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ntdll: Implement thread-ID alerts using futexes if possible.

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Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2021-11-16 21:50:43 -06:00 committed by Alexandre Julliard
parent 6d19056a8c
commit 9d79f72142
1 changed files with 76 additions and 0 deletions
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76
dlls/ntdll/unix/sync.c
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@ -2342,6 +2342,9 @@ NTSTATUS WINAPI NtQueryInformationAtom( RTL_ATOM atom, ATOM_INFORMATION_CLASS cl
union tid_alert_entry
{
HANDLE event;
#ifdef __linux__
int futex;
#endif
};
#define TID_ALERT_BLOCK_SIZE (65536 / sizeof(union tid_alert_entry))
@ -2376,6 +2379,11 @@ static union tid_alert_entry *get_tid_alert_entry( HANDLE tid )
entry = &tid_alert_blocks[block_idx][idx % TID_ALERT_BLOCK_SIZE];
#ifdef __linux__
if (use_futexes())
return entry;
#endif
if (!entry->event)
{
HANDLE event;
@ -2401,10 +2409,43 @@ NTSTATUS WINAPI NtAlertThreadByThreadId( HANDLE tid )
if (!entry) return STATUS_INVALID_CID;
#ifdef __linux__
if (use_futexes())
{
int *futex = &entry->futex;
if (!InterlockedExchange( futex, 1 ))
futex_wake( futex, 1 );
return STATUS_SUCCESS;
}
#endif
return NtSetEvent( entry->event, NULL );
}
#ifdef __linux__
static LONGLONG get_absolute_timeout( const LARGE_INTEGER *timeout )
{
LARGE_INTEGER now;
if (timeout->QuadPart >= 0) return timeout->QuadPart;
NtQuerySystemTime( &now );
return now.QuadPart - timeout->QuadPart;
}
static LONGLONG update_timeout( ULONGLONG end )
{
LARGE_INTEGER now;
LONGLONG timeleft;
NtQuerySystemTime( &now );
timeleft = end - now.QuadPart;
if (timeleft < 0) timeleft = 0;
return timeleft;
}
#endif
/***********************************************************************
* NtWaitForAlertByThreadId (NTDLL.@)
*/
@ -2417,6 +2458,41 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
if (!entry) return STATUS_INVALID_CID;
#ifdef __linux__
if (use_futexes())
{
int *futex = &entry->futex;
ULONGLONG end;
int ret;
if (timeout)
{
if (timeout->QuadPart == TIMEOUT_INFINITE)
timeout = NULL;
else
end = get_absolute_timeout( timeout );
}
while (!InterlockedExchange( futex, 0 ))
{
if (timeout)
{
LONGLONG timeleft = update_timeout( end );
struct timespec timespec;
timespec.tv_sec = timeleft / (ULONGLONG)TICKSPERSEC;
timespec.tv_nsec = (timeleft % TICKSPERSEC) * 100;
ret = futex_wait( futex, 0, &timespec );
}
else
ret = futex_wait( futex, 0, NULL );
if (ret == -1 && errno == ETIMEDOUT) return STATUS_TIMEOUT;
}
return STATUS_ALERTED;
}
#endif
status = NtWaitForSingleObject( entry->event, FALSE, timeout );
if (!status) return STATUS_ALERTED;
return status;