logd/LogBufferTest.cpp - LeafOS-Project/android_system_core - Gitiles

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "LogBuffer.h"

 #include <unistd.h>

 #include <memory>
 #include <vector>

 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <gtest/gtest.h>

 #include "ChattyLogBuffer.h"
 #include "LogReaderList.h"
 #include "LogReaderThread.h"
 #include "LogStatistics.h"
 #include "LogTags.h"
 #include "LogWhiteBlackList.h"
 #include "LogWriter.h"

 using android::base::Join;
 using android::base::StringPrintf;

 #ifndef __ANDROID__
 unsigned long __android_logger_get_buffer_size(log_id_t) {
     return 1024 * 1024;
 }

 bool __android_logger_valid_buffer_size(unsigned long) {
     return true;
 }
 #endif

 void android::prdebug(const char* fmt, ...) {
     va_list ap;
     va_start(ap, fmt);
     vfprintf(stderr, fmt, ap);
     fprintf(stderr, "\n");
     va_end(ap);
 }

 char* android::uidToName(uid_t) {
     return nullptr;
 }

 class TestWriter : public LogWriter {
   public:
     TestWriter(std::vector<std::pair<logger_entry, std::string>>* msgs, bool* released)
         : LogWriter(0, true, true), msgs_(msgs), released_(released) {}
     bool Write(const logger_entry& entry, const char* message) override {
         msgs_->emplace_back(entry, std::string(message, entry.len));
         return true;
     }

     void Release() {
         if (released_) *released_ = true;
     }

     std::string name() const override { return "test_writer"; }

   private:
     std::vector<std::pair<logger_entry, std::string>>* msgs_;
     bool* released_;
 };

 class LogBufferTest : public testing::Test {
   protected:
     void SetUp() override {
         log_buffer_.reset(new ChattyLogBuffer(&reader_list_, &tags_, &prune_, &stats_));
     }

     void FixupMessages(std::vector<std::pair<logger_entry, std::string>>* messages) {
         for (auto& [entry, message] : *messages) {
             entry.hdr_size = sizeof(logger_entry);
             entry.len = message.size();
         }
     }

     void LogMessages(const std::vector<std::pair<logger_entry, std::string>>& messages) {
         for (auto& [entry, message] : messages) {
             log_buffer_->Log(static_cast<log_id_t>(entry.lid), log_time(entry.sec, entry.nsec),
                              entry.uid, entry.pid, entry.tid, message.c_str(), message.size());
         }
     }

     std::vector<std::string> CompareLoggerEntries(const logger_entry& expected,
                                                   const logger_entry& result) {
         std::vector<std::string> errors;
         if (expected.len != result.len) {
             errors.emplace_back(
                     StringPrintf("len: %" PRIu16 " vs %" PRIu16, expected.len, result.len));
         }
         if (expected.hdr_size != result.hdr_size) {
             errors.emplace_back(StringPrintf("hdr_size: %" PRIu16 " vs %" PRIu16, expected.hdr_size,
                                              result.hdr_size));
         }
         if (expected.pid != result.pid) {
             errors.emplace_back(
                     StringPrintf("pid: %" PRIi32 " vs %" PRIi32, expected.pid, result.pid));
         }
         if (expected.tid != result.tid) {
             errors.emplace_back(
                     StringPrintf("tid: %" PRIu32 " vs %" PRIu32, expected.tid, result.tid));
         }
         if (expected.sec != result.sec) {
             errors.emplace_back(
                     StringPrintf("sec: %" PRIu32 " vs %" PRIu32, expected.sec, result.sec));
         }
         if (expected.nsec != result.nsec) {
             errors.emplace_back(
                     StringPrintf("nsec: %" PRIu32 " vs %" PRIu32, expected.nsec, result.nsec));
         }
         if (expected.lid != result.lid) {
             errors.emplace_back(
                     StringPrintf("lid: %" PRIu32 " vs %" PRIu32, expected.lid, result.lid));
         }
         if (expected.uid != result.uid) {
             errors.emplace_back(
                     StringPrintf("uid: %" PRIu32 " vs %" PRIu32, expected.uid, result.uid));
         }
         return errors;
     }

     std::string CompareMessages(const std::string& expected, const std::string& result) {
         if (expected == result) {
             return {};
         }
         auto shorten_string = [](const std::string& in) {
             if (in.size() > 10) {
                 return in.substr(0, 10) + "...";
             }
             return in;
         };

         size_t diff_index = 0;
         for (; diff_index < std::min(expected.size(), result.size()); ++diff_index) {
             if (expected[diff_index] != result[diff_index]) {
                 break;
             }
         }

         if (diff_index < 10) {
             auto expected_short = shorten_string(expected);
             auto result_short = shorten_string(result);
             return StringPrintf("msg: %s vs %s", expected_short.c_str(), result_short.c_str());
         }

         auto expected_short = shorten_string(expected.substr(diff_index));
         auto result_short = shorten_string(result.substr(diff_index));
         return StringPrintf("msg: index %zu: %s vs %s", diff_index, expected_short.c_str(),
                             result_short.c_str());
     }

     void CompareLogMessages(const std::vector<std::pair<logger_entry, std::string>>& expected,
                             const std::vector<std::pair<logger_entry, std::string>>& result) {
         EXPECT_EQ(expected.size(), result.size());
         size_t end = std::min(expected.size(), result.size());
         size_t num_errors = 0;
         for (size_t i = 0; i < end; ++i) {
             auto errors = CompareLoggerEntries(expected[i].first, result[i].first);
             auto msg_error = CompareMessages(expected[i].second, result[i].second);
             if (!msg_error.empty()) {
                 errors.emplace_back(msg_error);
             }
             if (!errors.empty()) {
                 GTEST_LOG_(ERROR) << "Mismatch log message " << i << " " << Join(errors, " ");
                 ++num_errors;
             }
         }
         EXPECT_EQ(0U, num_errors);
     }

     LogReaderList reader_list_;
     LogTags tags_;
     PruneList prune_;
     LogStatistics stats_{false};
     std::unique_ptr<LogBuffer> log_buffer_;
 };

 TEST_F(LogBufferTest, smoke) {
     std::vector<std::pair<logger_entry, std::string>> log_messages = {
             {{
                      .pid = 1,
                      .tid = 1,
                      .sec = 1234,
                      .nsec = 323001,
                      .lid = LOG_ID_MAIN,
                      .uid = 0,
              },
              "smoke test"},
     };
     FixupMessages(&log_messages);
     LogMessages(log_messages);

     std::vector<std::pair<logger_entry, std::string>> read_log_messages;
     std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
     uint64_t flush_result = log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
     EXPECT_EQ(1ULL, flush_result);
     CompareLogMessages(log_messages, read_log_messages);
 }

 TEST_F(LogBufferTest, smoke_with_reader_thread) {
     std::vector<std::pair<logger_entry, std::string>> log_messages = {
             {{.pid = 1, .tid = 2, .sec = 10000, .nsec = 20001, .lid = LOG_ID_MAIN, .uid = 0},
              "first"},
             {{.pid = 10, .tid = 2, .sec = 10000, .nsec = 20002, .lid = LOG_ID_MAIN, .uid = 0},
              "second"},
             {{.pid = 100, .tid = 2, .sec = 10000, .nsec = 20003, .lid = LOG_ID_KERNEL, .uid = 0},
              "third"},
             {{.pid = 10, .tid = 2, .sec = 10000, .nsec = 20004, .lid = LOG_ID_MAIN, .uid = 0},
              "fourth"},
             {{.pid = 1, .tid = 2, .sec = 10000, .nsec = 20005, .lid = LOG_ID_RADIO, .uid = 0},
              "fifth"},
             {{.pid = 2, .tid = 2, .sec = 10000, .nsec = 20006, .lid = LOG_ID_RADIO, .uid = 0},
              "sixth"},
             {{.pid = 3, .tid = 2, .sec = 10000, .nsec = 20007, .lid = LOG_ID_RADIO, .uid = 0},
              "seventh"},
             {{.pid = 4, .tid = 2, .sec = 10000, .nsec = 20008, .lid = LOG_ID_MAIN, .uid = 0},
              "eighth"},
             {{.pid = 5, .tid = 2, .sec = 10000, .nsec = 20009, .lid = LOG_ID_CRASH, .uid = 0},
              "nineth"},
             {{.pid = 6, .tid = 2, .sec = 10000, .nsec = 20011, .lid = LOG_ID_MAIN, .uid = 0},
              "tenth"},
     };
     FixupMessages(&log_messages);
     LogMessages(log_messages);

     std::vector<std::pair<logger_entry, std::string>> read_log_messages;
     bool released = false;

     {
         auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
         std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
         std::unique_ptr<LogReaderThread> log_reader(
                 new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
                                     0, ~0, 0, {}, 1, {}));
         reader_list_.reader_threads().emplace_back(std::move(log_reader));
     }

     while (!released) {
         usleep(5000);
     }
     {
         auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
         EXPECT_EQ(0U, reader_list_.reader_threads().size());
     }
     CompareLogMessages(log_messages, read_log_messages);
 }

 // Generate random messages, set the 'sec' parameter explicit though, to be able to track the
 // expected order of messages.
 std::pair<logger_entry, std::string> GenerateRandomLogMessage(uint32_t sec) {
     auto rand_uint32 = [](int max) -> uint32_t { return rand() % max; };
     logger_entry entry = {
             .hdr_size = sizeof(logger_entry),
             .pid = rand() % 5000,
             .tid = rand_uint32(5000),
             .sec = sec,
             .nsec = rand_uint32(NS_PER_SEC),
             .lid = rand_uint32(LOG_ID_STATS),
             .uid = rand_uint32(100000),
     };

     // See comment in ChattyLogBuffer::Log() for why this is disallowed.
     if (entry.nsec % 1000 == 0) {
         ++entry.nsec;
     }

     if (entry.lid == LOG_ID_EVENTS) {
         entry.lid = LOG_ID_KERNEL;
     }

     std::string message;
     char priority = ANDROID_LOG_INFO + rand() % 2;
     message.push_back(priority);

     int tag_length = 2 + rand() % 10;
     for (int i = 0; i < tag_length; ++i) {
         message.push_back('a' + rand() % 26);
     }
     message.push_back('\0');

     int msg_length = 2 + rand() % 1000;
     for (int i = 0; i < msg_length; ++i) {
         message.push_back('a' + rand() % 26);
     }
     message.push_back('\0');

     entry.len = message.size();

     return {entry, message};
 }

 TEST_F(LogBufferTest, random_messages) {
     srand(1);
     std::vector<std::pair<logger_entry, std::string>> log_messages;
     for (size_t i = 0; i < 1000; ++i) {
         log_messages.emplace_back(GenerateRandomLogMessage(i));
     }
     LogMessages(log_messages);

     std::vector<std::pair<logger_entry, std::string>> read_log_messages;
     bool released = false;

     {
         auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
         std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
         std::unique_ptr<LogReaderThread> log_reader(
                 new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
                                     0, ~0, 0, {}, 1, {}));
         reader_list_.reader_threads().emplace_back(std::move(log_reader));
     }

     while (!released) {
         usleep(5000);
     }
     {
         auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
         EXPECT_EQ(0U, reader_list_.reader_threads().size());
     }
     CompareLogMessages(log_messages, read_log_messages);
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "LogBuffer.h"

	#include <unistd.h>

	#include <memory>
	#include <vector>

	#include <android-base/stringprintf.h>
	#include <android-base/strings.h>
	#include <gtest/gtest.h>

	#include "ChattyLogBuffer.h"
	#include "LogReaderList.h"
	#include "LogReaderThread.h"
	#include "LogStatistics.h"
	#include "LogTags.h"
	#include "LogWhiteBlackList.h"
	#include "LogWriter.h"

	using android::base::Join;
	using android::base::StringPrintf;

	#ifndef __ANDROID__
	unsigned long __android_logger_get_buffer_size(log_id_t) {
	return 1024 * 1024;
	}

	bool __android_logger_valid_buffer_size(unsigned long) {
	return true;
	}
	#endif

	void android::prdebug(const char* fmt, ...) {
	va_list ap;
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, "\n");
	va_end(ap);
	}

	char* android::uidToName(uid_t) {
	return nullptr;
	}

	class TestWriter : public LogWriter {
	public:
	TestWriter(std::vector<std::pair<logger_entry, std::string>>* msgs, bool* released)
	: LogWriter(0, true, true), msgs_(msgs), released_(released) {}
	bool Write(const logger_entry& entry, const char* message) override {
	msgs_->emplace_back(entry, std::string(message, entry.len));
	return true;
	}

	void Release() {
	if (released_) *released_ = true;
	}

	std::string name() const override { return "test_writer"; }

	private:
	std::vector<std::pair<logger_entry, std::string>>* msgs_;
	bool* released_;
	};

	class LogBufferTest : public testing::Test {
	protected:
	void SetUp() override {
	log_buffer_.reset(new ChattyLogBuffer(&reader_list_, &tags_, &prune_, &stats_));
	}

	void FixupMessages(std::vector<std::pair<logger_entry, std::string>>* messages) {
	for (auto& [entry, message] : *messages) {
	entry.hdr_size = sizeof(logger_entry);
	entry.len = message.size();
	}
	}

	void LogMessages(const std::vector<std::pair<logger_entry, std::string>>& messages) {
	for (auto& [entry, message] : messages) {
	log_buffer_->Log(static_cast<log_id_t>(entry.lid), log_time(entry.sec, entry.nsec),
	entry.uid, entry.pid, entry.tid, message.c_str(), message.size());
	}
	}

	std::vector<std::string> CompareLoggerEntries(const logger_entry& expected,
	const logger_entry& result) {
	std::vector<std::string> errors;
	if (expected.len != result.len) {
	errors.emplace_back(
	StringPrintf("len: %" PRIu16 " vs %" PRIu16, expected.len, result.len));
	}
	if (expected.hdr_size != result.hdr_size) {
	errors.emplace_back(StringPrintf("hdr_size: %" PRIu16 " vs %" PRIu16, expected.hdr_size,
	result.hdr_size));
	}
	if (expected.pid != result.pid) {
	errors.emplace_back(
	StringPrintf("pid: %" PRIi32 " vs %" PRIi32, expected.pid, result.pid));
	}
	if (expected.tid != result.tid) {
	errors.emplace_back(
	StringPrintf("tid: %" PRIu32 " vs %" PRIu32, expected.tid, result.tid));
	}
	if (expected.sec != result.sec) {
	errors.emplace_back(
	StringPrintf("sec: %" PRIu32 " vs %" PRIu32, expected.sec, result.sec));
	}
	if (expected.nsec != result.nsec) {
	errors.emplace_back(
	StringPrintf("nsec: %" PRIu32 " vs %" PRIu32, expected.nsec, result.nsec));
	}
	if (expected.lid != result.lid) {
	errors.emplace_back(
	StringPrintf("lid: %" PRIu32 " vs %" PRIu32, expected.lid, result.lid));
	}
	if (expected.uid != result.uid) {
	errors.emplace_back(
	StringPrintf("uid: %" PRIu32 " vs %" PRIu32, expected.uid, result.uid));
	}
	return errors;
	}

	std::string CompareMessages(const std::string& expected, const std::string& result) {
	if (expected == result) {
	return {};
	}
	auto shorten_string = [](const std::string& in) {
	if (in.size() > 10) {
	return in.substr(0, 10) + "...";
	}
	return in;
	};

	size_t diff_index = 0;
	for (; diff_index < std::min(expected.size(), result.size()); ++diff_index) {
	if (expected[diff_index] != result[diff_index]) {
	break;
	}
	}

	if (diff_index < 10) {
	auto expected_short = shorten_string(expected);
	auto result_short = shorten_string(result);
	return StringPrintf("msg: %s vs %s", expected_short.c_str(), result_short.c_str());
	}

	auto expected_short = shorten_string(expected.substr(diff_index));
	auto result_short = shorten_string(result.substr(diff_index));
	return StringPrintf("msg: index %zu: %s vs %s", diff_index, expected_short.c_str(),
	result_short.c_str());
	}

	void CompareLogMessages(const std::vector<std::pair<logger_entry, std::string>>& expected,
	const std::vector<std::pair<logger_entry, std::string>>& result) {
	EXPECT_EQ(expected.size(), result.size());
	size_t end = std::min(expected.size(), result.size());
	size_t num_errors = 0;
	for (size_t i = 0; i < end; ++i) {
	auto errors = CompareLoggerEntries(expected[i].first, result[i].first);
	auto msg_error = CompareMessages(expected[i].second, result[i].second);
	if (!msg_error.empty()) {
	errors.emplace_back(msg_error);
	}
	if (!errors.empty()) {
	GTEST_LOG_(ERROR) << "Mismatch log message " << i << " " << Join(errors, " ");
	++num_errors;
	}
	}
	EXPECT_EQ(0U, num_errors);
	}

	LogReaderList reader_list_;
	LogTags tags_;
	PruneList prune_;
	LogStatistics stats_{false};
	std::unique_ptr<LogBuffer> log_buffer_;
	};

	TEST_F(LogBufferTest, smoke) {
	std::vector<std::pair<logger_entry, std::string>> log_messages = {
	{{
	.pid = 1,
	.tid = 1,
	.sec = 1234,
	.nsec = 323001,
	.lid = LOG_ID_MAIN,
	.uid = 0,
	},
	"smoke test"},
	};
	FixupMessages(&log_messages);
	LogMessages(log_messages);

	std::vector<std::pair<logger_entry, std::string>> read_log_messages;
	std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, nullptr));
	uint64_t flush_result = log_buffer_->FlushTo(test_writer.get(), 1, nullptr, nullptr);
	EXPECT_EQ(1ULL, flush_result);
	CompareLogMessages(log_messages, read_log_messages);
	}

	TEST_F(LogBufferTest, smoke_with_reader_thread) {
	std::vector<std::pair<logger_entry, std::string>> log_messages = {
	{{.pid = 1, .tid = 2, .sec = 10000, .nsec = 20001, .lid = LOG_ID_MAIN, .uid = 0},
	"first"},
	{{.pid = 10, .tid = 2, .sec = 10000, .nsec = 20002, .lid = LOG_ID_MAIN, .uid = 0},
	"second"},
	{{.pid = 100, .tid = 2, .sec = 10000, .nsec = 20003, .lid = LOG_ID_KERNEL, .uid = 0},
	"third"},
	{{.pid = 10, .tid = 2, .sec = 10000, .nsec = 20004, .lid = LOG_ID_MAIN, .uid = 0},
	"fourth"},
	{{.pid = 1, .tid = 2, .sec = 10000, .nsec = 20005, .lid = LOG_ID_RADIO, .uid = 0},
	"fifth"},
	{{.pid = 2, .tid = 2, .sec = 10000, .nsec = 20006, .lid = LOG_ID_RADIO, .uid = 0},
	"sixth"},
	{{.pid = 3, .tid = 2, .sec = 10000, .nsec = 20007, .lid = LOG_ID_RADIO, .uid = 0},
	"seventh"},
	{{.pid = 4, .tid = 2, .sec = 10000, .nsec = 20008, .lid = LOG_ID_MAIN, .uid = 0},
	"eighth"},
	{{.pid = 5, .tid = 2, .sec = 10000, .nsec = 20009, .lid = LOG_ID_CRASH, .uid = 0},
	"nineth"},
	{{.pid = 6, .tid = 2, .sec = 10000, .nsec = 20011, .lid = LOG_ID_MAIN, .uid = 0},
	"tenth"},
	};
	FixupMessages(&log_messages);
	LogMessages(log_messages);

	std::vector<std::pair<logger_entry, std::string>> read_log_messages;
	bool released = false;

	{
	auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
	std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
	std::unique_ptr<LogReaderThread> log_reader(
	new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
	0, ~0, 0, {}, 1, {}));
	reader_list_.reader_threads().emplace_back(std::move(log_reader));
	}

	while (!released) {
	usleep(5000);
	}
	{
	auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
	EXPECT_EQ(0U, reader_list_.reader_threads().size());
	}
	CompareLogMessages(log_messages, read_log_messages);
	}

	// Generate random messages, set the 'sec' parameter explicit though, to be able to track the
	// expected order of messages.
	std::pair<logger_entry, std::string> GenerateRandomLogMessage(uint32_t sec) {
	auto rand_uint32 = [](int max) -> uint32_t { return rand() % max; };
	logger_entry entry = {
	.hdr_size = sizeof(logger_entry),
	.pid = rand() % 5000,
	.tid = rand_uint32(5000),
	.sec = sec,
	.nsec = rand_uint32(NS_PER_SEC),
	.lid = rand_uint32(LOG_ID_STATS),
	.uid = rand_uint32(100000),
	};

	// See comment in ChattyLogBuffer::Log() for why this is disallowed.
	if (entry.nsec % 1000 == 0) {
	++entry.nsec;
	}

	if (entry.lid == LOG_ID_EVENTS) {
	entry.lid = LOG_ID_KERNEL;
	}

	std::string message;
	char priority = ANDROID_LOG_INFO + rand() % 2;
	message.push_back(priority);

	int tag_length = 2 + rand() % 10;
	for (int i = 0; i < tag_length; ++i) {
	message.push_back('a' + rand() % 26);
	}
	message.push_back('\0');

	int msg_length = 2 + rand() % 1000;
	for (int i = 0; i < msg_length; ++i) {
	message.push_back('a' + rand() % 26);
	}
	message.push_back('\0');

	entry.len = message.size();

	return {entry, message};
	}

	TEST_F(LogBufferTest, random_messages) {
	srand(1);
	std::vector<std::pair<logger_entry, std::string>> log_messages;
	for (size_t i = 0; i < 1000; ++i) {
	log_messages.emplace_back(GenerateRandomLogMessage(i));
	}
	LogMessages(log_messages);

	std::vector<std::pair<logger_entry, std::string>> read_log_messages;
	bool released = false;

	{
	auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
	std::unique_ptr<LogWriter> test_writer(new TestWriter(&read_log_messages, &released));
	std::unique_ptr<LogReaderThread> log_reader(
	new LogReaderThread(log_buffer_.get(), &reader_list_, std::move(test_writer), true,
	0, ~0, 0, {}, 1, {}));
	reader_list_.reader_threads().emplace_back(std::move(log_reader));
	}

	while (!released) {
	usleep(5000);
	}
	{
	auto lock = std::unique_lock{reader_list_.reader_threads_lock()};
	EXPECT_EQ(0U, reader_list_.reader_threads().size());
	}
	CompareLogMessages(log_messages, read_log_messages);
	}