Fast hierarchical locks
Project description
Hierarchical locks
Allows the caller to lock a "directory", or an individual file.
Locks are, by default, shared, recursive & timed.
First optional argument to the lock manager is the "sep".
Second optional argument is "flags" (default is HiLokFlags.RECURSIVE, can be also be HiLokFlags:STRICT).
from hilok import HiLok, HiLokError, HiLokFlags
h = HiLok() # default sep is '/', can pass it in here
rd = h.read("/some/path")
# nonblocking, this will fail!
try:
wr = h.write("/some", block=False)
except HiLokError:
pass
rd.release()
wr = h.write("/some")
# timeout=0 is the the same as block=False
rd = h.read("/some/path", block=False)
# with syntax is fine:
with h.read("/some/path"):
pass
Lock modes:
HiLokFlags.STRICT
: not reentrant, the good modeHiLokFlags.RECURSIVE
: fully reentrant, supports escalation (read/write/release-read) and de-escalation (write/read/release-write)HiLokFlags.RECURSIVE_WRITE
: only write-locks are reentrantHiLokFlags.RECURSIVE_ONEWAY
: can read-lock while holding a write, but not vice-versa
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