From aa55a08687059aa169d10a313c41f238c2070488 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 29 Sep 2005 19:58:53 +0400 Subject: [PATCH] fix TASK_STOPPED vs TASK_NONINTERACTIVE interaction do_signal_stop: for_each_thread(t) { if (t->state < TASK_STOPPED) ++sig->group_stop_count; } However, TASK_NONINTERACTIVE > TASK_STOPPED, so this loop will not count TASK_INTERRUPTIBLE | TASK_NONINTERACTIVE threads. See also wait_task_stopped(), which checks ->state > TASK_STOPPED. Signed-off-by: Oleg Nesterov [ We really probably should always use the appropriate bitmasks to test task states, not do it like this. Using something like #define TASK_RUNNABLE (TASK_RUNNING | TASK_INTERRUPTIBLE | \ TASK_UNINTERRUPTIBLE | TASK_NONINTERACTIVE) and then doing "if (task->state & TASK_RUNNABLE)" or similar. But the ordering of the task states is historical, and keeping the ordering does make sense regardless. ] Signed-off-by: Linus Torvalds --- include/linux/sched.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index 49e617fa0f66..afe6c61f13e5 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -110,11 +110,11 @@ extern unsigned long nr_iowait(void); #define TASK_RUNNING 0 #define TASK_INTERRUPTIBLE 1 #define TASK_UNINTERRUPTIBLE 2 -#define TASK_STOPPED 4 -#define TASK_TRACED 8 -#define EXIT_ZOMBIE 16 -#define EXIT_DEAD 32 -#define TASK_NONINTERACTIVE 64 +#define TASK_NONINTERACTIVE 4 +#define TASK_STOPPED 8 +#define TASK_TRACED 16 +#define EXIT_ZOMBIE 32 +#define EXIT_DEAD 64 #define __set_task_state(tsk, state_value) \ do { (tsk)->state = (state_value); } while (0) -- cgit v1.2.3-70-g09d2 From 4a8342d233a39ee582e9f7260e12d2f5fd194a05 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Thu, 29 Sep 2005 15:18:21 -0700 Subject: Revert task flag re-ordering, add comments Roland points out that the flags end up having non-obvious dependencies elsewhere, so revert aa55a08687059aa169d10a313c41f238c2070488 and add some comments about why things are as they are. We'll just have to fix up the broken comparisons. Roland has a patch. Signed-off-by: Linus Torvalds --- include/linux/sched.h | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index afe6c61f13e5..c3ba31f210a9 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -107,14 +107,26 @@ extern unsigned long nr_iowait(void); #include +/* + * Task state bitmask. NOTE! These bits are also + * encoded in fs/proc/array.c: get_task_state(). + * + * We have two separate sets of flags: task->state + * is about runnability, while task->exit_state are + * about the task exiting. Confusing, but this way + * modifying one set can't modify the other one by + * mistake. + */ #define TASK_RUNNING 0 #define TASK_INTERRUPTIBLE 1 #define TASK_UNINTERRUPTIBLE 2 -#define TASK_NONINTERACTIVE 4 -#define TASK_STOPPED 8 -#define TASK_TRACED 16 -#define EXIT_ZOMBIE 32 -#define EXIT_DEAD 64 +#define TASK_STOPPED 4 +#define TASK_TRACED 8 +/* in tsk->exit_state */ +#define EXIT_ZOMBIE 16 +#define EXIT_DEAD 32 +/* in tsk->state again */ +#define TASK_NONINTERACTIVE 64 #define __set_task_state(tsk, state_value) \ do { (tsk)->state = (state_value); } while (0) -- cgit v1.2.3-70-g09d2