); |
| GPRAPI gpr_timespec gpr_time_from_minutes(int64_t m, gpr_clock_type clock_type); |
| GPRAPI gpr_timespec gpr_time_from_hours(int64_t h, gpr_clock_type clock_type); |
| |
| GPRAPI int32_t gpr_time_to_millis(gpr_timespec timespec); |
| |
| /** Return 1 if two times are equal or within threshold of each other, |
| 0 otherwise */ |
| GPRAPI int gpr_time_similar(gpr_timespec a, gpr_timespec b, |
| gpr_timespec threshold); |
| |
| /** Sleep until at least 'until' - an absolute timeout */ |
| GPRAPI void gpr_sleep_until(gpr_timespec until); |
| |
| GPRAPI double gpr_timespec_to_micros(gpr_timespec t); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* GRPC_SUPPORT_TIME_H */ |