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add Lock.got_exclusive_lock

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This commit is contained in:
Thomas Waldmann 2016-07-23 13:58:19 +02:00
parent 976925c625
commit 26007c0162
2 changed files with 13 additions and 0 deletions
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5
borg/locking.py
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@ -299,6 +299,8 @@ def release(self):
self._roster.modify(SHARED, REMOVE)
def upgrade(self):
# WARNING: if multiple read-lockers want to upgrade, it will deadlock because they
# all will wait until the other read locks go away - and that won't happen.
if not self.is_exclusive:
self.acquire(exclusive=True, remove=SHARED)
@ -306,6 +308,9 @@ def downgrade(self):
if self.is_exclusive:
self.acquire(exclusive=False, remove=EXCLUSIVE)
def got_exclusive_lock(self):
return self.is_exclusive and self._lock.is_locked() and self._lock.by_me()
def break_lock(self):
self._roster.remove()
self._lock.break_lock()

8
borg/testsuite/locking.py
View file

@ -86,6 +86,14 @@ def test_downgrade(self, lockpath):
assert len(lock._roster.get(SHARED)) == 1
assert len(lock._roster.get(EXCLUSIVE)) == 0
def test_got_exclusive_lock(self, lockpath):
lock = UpgradableLock(lockpath, exclusive=True, id=ID1)
assert not lock.got_exclusive_lock()
lock.acquire()
assert lock.got_exclusive_lock()
lock.release()
assert not lock.got_exclusive_lock()
def test_break(self, lockpath):
lock = UpgradableLock(lockpath, exclusive=True, id=ID1).acquire()
lock.break_lock()