edff3ff4d3
This provides a simple way to implement exponential backoff using a do
while loop.
Usage example (also see the change to LockFileManager.cpp):
```
ExponentialBackoff Backoff(10s);
do {
if (tryToDoSomething())
return ItWorked;
} while (Backoff.waitForNextAttempt());
return Timeout;
```
Abstracting this out of `LockFileManager` as the module build daemon
will need it.
32 lines
992 B
C++
32 lines
992 B
C++
//===- unittests/ExponentialBackoffTest.cpp -------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ExponentialBackoff.h"
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#include "gtest/gtest.h"
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#include <chrono>
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using namespace llvm;
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using namespace std::chrono_literals;
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namespace {
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TEST(ExponentialBackoffTest, Timeout) {
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auto Start = std::chrono::steady_clock::now();
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// Use short enough times that this test runs quickly.
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ExponentialBackoff Backoff(100ms, 1ms, 10ms);
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do {
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} while (Backoff.waitForNextAttempt());
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auto Duration = std::chrono::steady_clock::now() - Start;
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EXPECT_GE(Duration, 100ms);
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}
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// Testing individual wait duration is omitted as those tests would be
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// non-deterministic.
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} // end anonymous namespace
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