Tests for nxdk InitOnce* API

gistfile1.txt

#include <assert.h>
#include <hal/debug.h>
#include <hal/video.h>
#include <windows.h>

// expected output:
// > failing function running
// > failing function running
// > succeeding function running
// > tests done

BOOL CALLBACK initOnceFnFailing (PINIT_ONCE initOnce, PVOID Parameter, PVOID *Context)
{
    debugPrint("failing function running\n");
    return FALSE;
}

BOOL CALLBACK initOnceFnSucceeding (PINIT_ONCE initOnce, PVOID Parameter, PVOID *Context)
{
    debugPrint("succeeding function running\n");
    return TRUE;
}

int main(void)
{
    XVideoSetMode(640, 480, 32, REFRESH_DEFAULT);

    INIT_ONCE initOnce = INIT_ONCE_STATIC_INIT;

    BOOL ret;

    // these asserts were written after experiments on Windows 7 + VS 2017
    ret = InitOnceExecuteOnce(&initOnce, initOnceFnFailing, NULL, NULL);
    assert(ret == FALSE);
    assert(GetLastError() == 0);

    ret = InitOnceExecuteOnce(&initOnce, initOnceFnFailing, NULL, NULL);
    assert(ret == FALSE);
    assert(GetLastError() == 0);

    ret = InitOnceExecuteOnce(&initOnce, initOnceFnSucceeding, NULL, NULL);
    assert(ret == TRUE);

    // It's already initialized, so we get TRUE, but the function doesn't run
    ret = InitOnceExecuteOnce(&initOnce, initOnceFnSucceeding, NULL, NULL);
    assert(ret == TRUE);

    debugPrint("tests done\n");

    while(1) {
        Sleep(2000);
    }

    return 0;
}