Commit 558cb325 authored Oct 02, 2006 by Eric W. Biederman Committed by Linus Torvalds Oct 02, 2006

[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>

parent 22c935f4

include/linux/pid.h

+13 −0

Original line number	Diff line number	Diff line
		@@ -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 */