diff --git a/dlls/wow64/Makefile.in b/dlls/wow64/Makefile.in
index 8dc4dac5ba7..76e3ff97d6b 100644
--- a/dlls/wow64/Makefile.in
+++ b/dlls/wow64/Makefile.in
@@ -5,4 +5,5 @@ IMPORTS   = ntdll winecrt0
 EXTRADLLFLAGS = -nodefaultlibs -mno-cygwin -Wl,--image-base,0x6f000000
 
 C_SRCS = \
+	sync.c \
 	syscall.c
diff --git a/dlls/wow64/struct32.h b/dlls/wow64/struct32.h
new file mode 100644
index 00000000000..e8b2e22cdcf
--- /dev/null
+++ b/dlls/wow64/struct32.h
@@ -0,0 +1,34 @@
+/*
+ * 32-bit version of ntdll structures
+ *
+ * Copyright 2021 Alexandre Julliard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifndef __WOW64_STRUCT32_H
+#define __WOW64_STRUCT32_H
+
+typedef struct
+{
+    ULONG Length;
+    ULONG RootDirectory;
+    ULONG ObjectName;
+    ULONG Attributes;
+    ULONG SecurityDescriptor;
+    ULONG SecurityQualityOfService;
+} OBJECT_ATTRIBUTES32;
+
+#endif /* __WOW64_STRUCT32_H */
diff --git a/dlls/wow64/sync.c b/dlls/wow64/sync.c
new file mode 100644
index 00000000000..d61eed0a22d
--- /dev/null
+++ b/dlls/wow64/sync.c
@@ -0,0 +1,133 @@
+/*
+ * WoW64 synchronization objects and functions
+ *
+ * Copyright 2021 Alexandre Julliard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdarg.h>
+
+#include "ntstatus.h"
+#define WIN32_NO_STATUS
+#include "windef.h"
+#include "winbase.h"
+#include "winnt.h"
+#include "winternl.h"
+#include "wow64_private.h"
+
+
+/**********************************************************************
+ *           wow64_NtClearEvent
+ */
+NTSTATUS WINAPI wow64_NtClearEvent( UINT *args )
+{
+    HANDLE handle = get_handle( &args );
+
+    return NtClearEvent( handle );
+}
+
+
+/**********************************************************************
+ *           wow64_NtCreateEvent
+ */
+NTSTATUS WINAPI wow64_NtCreateEvent( UINT *args )
+{
+    ULONG *handle_ptr = get_ptr( &args );
+    ACCESS_MASK access = get_ulong( &args );
+    OBJECT_ATTRIBUTES32 *attr32 = get_ptr( &args );
+    EVENT_TYPE type = get_ulong( &args );
+    BOOLEAN state = get_ulong( &args );
+
+    struct object_attr64 attr;
+    HANDLE handle = 0;
+    NTSTATUS status;
+
+    *handle_ptr = 0;
+    status = NtCreateEvent( &handle, access, objattr_32to64( &attr, attr32 ), type, state );
+    put_handle( handle_ptr, handle );
+    return status;
+}
+
+
+/**********************************************************************
+ *           wow64_NtOpenEvent
+ */
+NTSTATUS WINAPI wow64_NtOpenEvent( UINT *args )
+{
+    ULONG *handle_ptr = get_ptr( &args );
+    ACCESS_MASK access = get_ulong( &args );
+    OBJECT_ATTRIBUTES32 *attr32 = get_ptr( &args );
+
+    struct object_attr64 attr;
+    HANDLE handle = 0;
+    NTSTATUS status;
+
+    *handle_ptr = 0;
+    status = NtOpenEvent( &handle, access, objattr_32to64( &attr, attr32 ));
+    put_handle( handle_ptr, handle );
+    return status;
+}
+
+
+/**********************************************************************
+ *           wow64_NtPulseEvent
+ */
+NTSTATUS WINAPI wow64_NtPulseEvent( UINT *args )
+{
+    HANDLE handle = get_handle( &args );
+    LONG *prev_state = get_ptr( &args );
+
+    return NtPulseEvent( handle, prev_state );
+}
+
+
+/**********************************************************************
+ *           wow64_NtQueryEvent
+ */
+NTSTATUS WINAPI wow64_NtQueryEvent( UINT *args )
+{
+    HANDLE handle = get_handle( &args );
+    EVENT_INFORMATION_CLASS class = get_ulong( &args );
+    void *info = get_ptr( &args );
+    ULONG len = get_ulong( &args );
+    ULONG *retlen = get_ptr( &args );
+
+    return NtQueryEvent( handle, class, info, len, retlen );
+}
+
+
+/**********************************************************************
+ *           wow64_NtResetEvent
+ */
+NTSTATUS WINAPI wow64_NtResetEvent( UINT *args )
+{
+    HANDLE handle = get_handle( &args );
+    LONG *prev_state = get_ptr( &args );
+
+    return NtResetEvent( handle, prev_state );
+}
+
+
+/**********************************************************************
+ *           wow64_NtSetEvent
+ */
+NTSTATUS WINAPI wow64_NtSetEvent( UINT *args )
+{
+    HANDLE handle = get_handle( &args );
+    LONG *prev_state = get_ptr( &args );
+
+    return NtSetEvent( handle, prev_state );
+}
diff --git a/dlls/wow64/syscall.h b/dlls/wow64/syscall.h
index 583af0db476..df9da2261bb 100644
--- a/dlls/wow64/syscall.h
+++ b/dlls/wow64/syscall.h
@@ -25,15 +25,22 @@
     SYSCALL_ENTRY( NtAddAtom ) \
     SYSCALL_ENTRY( NtAllocateLocallyUniqueId ) \
     SYSCALL_ENTRY( NtAllocateUuids ) \
+    SYSCALL_ENTRY( NtClearEvent ) \
     SYSCALL_ENTRY( NtClose ) \
+    SYSCALL_ENTRY( NtCreateEvent ) \
     SYSCALL_ENTRY( NtDeleteAtom ) \
     SYSCALL_ENTRY( NtFindAtom ) \
     SYSCALL_ENTRY( NtGetCurrentProcessorNumber ) \
+    SYSCALL_ENTRY( NtOpenEvent ) \
+    SYSCALL_ENTRY( NtPulseEvent ) \
     SYSCALL_ENTRY( NtQueryDefaultLocale ) \
     SYSCALL_ENTRY( NtQueryDefaultUILanguage ) \
+    SYSCALL_ENTRY( NtQueryEvent ) \
     SYSCALL_ENTRY( NtQueryInformationAtom ) \
     SYSCALL_ENTRY( NtQueryInstallUILanguage ) \
+    SYSCALL_ENTRY( NtResetEvent ) \
     SYSCALL_ENTRY( NtSetDefaultLocale ) \
-    SYSCALL_ENTRY( NtSetDefaultUILanguage )
+    SYSCALL_ENTRY( NtSetDefaultUILanguage ) \
+    SYSCALL_ENTRY( NtSetEvent )
 
 #endif /* __WOW64_SYSCALL_H */
diff --git a/dlls/wow64/wow64_private.h b/dlls/wow64/wow64_private.h
index c441f1bf481..affd39df03b 100644
--- a/dlls/wow64/wow64_private.h
+++ b/dlls/wow64/wow64_private.h
@@ -22,6 +22,7 @@
 #define __WOW64_PRIVATE_H
 
 #include "syscall.h"
+#include "struct32.h"
 
 #define SYSCALL_ENTRY(func) extern NTSTATUS WINAPI wow64_ ## func( UINT *args ) DECLSPEC_HIDDEN;
 ALL_SYSCALLS
@@ -30,6 +31,13 @@ ALL_SYSCALLS
 extern USHORT native_machine DECLSPEC_HIDDEN;
 extern USHORT current_machine DECLSPEC_HIDDEN;
 
+struct object_attr64
+{
+    OBJECT_ATTRIBUTES   attr;
+    UNICODE_STRING      str;
+    SECURITY_DESCRIPTOR sd;
+};
+
 static inline void *get_rva( HMODULE module, DWORD va )
 {
     return (void *)((char *)module + va);
@@ -53,4 +61,59 @@ static inline ULONG get_ulong( UINT **args ) { return *(*args)++; }
 static inline HANDLE get_handle( UINT **args ) { return LongToHandle( *(*args)++ ); }
 static inline void *get_ptr( UINT **args ) { return ULongToPtr( *(*args)++ ); }
 
+static inline UNICODE_STRING *unicode_str_32to64( UNICODE_STRING *str, const UNICODE_STRING32 *str32 )
+{
+    if (!str32) return NULL;
+    str->Length = str32->Length;
+    str->MaximumLength = str32->MaximumLength;
+    str->Buffer = ULongToPtr( str32->Buffer );
+    return str;
+}
+
+static inline SECURITY_DESCRIPTOR *secdesc_32to64( SECURITY_DESCRIPTOR *out, const SECURITY_DESCRIPTOR *in )
+{
+    /* relative descr has the same layout for 32 and 64 */
+    const SECURITY_DESCRIPTOR_RELATIVE *sd = (const SECURITY_DESCRIPTOR_RELATIVE *)in;
+
+    if (!in) return NULL;
+    out->Revision = sd->Revision;
+    out->Sbz1     = sd->Sbz1;
+    out->Control  = sd->Control & ~SE_SELF_RELATIVE;
+    if (sd->Control & SE_SELF_RELATIVE)
+    {
+        if (sd->Owner) out->Owner = (PSID)((BYTE *)sd + sd->Owner);
+        if (sd->Group) out->Group = (PSID)((BYTE *)sd + sd->Group);
+        if ((sd->Control & SE_SACL_PRESENT) && sd->Sacl) out->Sacl = (PSID)((BYTE *)sd + sd->Sacl);
+        if ((sd->Control & SE_DACL_PRESENT) && sd->Dacl) out->Dacl = (PSID)((BYTE *)sd + sd->Dacl);
+    }
+    else
+    {
+        out->Owner = ULongToPtr( sd->Owner );
+        out->Group = ULongToPtr( sd->Group );
+        if (sd->Control & SE_SACL_PRESENT) out->Sacl = ULongToPtr( sd->Sacl );
+        if (sd->Control & SE_DACL_PRESENT) out->Dacl = ULongToPtr( sd->Dacl );
+    }
+    return out;
+}
+
+static inline OBJECT_ATTRIBUTES *objattr_32to64( struct object_attr64 *out, const OBJECT_ATTRIBUTES32 *in )
+{
+    memset( out, 0, sizeof(*out) );
+    if (!in) return NULL;
+    if (in->Length != sizeof(*in)) return &out->attr;
+
+    out->attr.Length = sizeof(out->attr);
+    out->attr.RootDirectory = LongToHandle( in->RootDirectory );
+    out->attr.Attributes = in->Attributes;
+    out->attr.ObjectName = unicode_str_32to64( &out->str, ULongToPtr( in->ObjectName ));
+    out->attr.SecurityQualityOfService = ULongToPtr( in->SecurityQualityOfService );
+    out->attr.SecurityDescriptor = secdesc_32to64( &out->sd, ULongToPtr( in->SecurityDescriptor ));
+    return &out->attr;
+}
+
+static inline void put_handle( ULONG *handle32, HANDLE handle )
+{
+    *handle32 = HandleToULong( handle );
+}
+
 #endif /* __WOW64_PRIVATE_H */