Marc-Aurel Zent : ntdll: Implement futex_wait() and futex_wake_one() on macOS.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 2fb62cf9a5328328e7291d00bce0f449046d3a79
URL:    https://gitlab.winehq.org/wine/wine/-/commit/2fb62cf9a5328328e7291d00bce0f44...

Author: Marc-Aurel Zent <mzent(a)codeweavers.com>
Date:   Tue Mar  5 14:12:51 2024 +0100

ntdll: Implement futex_wait() and futex_wake_one() on macOS.

---

 README.md              |  2 +-
 dlls/ntdll/unix/sync.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 8a804b30dfc..28ab8fe7299 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ To compile and run Wine, you must have one of the following:
 - FreeBSD 12.4 or later
 - Solaris x86 9 or later
 - NetBSD-current
-- Mac OS X 10.8 or later
+- Mac OS X 10.12 or later
 
 As Wine requires kernel-level thread support to run, only the operating
 systems mentioned above are supported.  Other operating systems which
diff --git a/dlls/ntdll/unix/sync.c b/dlls/ntdll/unix/sync.c
index 3a4eb21c3c4..21e66f01875 100644
--- a/dlls/ntdll/unix/sync.c
+++ b/dlls/ntdll/unix/sync.c
@@ -130,7 +130,71 @@ static inline int futex_wake_one( const LONG *addr )
     return syscall( __NR_futex, addr, FUTEX_WAKE_PRIVATE, 1, NULL, 0, 0 );
 }
 
-#endif /* __linux__ */
+#elif defined(__APPLE__)
+
+#define USE_FUTEX
+
+#include <AvailabilityMacros.h>
+
+#ifdef MAC_OS_VERSION_14_4
+#include <os/os_sync_wait_on_address.h>
+#endif
+
+#define UL_COMPARE_AND_WAIT 1
+
+extern int __ulock_wait( uint32_t operation, void *addr, uint64_t value, uint32_t timeout );
+
+extern int __ulock_wake( uint32_t operation, void *addr, uint64_t wake_value );
+
+static inline int futex_wait( const LONG *addr, int val, struct timespec *timeout )
+{
+#ifdef MAC_OS_VERSION_14_4
+    if (__builtin_available( macOS 14.4, * ))
+    {
+        /* 18446744073 seconds could overflow a uint64_t in nanoseconds */
+        if (timeout && timeout->tv_sec < 18446744073)
+        {
+            uint64_t ns_timeout = (timeout->tv_sec * 1000000000) + timeout->tv_nsec;
+
+            if (!ns_timeout)
+            {
+                errno = ETIMEDOUT;
+                return -1;
+            }
+            return os_sync_wait_on_address_with_timeout( (void *)addr, (uint64_t)val, 4, OS_SYNC_WAIT_ON_ADDRESS_NONE,
+                                                         OS_CLOCK_MACH_ABSOLUTE_TIME, ns_timeout );
+        }
+
+        return os_sync_wait_on_address( (void *)addr, (uint64_t)val, 4, OS_SYNC_WAIT_ON_ADDRESS_NONE );
+    }
+#endif
+
+    /* 4294 seconds could overflow a uint32_t in microseconds */
+    if (timeout && timeout->tv_sec < 4294)
+    {
+        uint32_t us_timeout = ((uint32_t)timeout->tv_sec * 1000000) + ((uint32_t)timeout->tv_nsec / 1000);
+
+        if (!us_timeout)
+        {
+            errno = ETIMEDOUT;
+            return -1;
+        }
+        return __ulock_wait( UL_COMPARE_AND_WAIT, (void *)addr, (uint64_t)val, us_timeout );
+    }
+
+    return __ulock_wait( UL_COMPARE_AND_WAIT, (void *)addr, (uint64_t)val, 0 );
+}
+
+static inline int futex_wake_one( const LONG *addr )
+{
+#ifdef MAC_OS_VERSION_14_4
+    if (__builtin_available( macOS 14.4, * ))
+        return os_sync_wake_by_address_any( (void *)addr, 4, OS_SYNC_WAKE_BY_ADDRESS_NONE );
+#endif
+    return __ulock_wake( UL_COMPARE_AND_WAIT, (void *)addr, 0 );
+}
+
+#endif /* __APPLE__ */
 
 /* create a struct security_descriptor and contained information in one contiguous piece of memory */
 unsigned int alloc_object_attributes( const OBJECT_ATTRIBUTES *attr, struct object_attributes **ret,