ada/csce410pine64backup
Archived
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

release_frames() finished. moving on to debugging.

Browse source
This commit is contained in:
Alex 2017-06-19 11:23:36 -05:00
parent e655168599
commit 2d02f6f0fa
1 changed files with 42 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

53
MP2/MP2_Sources/cont_frame_pool.C
View file

@ -187,7 +187,7 @@ ContFramePool::ContFramePool(unsigned long _base_frame_no,
while(c < n_info_frames)
{
bitmap[i] = bitmap[i] ^ mask;
if(mask == 0x00)
if(mask == 0x02)
{
i++;
mask = 0xC0;
@ -230,7 +230,7 @@ unsigned long ContFramePool::get_frames(unsigned int _n_frames)
// check every 2 bits for a free frame in the bitmap
while((mask & bitmap[i]) == 0 || ((mask >> 1) & bitmap[i]) == 0)
{
if(mask != 0x00)
if(mask != 0x02)
{
j++;
mask >> 2;
@ -250,7 +250,7 @@ unsigned long ContFramePool::get_frames(unsigned int _n_frames)
c++;
while(c < _n_frames)
{
if(mask != 0x00)
if(mask != 0x02)
{
mask >> 2;
}
@ -289,7 +289,7 @@ unsigned long ContFramePool::get_frames(unsigned int _n_frames)
unsigned int temp = i;
while(c < _n_frames)
{
if(mask != 0x00)
if(mask != 0x02)
{
mask >> 2;
}
@ -335,12 +335,28 @@ void ContFramePool::mark_inaccessible(unsigned long _frame_no)
nFreeFrames--;
}
void ContFramePool::release_frames(unsigned long _first_frame_no)
void ContFramePool::release_frames(unsigned long _frame_no)
{
unsigned int i = 0;
while(i < pools.size())
{
if(_frame_no < pools[i].base_frame_no || _frame_no > (pools[i].base_frame_no + pools[i].nframes))
{
i++;
}
else
{
pools[i].release_frames_here(_frame_no);
return;
}
}
// This is the case where we fail to find the frame in any of the pools.
assert(false);
}
// Find a way to find which pool has this frame.
void ContFramePool::release_frames_here(unsigned long _first_frame_no)
{
unsigned char * bitmap = this->bitmap;
unsigned int bitmap_index = (_first_frame_no - base_frame_no) / 4;
unsigned char mask = 0x80 >> ((_first_frame_no - base_frame_no) % 4) * 2;
@ -352,12 +368,27 @@ void ContFramePool::release_frames(unsigned long _first_frame_no)
}
bitmap[bitmap_index] ^= mask;
nFreeFrames++;
if(mask != 0x02)
{
mask >> 2;
}
else
{
mask = 0x80;
bitmap_index++;
}
while(bitmap[bitmap_index] & mask == 0 && (bitmap[bitmap_index] & (mask >> 1)) == 0)
{
bitmap[bitmap_index] ^= mask;
bitmap[bitmap_index] ^= (mask >> 1);
nFreeFrames++;
}
}
unsigned long ContFramePool::needed_info_frames(unsigned long _n_frames)
{
// TODO: IMPLEMENTATION NEEEDED!
assert(false);
return _n_frames / (FRAME_SIZE * 4);
}