// gcc -mno-cygwin -Wall suspend.cpp -o suspend_mingw.exe -lstdc++
// cl /EHsc /Zi /I C:/cygwin/usr/local/tools/i686_win32/vc7/Vc7/include /I C:/cygwin/usr/local/tools/i686_win32/vc7/Vc7/PlatformSDK/Include suspend.cpp /link /libpath:C:/cygwin/usr/local/tools/i686_win32/vc7/Vc7/lib /libpath:C:/cygwin/usr/local/tools/i686_win32/vc7/Vc7/PlatformSDK/Lib

#include <windows.h>
#include <iostream>

struct counter {
    int count;
    int done;
};

DWORD WINAPI Counter(LPVOID addr)
{
    counter *c = reinterpret_cast<counter *>(addr);

    while (!c->done) {
        ++c->count;
    }
    return c->count;
}

int main(int argc, char *argv[])
{
    counter c = { 0, 0 };
    DWORD id;

    HANDLE h = CreateThread(NULL, 0, Counter, &c, 0, &id);
    if (h == NULL) {
        std::cerr << "CreateThread():  " << GetLastError() << std::endl;
        exit(1);
    }

    Sleep(1000);

    if (SuspendThread(h) < 0) {
        std::cerr << "SuspendThread():  " << GetLastError() << std::endl;
        exit(1);
    }
    int early = c.count;
    Sleep(1000);
    int late = c.count;
    c.done = 1;
    if (ResumeThread(h) < 0) {
        std::cerr << "ResumeThread():  " << GetLastError() << std::endl;
        exit(1);
    }

    DWORD final;
    if (!GetExitCodeThread(h, &final)) {
        std::cerr << "GetExitCodeThread():  " << GetLastError() << std::endl;
        exit(1);
    }

    if (early != late) {
        std::cout << early << ", " << late << std::endl;
        exit(2);
    }

    // If I just put "return 0;" here, I get random crashes in the exit
    // code when I run three parallel "repeat 100 suspend.exe" jobs.
    exit(0);
}