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    Subject[PATCH 2/5] pid: Add macros for interating through tasks by type.
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    Date

    Currently do_each_task_pid/while_each_task_pid make it
    possible to iterate through each task of a group of
    processes given the pid of the group.

    do_each_task/while_each_task do the same thing but assume
    you are atarting with the first task of a process group.
    This is needed so we can start with a task_ref instead
    of a pid.

    Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>


    ---

    include/linux/pid.h | 12 ++++++++++++
    1 files changed, 12 insertions(+), 0 deletions(-)

    34e71e62a13a78350239c18e3e3c31e79593380f
    diff --git a/include/linux/pid.h b/include/linux/pid.h
    index e206149..7fa9b2e 100644
    --- a/include/linux/pid.h
    +++ b/include/linux/pid.h
    @@ -54,4 +54,16 @@ extern void switch_exec_pids(struct task
    hlist_unhashed(&(task)->pids[type].pid_chain)); \
    } \

    +#define do_each_task(task, type) \
    + if (task) { \
    + prefetch((task)->pids[type].pid_list.next); \
    + do {
    +
    +#define while_each_task(task, type) \
    + } while (task = pid_task((task)->pids[type].pid_list.next, \
    + (type)), \
    + prefetch((task)->pids[type].pid_list.next), \
    + hlist_unhashed(&(task)->pids[type].pid_chain)); \
    + }
    +
    #endif /* _LINUX_PID_H */
    --
    1.1.5.g3480
    -
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