From: Tejun Heo Date: Thu, 2 Jun 2011 09:14:00 +0000 (+0200) Subject: job control: introduce task_set_jobctl_pending() X-Git-Tag: v3.1-rc1~308^2~32 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7dd3db54e77d21eb95e145f19ba53f68250d0e73;p=pandora-kernel.git job control: introduce task_set_jobctl_pending() task->jobctl currently hosts JOBCTL_STOP_PENDING and will host TRAP pending bits too. Setting pending conditions on a dying task may make the task unkillable. Currently, each setting site is responsible for checking for the condition but with to-be-added job control traps this becomes too fragile. This patch adds task_set_jobctl_pending() which should be used when setting task->jobctl bits to schedule a stop or trap. The function performs the followings to ease setting pending bits. * Sanity checks. * If fatal signal is pending or PF_EXITING is set, no bit is set. * STOP_SIGMASK is automatically cleared if new value is being set. do_signal_stop() and ptrace_attach() are updated to use task_set_jobctl_pending() instead of setting STOP_PENDING explicitly. The surrounding structures around setting are changed to fit task_set_jobctl_pending() better but there should be no userland visible behavior difference. Signed-off-by: Tejun Heo Cc: Oleg Nesterov Signed-off-by: Oleg Nesterov --- Reading git-diff-tree failed