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Mention that locks are inherited across an exec.

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PR:		24802
Submitted by:	Kenneth Ingham <ingham@i-pi.com>
This commit is contained in:
Dima Dorfman 2001-04-08 19:11:25 +00:00
parent 7401f04659
commit 92020f7a8c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=75313
1 changed files with 6 additions and 0 deletions
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6
lib/libc/sys/fcntl.2
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@ -333,6 +333,12 @@ locks may be safely used concurrently.
All locks associated with a file for a given process are
removed when the process terminates.
.Pp
All locks obtained before a call to
.Xr execve 2
remain in effect until the new program releases them.
If the new program does not know about the locks, they will not be
released until the program exits.
.Pp
A potential for deadlock occurs if a process controlling a locked region
is put to sleep by attempting to lock the locked region of another process.
This implementation detects that sleeping until a locked region is unlocked