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    Subject[ 16/23] [Suspend2] Helper to signal all threads of a type.
    Date

    Add a helper to do the actual signalling of processes, telling them to
    enter the refrigerator.

    Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

    kernel/power/process.c | 25 +++++++++++++++++++++++++
    1 files changed, 25 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/process.c b/kernel/power/process.c
    index 9cfafa7..2857c8b 100644
    --- a/kernel/power/process.c
    +++ b/kernel/power/process.c
    @@ -250,6 +250,31 @@ static int num_uninterruptible(int do_al
    return count;
    }

    +/*
    + * Tell threads of the type to enter the freezer.
    + */
    +static void signal_threads(int do_all_threads)
    +{
    + struct task_struct *g, *p;
    + struct notifier_block *n;
    +
    + read_lock(&tasklist_lock);
    + do_each_thread(g, p) {
    + if (!freezeable(p, do_all_threads))
    + continue;
    +
    + n = kmalloc(sizeof(struct notifier_block),
    + GFP_ATOMIC);
    +
    + if (n) {
    + n->notifier_call = freeze_process;
    + n->priority = 0;
    + notifier_chain_register(&p->todo, n);
    + }
    + } while_each_thread(g, p);
    + read_unlock(&tasklist_lock);
    +}
    +
    static inline void freeze(struct task_struct *p)
    {
    unsigned long flags;
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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