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| author |   Oleg Nesterov <oleg@redhat.com> | 2010-05-26 14:43:24 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:47 -0700 |
| commit | b3ac022cb9dc5883505a88b159d1b240ad1ef405 (patch) | |
| tree | bffa035303cbe3c5bde048ac3d3154fb57059e2d /include/linux/sched.h | |
| parent | keyctl_session_to_parent(): use thread_group_empty() to check singlethreadness (diff) | |
| download | linux-dev-b3ac022cb9dc5883505a88b159d1b240ad1ef405.tar.xz linux-dev-b3ac022cb9dc5883505a88b159d1b240ad1ef405.zip | |
proc: turn signal_struct->count into "int nr_threads"
No functional changes, just s/atomic_t count/int nr_threads/.
With the recent changes this counter has a single user, get_nr_threads()
And, none of its callers need the really accurate number of threads, not
to mention each caller obviously races with fork/exit. It is only used to
report this value to the user-space, except first_tid() uses it to avoid
the unnecessary while_each_thread() loop in the unlikely case.
It is a bit sad we need a word in struct signal_struct for this, perhaps
we can change get_nr_threads() to approximate the number of threads using
signal->live and kill ->nr_threads later.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index ccd2d1500720..f118809c953f 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -527,8 +527,8 @@ struct thread_group_cputimer { */ struct signal_struct { atomic_t sigcnt; - atomic_t count; atomic_t live; + int nr_threads; wait_queue_head_t wait_chldexit; /* for wait4() */ @@ -2149,7 +2149,7 @@ extern bool current_is_single_threaded(void); static inline int get_nr_threads(struct task_struct *tsk) { - return atomic_read(&tsk->signal->count); + return tsk->signal->nr_threads; } /* de_thread depends on thread_group_leader not being a pid based check */ |