abe04e3295
This implements a simple buffer queue to manage a pre-allocated queue of fixed-sized buffers to hold XRay records. We need this to support Flight Data Recorder (FDR) mode. We also implement this as a sub-library first to allow for development before actually using it in an implementation. Some important properties of the buffer queue: - Thread-safe enqueueing/dequeueing of fixed-size buffers. - Pre-allocation of buffers at construction. This is a re-roll of the previous attempt to submit, because it caused failures in arm and aarch64. Reviewers: majnemer, echristo, rSerge Subscribers: tberghammer, danalbert, srhines, modocache, mehdi_amini, mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D26232 llvm-svn: 288775
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
//===-- buffer_queue_test.cc ----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a function call tracing system.
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//
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//===----------------------------------------------------------------------===//
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#include "xray_buffer_queue.h"
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#include "gtest/gtest.h"
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#include <future>
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#include <unistd.h>
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namespace __xray {
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static constexpr size_t kSize = 4096;
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TEST(BufferQueueTest, API) { BufferQueue Buffers(kSize, 1); }
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TEST(BufferQueueTest, GetAndRelease) {
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BufferQueue Buffers(kSize, 1);
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BufferQueue::Buffer Buf;
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ASSERT_FALSE(Buffers.getBuffer(Buf));
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ASSERT_NE(nullptr, Buf.Buffer);
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ASSERT_FALSE(Buffers.releaseBuffer(Buf));
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ASSERT_EQ(nullptr, Buf.Buffer);
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}
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TEST(BufferQueueTest, GetUntilFailed) {
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BufferQueue Buffers(kSize, 1);
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BufferQueue::Buffer Buf0;
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EXPECT_FALSE(Buffers.getBuffer(Buf0));
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BufferQueue::Buffer Buf1;
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EXPECT_EQ(std::errc::not_enough_memory, Buffers.getBuffer(Buf1));
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EXPECT_FALSE(Buffers.releaseBuffer(Buf0));
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}
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TEST(BufferQueueTest, ReleaseUnknown) {
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BufferQueue Buffers(kSize, 1);
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BufferQueue::Buffer Buf;
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Buf.Buffer = reinterpret_cast<void *>(0xdeadbeef);
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Buf.Size = kSize;
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EXPECT_EQ(std::errc::argument_out_of_domain, Buffers.releaseBuffer(Buf));
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}
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TEST(BufferQueueTest, ErrorsWhenFinalising) {
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BufferQueue Buffers(kSize, 2);
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BufferQueue::Buffer Buf;
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ASSERT_FALSE(Buffers.getBuffer(Buf));
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ASSERT_NE(nullptr, Buf.Buffer);
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ASSERT_FALSE(Buffers.finalize());
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BufferQueue::Buffer OtherBuf;
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ASSERT_EQ(std::errc::state_not_recoverable, Buffers.getBuffer(OtherBuf));
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ASSERT_EQ(std::errc::state_not_recoverable, Buffers.finalize());
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ASSERT_FALSE(Buffers.releaseBuffer(Buf));
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}
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TEST(BufferQueueTest, MultiThreaded) {
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BufferQueue Buffers(kSize, 100);
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auto F = [&] {
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BufferQueue::Buffer B;
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while (!Buffers.getBuffer(B)) {
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Buffers.releaseBuffer(B);
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}
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};
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auto T0 = std::async(std::launch::async, F);
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auto T1 = std::async(std::launch::async, F);
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auto T2 = std::async(std::launch::async, [&] {
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while (!Buffers.finalize())
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;
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});
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F();
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}
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} // namespace __xray
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