9 files changed, 21 insertions, 2 deletions
diff --git a/Alc/backends/alsa.c b/Alc/backends/alsa.c
index c60187fa..0e0b4436 100644
--- a/Alc/backends/alsa.c
+++ b/Alc/backends/alsa.c
@@ -27,6 +27,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #include <alsa/asoundlib.h>
 
diff --git a/Alc/backends/base.h b/Alc/backends/base.h
index 272a3f65..22602b23 100644
--- a/Alc/backends/base.h
+++ b/Alc/backends/base.h
@@ -2,6 +2,7 @@
 #define AL_BACKENDS_BASE_H
 
 #include "alMain.h"
+#include "compat.h"
 
 
 struct ALCbackendVtable;
@@ -10,8 +11,12 @@ typedef struct ALCbackend {
     const struct ALCbackendVtable *vtbl;
 
     ALCdevice *mDevice;
+
+    CRITICAL_SECTION mMutex;
 } ALCbackend;
 
+void ALCbackend_Construct(ALCbackend *self, ALCdevice *device);
+void ALCbackend_Destruct(ALCbackend *self);
 ALint64 ALCbackend_getLatency(ALCbackend *self);
 void ALCbackend_lock(ALCbackend *self);
 void ALCbackend_unlock(ALCbackend *self);
diff --git a/Alc/backends/dsound.c b/Alc/backends/dsound.c
index f09967a0..9fa4bd61 100644
--- a/Alc/backends/dsound.c
+++ b/Alc/backends/dsound.c
@@ -35,6 +35,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #ifndef DSSPEAKER_5POINT1
 #   define DSSPEAKER_5POINT1          0x00000006
diff --git a/Alc/backends/mmdevapi.c b/Alc/backends/mmdevapi.c
index fb70d609..31be2ed1 100644
--- a/Alc/backends/mmdevapi.c
+++ b/Alc/backends/mmdevapi.c
@@ -41,6 +41,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 
 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM, 0x00000001, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
diff --git a/Alc/backends/null.c b/Alc/backends/null.c
index d21ebf0c..af68c585 100644
--- a/Alc/backends/null.c
+++ b/Alc/backends/null.c
@@ -28,6 +28,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #include "backends/base.h"
 
@@ -85,8 +86,14 @@ static ALuint ALCnullBackend_mixerProc(ALvoid *ptr)
 }
 
 
-static void ALCnullBackend_Destruct(ALCnullBackend* UNUSED(self))
+static void ALCnullBackend_Construct(ALCnullBackend *self, ALCdevice *device)
 {
+    ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device);
+}
+
+static void ALCnullBackend_Destruct(ALCnullBackend *self)
+{
+    ALCbackend_Destruct(STATIC_CAST(ALCbackend, self));
 }
 
 static ALCenum ALCnullBackend_open(ALCnullBackend *self, const ALCchar *name)
@@ -197,7 +204,7 @@ ALCbackend* ALCnullBackendFactory_createBackend(ALCnullBackendFactory* UNUSED(se
     if(!backend) return NULL;
     SET_VTABLE2(ALCnullBackend, ALCbackend, backend);
 
-    STATIC_CAST(ALCbackend, backend)->mDevice = device;
+    ALCnullBackend_Construct(backend, device);
 
     return STATIC_CAST(ALCbackend, backend);
 }
diff --git a/Alc/backends/oss.c b/Alc/backends/oss.c
index 35ae80cc..a9510a35 100644
--- a/Alc/backends/oss.c
+++ b/Alc/backends/oss.c
@@ -34,6 +34,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #include <sys/soundcard.h>
 
diff --git a/Alc/backends/pulseaudio.c b/Alc/backends/pulseaudio.c
index 4dc016a1..c24b86e2 100644
--- a/Alc/backends/pulseaudio.c
+++ b/Alc/backends/pulseaudio.c
@@ -26,6 +26,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #include <pulse/pulseaudio.h>
 
diff --git a/Alc/backends/solaris.c b/Alc/backends/solaris.c
index c6fd32e9..c4d40273 100644
--- a/Alc/backends/solaris.c
+++ b/Alc/backends/solaris.c
@@ -34,6 +34,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 #include <sys/audioio.h>
 
diff --git a/Alc/backends/wave.c b/Alc/backends/wave.c
index e7698430..ec88862b 100644
--- a/Alc/backends/wave.c
+++ b/Alc/backends/wave.c
@@ -31,6 +31,7 @@
 #include "alMain.h"
 #include "alu.h"
 #include "threads.h"
+#include "compat.h"
 
 
 typedef struct {