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ntsync: Introduce NTSYNC_IOC_EVENT_PULSE.

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This corresponds to the NT syscall NtPulseEvent().

This wakes up any waiters as if the event had been set, but does not set the
event, instead resetting it if it had been signalled. Thus, for a manual-reset
event, all waiters are woken, whereas for an auto-reset event, at most one
waiter is woken.

Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241213193511.457338-12-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Elizabeth Figura 2024-12-13 13:34:52 -06:00 • committed by Greg Kroah-Hartman
parent bbb9797514
commit 12b29d3008
2 changed files with 7 additions and 2 deletions
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8
drivers/misc/ntsync.c
View file

@ -534,7 +534,7 @@ static int ntsync_mutex_kill(struct ntsync_obj *mutex, void __user *argp)
return ret;
}
static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
static int ntsync_event_set(struct ntsync_obj *event, void __user *argp, bool pulse)
{
struct ntsync_device *dev = event->dev;
__u32 prev_state;
@ -550,6 +550,8 @@ static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
if (all)
try_wake_all_obj(dev, event);
try_wake_any_event(event);
if (pulse)
event->u.event.signaled = false;
ntsync_unlock_obj(dev, event, all);
@ -605,9 +607,11 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd,
case NTSYNC_IOC_MUTEX_KILL:
return ntsync_mutex_kill(obj, argp);
case NTSYNC_IOC_EVENT_SET:
return ntsync_event_set(obj, argp);
return ntsync_event_set(obj, argp, false);
case NTSYNC_IOC_EVENT_RESET:
return ntsync_event_reset(obj, argp);
case NTSYNC_IOC_EVENT_PULSE:
return ntsync_event_set(obj, argp, true);
default:
return -ENOIOCTLCMD;
}

1
include/uapi/linux/ntsync.h
View file

@ -50,5 +50,6 @@ struct ntsync_wait_args {
#define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32)
#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32)
#endif