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[PATCH] pid: add do_each_pid_task

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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>
This commit is contained in:
Eric W. Biederman 2006-10-02 02:17:09 -07:00 committed by Linus Torvalds
parent 22c935f47c
commit 558cb32548
1 changed files with 13 additions and 0 deletions
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13
include/linux/pid.h
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@ -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 */