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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2006-10-02 02:17:09 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-02 07:57:13 -0700 |
| commit | 558cb325485aaf655130f140e8ddd25392f6c972 (patch) | |
| tree | adfea6c0b901cf6591209d29091ff5ac298843c3 /include/linux/pid.h | |
| parent | [PATCH] pid: implement access helpers for a tacks various process groups (diff) | |
| download | linux-dev-558cb325485aaf655130f140e8ddd25392f6c972.tar.xz linux-dev-558cb325485aaf655130f140e8ddd25392f6c972.zip | |
[PATCH] pid: add do_each_pid_task
To avoid pid rollover confusion the kernel needs to work with struct pid *
instead of pid_t. Currently there is not an iterator that walks through all
of the tasks of a given pid type starting with a struct pid. This prevents us
replacing some pid_t instances with struct pid. So this patch adds
do_each_pid_task which walks through the set of task for a given pid type
starting with a struct pid.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/pid.h')
| -rw-r--r-- | include/linux/pid.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h index 359121086de1..8cf9b11ed264 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -119,4 +119,17 @@ extern void FASTCALL(free_pid(struct pid *pid)); 1; }) ); \ } +#define do_each_pid_task(pid, type, task) \ + if ((task = pid_task(pid, type))) { \ + prefetch(pid_next(task, type)); \ + do { + +#define while_each_pid_task(pid, type, task) \ + } while (pid_next(task, type) && ({ \ + task = pid_next_task(task, type); \ + rcu_dereference(task); \ + prefetch(pid_next(task, type)); \ + 1; }) ); \ + } + #endif /* _LINUX_PID_H */ |