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| author | julian <julian@FreeBSD.org> | 2002-07-08 07:34:46 +0000 |
|---|---|---|
| committer | julian <julian@FreeBSD.org> | 2002-07-08 07:34:46 +0000 |
| commit | dbc09ded51da8f5e44abc55ff65113f3a408c70a (patch) | |
| tree | 1db3c34100ec3a0ad50d9d626182fe918da0b683 /share/man/man9/ucred.9 | |
| parent | 7cab19d5769aa273ab939702cb0d98701d5daa0b (diff) | |
| download | FreeBSD-src-dbc09ded51da8f5e44abc55ff65113f3a408c70a.zip FreeBSD-src-dbc09ded51da8f5e44abc55ff65113f3a408c70a.tar.gz | |
Slight changes to reflect some of the changes in -current.
mi_switch(9) is still wildly innacurate. I suggest that every kernel
developer takes 20 minutes a day for the next few days and updates one or
two of his favourite chapter 9 man pages as they are now WAY out of date
in general. I will add a couple of KSE related pages soon.
Diffstat (limited to 'share/man/man9/ucred.9')
| -rw-r--r-- | share/man/man9/ucred.9 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/share/man/man9/ucred.9 b/share/man/man9/ucred.9 index aa80cc9..a952631 100644 --- a/share/man/man9/ucred.9 +++ b/share/man/man9/ucred.9 @@ -143,6 +143,16 @@ structure. .Fn crshared returns 0 if the credential has a reference count greater than 1; otherwise, 1 is returned. +.Sh USAGE NOTES +In general in a system call, +you should always use the +.Vt ucred +associated with the +thread doing the work rather than that of the process attached to it, +As that associated with the thread is guaranteed to be safely accessed +under SMP, and will remain stable for the duration of the call, even +in the face of a multithreaded application changing the process credentials +from another thread. .Sh SEE ALSO .Xr uihold 9 .Sh AUTHORS |
