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Rev	Author	Line No.	Line
2	-	1	`.TH LOCK 1`
		2	`.SH NAME`
		3	`lock \- run a command under lock`
		4	`.SH SYNOPSIS`
		5	`.B lock`
		6	`[`
		7	`.B -w`
		8	`]`
		9	`.I lockfile`
		10	`[`
		11	`.I command`
		12	`[`
		13	`.I argument`
		14	`\&...`
		15	`] ]`
		16	`.SH DESCRIPTION`
		17	`.I Lock`
		18	`runs`
		19	`.I command`
		20	`(default`
		21	`.LR rc )`
		22	`with`
		23	`.I arguments`
		24	`while holding`
		25	`.I lockfile`
		26	`open and (over)writing at least one byte each minute`
		27	`to keep the exclusive-access lock alive.`
		28	`If`
		29	`.I lockfile`
		30	`doesn't already have the exclusive-access bit set in`
		31	`its mode,`
		32	`the exclusive-access bits are set in its mode and`
		33	`.BR qid.type .`
		34	`.PP`
		35	`Under`
		36	`.BR -w ,`
		37	`.I lock`
		38	`waits for exclusive access to`
		39	`.I lockfile`
		40	`instead of just trying once.`
		41	`.PP`
		42	`.I Lock`
		43	`sets`
		44	`.B /env/prompt`
		45	`to contain the name of the lock file.`
		46	`.SH EXAMPLES`
		47	`Build a`
		48	`.IR replica (1)`
		49	`database while preventing collisions with other occurrences.`
		50	`.IP`
		51	`.EX`
		52	`cd /sys/lib/dist`
		53	`lock scan.lock replica/scan $dist/sources.replica`
		54	`.EE`
		55	`.SH SOURCE`
		56	`.B /sys/src/cmd/lock.c`
		57	`.SH SEE ALSO`
		58	`.IR intro (5),`
		59	`.IR stat (5)`
		60	`.\" .SH DIAGNOSTICS`
		61	`.\" .SH BUGS`

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