test

14 files changed, 1328 insertions, 81 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f00e62e..b96abd8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,5 @@
 cmake_minimum_required(VERSION 3.16)
 
-option(KIT_ENABLE_LIBRARY "Enable library" ON)
 option(KIT_ENABLE_TESTING "Enable testing" ON)
 
 option(KIT_DISABLE_SYSTEM_MALLOC "Disable system memory allocator" OFF)
@@ -22,36 +21,118 @@ project(
   DESCRIPTION "A collection of C libraries"
   LANGUAGES C CXX)
 
-if(KIT_ENABLE_LIBRARY OR KIT_ENABLE_TESTING)
-  add_library(${KIT_LIBRARY} STATIC)
-  add_library(${KIT_PROJECT}::${KIT_LIBRARY} ALIAS ${KIT_LIBRARY})
-  target_include_directories(
-    ${KIT_LIBRARY} INTERFACE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>)
-  target_compile_features(${KIT_LIBRARY} PUBLIC c_std_11)
+add_library(${KIT_LIBRARY} STATIC)
+add_library(${KIT_PROJECT}::${KIT_LIBRARY} ALIAS ${KIT_LIBRARY})
+target_include_directories(
+  ${KIT_LIBRARY} INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>)
+target_compile_features(${KIT_LIBRARY} PUBLIC c_std_11)
+
+include(CheckCSourceRuns)
+
+check_c_source_runs(
+  "
+  #include <time.h>
+  int main() {
+    struct timespec t;
+    return 0;
+  }
+  "
+  KIT_HAVE_STRUCT_TIMESPEC
+)
+
+check_c_source_runs(
+  "
+  #include <time.h>
+  int main() {
+    struct timespec t;
+    timespec_get(&t, TIME_UTC);
+    return 0;
+  }
+  "
+  KIT_HAVE_TIMESPEC_GET
+)
+
+check_c_source_runs(
+  "
+  #include <pthread.h>
+  int main() {
+    return 0;
+  }
+  "
+  KIT_HAVE_PTHREAD
+)
+
+check_c_source_runs(
+  "
+  #include <windows.h>
+  int main() {
+    return 0;
+  }
+  "
+  KIT_HAVE_WINDOWS
+)
+
+check_c_source_runs(
+  "
+  #include <stdlib.h>
+  int main() {
+    void *p = malloc(10);
+    free(p);
+    return 0;
+  }
+  "
+  KIT_HAVE_MALLOC
+)
+
+if(NOT KIT_HAVE_PTHREAD AND NOT KIT_HAVE_WINDOWS)
+  set(KIT_DISABLE_SYSTEM_THREADS ON)
+endif()
 
-  if(KIT_DISABLE_SYSTEM_MALLOC)
-    target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_DISABLE_SYSTEM_MALLOC)
-  endif()
+if(NOT KIT_HAVE_MALLOC)
+  set(KIT_DISABLE_SYSTEM_MALLOC ON)
+endif()
 
-  if(KIT_DISABLE_SYSTEM_THREADS)
-    target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_DISABLE_SYSTEM_THREADS)
-  endif()
+if(KIT_HAVE_STRUCT_TIMESPEC)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_HAVE_STRUCT_TIMESPEC)
+endif()
 
-  add_library(${KIT_TEST_LIBRARY} STATIC)
-  add_library(${KIT_PROJECT}::${KIT_TEST_LIBRARY} ALIAS ${KIT_TEST_LIBRARY})
-  target_include_directories(
-    ${KIT_TEST_LIBRARY} INTERFACE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>)
-  target_compile_features(${KIT_TEST_LIBRARY} PUBLIC c_std_11)
-  target_compile_features(${KIT_TEST_LIBRARY} PUBLIC cxx_std_11)
+if(KIT_HAVE_TIMESPEC_GET)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_HAVE_TIMESPEC_GET)
 endif()
 
-enable_testing()
+if(KIT_HAVE_PTHREAD)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_HAVE_PTHREAD)
+endif()
 
-if(KIT_ENABLE_TESTING)
+if(KIT_HAVE_WINDOWS)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_HAVE_WINDOWS)
+endif()
+
+if(KIT_DISABLE_SYSTEM_MALLOC)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_DISABLE_SYSTEM_MALLOC)
+endif()
+
+if(KIT_DISABLE_SYSTEM_THREADS)
+  target_compile_definitions(${KIT_LIBRARY} PUBLIC KIT_DISABLE_SYSTEM_THREADS)
+endif()
+
+if(NOT KIT_DISABLE_SYSTEM_THREADS)
   find_package(Threads REQUIRED)
+  target_link_libraries(${KIT_LIBRARY} PUBLIC Threads::Threads)
+endif()
+
+add_library(${KIT_TEST_LIBRARY} STATIC)
+add_library(${KIT_PROJECT}::${KIT_TEST_LIBRARY} ALIAS ${KIT_TEST_LIBRARY})
+target_include_directories(
+  ${KIT_TEST_LIBRARY} INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>)
+target_compile_features(${KIT_TEST_LIBRARY} PUBLIC c_std_11)
+target_compile_features(${KIT_TEST_LIBRARY} PUBLIC cxx_std_11)
 
+enable_testing()
+
+if(KIT_ENABLE_TESTING)
   add_executable(${KIT_TEST_SUITE})
   add_executable(${KIT_PROJECT}::${KIT_TEST_SUITE} ALIAS ${KIT_TEST_SUITE})
   target_compile_features(${KIT_TEST_SUITE} PRIVATE c_std_11)
@@ -79,63 +160,61 @@ endif()
 
 add_subdirectory(source)
 
-if(KIT_ENABLE_LIBRARY)
-  include(GNUInstallDirs)
-
-  file(
-    GLOB_RECURSE headers_
-    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/source/kit
-    ${CMAKE_CURRENT_SOURCE_DIR}/source/kit/*.h)
-
-  foreach(path_ ${headers_})
-    get_filename_component(dir_ "${path_}" DIRECTORY)
-
-    install(
-      FILES ${CMAKE_CURRENT_SOURCE_DIR}/source/kit/${path_}
-      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/kit/${dir_})
-  endforeach()
-
-  unset(headers_)
-  unset(path_)
-  unset(dir_)
-
-  install(
-    TARGETS ${KIT_LIBRARY} ${KIT_TEST_LIBRARY}
-    EXPORT ${KIT_TARGETS}
-    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
-
-  install(
-    EXPORT ${KIT_TARGETS}
-    FILE ${KIT_TARGETS}.cmake
-    NAMESPACE ${PROJECT_NAME}::
-    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
-
-  export(
-    EXPORT ${KIT_TARGETS}
-    FILE "${CMAKE_CURRENT_BINARY_DIR}/cmake/${KIT_TARGETS}.cmake"
-    NAMESPACE ${PROJECT_NAME}::)
+include(GNUInstallDirs)
 
-  include(CMakePackageConfigHelpers)
+file(
+  GLOB_RECURSE headers_
+  RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/source/kit
+  ${CMAKE_CURRENT_SOURCE_DIR}/source/kit/*.h)
 
-  string(TOLOWER ${PROJECT_NAME} project_lower_)
-
-  configure_package_config_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/config.cmake.in
-    "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config.cmake"
-    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
-
-  write_basic_package_version_file(
-    "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config-version.cmake"
-    VERSION "${PROJECT_VERSION}"
-    COMPATIBILITY AnyNewerVersion)
+foreach(path_ ${headers_})
+  get_filename_component(dir_ "${path_}" DIRECTORY)
 
   install(
-    FILES
-    "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config.cmake"
-    "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config-version.cmake"
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
-
-  unset(project_lower_)
-endif()
+    FILES ${CMAKE_CURRENT_SOURCE_DIR}/source/kit/${path_}
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/kit/${dir_})
+endforeach()
+
+unset(headers_)
+unset(path_)
+unset(dir_)
+
+install(
+  TARGETS ${KIT_LIBRARY} ${KIT_TEST_LIBRARY}
+  EXPORT ${KIT_TARGETS}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+install(
+  EXPORT ${KIT_TARGETS}
+  FILE ${KIT_TARGETS}.cmake
+  NAMESPACE ${PROJECT_NAME}::
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
+
+export(
+  EXPORT ${KIT_TARGETS}
+  FILE "${CMAKE_CURRENT_BINARY_DIR}/cmake/${KIT_TARGETS}.cmake"
+  NAMESPACE ${PROJECT_NAME}::)
+
+include(CMakePackageConfigHelpers)
+
+string(TOLOWER ${PROJECT_NAME} project_lower_)
+
+configure_package_config_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/config.cmake.in
+  "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config.cmake"
+  INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+
+write_basic_package_version_file(
+  "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config-version.cmake"
+  VERSION "${PROJECT_VERSION}"
+  COMPATIBILITY AnyNewerVersion)
+
+install(
+  FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config.cmake"
+  "${CMAKE_CURRENT_BINARY_DIR}/${project_lower_}-config-version.cmake"
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+
+unset(project_lower_)
\ No newline at end of file
diff --git a/gen_cmake.py b/gen_cmake.py
index 3d1a520..ec3a176 100755
--- a/gen_cmake.py
+++ b/gen_cmake.py
@@ -39,7 +39,7 @@ def print_list(s: list, offset: int):
 
 def print_sources(folder: str, target_name: str):
   buf = ''
-  srcs = get_files(folder, '*.c')
+  srcs = get_files(folder, '*.c') + get_files(folder, '*.cpp')
   hdrs = get_files(folder, '*.h')
   if len(srcs) > 0 or len(hdrs) > 0:
     buf += 'target_sources(\n  ' + target_name
diff --git a/source/kit/CMakeLists.txt b/source/kit/CMakeLists.txt
index 5891851..397b404 100644
--- a/source/kit/CMakeLists.txt
+++ b/source/kit/CMakeLists.txt
@@ -15,3 +15,4 @@ target_sources(
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/lower_bound.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/array_ref.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/mersenne_twister_64.h>)
+add_subdirectory(c11)
diff --git a/source/kit/c11/CMakeLists.txt b/source/kit/c11/CMakeLists.txt
new file mode 100644
index 0000000..205b256
--- /dev/null
+++ b/source/kit/c11/CMakeLists.txt
@@ -0,0 +1,6 @@
+target_sources(
+  ${KIT_LIBRARY}
+    PUBLIC
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/time.h>
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/threads.h>)
+add_subdirectory(impl)
diff --git a/source/kit/c11/impl/CMakeLists.txt b/source/kit/c11/impl/CMakeLists.txt
new file mode 100644
index 0000000..c64b895
--- /dev/null
+++ b/source/kit/c11/impl/CMakeLists.txt
@@ -0,0 +1,7 @@
+target_sources(
+  ${KIT_LIBRARY}
+    PRIVATE
+      time.c threads_posix.c threads_win32.c
+      threads_win32_tls_callback.cpp
+    PUBLIC
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/threads_win32.h>)
diff --git a/source/kit/c11/impl/threads_posix.c b/source/kit/c11/impl/threads_posix.c
new file mode 100644
index 0000000..ebf411c
--- /dev/null
+++ b/source/kit/c11/impl/threads_posix.c
@@ -0,0 +1,313 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ *
+ * Permission is hereby granted, free of charge, to any person or
+ * organization obtaining a copy of the software and accompanying
+ * documentation covered by this license (the "Software") to use,
+ * reproduce, display, distribute, execute, and transmit the Software,
+ * and to prepare [[derivative work]]s of the Software, and to permit
+ * third-parties to whom the Software is furnished to do so, all
+ * subject to the following:
+ *
+ * The copyright notices in the Software and this entire statement,
+ * including the above license grant, this restriction and the
+ * following disclaimer, must be included in all copies of the
+ * Software, in whole or in part, and all derivative works of the
+ * Software, unless such copies or derivative works are solely in the
+ * form of machine-executable object code generated by a source
+ * language processor.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
+ * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
+ * DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef KIT_HAVE_WINDOWS
+
+#  include <assert.h>
+#  include <errno.h>
+#  include <limits.h>
+#  include <sched.h>
+#  include <stdint.h> /* for intptr_t */
+#  include <stdlib.h>
+#  include <unistd.h>
+
+#  include "../threads.h"
+
+/*
+Configuration macro:
+
+  EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+    Use pthread_mutex_timedlock() for `mtx_timedlock()'
+    Otherwise use mtx_trylock() + *busy loop* emulation.
+*/
+#  if !defined(__CYGWIN__) && !defined(__APPLE__) && \
+      !defined(__NetBSD__)
+#    define EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+#  endif
+
+/*---------------------------- types ----------------------------*/
+
+/*
+Implementation limits:
+  - Conditionally emulation for "mutex with timeout"
+    (see EMULATED_THREADS_USE_NATIVE_TIMEDLOCK macro)
+*/
+struct impl_thrd_param {
+  thrd_start_t func;
+  void        *arg;
+};
+
+static void *impl_thrd_routine(void *p) {
+  struct impl_thrd_param pack = *((struct impl_thrd_param *) p);
+  free(p);
+  return (void *) (intptr_t) pack.func(pack.arg);
+}
+
+/*--------------- 7.25.2 Initialization functions ---------------*/
+// 7.25.2.1
+void call_once(once_flag *flag, void (*func)(void)) {
+  pthread_once(flag, func);
+}
+
+/*------------- 7.25.3 Condition variable functions -------------*/
+// 7.25.3.1
+int cnd_broadcast(cnd_t *cond) {
+  assert(cond != NULL);
+  return (pthread_cond_broadcast(cond) == 0) ? thrd_success
+                                             : thrd_error;
+}
+
+// 7.25.3.2
+void cnd_destroy(cnd_t *cond) {
+  assert(cond);
+  pthread_cond_destroy(cond);
+}
+
+// 7.25.3.3
+int cnd_init(cnd_t *cond) {
+  assert(cond != NULL);
+  return (pthread_cond_init(cond, NULL) == 0) ? thrd_success
+                                              : thrd_error;
+}
+
+// 7.25.3.4
+int cnd_signal(cnd_t *cond) {
+  assert(cond != NULL);
+  return (pthread_cond_signal(cond) == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.3.5
+int cnd_timedwait(cnd_t *cond, mtx_t *mtx,
+                  const struct timespec *abs_time) {
+  int rt;
+
+  assert(mtx != NULL);
+  assert(cond != NULL);
+  assert(abs_time != NULL);
+
+  rt = pthread_cond_timedwait(cond, mtx, abs_time);
+  if (rt == ETIMEDOUT)
+    return thrd_timedout;
+  return (rt == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.3.6
+int cnd_wait(cnd_t *cond, mtx_t *mtx) {
+  assert(mtx != NULL);
+  assert(cond != NULL);
+  return (pthread_cond_wait(cond, mtx) == 0) ? thrd_success
+                                             : thrd_error;
+}
+
+/*-------------------- 7.25.4 Mutex functions --------------------*/
+// 7.25.4.1
+void mtx_destroy(mtx_t *mtx) {
+  assert(mtx != NULL);
+  pthread_mutex_destroy(mtx);
+}
+
+/*
+ * XXX: Workaround when building with -O0 and without pthreads link.
+ *
+ * In such cases constant folding and dead code elimination won't be
+ * available, thus the compiler will always add the pthread_mutexattr*
+ * functions into the binary. As we try to link, we'll fail as the
+ * symbols are unresolved.
+ *
+ * Ideally we'll enable the optimisations locally, yet that does not
+ * seem to work.
+ *
+ * So the alternative workaround is to annotate the symbols as weak.
+ * Thus the linker will be happy and things don't clash when building
+ * with -O1 or greater.
+ */
+#  if defined(HAVE_FUNC_ATTRIBUTE_WEAK) && !defined(__CYGWIN__)
+__attribute__((weak)) int pthread_mutexattr_init(
+    pthread_mutexattr_t *attr);
+
+__attribute__((weak)) int pthread_mutexattr_settype(
+    pthread_mutexattr_t *attr, int type);
+
+__attribute__((weak)) int pthread_mutexattr_destroy(
+    pthread_mutexattr_t *attr);
+#  endif
+
+// 7.25.4.2
+int mtx_init(mtx_t *mtx, int type) {
+  pthread_mutexattr_t attr;
+  assert(mtx != NULL);
+  if (type != mtx_plain && type != mtx_timed &&
+      type != (mtx_plain | mtx_recursive) &&
+      type != (mtx_timed | mtx_recursive))
+    return thrd_error;
+
+  if ((type & mtx_recursive) == 0) {
+    pthread_mutex_init(mtx, NULL);
+    return thrd_success;
+  }
+
+  pthread_mutexattr_init(&attr);
+  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+  pthread_mutex_init(mtx, &attr);
+  pthread_mutexattr_destroy(&attr);
+  return thrd_success;
+}
+
+// 7.25.4.3
+int mtx_lock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  return (pthread_mutex_lock(mtx) == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.4.4
+int mtx_timedlock(mtx_t *mtx, const struct timespec *ts) {
+  assert(mtx != NULL);
+  assert(ts != NULL);
+
+  {
+#  ifdef EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+    int rt;
+    rt = pthread_mutex_timedlock(mtx, ts);
+    if (rt == 0)
+      return thrd_success;
+    return (rt == ETIMEDOUT) ? thrd_timedout : thrd_error;
+#  else
+    time_t expire = time(NULL);
+    expire += ts->tv_sec;
+    while (mtx_trylock(mtx) != thrd_success) {
+      time_t now = time(NULL);
+      if (expire < now)
+        return thrd_timedout;
+      // busy loop!
+      thrd_yield();
+    }
+    return thrd_success;
+#  endif
+  }
+}
+
+// 7.25.4.5
+int mtx_trylock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  return (pthread_mutex_trylock(mtx) == 0) ? thrd_success : thrd_busy;
+}
+
+// 7.25.4.6
+int mtx_unlock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  return (pthread_mutex_unlock(mtx) == 0) ? thrd_success : thrd_error;
+}
+
+/*------------------- 7.25.5 Thread functions -------------------*/
+// 7.25.5.1
+int thrd_create(thrd_t *thr, thrd_start_t func, void *arg) {
+  struct impl_thrd_param *pack;
+  assert(thr != NULL);
+  pack = (struct impl_thrd_param *) malloc(
+      sizeof(struct impl_thrd_param));
+  if (!pack)
+    return thrd_nomem;
+  pack->func = func;
+  pack->arg  = arg;
+  if (pthread_create(thr, NULL, impl_thrd_routine, pack) != 0) {
+    free(pack);
+    return thrd_error;
+  }
+  return thrd_success;
+}
+
+// 7.25.5.2
+thrd_t thrd_current(void) {
+  return pthread_self();
+}
+
+// 7.25.5.3
+int thrd_detach(thrd_t thr) {
+  return (pthread_detach(thr) == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.5.4
+int thrd_equal(thrd_t thr0, thrd_t thr1) {
+  return pthread_equal(thr0, thr1);
+}
+
+// 7.25.5.5
+_Noreturn void thrd_exit(int res) {
+  pthread_exit((void *) (intptr_t) res);
+}
+
+// 7.25.5.6
+int thrd_join(thrd_t thr, int *res) {
+  void *code;
+  if (pthread_join(thr, &code) != 0)
+    return thrd_error;
+  if (res)
+    *res = (int) (intptr_t) code;
+  return thrd_success;
+}
+
+// 7.25.5.7
+int thrd_sleep(const struct timespec *time_point,
+               struct timespec       *remaining) {
+  assert(time_point != NULL);
+  return nanosleep(time_point, remaining);
+}
+
+// 7.25.5.8
+void thrd_yield(void) {
+  sched_yield();
+}
+
+/*----------- 7.25.6 Thread-specific storage functions -----------*/
+// 7.25.6.1
+int tss_create(tss_t *key, tss_dtor_t dtor) {
+  assert(key != NULL);
+  return (pthread_key_create(key, dtor) == 0) ? thrd_success
+                                              : thrd_error;
+}
+
+// 7.25.6.2
+void tss_delete(tss_t key) {
+  pthread_key_delete(key);
+}
+
+// 7.25.6.3
+void *tss_get(tss_t key) {
+  return pthread_getspecific(key);
+}
+
+// 7.25.6.4
+int tss_set(tss_t key, void *val) {
+  return (pthread_setspecific(key, val) == 0) ? thrd_success
+                                              : thrd_error;
+}
+
+#endif
diff --git a/source/kit/c11/impl/threads_win32.c b/source/kit/c11/impl/threads_win32.c
new file mode 100644
index 0000000..b94d20f
--- /dev/null
+++ b/source/kit/c11/impl/threads_win32.c
@@ -0,0 +1,460 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ *
+ * Permission is hereby granted, free of charge, to any person or
+ * organization obtaining a copy of the software and accompanying
+ * documentation covered by this license (the "Software") to use,
+ * reproduce, display, distribute, execute, and transmit the Software,
+ * and to prepare [[derivative work]]s of the Software, and to permit
+ * third-parties to whom the Software is furnished to do so, all
+ * subject to the following:
+ *
+ * The copyright notices in the Software and this entire statement,
+ * including the above license grant, this restriction and the
+ * following disclaimer, must be included in all copies of the
+ * Software, in whole or in part, and all derivative works of the
+ * Software, unless such copies or derivative works are solely in the
+ * form of machine-executable object code generated by a source
+ * language processor.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
+ * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
+ * DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifdef KIT_HAVE_WINDOWS
+
+#  include <assert.h>
+#  include <errno.h>
+#  include <limits.h>
+#  include <process.h> // MSVCRT
+#  include <stdbool.h>
+#  include <stdlib.h>
+
+#  include "../threads.h"
+
+#  include "threads_win32.h"
+
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN 1
+#  endif
+#  include <windows.h>
+
+/*
+Configuration macro:
+
+  EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+    Use native WindowsAPI one-time initialization function.
+    (requires WinVista or later)
+    Otherwise emulate by mtx_trylock() + *busy loop* for WinXP.
+
+  EMULATED_THREADS_TSS_DTOR_SLOTNUM
+    Max registerable TSS dtor number.
+*/
+
+#  if _WIN32_WINNT >= 0x0600
+// Prefer native WindowsAPI on newer environment.
+#    if !defined(__MINGW32__)
+#      define EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+#    endif
+#  endif
+#  define EMULATED_THREADS_TSS_DTOR_SLOTNUM \
+    64 // see TLS_MINIMUM_AVAILABLE
+
+// check configuration
+#  if defined(EMULATED_THREADS_USE_NATIVE_CALL_ONCE) && \
+      (_WIN32_WINNT < 0x0600)
+#    error EMULATED_THREADS_USE_NATIVE_CALL_ONCE requires _WIN32_WINNT>=0x0600
+#  endif
+
+static_assert(sizeof(cnd_t) == sizeof(CONDITION_VARIABLE),
+              "The size of cnd_t must equal to CONDITION_VARIABLE");
+static_assert(sizeof(thrd_t) == sizeof(HANDLE),
+              "The size of thrd_t must equal to HANDLE");
+static_assert(sizeof(tss_t) == sizeof(DWORD),
+              "The size of tss_t must equal to DWORD");
+static_assert(sizeof(mtx_t) == sizeof(CRITICAL_SECTION),
+              "The size of mtx_t must equal to CRITICAL_SECTION");
+static_assert(sizeof(once_flag) == sizeof(INIT_ONCE),
+              "The size of once_flag must equal to INIT_ONCE");
+
+/*
+Implementation limits:
+  - Conditionally emulation for "Initialization functions"
+    (see EMULATED_THREADS_USE_NATIVE_CALL_ONCE macro)
+  - Emulated `mtx_timelock()' with mtx_trylock() + *busy loop*
+*/
+
+struct impl_thrd_param {
+  thrd_start_t func;
+  void        *arg;
+  thrd_t       thrd;
+};
+
+struct thrd_state {
+  thrd_t thrd;
+  bool   handle_need_close;
+};
+
+static thread_local struct thrd_state impl_current_thread = { 0 };
+
+static unsigned __stdcall impl_thrd_routine(void *p) {
+  struct impl_thrd_param *pack_p = (struct impl_thrd_param *) p;
+  struct impl_thrd_param  pack;
+  int                     code;
+  impl_current_thread.thrd              = pack_p->thrd;
+  impl_current_thread.handle_need_close = false;
+  memcpy(&pack, pack_p, sizeof(struct impl_thrd_param));
+  free(p);
+  code = pack.func(pack.arg);
+  return (unsigned) code;
+}
+
+static time_t impl_timespec2msec(const struct timespec *ts) {
+  return (ts->tv_sec * 1000U) + (ts->tv_nsec / 1000000L);
+}
+
+static DWORD impl_abs2relmsec(const struct timespec *abs_time) {
+  const time_t    abs_ms = impl_timespec2msec(abs_time);
+  struct timespec now;
+  timespec_get(&now, TIME_UTC);
+  const time_t now_ms = impl_timespec2msec(&now);
+  const DWORD  rel_ms = (abs_ms > now_ms) ? (DWORD) (abs_ms - now_ms)
+                                          : 0;
+  return rel_ms;
+}
+
+#  ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+struct impl_call_once_param {
+  void (*func)(void);
+};
+static BOOL CALLBACK impl_call_once_callback(PINIT_ONCE InitOnce,
+                                             PVOID      Parameter,
+                                             PVOID     *Context) {
+  struct impl_call_once_param *param = (struct impl_call_once_param *)
+      Parameter;
+  (param->func)();
+  ((void) InitOnce);
+  ((void) Context); // suppress warning
+  return TRUE;
+}
+#  endif // ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+
+static struct impl_tss_dtor_entry {
+  tss_t      key;
+  tss_dtor_t dtor;
+} impl_tss_dtor_tbl[EMULATED_THREADS_TSS_DTOR_SLOTNUM];
+
+static int impl_tss_dtor_register(tss_t key, tss_dtor_t dtor) {
+  int i;
+  for (i = 0; i < EMULATED_THREADS_TSS_DTOR_SLOTNUM; i++) {
+    if (!impl_tss_dtor_tbl[i].dtor)
+      break;
+  }
+  if (i == EMULATED_THREADS_TSS_DTOR_SLOTNUM)
+    return 1;
+  impl_tss_dtor_tbl[i].key  = key;
+  impl_tss_dtor_tbl[i].dtor = dtor;
+  return 0;
+}
+
+static void impl_tss_dtor_invoke(void) {
+  int i;
+  for (i = 0; i < EMULATED_THREADS_TSS_DTOR_SLOTNUM; i++) {
+    if (impl_tss_dtor_tbl[i].dtor) {
+      void *val = tss_get(impl_tss_dtor_tbl[i].key);
+      if (val)
+        (impl_tss_dtor_tbl[i].dtor)(val);
+    }
+  }
+}
+
+/*--------------- 7.25.2 Initialization functions ---------------*/
+// 7.25.2.1
+void call_once(once_flag *flag, void (*func)(void)) {
+  assert(flag && func);
+#  ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+  {
+    struct impl_call_once_param param;
+    param.func = func;
+    InitOnceExecuteOnce((PINIT_ONCE) flag, impl_call_once_callback,
+                        (PVOID) &param, NULL);
+  }
+#  else
+  if (InterlockedCompareExchangePointer(
+          (PVOID volatile *) &flag->status, (PVOID) 1, (PVOID) 0) ==
+      0) {
+    (func)();
+    InterlockedExchangePointer((PVOID volatile *) &flag->status,
+                               (PVOID) 2);
+  } else {
+    while (flag->status == 1) {
+      // busy loop!
+      thrd_yield();
+    }
+  }
+#  endif
+}
+
+/*------------- 7.25.3 Condition variable functions -------------*/
+// 7.25.3.1
+int cnd_broadcast(cnd_t *cond) {
+  assert(cond != NULL);
+  WakeAllConditionVariable((PCONDITION_VARIABLE) cond);
+  return thrd_success;
+}
+
+// 7.25.3.2
+void cnd_destroy(cnd_t *cond) {
+  (void) cond;
+  assert(cond != NULL);
+  // do nothing
+}
+
+// 7.25.3.3
+int cnd_init(cnd_t *cond) {
+  assert(cond != NULL);
+  InitializeConditionVariable((PCONDITION_VARIABLE) cond);
+  return thrd_success;
+}
+
+// 7.25.3.4
+int cnd_signal(cnd_t *cond) {
+  assert(cond != NULL);
+  WakeConditionVariable((PCONDITION_VARIABLE) cond);
+  return thrd_success;
+}
+
+// 7.25.3.5
+int cnd_timedwait(cnd_t *cond, mtx_t *mtx,
+                  const struct timespec *abs_time) {
+  assert(cond != NULL);
+  assert(mtx != NULL);
+  assert(abs_time != NULL);
+  const DWORD timeout = impl_abs2relmsec(abs_time);
+  if (SleepConditionVariableCS((PCONDITION_VARIABLE) cond,
+                               (PCRITICAL_SECTION) mtx, timeout))
+    return thrd_success;
+  return (GetLastError() == ERROR_TIMEOUT) ? thrd_timedout
+                                           : thrd_error;
+}
+
+// 7.25.3.6
+int cnd_wait(cnd_t *cond, mtx_t *mtx) {
+  assert(cond != NULL);
+  assert(mtx != NULL);
+  SleepConditionVariableCS((PCONDITION_VARIABLE) cond,
+                           (PCRITICAL_SECTION) mtx, INFINITE);
+  return thrd_success;
+}
+
+/*-------------------- 7.25.4 Mutex functions --------------------*/
+// 7.25.4.1
+void mtx_destroy(mtx_t *mtx) {
+  assert(mtx);
+  DeleteCriticalSection((PCRITICAL_SECTION) mtx);
+}
+
+// 7.25.4.2
+int mtx_init(mtx_t *mtx, int type) {
+  assert(mtx != NULL);
+  if (type != mtx_plain && type != mtx_timed &&
+      type != (mtx_plain | mtx_recursive) &&
+      type != (mtx_timed | mtx_recursive))
+    return thrd_error;
+  InitializeCriticalSection((PCRITICAL_SECTION) mtx);
+  return thrd_success;
+}
+
+// 7.25.4.3
+int mtx_lock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  EnterCriticalSection((PCRITICAL_SECTION) mtx);
+  return thrd_success;
+}
+
+// 7.25.4.4
+int mtx_timedlock(mtx_t *mtx, const struct timespec *ts) {
+  assert(mtx != NULL);
+  assert(ts != NULL);
+  while (mtx_trylock(mtx) != thrd_success) {
+    if (impl_abs2relmsec(ts) == 0)
+      return thrd_timedout;
+    // busy loop!
+    thrd_yield();
+  }
+  return thrd_success;
+}
+
+// 7.25.4.5
+int mtx_trylock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  return TryEnterCriticalSection((PCRITICAL_SECTION) mtx)
+             ? thrd_success
+             : thrd_busy;
+}
+
+// 7.25.4.6
+int mtx_unlock(mtx_t *mtx) {
+  assert(mtx != NULL);
+  LeaveCriticalSection((PCRITICAL_SECTION) mtx);
+  return thrd_success;
+}
+
+void __threads_win32_tls_callback(void) {
+  struct thrd_state *state = &impl_current_thread;
+  impl_tss_dtor_invoke();
+  if (state->handle_need_close) {
+    state->handle_need_close = false;
+    CloseHandle(state->thrd.handle);
+  }
+}
+
+/*------------------- 7.25.5 Thread functions -------------------*/
+// 7.25.5.1
+int thrd_create(thrd_t *thr, thrd_start_t func, void *arg) {
+  struct impl_thrd_param *pack;
+  uintptr_t               handle;
+  assert(thr != NULL);
+  pack = (struct impl_thrd_param *) malloc(
+      sizeof(struct impl_thrd_param));
+  if (!pack)
+    return thrd_nomem;
+  pack->func = func;
+  pack->arg  = arg;
+  handle     = _beginthreadex(NULL, 0, impl_thrd_routine, pack,
+                              CREATE_SUSPENDED, NULL);
+  if (handle == 0) {
+    free(pack);
+    if (errno == EAGAIN || errno == EACCES)
+      return thrd_nomem;
+    return thrd_error;
+  }
+  thr->handle = (void *) handle;
+  pack->thrd  = *thr;
+  ResumeThread((HANDLE) handle);
+  return thrd_success;
+}
+
+// 7.25.5.2
+thrd_t thrd_current(void) {
+  /* GetCurrentThread() returns a pseudo-handle, which we need
+   * to pass to DuplicateHandle(). Only the resulting handle can be
+   * used from other threads.
+   *
+   * Note that neither handle can be compared to the one by
+   * thread_create. Only the thread IDs - as returned by GetThreadId()
+   * and GetCurrentThreadId() can be compared directly.
+   *
+   * Other potential solutions would be:
+   * - define thrd_t as a thread Ids, but this would mean we'd need to
+   * OpenThread for many operations
+   * - use malloc'ed memory for thrd_t. This would imply using TLS for
+   * current thread.
+   *
+   * Neither is particularly nice.
+   *
+   * Life would be much easier if C11 threads had different
+   * abstractions for threads and thread IDs, just like C++11 threads
+   * does...
+   */
+  struct thrd_state *state = &impl_current_thread;
+  if (state->thrd.handle == NULL) {
+    if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
+                         GetCurrentProcess(), &(state->thrd.handle),
+                         0, FALSE, DUPLICATE_SAME_ACCESS)) {
+      abort();
+    }
+    state->handle_need_close = true;
+  }
+  return state->thrd;
+}
+
+// 7.25.5.3
+int thrd_detach(thrd_t thr) {
+  CloseHandle(thr.handle);
+  return thrd_success;
+}
+
+// 7.25.5.4
+int thrd_equal(thrd_t thr0, thrd_t thr1) {
+  return GetThreadId(thr0.handle) == GetThreadId(thr1.handle);
+}
+
+// 7.25.5.5
+_Noreturn void thrd_exit(int res) {
+  _endthreadex((unsigned) res);
+}
+
+// 7.25.5.6
+int thrd_join(thrd_t thr, int *res) {
+  DWORD w, code;
+  if (thr.handle == NULL) {
+    return thrd_error;
+  }
+  w = WaitForSingleObject(thr.handle, INFINITE);
+  if (w != WAIT_OBJECT_0)
+    return thrd_error;
+  if (res) {
+    if (!GetExitCodeThread(thr.handle, &code)) {
+      CloseHandle(thr.handle);
+      return thrd_error;
+    }
+    *res = (int) code;
+  }
+  CloseHandle(thr.handle);
+  return thrd_success;
+}
+
+// 7.25.5.7
+int thrd_sleep(const struct timespec *time_point,
+               struct timespec       *remaining) {
+  (void) remaining;
+  assert(time_point);
+  assert(!remaining); /* not implemented */
+  Sleep((DWORD) impl_timespec2msec(time_point));
+  return 0;
+}
+
+// 7.25.5.8
+void thrd_yield(void) {
+  SwitchToThread();
+}
+
+/*----------- 7.25.6 Thread-specific storage functions -----------*/
+// 7.25.6.1
+int tss_create(tss_t *key, tss_dtor_t dtor) {
+  assert(key != NULL);
+  *key = TlsAlloc();
+  if (dtor) {
+    if (impl_tss_dtor_register(*key, dtor)) {
+      TlsFree(*key);
+      return thrd_error;
+    }
+  }
+  return (*key != 0xFFFFFFFF) ? thrd_success : thrd_error;
+}
+
+// 7.25.6.2
+void tss_delete(tss_t key) {
+  TlsFree(key);
+}
+
+// 7.25.6.3
+void *tss_get(tss_t key) {
+  return TlsGetValue(key);
+}
+
+// 7.25.6.4
+int tss_set(tss_t key, void *val) {
+  return TlsSetValue(key, val) ? thrd_success : thrd_error;
+}
+
+#endif
diff --git a/source/kit/c11/impl/threads_win32.h b/source/kit/c11/impl/threads_win32.h
new file mode 100644
index 0000000..6adf5d2
--- /dev/null
+++ b/source/kit/c11/impl/threads_win32.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2022 Yonggang Luo
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef KIT_C11_IMPL_THREADS_WIN32_H_
+#define KIT_C11_IMPL_THREADS_WIN32_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef KIT_HAVE_WINDOWS
+void __threads_win32_tls_callback(void);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/source/kit/c11/impl/threads_win32_tls_callback.cpp b/source/kit/c11/impl/threads_win32_tls_callback.cpp
new file mode 100644
index 0000000..27874c0
--- /dev/null
+++ b/source/kit/c11/impl/threads_win32_tls_callback.cpp
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2022 Yonggang Luo
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "threads_win32.h"
+
+#ifdef KIT_HAVE_WINDOWS
+
+struct tls_callback {
+  tls_callback() { }
+  ~tls_callback() {
+    __threads_win32_tls_callback();
+  }
+};
+static thread_local tls_callback tls_callback_instance;
+
+#endif
diff --git a/source/kit/c11/impl/time.c b/source/kit/c11/impl/time.c
new file mode 100644
index 0000000..777b976
--- /dev/null
+++ b/source/kit/c11/impl/time.c
@@ -0,0 +1,84 @@
+/*
+ * C11 <time.h> implementation
+ *
+ * (C) Copyright yohhoy 2012.
+ * Copyright 2022 Yonggang Luo
+ * Distributed under the Boost Software License, Version 1.0.
+ *
+ * Permission is hereby granted, free of charge, to any person or
+ * organization obtaining a copy of the software and accompanying
+ * documentation covered by this license (the "Software") to use,
+ * reproduce, display, distribute, execute, and transmit the Software,
+ * and to prepare [[derivative work]]s of the Software, and to permit
+ * third-parties to whom the Software is furnished to do so, all
+ * subject to the following:
+ *
+ * The copyright notices in the Software and this entire statement,
+ * including the above license grant, this restriction and the
+ * following disclaimer, must be included in all copies of the
+ * Software, in whole or in part, and all derivative works of the
+ * Software, unless such copies or derivative works are solely in the
+ * form of machine-executable object code generated by a source
+ * language processor.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
+ * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
+ * DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "time.h"
+
+#ifndef KIT_HAVE_TIMESPEC_GET
+
+#  if defined(_WIN32) && !defined(__CYGWIN__)
+
+#    ifndef WIN32_LEAN_AND_MEAN
+#      define WIN32_LEAN_AND_MEAN 1
+#    endif
+#    include <windows.h>
+
+int timespec_get(struct timespec *ts, int base) {
+/* difference between 1970 and 1601 */
+#    define _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS 116444736000000000ull
+/* 1 tick is 100 nanoseconds */
+#    define _TIMESPEC_IMPL_TICKS_PER_SECONDS 10000000ull
+  if (!ts)
+    return 0;
+  if (base == TIME_UTC) {
+    FILETIME       ft;
+    ULARGE_INTEGER date;
+    LONGLONG       ticks;
+
+    GetSystemTimeAsFileTime(&ft);
+    date.HighPart = ft.dwHighDateTime;
+    date.LowPart  = ft.dwLowDateTime;
+    ticks         = (LONGLONG) (date.QuadPart -
+                        _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS);
+    ts->tv_sec    = ticks / _TIMESPEC_IMPL_TICKS_PER_SECONDS;
+    ts->tv_nsec   = (ticks % _TIMESPEC_IMPL_TICKS_PER_SECONDS) * 100;
+    return base;
+  }
+  return 0;
+#    undef _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS
+#    undef _TIMESPEC_IMPL_TICKS_PER_SECONDS
+}
+
+#  else
+
+int timespec_get(struct timespec *ts, int base) {
+  if (!ts)
+    return 0;
+  if (base == TIME_UTC) {
+    clock_gettime(CLOCK_REALTIME, ts);
+    return base;
+  }
+  return 0;
+}
+#  endif
+
+#endif /* KIT_HAVE_TIMESPEC_GET */
diff --git a/source/kit/c11/threads.h b/source/kit/c11/threads.h
new file mode 100644
index 0000000..be6bc2d
--- /dev/null
+++ b/source/kit/c11/threads.h
@@ -0,0 +1,190 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Copyright 2022 Yonggang Luo
+ * Distributed under the Boost Software License, Version 1.0.
+ *
+ * Permission is hereby granted, free of charge, to any person or
+ * organization obtaining a copy of the software and accompanying
+ * documentation covered by this license (the "Software") to use,
+ * reproduce, display, distribute, execute, and transmit the Software,
+ * and to prepare [[derivative work]]s of the Software, and to permit
+ * third-parties to whom the Software is furnished to do so, all
+ * subject to the following:
+ *
+ * The copyright notices in the Software and this entire statement,
+ * including the above license grant, this restriction and the
+ * following disclaimer, must be included in all copies of the
+ * Software, in whole or in part, and all derivative works of the
+ * Software, unless such copies or derivative works are solely in the
+ * form of machine-executable object code generated by a source
+ * language processor.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
+ * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
+ * DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef KIT_C11_THREADS_H_INCLUDED_
+#define KIT_C11_THREADS_H_INCLUDED_
+
+#include "time.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#  include <io.h>      /* close */
+#  include <process.h> /* _exit */
+#elif defined(KIT_HAVE_PTHREAD)
+#  include <pthread.h>
+#  include <unistd.h> /* close, _exit */
+#else
+#  error Not supported on this platform.
+#endif
+
+/*---------------------------- macros ---------------------------*/
+
+#ifndef _Thread_local
+#  if defined(__cplusplus)
+/* C++11 doesn't need `_Thread_local` keyword or macro */
+#  elif !defined(__STDC_NO_THREADS__)
+/* threads are optional in C11, _Thread_local present in this
+ * condition */
+#  elif defined(_MSC_VER)
+#    define _Thread_local __declspec(thread)
+#  elif defined(__GNUC__)
+#    define _Thread_local __thread
+#  else
+/* Leave _Thread_local undefined so that use of _Thread_local would
+ * not promote to a non-thread-local global variable
+ */
+#  endif
+#endif
+
+#if !defined(__cplusplus)
+/*
+ * C11 thread_local() macro
+ * C++11 and above already have thread_local keyword
+ */
+#  ifndef thread_local
+#    define thread_local _Thread_local
+#  endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*---------------------------- types ----------------------------*/
+typedef void (*tss_dtor_t)(void *);
+typedef int (*thrd_start_t)(void *);
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+typedef struct {
+  void *Ptr;
+} cnd_t;
+/* Define thrd_t as struct type intentionally for avoid use of thrd_t
+ * as pointer type */
+typedef struct {
+  void *handle;
+} thrd_t;
+typedef unsigned long tss_t;
+typedef struct {
+  void     *DebugInfo;
+  long      LockCount;
+  long      RecursionCount;
+  void     *OwningThread;
+  void     *LockSemaphore;
+  uintptr_t SpinCount;
+} mtx_t; /* Mock of CRITICAL_SECTION */
+typedef struct {
+  volatile uintptr_t status;
+} once_flag;
+// FIXME: temporary non-standard hack to ease transition
+#  define KIT_MTX_INITIALIZER_NP_ \
+    { (void *) -1, -1, 0, 0, 0, 0 }
+#  define ONCE_FLAG_INIT \
+    { 0 }
+#  define TSS_DTOR_ITERATIONS 1
+#elif defined(KIT_HAVE_PTHREAD)
+typedef pthread_cond_t  cnd_t;
+typedef pthread_t       thrd_t;
+typedef pthread_key_t   tss_t;
+typedef pthread_mutex_t mtx_t;
+typedef pthread_once_t  once_flag;
+// FIXME: temporary non-standard hack to ease transition
+#  define KIT_MTX_INITIALIZER_NP_ PTHREAD_MUTEX_INITIALIZER
+#  define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
+#  ifdef PTHREAD_DESTRUCTOR_ITERATIONS
+#    define TSS_DTOR_ITERATIONS PTHREAD_DESTRUCTOR_ITERATIONS
+#  else
+#    define TSS_DTOR_ITERATIONS \
+      1 // assume TSS dtor MAY be called at least once.
+#  endif
+#else
+#  error Not supported on this platform.
+#endif
+
+/*-------------------- enumeration constants --------------------*/
+enum {
+  mtx_plain     = 0,
+  mtx_recursive = 1,
+  mtx_timed     = 2,
+};
+
+enum {
+  thrd_success = 0, // succeeded
+  thrd_timedout,    // timed out
+  thrd_error,       // failed
+  thrd_busy,        // resource busy
+  thrd_nomem        // out of memory
+};
+
+/*-------------------------- functions --------------------------*/
+
+void   call_once(once_flag *, void (*)(void));
+int    cnd_broadcast(cnd_t *);
+void   cnd_destroy(cnd_t *);
+int    cnd_init(cnd_t *);
+int    cnd_signal(cnd_t *);
+int    cnd_timedwait(cnd_t *__restrict, mtx_t *__restrict mtx_,
+                     const struct timespec *__restrict);
+int    cnd_wait(cnd_t *, mtx_t *mtx_);
+void   mtx_destroy(mtx_t *mtx_);
+int    mtx_init(mtx_t *mtx_, int);
+int    mtx_lock(mtx_t *mtx_);
+int    mtx_timedlock(mtx_t *__restrict mtx_,
+                     const struct timespec *__restrict);
+int    mtx_trylock(mtx_t *mtx_);
+int    mtx_unlock(mtx_t *mtx_);
+int    thrd_create(thrd_t *, thrd_start_t, void *);
+thrd_t thrd_current(void);
+int    thrd_detach(thrd_t);
+int    thrd_equal(thrd_t, thrd_t);
+#if defined(__cplusplus)
+[[ noreturn ]]
+#else
+_Noreturn
+#endif
+void thrd_exit(int);
+int   thrd_join(thrd_t, int *);
+int   thrd_sleep(const struct timespec *, struct timespec *);
+void  thrd_yield(void);
+int   tss_create(tss_t *, tss_dtor_t);
+void  tss_delete(tss_t);
+void *tss_get(tss_t);
+int   tss_set(tss_t, void *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* KIT_C11_THREADS_H_INCLUDED_ */
diff --git a/source/kit/c11/time.h b/source/kit/c11/time.h
new file mode 100644
index 0000000..7467a33
--- /dev/null
+++ b/source/kit/c11/time.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2022 Yonggang Luo
+ * SPDX-License-Identifier: MIT
+ *
+ * C11 <time.h> emulation library
+ */
+
+#ifndef KIT_C11_TIME_H_INCLUDED_
+#define KIT_C11_TIME_H_INCLUDED_
+
+#include <time.h>
+
+/*---------------------------- macros ---------------------------*/
+
+#ifndef TIME_UTC
+#  define TIME_UTC 1
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*---------------------------- types ----------------------------*/
+
+/*
+ * On MINGW `struct timespec` present but `timespec_get` may not
+ * present; On MSVC `struct timespec` and `timespec_get` present at
+ * the same time; So detecting `HAVE_STRUCT_TIMESPEC` in meson script
+ * dynamically.
+ */
+#ifndef KIT_HAVE_STRUCT_TIMESPEC
+struct timespec {
+  time_t tv_sec;  // Seconds - >= 0
+  long   tv_nsec; // Nanoseconds - [0, 999999999]
+};
+#endif
+
+/*-------------------------- functions --------------------------*/
+
+#if !defined(KIT_HAVE_TIMESPEC_GET)
+#  define KIT_HAVE_TIMESPEC_GET_NEED_DECL_
+#elif defined(__APPLE__) && defined(__cplusplus) && \
+    (__cplusplus < 201703L)
+/* On macOS, the guard for declaration of timespec_get is by
+ * (defined(__cplusplus) && __cplusplus >= 201703L),
+ * fix the declaration for C++14 and lower here
+ */
+#  define KIT_HAVE_TIMESPEC_GET_NEED_DECL_
+#endif
+
+#ifdef KIT_HAVE_TIMESPEC_GET_NEED_DECL_
+/*-------------------- 7.25.7 Time functions --------------------*/
+// 7.25.6.1
+int timespec_get(struct timespec *ts, int base);
+#  undef KIT_HAVE_TIMESPEC_GET_NEED_DECL_
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* KIT_C11_TIME_H_INCLUDED_ */
diff --git a/source/kit/mersenne_twister_64.h b/source/kit/mersenne_twister_64.h
index 605a25f..416ef27 100644
--- a/source/kit/mersenne_twister_64.h
+++ b/source/kit/mersenne_twister_64.h
@@ -23,7 +23,7 @@ uint64_t kit_mt64_generate(kit_mt64_state_t *state);
 
 uint64_t kit_mt64_seed();
 
-#ifndef LAPLACE_DISABLE_SHORT_NAMES
+#ifndef KIT_DISABLE_SHORT_NAMES
 #  define mt64_state_t kit_mt64_state_t
 #  define mt64_init kit_mt64_init
 #  define mt64_generate kit_mt64_generate
diff --git a/source/test/unittests/c11_threads.c b/source/test/unittests/c11_threads.c
new file mode 100644
index 0000000..cd50846
--- /dev/null
+++ b/source/test/unittests/c11_threads.c
@@ -0,0 +1,6 @@
+#include "../../kit/c11/threads.h"
+
+#define KIT_TEST_FILE atomic
+#include "../../kit_test/test.h"
+
+TEST("c11 threads") { }