diff --git a/.clang-format b/.clang-format
index 90542e2..83c2ce5 100644
--- a/.clang-format
+++ b/.clang-format
@@ -36,7 +36,7 @@ BreakBeforeTernaryOperators: true
 BreakConstructorInitializers: BeforeColon
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
 BreakInheritanceList: BeforeColon
-ColumnLimit: 120
+ColumnLimit: 80
 CompactNamespaces: false
 ContinuationIndentWidth: 4
 EmptyLineBeforeAccessModifier: LogicalBlock
@@ -69,4 +69,5 @@ SpacesInContainerLiterals: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
 TabWidth: 4
-UseTab: Never
\ No newline at end of file
+UseTab: Never
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
index da612f5..1526c6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,8 @@ else()
     add_library(${PROJECT_NAME} STATIC "")
 endif()
 target_sources(${PROJECT_NAME} PRIVATE
+        src/ulib/base/location.h
+        src/ulib/base/location.cpp
             src/ulib/concorrency/barrier.cpp
             src/ulib/concorrency/barrier.h
             src/ulib/concorrency/mutex.cpp
@@ -36,7 +38,10 @@ target_sources(${PROJECT_NAME} PRIVATE
             src/ulib/concorrency/internal/condition_variable_impl.cpp
             src/ulib/concorrency/internal/condition_variable_impl.h
             src/ulib/concorrency/event.cpp
-            src/ulib/concorrency/event.h)
+            src/ulib/concorrency/event.h
+            src/ulib/system/thread.h
+            src/ulib/system/thread.cpp
+)
 
 find_package(Threads REQUIRED)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
diff --git a/src/ulib/base/location.cpp b/src/ulib/base/location.cpp
new file mode 100644
index 0000000..31013e6
--- /dev/null
+++ b/src/ulib/base/location.cpp
@@ -0,0 +1,60 @@
+#include "location.h"
+#include <sstream>
+
+namespace ulib {
+#if defined(__clang__) && defined(_MSC_VER)
+const char stripped[] = "ulib\\base\\location.cpp";
+#else
+const char stripped[] = "ulib/base/location.cpp";
+#endif
+
+#if !defined(ULIB_LOCATION_STRIPPED_PREFIX_LENGTH)                             \
+    && !defined(ULIB_PROJECT_ROOT_PATH)
+inline size_t
+StrippedFilePathPrefixLength()
+{
+    const char path[] = __FILE__;
+    static size_t stripped_file_path_prefix_length =
+        sizeof(path) - sizeof(stripped);
+    return stripped_file_path_prefix_length;
+}
+#elif defined(ULIB_LOCATION_STRIPPED_PREFIX_LENGTH)
+inline size_t
+StrippedFilePathPrefixLength()
+{
+    return ULIB_LOCATION_STRIPPED_PREFIX_LENGTH;
+}
+#else
+inline size_t
+StrippedFilePathPrefixLength()
+{
+    return sizeof(ULIB_PROJECT_ROOT_PATH);
+}
+#endif
+
+Location::Location() = default;
+
+Location::Location(const Location &other)
+    : function_name_(other.function_name_),
+      file_name_(other.file_name_),
+      line_number_(other.line_number_)
+{}
+
+Location &
+Location::operator=(const Location &other)
+{
+    function_name_ = other.function_name_;
+    file_name_ = other.file_name_;
+    line_number_ = other.line_number_;
+    return *this;
+}
+
+std::string
+Location::ToString() const
+{
+    std::stringstream ss;
+    ss << function_name_ << "@" << file_name_ << ":" << line_number_;
+    return ss.str();
+}
+
+}// namespace ulib
diff --git a/src/ulib/base/location.h b/src/ulib/base/location.h
new file mode 100644
index 0000000..aafdc81
--- /dev/null
+++ b/src/ulib/base/location.h
@@ -0,0 +1,37 @@
+#ifndef ULIB_SRC_ULIB_BASE_LOCATION_H_
+#define ULIB_SRC_ULIB_BASE_LOCATION_H_
+
+#include "types.h"
+#include "stringize_macros.h"
+#include <string>
+
+namespace ulib {
+class Location {
+public:
+    Location();
+    Location(const Location &other);
+    Location &operator=(const Location &other);
+
+    std::string ToString() const;
+
+    const char *function_name() const { return function_name_; }
+
+    const char *file_name() const { return file_name_; }
+
+    int line_number() const { return line_number_; }
+
+    static Location Current(const char *function_name = __builtin_FUNCTION(),
+                            const char *file_name = __builtin_FILE(),
+                            int line_number = __builtin_LINE());
+
+private:
+    Location(const char *function_name, const char *file_name, int line_number);
+    const char *function_name_ = nullptr;
+    const char *file_name_ = nullptr;
+    int line_number_ = -1;
+};
+
+#define ULIB_FROM_HERE ::ulib::Location::Current()
+
+}// namespace ulib
+#endif// ULIB_SRC_ULIB_BASE_LOCATION_H_
diff --git a/src/ulib/base/stringize_macros.h b/src/ulib/base/stringize_macros.h
new file mode 100644
index 0000000..00f95c2
--- /dev/null
+++ b/src/ulib/base/stringize_macros.h
@@ -0,0 +1,8 @@
+#ifndef ULIB_SRC_ULIB_BASE_STRINGIZE_MACROS_H_
+#define ULIB_SRC_ULIB_BASE_STRINGIZE_MACROS_H_
+
+#define STRINGIZE_NO_EXPANSION(x) #x
+
+#define STRINGIZE STRINGIZE_NO_EXPANSION(x)
+
+#endif// ULIB_SRC_ULIB_BASE_STRINGIZE_MACROS_H_
diff --git a/src/ulib/log/log.h b/src/ulib/log/log.h
index 856c259..0ee6ba4 100644
--- a/src/ulib/log/log.h
+++ b/src/ulib/log/log.h
@@ -5,17 +5,20 @@
 #ifndef ULIB_SRC_LOG_LOG_H_
 #define ULIB_SRC_LOG_LOG_H_
 
+#include "ulib/base/location.h"
 #include "logger.h"
 #include "level.h"
 #include <fmt/format.h>
 
 namespace tqcq {
 
-#define _ULOG(level, tag, fmt_str, ...)                                                                                \
-    tqcq::Logger::GetInstance().Log(level, __FILE__, __FUNCTION__, __LINE__, tag,                                      \
-                                    fmt::format(fmt_str, ##__VA_ARGS__).c_str())
+#define _ULOG(level, tag, fmt_str, ...)                                        \
+    tqcq::Logger::GetInstance().Log(                                           \
+        level, __FILE__, __FUNCTION__, __LINE__, tag,                          \
+        fmt::format(fmt_str, ##__VA_ARGS__).c_str())
 
-#define ULOG_SET_STRIPPED_PREFIX_LEN(len) ::tqcq::Logger::GetInstance().SetStrippedPrefixLen(len)
+#define ULOG_SET_STRIPPED_PREFIX_LEN(len)                                      \
+    ::tqcq::Logger::GetInstance().SetStrippedPrefixLen(len)
 
 #if ULOG_LEVEL <= ULOG_LEVEL_TRACE
 #define ULOG_TRACE(tag, ...) _ULOG(ULOG_LEVEL_TRACE, tag, __VA_ARGS__)
@@ -53,6 +56,17 @@ namespace tqcq {
 #define ULOG_FATAL(...) ((void) 0)
 #endif
 
+#define ULOG_ASSERT_WITH_TAG(expr, tag, ...)                                   \
+    do {                                                                       \
+        if (!(expr)) {                                                         \
+            _ULOG(ULOG_LEVEL_FATAL, tag, ##__VA_ARGS__);                       \
+            abort();                                                           \
+        }                                                                      \
+    } while (0)
+
+#define ULOG_ASSERT(expr, ...)                                                 \
+    ULOG_ASSERT_WITH_TAG(expr, "ulib_assert", ##__VA_ARGS__)
+
 }// namespace tqcq
 
 #endif//ULIB_SRC_LOG_LOG_H_
diff --git a/src/ulib/system/thread.cpp b/src/ulib/system/thread.cpp
new file mode 100644
index 0000000..871c3db
--- /dev/null
+++ b/src/ulib/system/thread.cpp
@@ -0,0 +1,125 @@
+#include "thread.h"
+#include <climits>
+#include <pthread.h>
+#include "ulib/log/log.h"
+#include "ulib/concorrency/countdown_latch.h"
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <exception>
+
+namespace ulib {
+
+pid_t
+GetTid()
+{
+    // TODO cache tid
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_12
+    uint64_t tid64;
+    pthread_threadid_np(NULL, &tid64);
+    return static_cast<pid_t>(tid64);
+#else
+    return static_cast<pid_t>(::syscall(SYS_gettid));
+#endif
+}
+
+class Thread::Impl {
+public:
+    Impl(const ThreadFunc &func, const std::string &thread_name)
+        : thread_(0),
+          started_(false),
+          joined_(false),
+          thread_name_(thread_name),
+          func_(func),
+          tid_(new pid_t(0)),
+          latch_(1)
+    {}
+
+    ~Impl()
+    {
+        if (started_ && !joined_) { pthread_detach(thread_); }
+    }
+
+    static void *ThreadRun(void *obj)
+    {
+        Impl *impl = static_cast<Impl *>(obj);
+        *impl->tid_ = GetTid();
+        impl->latch_.CountDown();
+        try {
+            impl->func_();
+        } catch (std::exception &ex) {
+            // do nothing
+            ULOG_ERROR("system.thread",
+                       "exception caught in Thread %s, reson: %s",
+                       impl->thread_name_.c_str(), ex.what());
+        } catch (...) {
+            // do nothing
+        }
+        return NULL;
+    }
+
+    void Start()
+    {
+        ULOG_ASSERT(!started_, "thread already started");
+        started_ = true;
+        if (pthread_create(&thread_, NULL, Impl::ThreadRun, this)) {
+            started_ = false;
+        } else {
+            latch_.Await();
+            ULOG_ASSERT(tid_.get(), "tid_ is null");
+        }
+    }
+
+    int Join()
+    {
+        ULOG_ASSERT(started_, "thread not started");
+        ULOG_ASSERT(!joined_, "thread already joined");
+        joined_ = true;
+        return pthread_join(thread_, NULL);
+    }
+
+    bool Started() const { return started_; }
+
+    bool Tid() const { return *tid_; }
+
+private:
+    pthread_t thread_;
+    bool started_;
+    bool joined_;
+
+    std::string thread_name_;
+    ThreadFunc func_;
+    std::shared_ptr<pid_t> tid_;
+    CountDownLatch latch_;
+};
+
+Thread::Thread(const ThreadFunc &func, const std::string &thread_name)
+    : impl_(new Impl(func, thread_name))
+{}
+
+// Thread(ThreadFunc &&func, const std::string &thread_name = std::string());
+Thread::~Thread() { delete impl_; }
+
+void
+Thread::Start()
+{
+    impl_->Start();
+}
+
+int
+Thread::Join()
+{
+    return impl_->Join();
+}
+
+bool
+Thread::Started() const
+{
+    return impl_->Started();
+}
+
+pid_t
+Thread::Tid() const
+{
+    return impl_->Tid();
+}
+}// namespace ulib
diff --git a/src/ulib/system/thread.h b/src/ulib/system/thread.h
new file mode 100644
index 0000000..a4de54c
--- /dev/null
+++ b/src/ulib/system/thread.h
@@ -0,0 +1,29 @@
+#ifndef ULIB_SRC_ULIB_SYSTEM_THREAD_H_
+#define ULIB_SRC_ULIB_SYSTEM_THREAD_H_
+#include "ulib/base/types.h"
+#include <functional>
+#include <string>
+
+namespace ulib {
+class Thread {
+public:
+    using ThreadFunc = std::function<void()>;
+    Thread(const ThreadFunc &func,
+           const std::string &thread_name = std::string());
+    // Thread(ThreadFunc &&func, const std::string &thread_name = std::string());
+    ~Thread();
+
+    void Start();
+    int Join();
+
+    bool Started() const;
+    pid_t Tid() const;
+    const std::string &name() const;
+
+private:
+    class Impl;
+    Impl *impl_;
+};
+
+}// namespace ulib
+#endif// ULIB_SRC_ULIB_SYSTEM_THREAD_H_
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8e3dc07..63baa0b 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -7,6 +7,7 @@ add_executable(ulib_test
         ulib/concorrency/mutex_unittest.cpp
         ulib/concorrency/event_unittest.cpp
         ulib/concorrency/countdown_latch_unittest.cpp
+        ulib/system/thread_unittest.cpp
 )
 target_link_libraries(ulib_test PRIVATE
         ulib
diff --git a/tests/ulib/system/thread_unittest.cpp b/tests/ulib/system/thread_unittest.cpp
new file mode 100644
index 0000000..190a905
--- /dev/null
+++ b/tests/ulib/system/thread_unittest.cpp
@@ -0,0 +1,17 @@
+#include <ulib/system/thread.h>
+#include <gtest/gtest.h>
+#include <ulib/concorrency/countdown_latch.h>
+
+TEST(Thread, Start)
+{
+    volatile int i = 0;
+    ulib::Thread thread([&]() {
+        EXPECT_EQ(i, 0);
+        i = 1;
+        EXPECT_EQ(i, 1);
+    });
+    EXPECT_EQ(i, 0);
+    thread.Start();
+    thread.Join();
+    EXPECT_EQ(i, 1);
+}