bool FrSymbol::isLocked() const
{
FrFrame *fr = find_vframe_inline(this) ;
if (fr)
return fr->isLocked() ;
else if (VFrame_Info)
return VFrame_Info->isLocked(this) ;
else
return false ;
}
static bool discard_clean_frame(const FrObject *obj, va_list args)
{
FrVarArg(uint32_t,thres) ;
FrVarArg(int *,discarded) ;
FrFrame *frame = ((FrSymbol*)obj)->symbolFrame() ;
// throw out the current frame if it is a clean virtual frame last used
// before the threshold value of the clock
if (frame && frame->isVFrame() && !frame->isLocked() &&
!frame->dirtyFrame() && frame->getLRUclock() < thres)
{
frame->discard() ; // discard the frame
(*discarded)++ ;
}
return true ;
}
bool FrSymbol::unlockFrame()
{
FrFrame *fr = symbolFrame() ;
// don't use find_vframe above, to avoid pulling in frame if not already
// in memory
if (fr && fr->isLocked() && VFrame_Info)
{
if (VFrame_Info->unlockFrame(this))
fr->setLock(false) ;
else
return false ;
}
return true ;
}
FrFrame *FrSymbol::lockFrame()
{
FrFrame *fr = find_vframe_inline(this) ;
if (fr && !fr->isLocked() && VFrame_Info)
{
if (VFrame_Info->lockFrame(this))
fr->setLock(true) ;
else
{
FrWarningVA("unable to lock frame %s",symbolName()) ;
return 0 ;
}
}
return fr ;
}
static bool discard_dirty_frame(const FrObject *obj, va_list args)
{
FrVarArg(uint32_t,thres) ;
FrVarArg(int *,discarded) ;
FrFrame *frame = ((FrSymbol*)obj)->symbolFrame() ;
// throw out any and all unlocked virtual frames, even if dirty, that were
// last used before the threshold value of the clock
if (frame && frame->isVFrame() && !frame->isLocked() &&
frame->getLRUclock() < thres)
{
if (frame->dirtyFrame())
frame->frameName()->commitFrame() ;
frame->discard() ; // discard the frame
(*discarded)++ ;
}
return true ;
}