Keep TlsDestructors within threads.c

This basically makes the threads implementation self-contained in threads.c and
threads.h, except for the UIntMap/RWLock implementations.

Alc/ALc.c

@@ -786,8 +786,6 @@ static void alc_init(void);
 static void alc_deinit(void);
 static void alc_deinit_safe(void);
 
-extern UIntMap TlsDestructors;
-
 #ifndef AL_LIBTYPE_STATIC
 BOOL APIENTRY DllMain(HINSTANCE hModule, DWORD reason, LPVOID lpReserved)
 {
@@ -797,7 +795,6 @@ BOOL APIENTRY DllMain(HINSTANCE hModule, DWORD reason, LPVOID lpReserved)
             /* Pin the DLL so we won't get unloaded until the process terminates */
             GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_PIN | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
                                (WCHAR*)hModule, &hModule);
-            InitUIntMap(&TlsDestructors, ~0);
             alc_init();
             break;
 
@@ -809,7 +806,6 @@ BOOL APIENTRY DllMain(HINSTANCE hModule, DWORD reason, LPVOID lpReserved)
                 alc_deinit();
             else
                 alc_deinit_safe();
-            ResetUIntMap(&TlsDestructors);
             break;
     }
     return TRUE;

Alc/rwlock.h

@@ -11,6 +11,7 @@ typedef struct {
     volatile ALenum read_entry_lock;
     volatile ALenum write_lock;
 } RWLock;
+#define RWLOCK_STATIC_INITIALIZE { 0, 0, AL_FALSE, AL_FALSE, AL_FALSE }
 
 void RWLockInit(RWLock *lock);
 void ReadLock(RWLock *lock);

Alc/threads.c

@@ -205,12 +205,17 @@ int almtx_timedlock(almtx_t *mtx, const struct timespec *ts)
  * function pointer in a ".CRT$XLx" section (where x is a character A to Z)
  * ensures the CRT will call it similar to DllMain.
  */
-UIntMap TlsDestructors;
+static UIntMap TlsDestructors = UINTMAP_STATIC_INITIALIZE;
 
 static void NTAPI altss_callback(void* UNUSED(handle), DWORD reason, void* UNUSED(reserved))
 {
     ALsizei i;
 
+    if(reason == DLL_PROCESS_DETACH)
+    {
+        ResetUIntMap(&TlsDestructors);
+        return;
+    }
     if(reason != DLL_THREAD_DETACH)
         return;
 

Alc/uintmap.h

@@ -14,6 +14,8 @@ typedef struct UIntMap {
     ALsizei limit;
     RWLock lock;
 } UIntMap;
+#define UINTMAP_STATIC_INITIALIZE_N(_n) { NULL, 0, 0, (_n), RWLOCK_STATIC_INITIALIZE }
+#define UINTMAP_STATIC_INITIALIZE UINTMAP_STATIC_INITIALIZE_N(~0)
 
 void InitUIntMap(UIntMap *map, ALsizei limit);
 void ResetUIntMap(UIntMap *map);