Add thread support

CMakeLists.txt

@@ -5,8 +5,12 @@ project(bhlib LANGUAGES C)
 set(CMAKE_C_STANDARD 90)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 
-# Check for IPO/LTO
+# Project includes
 include(CheckIPOSupported)
+include(CheckIncludeFile)
+include(CheckSymbolExists)
+
+# Check for IPO/LTO
 check_ipo_supported(RESULT supported)
 
 if(supported)
@@ -23,6 +27,7 @@ set(BHLIB_SOURCE
     src/algo.c
     src/hashmap.c
     src/queue.c
+    src/thread.c
 )
 
 set(BHLIB_HEADER
@@ -31,9 +36,59 @@ set(BHLIB_HEADER
     include/bh/queue.h
 )
 
+set(BHLIB_INCLUDE_DIRS
+    include
+    ${PROJECT_BINARY_DIR}/include
+)
+
+
+# Determine platform
+if(WIN32)
+    message(STATUS "Platform - Win32")
+
+    # Check multithreading support
+    check_symbol_exists(_beginthread process.h BHLIB_USE_WINTHREAD)
+    if(BHLIB_USE_WINTHREAD)
+        message(STATUS "Multithreading enabled")
+        list(APPEND BHLIB_SOURCE
+            src/thread_win.c
+        )
+    else()
+        message(STATUS "Multithreading disabled")
+        list(APPEND BHLIB_SOURCE
+            src/thread_null.c
+        )
+    endif()
+elseif(UNIX)
+    message(STATUS "Platform: Unix (Linux/BSD/MacOS X)")
+
+    # Check multithreading support
+    check_include_file(pthread.h BHLIB_USE_PTHREAD)
+    if(BHLIB_USE_PTHREAD)
+        message(STATUS "Multithreading enabled")
+        list(APPEND BHLIB_SOURCE
+            src/thread_posix.c
+        )
+    else()
+        message(STATUS "Multithreading disabled")
+        list(APPEND BHLIB_SOURCE
+            src/thread_null.c
+        )
+    endif()
+else()
+    message(STATUS "Platform: Unknown")
+    message(STATUS "Multithreading disabled")
+    list(APPEND BHLIB_SOURCE
+        src/thread_null.c
+    )
+endif()
+
+# Configure library
+configure_file(include/bh/config.in include/bh/config.h)
+
 # Library
 add_library(bhlib STATIC ${BHLIB_SOURCE} ${BHLIB_HEADER})
-target_include_directories(bhlib PUBLIC include)
+target_include_directories(bhlib PUBLIC ${BHLIB_INCLUDE_DIRS})
 
 # Runtime definition
 add_executable(main