diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2014-09-24 10:18:47 +0200 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-04-16 20:11:19 -0400 |
| commit | 32384effc14fcd45beacae7a586658b7af7c67e3 (patch) | |
| tree | 7354b13c972c39bcc0af3d3bf924d329767e17d5 /include | |
| parent | 2e7822fa339137f9db66d591cf099fa3525a8e5f (diff) | |
sched/wait: Provide infrastructure to deal with nested blocking
[ Upstream commit 61ada528dea028331e99e8ceaed87c683ad25de2 ]
There are a few places that call blocking primitives from wait loops,
provide infrastructure to support this without the typical
task_struct::state collision.
We record the wakeup in wait_queue_t::flags which leaves
task_struct::state free to be used by others.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: tglx@linutronix.de
Cc: ilya.dryomov@inktank.com
Cc: umgwanakikbuti@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140924082242.051202318@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/wait.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h index e4a8eb9312ea..fc0e99395fbb 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -13,9 +13,12 @@ typedef struct __wait_queue wait_queue_t; typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key); int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key); +/* __wait_queue::flags */ +#define WQ_FLAG_EXCLUSIVE 0x01 +#define WQ_FLAG_WOKEN 0x02 + struct __wait_queue { unsigned int flags; -#define WQ_FLAG_EXCLUSIVE 0x01 void *private; wait_queue_func_t func; struct list_head task_list; @@ -830,6 +833,8 @@ void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int sta long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_t *wait, int state); void finish_wait(wait_queue_head_t *q, wait_queue_t *wait); void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait, unsigned int mode, void *key); +long wait_woken(wait_queue_t *wait, unsigned mode, long timeout); +int woken_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |