module Lock_file: Lock_file
val create : ?message:string ->
?close_on_exec:bool -> ?unlink_on_exit:bool -> string -> bool
create ?close_on_exec ?message path
tries to create a file at path
containing the
text message
, which defaults to the pid of the locking process. It returns true on
success, false on failure. Note: there is no way to release the lock or the fd
created inside! It will only be released when the process dies. If close_on_exec is
false, then the lock will not be released until children created via fork and exec
also terminate. If not specified, close_on_exec=true. Note that by default, the lock
file is not cleaned up for you when the process exits. If you pass
unlink_on_exit:true
, an at_exit handler will be set up to remove the lock-file on
program termination.
val create_exn : ?message:string ->
?close_on_exec:bool -> ?unlink_on_exit:bool -> string -> unit
create_exn ?message path
is like create
except that it throws an exception on
failure instead of returning a boolean value
val blocking_create : ?message:string ->
?close_on_exec:bool -> ?unlink_on_exit:bool -> string -> unit
blocking_create t
tries to create the lock. If another process holds the lock this
function will wait until it is released.
val is_locked : string -> bool
is_locked path
returns true when the file at path
exists and is locked, false
otherwise.
module Nfs: sig
.. end
An implementation neutral NFS lock file scheme that relies on the atomicity of link
over NFS (see NFS Illustrated, atomicity for more information).