mirror of https://github.com/grpc/grpc.git
pull/5844/head
Craig Tiller
9 years ago
parent
80551afb6c
commit
58270d5461
22 changed files with 619 additions and 65 deletions
@ -0,0 +1,71 @@ |
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/*
|
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* |
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* Copyright 2016, Google Inc. |
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* All rights reserved. |
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* |
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* 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. |
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* |
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*/ |
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|
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#include "src/core/support/backoff.h" |
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#include <grpc/support/useful.h> |
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void gpr_backoff_init(gpr_backoff *backoff, double multiplier, double jitter, |
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int64_t min_timeout_millis, int64_t max_timeout_millis) { |
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backoff->multiplier = multiplier; |
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backoff->jitter = jitter; |
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backoff->min_timeout_millis = min_timeout_millis; |
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backoff->max_timeout_millis = max_timeout_millis; |
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backoff->rng_state = (uint32_t)gpr_now(GPR_CLOCK_REALTIME).tv_nsec; |
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} |
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|
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gpr_timespec gpr_backoff_begin(gpr_backoff *backoff, gpr_timespec now) { |
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backoff->current_timeout_millis = backoff->min_timeout_millis; |
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return gpr_time_add( |
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now, gpr_time_from_millis(backoff->current_timeout_millis, GPR_TIMESPAN)); |
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} |
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|
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/* Generate a random number between 0 and 1. */ |
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static double generate_uniform_random_number(uint32_t *rng_state) { |
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*rng_state = (1103515245 * *rng_state + 12345) % ((uint32_t)1 << 31); |
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return *rng_state / (double)((uint32_t)1 << 31); |
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} |
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|
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gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now) { |
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double new_timeout_millis = |
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backoff->multiplier * (double)backoff->current_timeout_millis; |
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double jitter_range = backoff->jitter * new_timeout_millis; |
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double jitter = |
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(2 * generate_uniform_random_number(&backoff->rng_state) - 1) * |
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jitter_range; |
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backoff->current_timeout_millis = |
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GPR_CLAMP((int64_t)(new_timeout_millis + jitter), |
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backoff->min_timeout_millis, backoff->max_timeout_millis); |
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return gpr_time_add( |
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now, gpr_time_from_millis(backoff->current_timeout_millis, GPR_TIMESPAN)); |
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} |
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@ -0,0 +1,65 @@ |
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/*
|
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* |
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* Copyright 2016, Google Inc. |
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* 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. |
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* |
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*/ |
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|
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#ifndef GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H |
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#define GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H |
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#include <grpc/support/time.h> |
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typedef struct { |
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/// const: multiplier between retry attempts
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double multiplier; |
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/// const: amount to randomize backoffs
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double jitter; |
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/// const: minimum time between retries in milliseconds
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int64_t min_timeout_millis; |
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/// const: maximum time between retries in milliseconds
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int64_t max_timeout_millis; |
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/// random number generator
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uint32_t rng_state; |
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/// current retry timeout in milliseconds
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int64_t current_timeout_millis; |
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} gpr_backoff; |
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/// Initialize backoff machinery - does not need to be destroyed
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void gpr_backoff_init(gpr_backoff *backoff, double multiplier, double jitter, |
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int64_t min_timeout_millis, int64_t max_timeout_millis); |
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/// Begin retry loop: returns a timespec for the NEXT retry
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gpr_timespec gpr_backoff_begin(gpr_backoff *backoff, gpr_timespec now); |
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/// Step a retry loop: returns a timespec for the NEXT retry
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gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now); |
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#endif // GRPC_INTERNAL_CORE_SUPPORT_BACKOFF_H
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@ -0,0 +1,107 @@ |
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/*
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* |
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* Copyright 2016, Google Inc. |
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* All rights reserved. |
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* |
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* 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 |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include "src/core/support/backoff.h" |
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#include <grpc/support/log.h> |
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#include "test/core/util/test_config.h" |
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static void test_constant_backoff(void) { |
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gpr_backoff backoff; |
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gpr_backoff_init(&backoff, 1.0, 0.0, 1000, 1000); |
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gpr_timespec now = gpr_time_0(GPR_TIMESPAN); |
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gpr_timespec next = gpr_backoff_begin(&backoff, now); |
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GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 1000); |
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for (int i = 0; i < 10000; i++) { |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 1000); |
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now = next; |
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} |
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} |
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static void test_no_jitter_backoff(void) { |
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gpr_backoff backoff; |
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gpr_backoff_init(&backoff, 2.0, 0.0, 1, 513); |
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gpr_timespec now = gpr_time_0(GPR_TIMESPAN); |
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gpr_timespec next = gpr_backoff_begin(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(1, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(3, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(7, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(15, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(31, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(63, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(127, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(255, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(511, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(1023, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(1536, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(2049, GPR_TIMESPAN), next) == 0); |
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now = next; |
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next = gpr_backoff_step(&backoff, now); |
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GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(2562, GPR_TIMESPAN), next) == 0); |
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} |
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int main(int argc, char **argv) { |
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grpc_test_init(argc, argv); |
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gpr_time_init(); |
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test_constant_backoff(); |
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test_no_jitter_backoff(); |
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return 0; |
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} |
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@ -0,0 +1,193 @@ |
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<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies\grpc.dependencies.zlib.targets')" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies\grpc.dependencies.zlib.targets')" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies\grpc.dependencies.openssl.targets')" /> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies\grpc.dependencies.openssl.targets')" /> |
||||
</ImportGroup> |
||||
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild"> |
||||
<PropertyGroup> |
||||
<ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText> |
||||
</PropertyGroup> |
||||
<Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets')" /> |
||||
<Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets')" /> |
||||
<Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets')" /> |
||||
<Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props')" /> |
||||
<Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets')" /> |
||||
</Target> |
||||
</Project> |
||||
|
||||
@ -0,0 +1,21 @@ |
||||
<?xml version="1.0" encoding="utf-8"?> |
||||
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> |
||||
<ItemGroup> |
||||
<ClCompile Include="$(SolutionDir)\..\test\core\support\backoff_test.c"> |
||||
<Filter>test\core\support</Filter> |
||||
</ClCompile> |
||||
</ItemGroup> |
||||
|
||||
<ItemGroup> |
||||
<Filter Include="test"> |
||||
<UniqueIdentifier>{4b7f1d25-d344-0bcb-63d8-2ba959874ea8}</UniqueIdentifier> |
||||
</Filter> |
||||
<Filter Include="test\core"> |
||||
<UniqueIdentifier>{2bd2fba5-8799-2c78-469f-ec3ba6b01da8}</UniqueIdentifier> |
||||
</Filter> |
||||
<Filter Include="test\core\support"> |
||||
<UniqueIdentifier>{2ef0cfa7-fe3d-2b82-7d0e-f9e293e8f98c}</UniqueIdentifier> |
||||
</Filter> |
||||
</ItemGroup> |
||||
</Project> |
||||
|
||||
Loading…
Reference in new issue