Simple Thread Windows

main.cpp

#include <stdio.h.>

#include <windows.h>
#include <processthreadsapi.h>

DWORD WINAPI ThreadFn(PVOID param);

struct Inner {
    const char* innerName;
    int result;
    void (*print)(const Inner*);
};

void PrintInner(const Inner* inner) {
    printf("Name: %s Result: %d\n", inner->innerName, inner->result);
}

int main(void) {
    printf("Main TID: (%lu)\n", GetCurrentThreadId());

    Inner inner;
    inner.innerName = "It's a inner BOI";
    inner.print = PrintInner;

    DWORD tid;
    HANDLE thread = CreateThread(NULL, 0, ThreadFn, &inner, CREATE_SUSPENDED, &tid);

    printf("Thread %lu was created in a suspended state\n", tid);
    Sleep(500);

    ResumeThread(thread);

    WaitForSingleObject(thread, INFINITE);

    DWORD exitCode;
    if (!GetExitCodeThread(thread, &exitCode)) {
        printf("GetExitCodeThread Error: %lu\n", GetLastError());
    }
    printf("Thread TID: (%lu) exited with code: (%lu)\n", tid, exitCode);

    CloseHandle(thread);

    inner.print(&inner);

    return EXIT_SUCCESS;
}

DWORD WINAPI ThreadFn(PVOID param) {
    Sleep(1000);

    Inner* inner = (Inner*)param;
    inner->result = 42;
    inner->print(inner);

    Sleep(1000);
    return 0;
}