ResumeThread on POSIX

Hi all

How i can create thread in SUSPENDED mode, and resume when i want.

I have win code with CreateThread (parameter CREATE_SUSPEND), and Resume Thread, but on POSIX with pthread i cant do it.

Please help me.
Best regards
// Kolesar

pthread_suspend()
pthread_continue()

?? will these not work?

pthread_suspend() is not portable,

You may try pthread_cond_wait() or pthread_cond_timedwait()

Hi all

thanks for answers

I try with pthread_cond_*, but i have callback function and i have a big problem.

void auto_event::set() 
{
#if _WIN32
    assert(m_evt);
    if (!::SetEvent(m_evt))
    {
        // error out
    }
#elif _LINUX

    if(m_count == 0)
    {
        m_count = 1;
        if(::pthread_cond_signal(&m_cond) != 0)
            {
                // error out
            }
    }
#endif
}

void auto_event::wait() 
{
#if _WIN32
    assert(m_evt);
    if (::WaitForSingleObject(m_evt, INFINITE) == WAIT_FAILED)
    {
        // error out
    }
#elif _LINUX
    if(m_count == 0)
    {
        if(::pthread_cond_wait(&m_cond, &m_mutex) != 0)
        {
            // error out
        }
    }
    m_count = 0;
#endif
}

/// for callback function
int auto_event::wait(auto_event::auto_event_impl* other) 
{
    int result=-1;

#if _WIN32
    assert(m_evt);
    assert(other->m_evt);

    const HANDLE objs[2] = { m_evt, other->m_evt };
    DWORD wmo = ::WaitForMultipleObjects(2, objs, FALSE, INFINITE);
    switch (wmo)
    {
    case WAIT_FAILED:
        // error out
    case WAIT_IO_COMPLETION:
        // error out
    case WAIT_TIMEOUT:
        // error out
    case WAIT_ABANDONED_0:
    case WAIT_ABANDONED_0 + 1:
        // error out
    case WAIT_OBJECT_0:
    case WAIT_OBJECT_0 + 1:
        result = static_cast<int>(wmo - WAIT_OBJECT_0);
        break;
    default:
        // error out
    }
    return result;
#elif _LINUX
        int rc = 0;
    while (rc == 0)
        rc = pthread_cond_wait(&m_cond, &m_mutex);
    if (rc == 0)
    {
        return 0;
    }
    rc = 0;
    while (rc == 0)
        rc = pthread_cond_wait(&other->m_cond, &other->m_mutex);
    if (rc == 0)
    {
        return 1;
    }
#endif
}

void auto_event::lock() const
{
    if(::pthread_mutex_lock((pthread_mutex_t*)&m_mutex) !=0)
    {
        // error out
    }
}

void auto_event::unlock() const
{
    if(::pthread_mutex_unlock((pthread_mutex_t*)&m_mutex) !=0)
    {
        // error out
    }
}

void auto_event::lock(auto_event::auto_event_impl* other) const
{
    if(::pthread_mutex_lock((pthread_mutex_t*)&other->m_mutex) !=0)
    {
        // error out
    }
}

void auto_event::unlock(auto_event::auto_event_impl* other) const
{
    if(::pthread_mutex_unlock((pthread_mutex_t*)&other->m_mutex) !=0)
    {
        // error out
    }
}

I don't know how to correct write

auto_event::wait(auto_event::auto_event_impl* other)

function.
Please help.

BR
// Kolesar

Hi again

I try with semaphore. Program is working, but very very slowly :S

void auto_event::set()
{
#if _WIN32
    assert(m_evt);
    if (!::SetEvent(m_evt))
    {
        // error out
    }
#elif _LINUX
    int ret=0;
    if ((ret=sem_post(&(this->sem))) != 0) {
        printf("sem_post return error:[%d]\n", ret);
    }
#endif
}

void auto_event::wait()
{
#if _WIN32
    assert(m_evt);
    if (::WaitForSingleObject(m_evt, INFINITE) == WAIT_FAILED)
    {
        // error out
    }
#elif _LINUX
    if((ret=sem_wait(&(this->sem))) != 0)
        printf("error\n");
#endif
}

/// for callback function
int auto_event::wait(auto_event::auto_event_impl* other)
{
    int result=-1;

#if _WIN32
    assert(m_evt);
    assert(other->m_evt);

    const HANDLE objs[2] = { m_evt, other->m_evt };
    DWORD wmo = ::WaitForMultipleObjects(2, objs, FALSE, INFINITE);
    switch (wmo)
    {
    case WAIT_FAILED:
        // error out
    case WAIT_IO_COMPLETION:
        // error out
    case WAIT_TIMEOUT:
        // error out
    case WAIT_ABANDONED_0:
    case WAIT_ABANDONED_0 + 1:
        // error out
    case WAIT_OBJECT_0:
    case WAIT_OBJECT_0 + 1:
        result = static_cast<int>(wmo - WAIT_OBJECT_0);
        break;
    default:
        // error out
    }
    return result;
#elif _LINUX
    int milliseconds = 2001;
    struct timespec timeout;
    timeout.tv_sec = time(NULL) + milliseconds / 1000;
    timeout.tv_nsec = (milliseconds % 1000) * 1000000;
    
    if(sem_trywait(&(this->m_sem)) == 0)
        result = 0;

    if(errno == EINVAL || errno == EINTR)
    {    /*error*/}

    if(sem_trywait(&(other->m_sem)) == 0)
        result = 1;

    if(errno == EINVAL || errno == EINTR)
    {    /*error*/}
#endif
}

Please help me.

BR
// Kolesar

This code cannot compile by itself. Do you have the rest? Or could you make a reduced, complete program that displays the same problem?

I do not know what your timeout code is supposed to do there. You're just creating a variable and setting values in it but not actually using the variable to do anything.