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diff --git a/src/core/lib/support/time.c b/src/core/lib/support/time.c
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+/*
+ *
+ * Copyright 2015, 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/log.h>
+#include <grpc/support/time.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.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)));
+}
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