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qmemman: use try/finally to really release the lock

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Currently not needed in practice, but a preparation for the next
commit(s).

QubesOS/qubes-issues#1389
This commit is contained in:
Marek Marczykowski-Górecki 2016-01-14 03:32:18 +01:00
parent 6a99b0b2ba
commit 3eccc3a633
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GPG Key ID: 063938BA42CFA724
1 changed files with 15 additions and 15 deletions
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30
qmemman/qmemman_server.py
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@ -93,22 +93,22 @@ class XS_Watcher:
self.log.debug('acquiring global_lock')
global_lock.acquire()
self.log.debug('global_lock acquired')
try:
for i in only_in_first_list(curr, self.watch_token_dict.keys()):
#new domain has been created
watch = WatchType(XS_Watcher.meminfo_changed, i)
self.watch_token_dict[i] = watch
self.handle.watch(get_domain_meminfo_key(i), watch)
system_state.add_domain(i)
for i in only_in_first_list(curr, self.watch_token_dict.keys()):
#new domain has been created
watch = WatchType(XS_Watcher.meminfo_changed, i)
self.watch_token_dict[i] = watch
self.handle.watch(get_domain_meminfo_key(i), watch)
system_state.add_domain(i)
for i in only_in_first_list(self.watch_token_dict.keys(), curr):
#domain destroyed
self.handle.unwatch(get_domain_meminfo_key(i), self.watch_token_dict[i])
self.watch_token_dict.pop(i)
system_state.del_domain(i)
global_lock.release()
self.log.debug('global_lock released')
for i in only_in_first_list(self.watch_token_dict.keys(), curr):
#domain destroyed
self.handle.unwatch(get_domain_meminfo_key(i), self.watch_token_dict[i])
self.watch_token_dict.pop(i)
system_state.del_domain(i)
finally:
global_lock.release()
self.log.debug('global_lock released')
system_state.do_balance()