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Perform file locking on win32

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The functions _insert_bytes_no_mmap and _delete_bytes_no_mmap call
mutagen.util.lock, which in turn uses the fnctl module which isn't
available on Windows.
This commit is contained in:
Michael Wiencek
2013-06-01 16:46:06 -05:00
parent 76d3493066
commit 21c61b4bec
1 changed files with 17 additions and 4 deletions
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21
picard/formats/__init__.py
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@@ -68,7 +68,7 @@ def _insert_bytes_no_mmap(fobj, size, offset, BUFFER_SIZE=2**16):
fobj.write('\x00' * size)
fobj.flush()
try:
locked = _util.lock(fobj)
locked = _win32_locking(fobj, filesize, msvcrt.LK_LOCK)
fobj.truncate(filesize)
fobj.seek(0, 2)
@@ -101,7 +101,8 @@ def _insert_bytes_no_mmap(fobj, size, offset, BUFFER_SIZE=2**16):
fobj.flush()
finally:
if locked:
_util.unlock(fobj)
_win32_locking(fobj, filesize, msvcrt.LK_UNLCK)
def _delete_bytes_no_mmap(fobj, size, offset, BUFFER_SIZE=2**16):
@@ -121,7 +122,7 @@ def _delete_bytes_no_mmap(fobj, size, offset, BUFFER_SIZE=2**16):
try:
if movesize > 0:
fobj.flush()
locked = _util.lock(fobj)
locked = _win32_locking(fobj, filesize, msvcrt.LK_LOCK)
fobj.seek(offset + size)
buf = fobj.read(BUFFER_SIZE)
while buf:
@@ -134,9 +135,21 @@ def _delete_bytes_no_mmap(fobj, size, offset, BUFFER_SIZE=2**16):
fobj.flush()
finally:
if locked:
_util.unlock(fobj)
_win32_locking(fobj, filesize, msvcrt.LK_UNLCK)
def _win32_locking(fobj, nbytes, mode):
try:
fobj.seek(0)
msvcrt.locking(fobj.fileno(), mode, nbytes)
except IOError:
return False
else:
return True
if sys.platform == 'win32':
import msvcrt
_util.insert_bytes = _insert_bytes_no_mmap
_util.delete_bytes = _delete_bytes_no_mmap