build: Add CMake support for thread-local RNG feature

Updates build system to support thread-local RNG compilation:

- Add PS_THREAD_LOCAL_RNG option (enabled by default)
- Detect compiler support for thread-local storage
- Configure PS_USE_THREAD_LOCAL_RNG macro when enabled
- Add thread utilities library for tests
- Register new test executables with CTest
- Link tests with thread utilities and pthread where needed

The feature can be disabled with -DPS_THREAD_LOCAL_RNG=OFF if
thread-local storage is not available or desired.

CMakeLists.txt

@@ -63,6 +63,37 @@ if(NOT DEFAULT_RADIX)
 endif()
 cmake_print_variables(FIXED_POINT DEFAULT_RADIX)
 
+option(PS_THREAD_LOCAL_RNG "Use thread-local storage for random number generator" ON)
+if(PS_THREAD_LOCAL_RNG)
+  # Test for thread-local storage support
+  include(CheckCSourceCompiles)
+  check_c_source_compiles("
+    _Thread_local int x;
+    int main() { x = 42; return 0; }
+  " HAVE_C11_THREAD_LOCAL)
+
+  check_c_source_compiles("
+    __thread int x;
+    int main() { x = 42; return 0; }
+  " HAVE_GCC_THREAD_LOCAL)
+
+  check_c_source_compiles("
+    __declspec(thread) int x;
+    int main() { x = 42; return 0; }
+  " HAVE_MSVC_THREAD_LOCAL)
+
+  if(HAVE_C11_THREAD_LOCAL OR HAVE_GCC_THREAD_LOCAL OR HAVE_MSVC_THREAD_LOCAL)
+    add_definitions(-DPS_USE_THREAD_LOCAL_RNG)
+    message(STATUS "Thread-local storage support: ENABLED")
+  else()
+    message(WARNING "Thread-local storage not supported on this compiler. Disabling PS_THREAD_LOCAL_RNG")
+    set(PS_THREAD_LOCAL_RNG OFF)
+  endif()
+else()
+  message(STATUS "Thread-local storage support: DISABLED")
+endif()
+cmake_print_variables(PS_THREAD_LOCAL_RNG)
+
 # Maybe not a great idea, but it does work on both Windows and Linux
 set (CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

config.h.in

@@ -6,6 +6,9 @@
 /* Define to use fixed-point computation */
 #cmakedefine FIXED_POINT
 
+/* Define to use thread-local storage for random number generator */
+#cmakedefine PS_USE_THREAD_LOCAL_RNG
+
 /* Define if the system has the type `long long'. */
 #cmakedefine HAVE_LONG_LONG
 

test/unit/CMakeLists.txt

@@ -1,4 +1,8 @@
 configure_file(test_macros.h.in test_macros.h @ONLY)
+
+# Build thread utilities as a library
+add_library(test_thread_utils STATIC test_thread_utils.c)
+target_include_directories(test_thread_utils PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 set(TESTS
   test_acmod
   test_acmod_grow
@@ -33,6 +37,12 @@ set(TESTS
   test_vad
   test_word_align
   test_endpointer
+  test_thread_local_compile
+  test_thread_local_basic
+  test_thread_utils_self
+  test_genrand_baseline
+  test_genrand_thread
+  test_genrand_thread_tls
   )
 foreach(TEST_EXECUTABLE ${TESTS})
   add_executable(${TEST_EXECUTABLE} EXCLUDE_FROM_ALL ${TEST_EXECUTABLE}.c)
@@ -46,6 +56,20 @@ foreach(TEST_EXECUTABLE ${TESTS})
   add_dependencies(check ${TEST_EXECUTABLE})
 endforeach()
 
+# Some tests need thread utilities and pthread support
+if(NOT WIN32)
+  find_package(Threads REQUIRED)
+  target_link_libraries(test_thread_local_basic ${CMAKE_THREAD_LIBS_INIT})
+  target_link_libraries(test_thread_utils ${CMAKE_THREAD_LIBS_INIT})
+endif()
+
+# test_thread_utils_self needs the thread utilities library
+target_link_libraries(test_thread_utils_self test_thread_utils)
+
+# test_genrand_thread needs thread utilities
+target_link_libraries(test_genrand_thread test_thread_utils)
+target_link_libraries(test_genrand_thread_tls test_thread_utils)
+
 add_subdirectory(test_alloc)
 add_subdirectory(test_case)
 add_subdirectory(test_feat)