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mark_inaccessible should be finished. Initial skeleton for release_frames.

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Alex 2017-06-19 10:44:57 -05:00
parent 1c011508c1
commit e655168599
1 changed files with 41 additions and 5 deletions
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44
MP2/MP2_Sources/cont_frame_pool.C
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@ -259,7 +259,7 @@ unsigned long ContFramePool::get_frames(unsigned int _n_frames)
temp++; temp++;
mask = 0x80; mask = 0x80;
} }
if((mask & bitmap[temp]) != 0 ^^ ((mask >> 1) & bitmap[temp]) != 0) if((mask & bitmap[temp]) != 0 && ((mask >> 1) & bitmap[temp]) != 0)
{ {
c++; c++;
} }
@ -310,16 +310,52 @@ unsigned long ContFramePool::get_frames(unsigned int _n_frames)
void ContFramePool::mark_inaccessible(unsigned long _base_frame_no, void ContFramePool::mark_inaccessible(unsigned long _base_frame_no,
unsigned long _n_frames) unsigned long _n_frames)
{ {
// TODO: IMPLEMENTATION NEEEDED! // Mark all frames in the range as being used.
assert(false); int i ;
for(i = _base_frame_no; i < _base_frame_no + _n_frames; i++){
mark_inaccessible(i);
} }
nFreeFrames -= _n_frames;
}
void ContFramePool::mark_inaccessible(unsigned long _frame_no)
{
// Let's first do a range check.
assert ((_frame_no >= base_frame_no) && (_frame_no < base_frame_no + nframes));
unsigned int bitmap_index = (_frame_no - base_frame_no) / 4;
unsigned char mask = 0x80 >> ((_frame_no - base_frame_no) % 4) * 2;
// Is the frame being used already?
assert(((bitmap[bitmap_index] & mask) != 0) && (bitmap[bitmap_index] & (mask >> 1)) != 0);
// Update bitmap
bitmap[bitmap_index] ^= mask;
bitmap[bitmap_index] ^= mask >> 1;
nFreeFrames--;
}
void ContFramePool::release_frames(unsigned long _first_frame_no) void ContFramePool::release_frames(unsigned long _first_frame_no)
{ {
// TODO: IMPLEMENTATION NEEEDED!
// Find a way to find which pool has this frame.
unsigned int bitmap_index = (_first_frame_no - base_frame_no) / 4;
unsigned char mask = 0x80 >> ((_first_frame_no - base_frame_no) % 4) * 2;
if((bitmap[bitmap_index] & mask) != 0 && (bitmap[bitmap_index] & (mask >> 1)) != 0)
{
Console::puts("Error, Frame being released is not being used\n");
assert(false); assert(false);
} }
bitmap[bitmap_index] ^= mask;
nFreeFrames++;
}
unsigned long ContFramePool::needed_info_frames(unsigned long _n_frames) unsigned long ContFramePool::needed_info_frames(unsigned long _n_frames)
{ {
// TODO: IMPLEMENTATION NEEEDED! // TODO: IMPLEMENTATION NEEEDED!