def set_bitmap_signed():
result = bitmap.new(0, -32)
freeslot = 0
count = 3
result = bitmap.set(result, freeslot, 1, count)
if bitmap.value(result) == 7:
raise Success
def set_bitmap_signed():
result = bitmap.new(0, -32)
freeslot = 0
count = 3
result = bitmap.set(result, freeslot, 1, count)
if bitmap.value(result) == 7:
raise Success
def __alloc_from_bucket(self, bucket, size):
for i,n in zip(range(len(bucket)), bucket):
pointer,(chunksize,layout) = n
count = (size / chunksize)+1
try:
freeslot = bitmap.runscan(layout, 0, count)
except ValueError:
raise NotImplementedError('none free in index %d -> %s'% (i, bitmap.string(layout))) # just because i haven't done this test case yet
continue
layout = bitmap.set(layout, freeslot, 1, count)
# found a free slot, write it directly into bucket
bucket[i] = (pointer, (chunksize, layout))
return pointer + freeslot*chunksize, bucket[i]
raise ValueError('Unable to allocate %d bytes out of bucket %s'% (size, repr(bucket)))
def __alloc_from_bucket(self, bucket, size):
for i, n in zip(range(len(bucket)), bucket):
pointer, (chunksize, layout) = n
count = (size // chunksize) + 1
try:
freeslot = bitmap.runscan(layout, 0, count)
except ValueError:
raise NotImplementedError(
'none free in index %d -> %s' % (i, bitmap.string(layout))
) # just because i haven't done this test case yet
continue
layout = bitmap.set(layout, freeslot, 1, count)
# found a free slot, write it directly into bucket
bucket[i] = (pointer, (chunksize, layout))
return pointer + freeslot * chunksize, bucket[i]
raise ValueError(
'Unable to allocate {:d} bytes out of bucket {!r}'.format(
size, bucket))
def __free_arena(self, pointer):
pagemask = self.allocator.getPageSize()-1
page = pointer & ~pagemask
arena = self.allocations[page]
basepointer,(chunksize,layout) = arena
# convert pointer into index
offset = pointer - basepointer
index = offset / chunksize
# clear the bit
layout = bitmap.set(layout, index, False)
self.allocations[page] = (basepointer,(chunksize,layout))
# if all the bits are clear, we can remove this page
if bitmap.empty(layout):
self.allocator.freeWriteable(page, 1)
del(self.allocations[page])
return
# perhaps zero the buffer out?
return
def __free_arena(self, pointer):
pagemask = self.allocator.getPageSize() - 1
page = pointer & ~pagemask
arena = self.allocations[page]
basepointer, (chunksize, layout) = arena
# convert pointer into index
offset = pointer - basepointer
index = offset // chunksize
# clear the bit
layout = bitmap.set(layout, index, False)
self.allocations[page] = (basepointer, (chunksize, layout))
# if all the bits are clear, we can remove this page
if bitmap.isempty(layout):
self.allocator.freeWriteable(page, 1)
del (self.allocations[page])
return
# perhaps zero the buffer out?
return
