def do_acquire(self, waitflag=False):
locked = False
if waitflag:
blockflag = 0
else:
blockflag = fcntl.LOCK_NB
self.fd = posix.open(self.fn, O_CREAT | O_RDWR, 0600)
try:
fcntl.flock(self.fd, fcntl.LOCK_EX | blockflag)
# locked it
try:
posix.ftruncate(self.fd, 0)
posix.write(self.fd, ` os.getpid() ` + '\n')
locked = True
except:
self.do_release()
raise
except IOError, x:
if x.errno == errno.EWOULDBLOCK:
# failed to lock
posix.close(self.fd)
del self.fd
else:
raise
def do_release(self):
if self.fd is not None:
posix.ftruncate(self.fd, 0)
fcntl.flock(self.fd, fcntl.LOCK_UN)
posix.close(self.fd)
self.fd = None
self._locked = False
def do_release(self):
if self.fd is not None:
posix.ftruncate(self.fd, 0)
fcntl.flock(self.fd, fcntl.LOCK_UN)
posix.close(self.fd)
self.fd = None
self._locked = False
def do_acquire(self, waitflag=False):
locked = False
if waitflag:
blockflag = 0
else:
blockflag = fcntl.LOCK_NB
self.fd = posix.open(self.fn, O_CREAT | O_RDWR, 0600)
try:
fcntl.flock(self.fd, fcntl.LOCK_EX|blockflag)
# locked it
try:
posix.ftruncate(self.fd, 0)
posix.write(self.fd, `os.getpid()` + '\n')
locked = True
except:
self.do_release()
raise
except IOError, x:
if x.errno == errno.EWOULDBLOCK:
# failed to lock
posix.close(self.fd)
del self.fd
else:
raise
def test_ftruncate(self):
if hasattr(posix, 'ftruncate'):
fp = open(test_support.TESTFN, 'w+')
try:
# we need to have some data to truncate
fp.write('test')
fp.flush()
posix.ftruncate(fp.fileno(), 0)
finally:
fp.close()
def test_ftruncate(self):
if hasattr(posix, "ftruncate"):
fp = open(test_support.TESTFN, "w+")
try:
# we need to have some data to truncate
fp.write("test")
fp.flush()
posix.ftruncate(fp.fileno(), 0)
finally:
fp.close()
def SetSpeedup(speedup):
global f
speedup = float(speedup)
# Opening the file for reading and writing prevents blocking until a reader opens the file.
if f is None:
f = posix.open(FIFO, posix.O_RDWR | posix.O_CREAT)
posix.ftruncate(f, 0)
SEEK_SET = 0
posix.lseek(f, 0, SEEK_SET)
posix.write(f, struct.pack("f", speedup))
def do_release(self):
posix.ftruncate(self.fd, 0)
fcntl.flock(self.fd, fcntl.LOCK_UN)
posix.close(self.fd)
del self.fd
