add source code

CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(sdl-thread LANGUAGES C)
+
+find_package(SDL2 REQUIRED)
+add_executable(sdl-thread main.c)
+
+include(GNUInstallDirs)
+install(TARGETS sdl-thread
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE SDL2::SDL2)

main.c

@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <SDL2/SDL.h>
+
+
+SDL_mutex *s_lock = NULL;
+SDL_cond *s_cond = NULL;
+
+int work_thread(void *arg) {
+    SDL_LockMutex(s_lock);
+    printf("<=========work_thread sleep=========>\n");
+    sleep(10);
+    printf("<=========work_thread wait condition=========>\n");
+    SDL_CondWait(s_cond, s_lock);
+    printf("<=========work_thread receive signal=========>\n");
+    printf("<=========work_thread end=========>\n");
+    SDL_UnlockMutex(s_lock);
+
+    return 0;
+}
+
+#undef main
+int main()
+{
+    s_lock = SDL_CreateMutex();
+    s_cond = SDL_CreateCond();
+    SDL_Thread *t = SDL_CreateThread(work_thread, "work_thread", NULL);
+
+    if (!t) {
+        printf("SDL_CreateThread() failed\n");
+        return -1;
+    }
+
+    for (int i = 0; i < 2; i++) {
+        sleep(2);
+        printf("main execute\n");
+    }
+
+    printf("SDL_LockMutex(s_lock) before\n");
+    SDL_LockMutex(s_lock);
+    printf("SDL_LockMutex(s_lock) after\n");
+    printf("SDL_CondSignal(s_cond) before\n");
+    SDL_CondSignal(s_cond);
+    printf("SDL_CondSignal(s_cond) after\n");
+    sleep(10);
+    printf("SDL_UnlockMutex(s_lock) before\n");
+    SDL_UnlockMutex(s_lock);
+    printf("SDL_UnlockMutex(s_lock) after\n");
+
+    SDL_WaitThread(t, NULL);
+    SDL_DestroyMutex(s_lock);
+    SDL_DestroyCond(s_cond);
+
+    return 0;
+}