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ntdll: Assume process-private futexes are always present on Linux.

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Brendan Shanks 2024-02-01 09:39:14 -08:00 • committed by Alexandre Julliard
parent d93275c6ca
commit 455086e295
2 changed files with 17 additions and 44 deletions
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2
README.md
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@ -42,7 +42,7 @@ especially the wealth of information found at https://www.winehq.org.
To compile and run Wine, you must have one of the following:
- Linux version 2.0.36 or later
- Linux version 2.6.22 or later
- FreeBSD 12.4 or later
- Solaris x86 9 or later
- NetBSD-current

59
dlls/ntdll/unix/sync.c
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@ -103,10 +103,7 @@ static inline ULONGLONG monotonic_counter(void)
#ifdef __linux__
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
static int futex_private = 128;
#include <linux/futex.h>
static inline int futex_wait( const LONG *addr, int val, struct timespec *timeout )
{
@ -118,32 +115,15 @@ static inline int futex_wait( const LONG *addr, int val, struct timespec *timeou
long tv_nsec;
} timeout32 = { timeout->tv_sec, timeout->tv_nsec };
return syscall( __NR_futex, addr, FUTEX_WAIT | futex_private, val, &timeout32, 0, 0 );
return syscall( __NR_futex, addr, FUTEX_WAIT_PRIVATE, val, &timeout32, 0, 0 );
}
#endif
return syscall( __NR_futex, addr, FUTEX_WAIT | futex_private, val, timeout, 0, 0 );
return syscall( __NR_futex, addr, FUTEX_WAIT_PRIVATE, val, timeout, 0, 0 );
}
static inline int futex_wake( const LONG *addr, int val )
{
return syscall( __NR_futex, addr, FUTEX_WAKE | futex_private, val, NULL, 0, 0 );
}
static inline int use_futexes(void)
{
static LONG supported = -1;
if (supported == -1)
{
futex_wait( &supported, 10, NULL );
if (errno == ENOSYS)
{
futex_private = 0;
futex_wait( &supported, 10, NULL );
}
supported = (errno != ENOSYS);
}
return supported;
return syscall( __NR_futex, addr, FUTEX_WAKE_PRIVATE, val, NULL, 0, 0 );
}
#endif
@ -2356,11 +2336,10 @@ union tid_alert_entry
{
#ifdef HAVE_KQUEUE
int kq;
#elif defined(__linux__)
LONG futex;
#else
HANDLE event;
#ifdef __linux__
LONG futex;
#endif
#endif
};
@ -2426,12 +2405,9 @@ static union tid_alert_entry *get_tid_alert_entry( HANDLE tid )
if (InterlockedCompareExchange( (LONG *)&entry->kq, kq, 0 ))
close( kq );
}
#elif defined(__linux__)
return entry;
#else
#ifdef __linux__
if (use_futexes())
return entry;
#endif
if (!entry->event)
{
HANDLE event;
@ -2473,17 +2449,14 @@ NTSTATUS WINAPI NtAlertThreadByThreadId( HANDLE tid )
kevent( entry->kq, &signal_event, 1, NULL, 0, NULL );
return STATUS_SUCCESS;
}
#else
#ifdef __linux__
if (use_futexes())
#elif defined(__linux__)
{
LONG *futex = &entry->futex;
if (!InterlockedExchange( futex, 1 ))
futex_wake( futex, 1 );
return STATUS_SUCCESS;
}
#endif
#else
return NtSetEvent( entry->event, NULL );
#endif
}
@ -2571,14 +2544,12 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEGER *timeout )
{
union tid_alert_entry *entry = get_tid_alert_entry( NtCurrentTeb()->ClientId.UniqueThread );
NTSTATUS status;
TRACE( "%p %s\n", address, debugstr_timeout( timeout ) );
if (!entry) return STATUS_INVALID_CID;
#ifdef __linux__
if (use_futexes())
{
LONG *futex = &entry->futex;
ULONGLONG end;
@ -2610,11 +2581,13 @@ NTSTATUS WINAPI NtWaitForAlertByThreadId( const void *address, const LARGE_INTEG
}
return STATUS_ALERTED;
}
#else
{
NTSTATUS status = NtWaitForSingleObject( entry->event, FALSE, timeout );
if (!status) return STATUS_ALERTED;
return status;
}
#endif
status = NtWaitForSingleObject( entry->event, FALSE, timeout );
if (!status) return STATUS_ALERTED;
return status;
}
#endif