285 lines
7.8 KiB
C++
285 lines
7.8 KiB
C++
//------------------------------------------------------------------------------
|
|
// File: Schedule.cpp
|
|
//
|
|
// Desc: DirectShow base classes.
|
|
//
|
|
// Copyright (c) 1996-2001 Microsoft Corporation. All rights reserved.
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
#include <streams.h>
|
|
|
|
// DbgLog values (all on LOG_TIMING):
|
|
//
|
|
// 2 for schedulting, firing and shunting of events
|
|
// 3 for wait delays and wake-up times of event thread
|
|
// 4 for details of whats on the list when the thread awakes
|
|
|
|
/* Construct & destructors */
|
|
|
|
CAMSchedule::CAMSchedule( HANDLE ev )
|
|
: CBaseObject(TEXT("CAMSchedule"))
|
|
, head(&z, 0), z(0, MAX_TIME)
|
|
, m_dwNextCookie(0), m_dwAdviseCount(0)
|
|
, m_pAdviseCache(0), m_dwCacheCount(0)
|
|
, m_ev( ev )
|
|
{
|
|
head.m_dwAdviseCookie = z.m_dwAdviseCookie = 0;
|
|
}
|
|
|
|
CAMSchedule::~CAMSchedule()
|
|
{
|
|
m_Serialize.Lock();
|
|
|
|
// Delete cache
|
|
CAdvisePacket * p = m_pAdviseCache;
|
|
while (p)
|
|
{
|
|
CAdvisePacket *const p_next = p->m_next;
|
|
delete p;
|
|
p = p_next;
|
|
}
|
|
|
|
ASSERT( m_dwAdviseCount == 0 );
|
|
// Better to be safe than sorry
|
|
if ( m_dwAdviseCount > 0 )
|
|
{
|
|
DumpLinkedList();
|
|
while ( !head.m_next->IsZ() )
|
|
{
|
|
head.DeleteNext();
|
|
--m_dwAdviseCount;
|
|
}
|
|
}
|
|
|
|
// If, in the debug version, we assert twice, it means, not only
|
|
// did we have left over advises, but we have also let m_dwAdviseCount
|
|
// get out of sync. with the number of advises actually on the list.
|
|
ASSERT( m_dwAdviseCount == 0 );
|
|
|
|
m_Serialize.Unlock();
|
|
}
|
|
|
|
/* Public methods */
|
|
|
|
DWORD CAMSchedule::GetAdviseCount()
|
|
{
|
|
// No need to lock, m_dwAdviseCount is 32bits & declared volatile
|
|
return m_dwAdviseCount;
|
|
}
|
|
|
|
REFERENCE_TIME CAMSchedule::GetNextAdviseTime()
|
|
{
|
|
CAutoLock lck(&m_Serialize); // Need to stop the linked list from changing
|
|
return head.m_next->m_rtEventTime;
|
|
}
|
|
|
|
DWORD_PTR CAMSchedule::AddAdvisePacket
|
|
( const REFERENCE_TIME & time1
|
|
, const REFERENCE_TIME & time2
|
|
, HANDLE h, BOOL periodic
|
|
)
|
|
{
|
|
// Since we use MAX_TIME as a sentry, we can't afford to
|
|
// schedule a notification at MAX_TIME
|
|
ASSERT( time1 < MAX_TIME );
|
|
DWORD_PTR Result;
|
|
CAdvisePacket * p;
|
|
|
|
m_Serialize.Lock();
|
|
|
|
if (m_pAdviseCache)
|
|
{
|
|
p = m_pAdviseCache;
|
|
m_pAdviseCache = p->m_next;
|
|
--m_dwCacheCount;
|
|
}
|
|
else
|
|
{
|
|
p = new CAdvisePacket();
|
|
}
|
|
if (p)
|
|
{
|
|
p->m_rtEventTime = time1; p->m_rtPeriod = time2;
|
|
p->m_hNotify = h; p->m_bPeriodic = periodic;
|
|
Result = AddAdvisePacket( p );
|
|
}
|
|
else Result = 0;
|
|
|
|
m_Serialize.Unlock();
|
|
|
|
return Result;
|
|
}
|
|
|
|
HRESULT CAMSchedule::Unadvise(DWORD_PTR dwAdviseCookie)
|
|
{
|
|
HRESULT hr = S_FALSE;
|
|
CAdvisePacket * p_prev = &head;
|
|
CAdvisePacket * p_n;
|
|
m_Serialize.Lock();
|
|
while ( p_n = p_prev->Next() ) // The Next() method returns NULL when it hits z
|
|
{
|
|
if ( p_n->m_dwAdviseCookie == dwAdviseCookie )
|
|
{
|
|
Delete( p_prev->RemoveNext() );
|
|
--m_dwAdviseCount;
|
|
hr = S_OK;
|
|
// Having found one cookie that matches, there should be no more
|
|
#ifdef DEBUG
|
|
while (p_n = p_prev->Next())
|
|
{
|
|
ASSERT(p_n->m_dwAdviseCookie != dwAdviseCookie);
|
|
p_prev = p_n;
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
p_prev = p_n;
|
|
};
|
|
m_Serialize.Unlock();
|
|
return hr;
|
|
}
|
|
|
|
REFERENCE_TIME CAMSchedule::Advise( const REFERENCE_TIME & rtTime )
|
|
{
|
|
REFERENCE_TIME rtNextTime;
|
|
CAdvisePacket * pAdvise;
|
|
|
|
DbgLog((LOG_TIMING, 2,
|
|
TEXT("CAMSchedule::Advise( %lu ms )"), ULONG(rtTime / (UNITS / MILLISECONDS))));
|
|
|
|
CAutoLock lck(&m_Serialize);
|
|
|
|
#ifdef DEBUG
|
|
if (DbgCheckModuleLevel(LOG_TIMING, 4)) DumpLinkedList();
|
|
#endif
|
|
|
|
// Note - DON'T cache the difference, it might overflow
|
|
while ( rtTime >= (rtNextTime = (pAdvise=head.m_next)->m_rtEventTime) &&
|
|
!pAdvise->IsZ() )
|
|
{
|
|
ASSERT(pAdvise->m_dwAdviseCookie); // If this is zero, its the head or the tail!!
|
|
|
|
ASSERT(pAdvise->m_hNotify != INVALID_HANDLE_VALUE);
|
|
|
|
if (pAdvise->m_bPeriodic == TRUE)
|
|
{
|
|
ReleaseSemaphore(pAdvise->m_hNotify,1,NULL);
|
|
pAdvise->m_rtEventTime += pAdvise->m_rtPeriod;
|
|
ShuntHead();
|
|
}
|
|
else
|
|
{
|
|
ASSERT( pAdvise->m_bPeriodic == FALSE );
|
|
EXECUTE_ASSERT(SetEvent(pAdvise->m_hNotify));
|
|
--m_dwAdviseCount;
|
|
Delete( head.RemoveNext() );
|
|
}
|
|
|
|
}
|
|
|
|
DbgLog((LOG_TIMING, 3,
|
|
TEXT("CAMSchedule::Advise() Next time stamp: %lu ms, for advise %lu."),
|
|
DWORD(rtNextTime / (UNITS / MILLISECONDS)), pAdvise->m_dwAdviseCookie ));
|
|
|
|
return rtNextTime;
|
|
}
|
|
|
|
/* Private methods */
|
|
|
|
DWORD_PTR CAMSchedule::AddAdvisePacket( __inout CAdvisePacket * pPacket )
|
|
{
|
|
ASSERT(pPacket->m_rtEventTime >= 0 && pPacket->m_rtEventTime < MAX_TIME);
|
|
ASSERT(CritCheckIn(&m_Serialize));
|
|
|
|
CAdvisePacket * p_prev = &head;
|
|
CAdvisePacket * p_n;
|
|
|
|
const DWORD_PTR Result = pPacket->m_dwAdviseCookie = ++m_dwNextCookie;
|
|
// This relies on the fact that z is a sentry with a maximal m_rtEventTime
|
|
for(;;p_prev = p_n)
|
|
{
|
|
p_n = p_prev->m_next;
|
|
if ( p_n->m_rtEventTime >= pPacket->m_rtEventTime ) break;
|
|
}
|
|
p_prev->InsertAfter( pPacket );
|
|
++m_dwAdviseCount;
|
|
|
|
DbgLog((LOG_TIMING, 2, TEXT("Added advise %lu, for thread 0x%02X, scheduled at %lu"),
|
|
pPacket->m_dwAdviseCookie, GetCurrentThreadId(), (pPacket->m_rtEventTime / (UNITS / MILLISECONDS)) ));
|
|
|
|
// If packet added at the head, then clock needs to re-evaluate wait time.
|
|
if ( p_prev == &head ) SetEvent( m_ev );
|
|
|
|
return Result;
|
|
}
|
|
|
|
void CAMSchedule::Delete( __inout CAdvisePacket * pPacket )
|
|
{
|
|
if ( m_dwCacheCount >= dwCacheMax ) delete pPacket;
|
|
else
|
|
{
|
|
m_Serialize.Lock();
|
|
pPacket->m_next = m_pAdviseCache;
|
|
m_pAdviseCache = pPacket;
|
|
++m_dwCacheCount;
|
|
m_Serialize.Unlock();
|
|
}
|
|
}
|
|
|
|
|
|
// Takes the head of the list & repositions it
|
|
void CAMSchedule::ShuntHead()
|
|
{
|
|
CAdvisePacket * p_prev = &head;
|
|
CAdvisePacket * p_n;
|
|
|
|
m_Serialize.Lock();
|
|
CAdvisePacket *const pPacket = head.m_next;
|
|
|
|
// This will catch both an empty list,
|
|
// and if somehow a MAX_TIME time gets into the list
|
|
// (which would also break this method).
|
|
ASSERT( pPacket->m_rtEventTime < MAX_TIME );
|
|
|
|
// This relies on the fact that z is a sentry with a maximal m_rtEventTime
|
|
for(;;p_prev = p_n)
|
|
{
|
|
p_n = p_prev->m_next;
|
|
if ( p_n->m_rtEventTime > pPacket->m_rtEventTime ) break;
|
|
}
|
|
// If p_prev == pPacket then we're already in the right place
|
|
if (p_prev != pPacket)
|
|
{
|
|
head.m_next = pPacket->m_next;
|
|
(p_prev->m_next = pPacket)->m_next = p_n;
|
|
}
|
|
#ifdef DEBUG
|
|
DbgLog((LOG_TIMING, 2, TEXT("Periodic advise %lu, shunted to %lu"),
|
|
pPacket->m_dwAdviseCookie, (pPacket->m_rtEventTime / (UNITS / MILLISECONDS)) ));
|
|
#endif
|
|
m_Serialize.Unlock();
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
void CAMSchedule::DumpLinkedList()
|
|
{
|
|
m_Serialize.Lock();
|
|
int i=0;
|
|
DbgLog((LOG_TIMING, 1, TEXT("CAMSchedule::DumpLinkedList() this = 0x%p"), this));
|
|
for ( CAdvisePacket * p = &head
|
|
; p
|
|
; p = p->m_next , i++
|
|
)
|
|
{
|
|
DbgLog((LOG_TIMING, 1, TEXT("Advise List # %lu, Cookie %d, RefTime %lu"),
|
|
i,
|
|
p->m_dwAdviseCookie,
|
|
p->m_rtEventTime / (UNITS / MILLISECONDS)
|
|
));
|
|
}
|
|
m_Serialize.Unlock();
|
|
}
|
|
#endif
|