| /* |
| * |
| * Copyright 2015-2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| /* Generic implementation of time calls. */ |
| |
| #include <grpc/support/time.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <grpc/support/log.h> |
| |
| int gpr_time_cmp(gpr_timespec a, gpr_timespec b) { |
| int cmp = (a.tv_sec > b.tv_sec) - (a.tv_sec < b.tv_sec); |
| GPR_ASSERT(a.clock_type == b.clock_type); |
| if (cmp == 0) { |
| cmp = (a.tv_nsec > b.tv_nsec) - (a.tv_nsec < b.tv_nsec); |
| } |
| return cmp; |
| } |
| |
| gpr_timespec gpr_time_min(gpr_timespec a, gpr_timespec b) { |
| return gpr_time_cmp(a, b) < 0 ? a : b; |
| } |
| |
| gpr_timespec gpr_time_max(gpr_timespec a, gpr_timespec b) { |
| return gpr_time_cmp(a, b) > 0 ? a : b; |
| } |
| |
| gpr_timespec gpr_time_0(gpr_clock_type type) { |
| gpr_timespec out; |
| out.tv_sec = 0; |
| out.tv_nsec = 0; |
| out.clock_type = type; |
| return out; |
| } |
| |
| gpr_timespec gpr_inf_future(gpr_clock_type type) { |
| gpr_timespec out; |
| out.tv_sec = INT64_MAX; |
| out.tv_nsec = 0; |
| out.clock_type = type; |
| return out; |
| } |
| |
| gpr_timespec gpr_inf_past(gpr_clock_type type) { |
| gpr_timespec out; |
| out.tv_sec = INT64_MIN; |
| out.tv_nsec = 0; |
| out.clock_type = type; |
| return out; |
| } |
| |
| /* TODO(ctiller): consider merging _nanos, _micros, _millis into a single |
| function for maintainability. Similarly for _seconds, _minutes, and _hours */ |
| |
| gpr_timespec gpr_time_from_nanos(int64_t ns, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (ns == INT64_MAX) { |
| result = gpr_inf_future(type); |
| } else if (ns == INT64_MIN) { |
| result = gpr_inf_past(type); |
| } else if (ns >= 0) { |
| result.tv_sec = ns / GPR_NS_PER_SEC; |
| result.tv_nsec = (int32_t)(ns - result.tv_sec * GPR_NS_PER_SEC); |
| } else { |
| /* Calculation carefully formulated to avoid any possible under/overflow. */ |
| result.tv_sec = (-(999999999 - (ns + GPR_NS_PER_SEC)) / GPR_NS_PER_SEC) - 1; |
| result.tv_nsec = (int32_t)(ns - result.tv_sec * GPR_NS_PER_SEC); |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_from_micros(int64_t us, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (us == INT64_MAX) { |
| result = gpr_inf_future(type); |
| } else if (us == INT64_MIN) { |
| result = gpr_inf_past(type); |
| } else if (us >= 0) { |
| result.tv_sec = us / 1000000; |
| result.tv_nsec = (int32_t)((us - result.tv_sec * 1000000) * 1000); |
| } else { |
| /* Calculation carefully formulated to avoid any possible under/overflow. */ |
| result.tv_sec = (-(999999 - (us + 1000000)) / 1000000) - 1; |
| result.tv_nsec = (int32_t)((us - result.tv_sec * 1000000) * 1000); |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_from_millis(int64_t ms, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (ms == INT64_MAX) { |
| result = gpr_inf_future(type); |
| } else if (ms == INT64_MIN) { |
| result = gpr_inf_past(type); |
| } else if (ms >= 0) { |
| result.tv_sec = ms / 1000; |
| result.tv_nsec = (int32_t)((ms - result.tv_sec * 1000) * 1000000); |
| } else { |
| /* Calculation carefully formulated to avoid any possible under/overflow. */ |
| result.tv_sec = (-(999 - (ms + 1000)) / 1000) - 1; |
| result.tv_nsec = (int32_t)((ms - result.tv_sec * 1000) * 1000000); |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_from_seconds(int64_t s, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (s == INT64_MAX) { |
| result = gpr_inf_future(type); |
| } else if (s == INT64_MIN) { |
| result = gpr_inf_past(type); |
| } else { |
| result.tv_sec = s; |
| result.tv_nsec = 0; |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_from_minutes(int64_t m, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (m >= INT64_MAX / 60) { |
| result = gpr_inf_future(type); |
| } else if (m <= INT64_MIN / 60) { |
| result = gpr_inf_past(type); |
| } else { |
| result.tv_sec = m * 60; |
| result.tv_nsec = 0; |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_from_hours(int64_t h, gpr_clock_type type) { |
| gpr_timespec result; |
| result.clock_type = type; |
| if (h >= INT64_MAX / 3600) { |
| result = gpr_inf_future(type); |
| } else if (h <= INT64_MIN / 3600) { |
| result = gpr_inf_past(type); |
| } else { |
| result.tv_sec = h * 3600; |
| result.tv_nsec = 0; |
| } |
| return result; |
| } |
| |
| gpr_timespec gpr_time_add(gpr_timespec a, gpr_timespec b) { |
| gpr_timespec sum; |
| int64_t inc = 0; |
| GPR_ASSERT(b.clock_type == GPR_TIMESPAN); |
| sum.clock_type = a.clock_type; |
| sum.tv_nsec = a.tv_nsec + b.tv_nsec; |
| if (sum.tv_nsec >= GPR_NS_PER_SEC) { |
| sum.tv_nsec -= GPR_NS_PER_SEC; |
| inc++; |
| } |
| if (a.tv_sec == INT64_MAX || a.tv_sec == INT64_MIN) { |
| sum = a; |
| } else if (b.tv_sec == INT64_MAX || |
| (b.tv_sec >= 0 && a.tv_sec >= INT64_MAX - b.tv_sec)) { |
| sum = gpr_inf_future(sum.clock_type); |
| } else if (b.tv_sec == INT64_MIN || |
| (b.tv_sec <= 0 && a.tv_sec <= INT64_MIN - b.tv_sec)) { |
| sum = gpr_inf_past(sum.clock_type); |
| } else { |
| sum.tv_sec = a.tv_sec + b.tv_sec; |
| if (inc != 0 && sum.tv_sec == INT64_MAX - 1) { |
| sum = gpr_inf_future(sum.clock_type); |
| } else { |
| sum.tv_sec += inc; |
| } |
| } |
| return sum; |
| } |
| |
| gpr_timespec gpr_time_sub(gpr_timespec a, gpr_timespec b) { |
| gpr_timespec diff; |
| int64_t dec = 0; |
| if (b.clock_type == GPR_TIMESPAN) { |
| diff.clock_type = a.clock_type; |
| } else { |
| GPR_ASSERT(a.clock_type == b.clock_type); |
| diff.clock_type = GPR_TIMESPAN; |
| } |
| diff.tv_nsec = a.tv_nsec - b.tv_nsec; |
| if (diff.tv_nsec < 0) { |
| diff.tv_nsec += GPR_NS_PER_SEC; |
| dec++; |
| } |
| if (a.tv_sec == INT64_MAX || a.tv_sec == INT64_MIN) { |
| diff = a; |
| } else if (b.tv_sec == INT64_MIN || |
| (b.tv_sec <= 0 && a.tv_sec >= INT64_MAX + b.tv_sec)) { |
| diff = gpr_inf_future(GPR_CLOCK_REALTIME); |
| } else if (b.tv_sec == INT64_MAX || |
| (b.tv_sec >= 0 && a.tv_sec <= INT64_MIN + b.tv_sec)) { |
| diff = gpr_inf_past(GPR_CLOCK_REALTIME); |
| } else { |
| diff.tv_sec = a.tv_sec - b.tv_sec; |
| if (dec != 0 && diff.tv_sec == INT64_MIN + 1) { |
| diff = gpr_inf_past(GPR_CLOCK_REALTIME); |
| } else { |
| diff.tv_sec -= dec; |
| } |
| } |
| return diff; |
| } |
| |
| int gpr_time_similar(gpr_timespec a, gpr_timespec b, gpr_timespec threshold) { |
| int cmp_ab; |
| |
| GPR_ASSERT(a.clock_type == b.clock_type); |
| GPR_ASSERT(threshold.clock_type == GPR_TIMESPAN); |
| |
| cmp_ab = gpr_time_cmp(a, b); |
| if (cmp_ab == 0) return 1; |
| if (cmp_ab < 0) { |
| return gpr_time_cmp(gpr_time_sub(b, a), threshold) <= 0; |
| } else { |
| return gpr_time_cmp(gpr_time_sub(a, b), threshold) <= 0; |
| } |
| } |
| |
| int32_t gpr_time_to_millis(gpr_timespec t) { |
| if (t.tv_sec >= 2147483) { |
| if (t.tv_sec == 2147483 && t.tv_nsec < 648 * GPR_NS_PER_MS) { |
| return 2147483 * GPR_MS_PER_SEC + t.tv_nsec / GPR_NS_PER_MS; |
| } |
| return 2147483647; |
| } else if (t.tv_sec <= -2147483) { |
| /* TODO(ctiller): correct handling here (it's so far in the past do we |
| care?) */ |
| return -2147483647; |
| } else { |
| return (int32_t)(t.tv_sec * GPR_MS_PER_SEC + t.tv_nsec / GPR_NS_PER_MS); |
| } |
| } |
| |
| double gpr_timespec_to_micros(gpr_timespec t) { |
| return (double)t.tv_sec * GPR_US_PER_SEC + t.tv_nsec * 1e-3; |
| } |
| |
| gpr_timespec gpr_convert_clock_type(gpr_timespec t, gpr_clock_type clock_type) { |
| if (t.clock_type == clock_type) { |
| return t; |
| } |
| |
| if (t.tv_nsec == 0) { |
| if (t.tv_sec == INT64_MAX) { |
| t.clock_type = clock_type; |
| return t; |
| } |
| if (t.tv_sec == INT64_MIN) { |
| t.clock_type = clock_type; |
| return t; |
| } |
| } |
| |
| if (clock_type == GPR_TIMESPAN) { |
| return gpr_time_sub(t, gpr_now(t.clock_type)); |
| } |
| |
| if (t.clock_type == GPR_TIMESPAN) { |
| return gpr_time_add(gpr_now(clock_type), t); |
| } |
| |
| return gpr_time_add(gpr_now(clock_type), |
| gpr_time_sub(t, gpr_now(t.clock_type))); |
| } |