def test_lock_error(self):
lock = ReadWriteLock()
py.test.raises(LockingError, lock.release_read)
py.test.raises(LockingError, lock.release_write)
py.test.raises(LockingError, lock.upgrade)
py.test.raises(LockingError, lock.downgrade)
lock.acquire_read()
py.test.raises(LockingError, lock.release_write)
lock.upgrade()
py.test.raises(LockingError, lock.release_read)
lock.release_write()
from draco2.core.event import EventManager
from draco2.core.handler import Handler
from draco2.draco.handler import DracoHandler
from draco2.database.manager import DatabaseManager
from draco2.model.manager import ModelManager
from draco2.security.context import SecurityContext
from draco2.email.sendmail import Sendmail
from draco2.util import http
from draco2.util import uri as urimod
from draco2.util.rwlock import ReadWriteLock
from draco2.util.singleton import singleton
from draco2.util.misc import get_backtrace
initialized = False
rwlock = ReadWriteLock()
initlock = threading.Lock()
def handle_request(iface):
"""Handle a request."""
# Acquire the read-write lock. This lock is held by all threads in
# read mode when serving a Draco request. If one of the global Draco
# objects needs to be reloaded, the lock is upgraded to write mode
# by the thread that detected the reload condition. All threads will
# then serialize and the reload can continue.
rwlock.acquire_read()
try:
# Once off initialization. No user code can be run from this, and
# there's no option of recording errors.
initlock.acquire()
