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#include "stdafx.h"
#include "WorkLimiter.h"
CWorkLimiter::CWorkLimiter()
: m_done()
, m_tickLimit()
, m_prevTicks()
{
}
CWorkLimiter::~CWorkLimiter()
{
}
void CWorkLimiter::Start(ULONGLONG ticks)
{
ULONGLONG start = CWorkLimiter::Now();
m_done = false;
m_tickLimit = start + ticks;
m_prevTicks = start;
}
bool CWorkLimiter::IsDone() const
{
if (m_done) return true;
// check remaining ticks
ULONGLONG now = CWorkLimiter::Now();
// signed subtraction to deal with overflow
ULONGLONG remaining = m_tickLimit - now;
if (remaining <= 0)
{
m_done = true;
return true;
}
// check if there are any pending window messages
ULONGLONG elapsed = now - m_prevTicks;
if (elapsed > 10)
{
m_prevTicks = now;
MSG msg;
if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE | PM_QS_INPUT))
{
m_done = true;
return true;
}
}
return false;
}
inline ULONGLONG CWorkLimiter::Now()
{
return _GetTickCount64();
}
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