diff --git a/dlls/msvcp100/msvcp100.spec b/dlls/msvcp100/msvcp100.spec
index a9530de654c..4601a3da66a 100644
--- a/dlls/msvcp100/msvcp100.spec
+++ b/dlls/msvcp100/msvcp100.spec
@@ -196,8 +196,8 @@
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@XZ
 @ stub -arch=win32 ??0_Mutex@std@@QAE@W4_Uninitialized@1@@Z
 @ stub -arch=win64 ??0_Mutex@std@@QEAA@W4_Uninitialized@1@@Z
-@ stub -arch=win32 ??0_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??0_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??0_Mutex@std@@QAE@XZ(ptr) msvcp90.??0_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??0_Mutex@std@@QEAA@XZ(ptr) msvcp90.??0_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??0_Runtime_object@details@Concurrency@@QAE@H@Z
 @ stub -arch=win64 ??0_Runtime_object@details@Concurrency@@QEAA@H@Z
 @ stub -arch=win32 ??0_Runtime_object@details@Concurrency@@QAE@XZ
@@ -316,8 +316,8 @@
 @ stub -arch=win64 ??1_Locinfo@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??1_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??1_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??1_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??1_Mutex@std@@QAE@XZ(ptr) msvcp90.??1_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??1_Mutex@std@@QEAA@XZ(ptr) msvcp90.??1_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Timevec@std@@QAE@XZ
 @ stub -arch=win64 ??1_Timevec@std@@QEAA@XZ
 @ stub -arch=win32 ??1_UShinit@std@@QAE@XZ
@@ -1080,8 +1080,8 @@
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@UEAAXXZ
 @ stub -arch=win32 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@UAEXXZ
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@UEAAXXZ
-@ stub -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QEAAXXZ
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@@Z
 @ stub -arch=win64 ?_Lockit_ctor@_Lockit@std@@CAXPEAV12@@Z
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@H@Z
@@ -1114,14 +1114,14 @@
 @ stub -arch=win64 ?_Mtx_new@threads@stdext@@YAXAEAPEAX@Z
 @ stub -arch=win32 ?_Mtx_unlock@threads@stdext@@YAXPAX@Z
 @ stub -arch=win64 ?_Mtx_unlock@threads@stdext@@YAXPEAX@Z
-@ stub -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z
 @ stub ?_Nomemory@std@@YAXXZ
 @ stub -arch=win32 ?_Orphan_all@_Container_base0@std@@QAEXXZ
 @ stub -arch=win64 ?_Orphan_all@_Container_base0@std@@QEAAXXZ
@@ -1225,8 +1225,8 @@
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@UEAAXXZ
 @ stub -arch=win32 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@UAEXXZ
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@UEAAXXZ
-@ stub -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QEAAXXZ
 @ stub ?_XLgamma@tr1@std@@YAMM@Z
 @ stub ?_XLgamma@tr1@std@@YANN@Z
 @ stub ?_XLgamma@tr1@std@@YAOO@Z
diff --git a/dlls/msvcp71/msvcp71.spec b/dlls/msvcp71/msvcp71.spec
index 4bcb174158a..a8bf5953d15 100644
--- a/dlls/msvcp71/msvcp71.spec
+++ b/dlls/msvcp71/msvcp71.spec
@@ -962,8 +962,8 @@
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@H@Z
 @ stub -arch=win32 ??0_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??0_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??0_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??0_Mutex@std@@QAE@XZ(ptr) msvcp90.??0_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??0_Mutex@std@@QEAA@XZ(ptr) msvcp90.??0_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??0_Timevec@std@@QAE@ABV01@@Z
 @ stub -arch=win64 ??0_Timevec@std@@QEAA@AEBV01@@Z
 @ stub -arch=win32 ??0_Timevec@std@@QAE@PAX@Z
@@ -1181,8 +1181,8 @@
 @ stub -arch=win64 ??1_Locinfo@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??1_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??1_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??1_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??1_Mutex@std@@QAE@XZ(ptr) msvcp90.??1_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??1_Mutex@std@@QEAA@XZ(ptr) msvcp90.??1_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Timevec@std@@QAE@XZ
 @ stub -arch=win64 ??1_Timevec@std@@QEAA@XZ
 @ stub -arch=win32 ??1_UShinit@std@@QAE@XZ
@@ -2309,8 +2309,8 @@
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QEAAXXZ
 @ stub -arch=win32 ?_Makpat@?$_Mpunct@D@std@@AAEXAAUpattern@money_base@2@III@Z
 @ stub -arch=win64 ?_Makpat@?$_Mpunct@D@std@@AEAAXAEAUpattern@money_base@2@III@Z
 @ stub -arch=win32 ?_Makpat@?$_Mpunct@G@std@@AAEXAAUpattern@money_base@2@III@Z
@@ -2463,8 +2463,8 @@
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QEAAXXZ
 @ stub ?_Xlen@_String_base@std@@QBEXXZ
 @ stub ?_Xran@_String_base@std@@QBEXXZ
 @ stub -arch=win32 ?always_noconv@codecvt_base@std@@QBE_NXZ
diff --git a/dlls/msvcp80/msvcp80.spec b/dlls/msvcp80/msvcp80.spec
index df10bcdf89a..03c8d7a8e95 100644
--- a/dlls/msvcp80/msvcp80.spec
+++ b/dlls/msvcp80/msvcp80.spec
@@ -1080,8 +1080,8 @@
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@H@Z
 @ stub -arch=win32 ??0_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??0_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??0_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??0_Mutex@std@@QAE@XZ(ptr) msvcp90.??0_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??0_Mutex@std@@QEAA@XZ(ptr) msvcp90.??0_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??0_Timevec@std@@QAE@ABV01@@Z
 @ stub -arch=win64 ??0_Timevec@std@@QEAA@AEBV01@@Z
 @ stub -arch=win32 ??0_Timevec@std@@QAE@PAX@Z
@@ -1316,8 +1316,8 @@
 @ stub -arch=win64 ??1_Locinfo@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??1_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??1_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??1_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??1_Mutex@std@@QAE@XZ(ptr) msvcp90.??1_Mutex@std@@QAE@XZ
+@ cdecl -arch=win64 ??1_Mutex@std@@QEAA@XZ(ptr) msvcp90.??1_Mutex@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Timevec@std@@QAE@XZ
 @ stub -arch=win64 ??1_Timevec@std@@QEAA@XZ
 @ stub -arch=win32 ??1_UShinit@std@@QAE@XZ
@@ -2580,8 +2580,8 @@
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Lock@_Mutex@std@@QEAAXXZ
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@@Z
 @ stub -arch=win64 ?_Lockit_ctor@_Lockit@std@@CAXPEAV12@@Z
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@H@Z
@@ -2610,14 +2610,14 @@
 @ cdecl -arch=win64 ?_Move_s@?$char_traits@G@std@@SAPEAGPEAG_KPEBG1@Z(ptr long ptr long) msvcp90.?_Move_s@?$char_traits@G@std@@SAPEAGPEAG_KPEBG1@Z
 @ cdecl -arch=win32 ?_Move_s@?$char_traits@_W@std@@SAPA_WPA_WIPB_WI@Z(ptr long ptr long) msvcp90.?_Move_s@?$char_traits@_W@std@@SAPA_WPA_WIPB_WI@Z
 @ cdecl -arch=win64 ?_Move_s@?$char_traits@_W@std@@SAPEA_WPEA_W_KPEB_W1@Z(ptr long ptr long) msvcp90.?_Move_s@?$char_traits@_W@std@@SAPEA_WPEA_W_KPEB_W1@Z
-@ stub -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z(ptr) msvcp90.?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z
+@ cdecl -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z(ptr) msvcp90.?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z
 @ stub -arch=win32 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IAEPADXZ
 @ stub -arch=win64 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IEAAPEADXZ
 @ stub -arch=win32 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IBEPBDXZ
@@ -2818,8 +2818,8 @@
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QAEXXZ
+@ cdecl -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ(ptr) msvcp90.?_Unlock@_Mutex@std@@QEAAXXZ
 @ stub -arch=win32 ?_Wcerr_func@std@@YAAAV?$basic_ostream@GU?$char_traits@G@std@@@1@XZ
 @ stub -arch=win64 ?_Wcerr_func@std@@YAAEAV?$basic_ostream@GU?$char_traits@G@std@@@1@XZ
 @ stub -arch=win32 ?_Wcerr_func@std@@YAAAV?$basic_ostream@_WU?$char_traits@_W@std@@@1@XZ
diff --git a/dlls/msvcp90/Makefile.in b/dlls/msvcp90/Makefile.in
index 38d917f9c99..3eda5dc5e3f 100644
--- a/dlls/msvcp90/Makefile.in
+++ b/dlls/msvcp90/Makefile.in
@@ -8,6 +8,7 @@ C_SRCS = \
 	ios.c \
 	math.c \
 	memory.c \
+	misc.c \
 	msvcp90_main.c \
 	string.c
 
diff --git a/dlls/msvcp90/misc.c b/dlls/msvcp90/misc.c
new file mode 100644
index 00000000000..8f7a835f6b3
--- /dev/null
+++ b/dlls/msvcp90/misc.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2010 Piotr Caban for CodeWeavers
+ *
+ * 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 "config.h"
+
+#include <stdarg.h>
+#include <limits.h>
+
+#include "msvcp90.h"
+
+#include "windef.h"
+#include "winbase.h"
+
+typedef struct {
+    void *mutex;
+} mutex;
+
+/* ??0_Mutex@std@@QAE@XZ */
+/* ??0_Mutex@std@@QEAA@XZ */
+DEFINE_THISCALL_WRAPPER(mutex_ctor, 4)
+mutex* __thiscall mutex_ctor(mutex *this)
+{
+    this->mutex = CreateMutexW(NULL, FALSE, NULL);
+    return this;
+}
+
+/* ??1_Mutex@std@@QAE@XZ */
+/* ??1_Mutex@std@@QEAA@XZ */
+DEFINE_THISCALL_WRAPPER(mutex_dtor, 4)
+void __thiscall mutex_dtor(mutex *this)
+{
+    CloseHandle(this->mutex);
+}
+
+/* ?_Lock@_Mutex@std@@QAEXXZ */
+/* ?_Lock@_Mutex@std@@QEAAXXZ */
+DEFINE_THISCALL_WRAPPER(mutex_lock, 4)
+void __thiscall mutex_lock(mutex *this)
+{
+    WaitForSingleObject(this->mutex, INFINITE);
+}
+
+/* ?_Unlock@_Mutex@std@@QAEXXZ */
+/* ?_Unlock@_Mutex@std@@QEAAXXZ */
+DEFINE_THISCALL_WRAPPER(mutex_unlock, 4)
+void __thiscall mutex_unlock(mutex *this)
+{
+    ReleaseMutex(this->mutex);
+}
+
+/* ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z */
+/* ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z */
+void CDECL mutex_mutex_lock(mutex *m)
+{
+    mutex_lock(m);
+}
+
+/* ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z */
+/* ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z */
+void CDECL mutex_mutex_unlock(mutex *m)
+{
+    mutex_unlock(m);
+}
+
+/* ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z */
+/* ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z */
+void CDECL mutex_mutex_ctor(mutex *m)
+{
+    mutex_ctor(m);
+}
+
+/* ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z */
+/* ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z */
+void CDECL mutex_mutex_dtor(mutex *m)
+{
+    mutex_dtor(m);
+}
diff --git a/dlls/msvcp90/msvcp90.spec b/dlls/msvcp90/msvcp90.spec
index cc7e5b2210f..a700d9e2877 100644
--- a/dlls/msvcp90/msvcp90.spec
+++ b/dlls/msvcp90/msvcp90.spec
@@ -1082,8 +1082,8 @@
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@H@Z
 @ stub -arch=win32 ??0_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??0_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??0_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??0_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??0_Mutex@std@@QAE@XZ(ptr) mutex_ctor
+@ cdecl -arch=win64 ??0_Mutex@std@@QEAA@XZ(ptr) mutex_ctor
 @ stub -arch=win32 ??0_Timevec@std@@QAE@ABV01@@Z
 @ stub -arch=win64 ??0_Timevec@std@@QEAA@AEBV01@@Z
 @ stub -arch=win32 ??0_Timevec@std@@QAE@PAX@Z
@@ -1318,8 +1318,8 @@
 @ stub -arch=win64 ??1_Locinfo@std@@QEAA@XZ
 @ stub -arch=win32 ??1_Lockit@std@@QAE@XZ
 @ stub -arch=win64 ??1_Lockit@std@@QEAA@XZ
-@ stub -arch=win32 ??1_Mutex@std@@QAE@XZ
-@ stub -arch=win64 ??1_Mutex@std@@QEAA@XZ
+@ thiscall -arch=win32 ??1_Mutex@std@@QAE@XZ(ptr) mutex_dtor
+@ cdecl -arch=win64 ??1_Mutex@std@@QEAA@XZ(ptr) mutex_dtor
 @ stub -arch=win32 ??1_Timevec@std@@QAE@XZ
 @ stub -arch=win64 ??1_Timevec@std@@QEAA@XZ
 @ stub -arch=win32 ??1_UShinit@std@@QAE@XZ
@@ -2597,8 +2597,8 @@
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Lock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Lock@_Mutex@std@@QAEXXZ(ptr) mutex_lock
+@ cdecl -arch=win64 ?_Lock@_Mutex@std@@QEAAXXZ(ptr) mutex_lock
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@@Z
 @ stub -arch=win64 ?_Lockit_ctor@_Lockit@std@@CAXPEAV12@@Z
 @ stub -arch=win32 ?_Lockit_ctor@_Lockit@std@@CAXPAV12@H@Z
@@ -2635,14 +2635,14 @@
 @ cdecl -arch=win64 ?_Move_s@?$char_traits@G@std@@SAPEAGPEAG_KPEBG1@Z(ptr long ptr long) MSVCP_char_traits_short__Move_s
 @ cdecl -arch=win32 ?_Move_s@?$char_traits@_W@std@@SAPA_WPA_WIPB_WI@Z(ptr long ptr long) MSVCP_char_traits_wchar__Move_s
 @ cdecl -arch=win64 ?_Move_s@?$char_traits@_W@std@@SAPEA_WPEA_W_KPEB_W1@Z(ptr long ptr long) MSVCP_char_traits_wchar__Move_s
-@ stub -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z
-@ stub -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z
-@ stub -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z
+@ cdecl -arch=win32 ?_Mutex_Lock@_Mutex@std@@CAXPAV12@@Z(ptr) mutex_mutex_lock
+@ cdecl -arch=win64 ?_Mutex_Lock@_Mutex@std@@CAXPEAV12@@Z(ptr) mutex_mutex_lock
+@ cdecl -arch=win32 ?_Mutex_Unlock@_Mutex@std@@CAXPAV12@@Z(ptr) mutex_mutex_unlock
+@ cdecl -arch=win64 ?_Mutex_Unlock@_Mutex@std@@CAXPEAV12@@Z(ptr) mutex_mutex_unlock
+@ cdecl -arch=win32 ?_Mutex_ctor@_Mutex@std@@CAXPAV12@@Z(ptr) mutex_mutex_ctor
+@ cdecl -arch=win64 ?_Mutex_ctor@_Mutex@std@@CAXPEAV12@@Z(ptr) mutex_mutex_ctor
+@ cdecl -arch=win32 ?_Mutex_dtor@_Mutex@std@@CAXPAV12@@Z(ptr) mutex_mutex_dtor
+@ cdecl -arch=win64 ?_Mutex_dtor@_Mutex@std@@CAXPEAV12@@Z(ptr) mutex_mutex_dtor
 @ stub -arch=win32 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IAEPADXZ
 @ stub -arch=win64 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IEAAPEADXZ
 @ stub -arch=win32 ?_Myptr@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IBEPBDXZ
@@ -2844,8 +2844,8 @@
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@GU?$char_traits@G@std@@@std@@QEAAXXZ
 @ stub -arch=win32 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QAEXXZ
 @ stub -arch=win64 ?_Unlock@?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@QEAAXXZ
-@ stub -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ
-@ stub -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ
+@ thiscall -arch=win32 ?_Unlock@_Mutex@std@@QAEXXZ(ptr) mutex_unlock
+@ cdecl -arch=win64 ?_Unlock@_Mutex@std@@QEAAXXZ(ptr) mutex_unlock
 @ stub -arch=win32 ?_Wcerr_func@std@@YAAAV?$basic_ostream@GU?$char_traits@G@std@@@1@XZ
 @ stub -arch=win64 ?_Wcerr_func@std@@YAAEAV?$basic_ostream@GU?$char_traits@G@std@@@1@XZ
 @ stub -arch=win32 ?_Wcerr_func@std@@YAAAV?$basic_ostream@_WU?$char_traits@_W@std@@@1@XZ