term% cat index.txt LOCK(1) General Commands Manual LOCK(1)
NAME
lock - run a command under lock
SYNOPSIS
lock [ -w ] lockfile [ command [ argument ... ] ]
DESCRIPTION
Lock runs command (default with arguments while holding lockfile open
and (over)writing at least one byte each minute to keep the exclusive-
access lock alive. If lockfile doesn't already have the exclusive-ac‐
cess bit set in its mode, the exclusive-access bits are set in its mode
and qid.type.
Under -w, lock waits for exclusive access to lockfile instead of just
trying once.
Lock sets /env/prompt to contain the name of the lock file.
EXAMPLES
Build a replica(1) database while preventing collisions with other oc‐
currences.
cd /sys/lib/dist
lock scan.lock replica/scan $dist/sources.replica
SOURCE
/sys/src/cmd/lock.c
SEE ALSO
intro(5), stat(5)
LOCK(1)