diff --git a/manifest b/manifest
index 57619c3f91..635f1985a7 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Cleanup\sthe\sWindows\ssyscall\stable,\sremoving\sthe\sunused\sCreateFileMapping\sentry.
-D 2012-03-13T01:30:20.255
+C Defer\screation\sof\sthe\ssleep\sevent\sobject\suntil\sit\sis\sneeded.\s\sAdded\ssqlite3_win32_write_debug\sand\ssqlite3_win32_sleep\sAPIs\sto\sassist\sin\sportability\sto\sWinRT.
+D 2012-03-13T03:35:07.176
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 2f37e468503dbe79d35c9f6dffcf3fae1ae9ec20
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -160,14 +160,14 @@ F src/mutex.h 2a79e0c10c26412546b501ee0f3d92b42decf63e
 F src/mutex_noop.c 7682796b7d8d39bf1c138248858efcd10c9e1553
 F src/mutex_os2.c 882d735098c07c8c6a5472b8dd66e19675fe117f
 F src/mutex_unix.c c3a4e00f96ba068a8dbef34084465979aaf369cc
-F src/mutex_w32.c be6dc2be432aa27e1b0d0a19a0da7bace9e4e441
+F src/mutex_w32.c 1170f64d08dc35cd43f6d0bfa833cac5da979279
 F src/notify.c 976dd0f6171d4588e89e874fcc765e92914b6d30
 F src/os.c e1acdc09ff3ac2412945cca9766e2dcf4675f31c
 F src/os.h 38aabd5e3ecd4162332076f55bb09cec02165cca
 F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
 F src/os_os2.c 4a75888ba3dfc820ad5e8177025972d74d7f2440
 F src/os_unix.c 0e3d2942d228d0366fb80a3640f35caf413b66d1
-F src/os_win.c 8e0c3142f06e049cead46bc1d83bbc939f582a67
+F src/os_win.c 30a479f366f206b663d4d5a6c647aa76d18055d0
 F src/pager.c 3955b62cdb5bb64559607cb474dd12a6c8e1d4a5
 F src/pager.h ef1eaf8593e78f73885c1dfac27ad83bee23bdc5
 F src/parse.y 1ddd71ae55f4b7cbb2672526ea4de023de0f519e
@@ -992,7 +992,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh 9f406d66e750e8ac031c63a9ef3248aaa347ef2a
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P 6b997d9c32076c480ff4f101ff93bae3f443e252
-R 6cc20b48ffd82e276454874a3dd9ea0d
+P fb7d8bf6ec5c0ef9a948bc14c28770e34f57db1a
+R 4746d41be07bb3c220103324ba770fee
 U mistachkin
-Z b8edd09153177d0ea866248aa43a320b
+Z d05d3c51b5da1f2a8562520fe1f66220
diff --git a/manifest.uuid b/manifest.uuid
index 85fee2b70b..98bbae7cfa 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-fb7d8bf6ec5c0ef9a948bc14c28770e34f57db1a
\ No newline at end of file
+7af88ad306612dd316827c506dbf8df7477b2ec1
\ No newline at end of file
diff --git a/src/mutex_w32.c b/src/mutex_w32.c
index 4c3855faf4..3717900608 100644
--- a/src/mutex_w32.c
+++ b/src/mutex_w32.c
@@ -109,6 +109,8 @@ static int winMutex_isInit = 0;
 */
 static long winMutex_lock = 0;
 
+extern void sqlite3_win32_sleep(DWORD milliseconds); /* os_win.c */
+
 static int winMutexInit(void){ 
   /* The first to increment to 1 does actual initialization */
   if( InterlockedCompareExchange(&winMutex_lock, 1, 0)==0 ){
@@ -124,11 +126,7 @@ static int winMutexInit(void){
   }else{
     /* Someone else is in the process of initing the static mutexes */
     while( !winMutex_isInit ){
-#if SQLITE_OS_WINRT
-      Yield(); /* NOP */
-#else
-      Sleep(1);
-#endif
+      sqlite3_win32_sleep(1);
     }
   }
   return SQLITE_OK; 
diff --git a/src/os_win.c b/src/os_win.c
index 35e3634e6f..3f676c7df6 100644
--- a/src/os_win.c
+++ b/src/os_win.c
@@ -24,6 +24,13 @@
 */
 #include "os_common.h"
 
+/*
+** Macro to find the minimum of two numeric values.
+*/
+#ifndef MIN
+# define MIN(x,y) ((x)<(y)?(x):(y))
+#endif
+
 /*
 ** Some Microsoft compilers lack this definition.
 */
@@ -87,6 +94,13 @@ struct winFile {
 #define WINFILE_PERSIST_WAL     0x04   /* Persistent WAL mode */
 #define WINFILE_PSOW            0x10   /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */
 
+/*
+ * The size of the buffer used by sqlite3_win32_write_debug().
+ */
+#ifndef SQLITE_WIN32_DBG_BUF_SIZE
+#  define SQLITE_WIN32_DBG_BUF_SIZE   (4096-sizeof(DWORD))
+#endif
+
 /*
  * If compiled with SQLITE_WIN32_MALLOC on Windows, we will use the
  * various Win32 API heap functions instead of our own.
@@ -748,6 +762,22 @@ static struct win_syscall {
 #define osGetNativeSystemInfo ((VOID(WINAPI*)( \
         LPSYSTEM_INFO))aSyscall[68].pCurrent)
 
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  { "OutputDebugStringA",      (SYSCALL)OutputDebugStringA,      0 },
+#else
+  { "OutputDebugStringA",      (SYSCALL)0,                       0 },
+#endif
+
+#define osOutputDebugStringA ((VOID(WINAPI*)(LPCSTR))aSyscall[69].pCurrent)
+
+#if defined(SQLITE_WIN32_HAS_WIDE)
+  { "OutputDebugStringW",      (SYSCALL)OutputDebugStringW,      0 },
+#else
+  { "OutputDebugStringW",      (SYSCALL)0,                       0 },
+#endif
+
+#define osOutputDebugStringW ((VOID(WINAPI*)(LPCWSTR))aSyscall[70].pCurrent)
+
 }; /* End of the overrideable system calls */
 
 /*
@@ -834,20 +864,62 @@ static const char *winNextSystemCall(sqlite3_vfs *p, const char *zName){
 }
 
 /*
-** The following routine Suspends the thread for at least ms milliseconds.  This is equivalent
-** to the win32 Sleep() interface.
+** This function outputs the specified (ANSI) string to the Win32 debugger
+** (if available).
+*/
+
+void sqlite3_win32_write_debug(char *zBuf, int nBuf){
+  char zDbgBuf[SQLITE_WIN32_DBG_BUF_SIZE];
+  int nMin = MIN(nBuf,SQLITE_WIN32_DBG_BUF_SIZE-1); /* may be negative. */
+  if( nMin<-1 ) nMin = -1; /* all negative values become -1. */
+#if defined(SQLITE_WIN32_HAS_ANSI)
+  if( nMin>0 ){
+    memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+    memcpy(zDbgBuf, zBuf, nMin);
+    OutputDebugStringA(zDbgBuf);
+  }else{
+    OutputDebugStringA(zBuf);
+  }
+#elif defined(SQLITE_WIN32_HAS_WIDE)
+  memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+  if ( osMultiByteToWideChar(
+          osAreFileApisANSI() ? CP_ACP : CP_OEMCP, 0, zBuf,
+          nMin, zDbgBuf, SQLITE_WIN32_DBG_BUF_SIZE/sizeof(WCHAR))<=0 ){
+    return;
+  }
+  OutputDebugStringW(zDbgBuf);
+#else
+  if( nMin>0 ){
+    memset(zDbgBuf, 0, SQLITE_WIN32_DBG_BUF_SIZE);
+    memcpy(zDbgBuf, zBuf, nMin);
+    fprintf(stderr, "%s", zDbgBuf);
+  }else{
+    fprintf(stderr, "%s", zBuf);
+  }
+#endif
+}
+
+/*
+** The following routine suspends the current thread for at least ms
+** milliseconds.  This is equivalent to the Win32 Sleep() interface.
 */
 #if SQLITE_OS_WINRT
-static HANDLE sleepObj;
-static void portableSleep(int ms){
-  osWaitForSingleObjectEx(sleepObj, ms, FALSE);
-}
-#else
-static void portableSleep(int ms){
-  osSleep(ms); 
-}
+static HANDLE sleepObj = NULL;
 #endif
 
+void sqlite3_win32_sleep(DWORD milliseconds){
+#if SQLITE_OS_WINRT
+  if ( sleepObj==NULL ){
+    sleepObj = osCreateEventExW(NULL, NULL, CREATE_EVENT_MANUAL_RESET,
+                                SYNCHRONIZE);
+  }
+  assert( sleepObj!=NULL );
+  osWaitForSingleObjectEx(sleepObj, milliseconds, FALSE);
+#else
+  osSleep(milliseconds);
+#endif
+}
+
 /*
 ** Return true (non-zero) if we are running under WinNT, Win2K, WinXP,
 ** or WinCE.  Return false (zero) for Win95, Win98, or WinME.
@@ -1351,7 +1423,7 @@ static int retryIoerr(int *pnRetry, DWORD *pError){
   if( e==ERROR_ACCESS_DENIED ||
       e==ERROR_LOCK_VIOLATION ||
       e==ERROR_SHARING_VIOLATION ){
-    portableSleep(win32IoerrRetryDelay*(1+*pnRetry));
+    sqlite3_win32_sleep(win32IoerrRetryDelay*(1+*pnRetry));
     ++*pnRetry;
     return 1;
   }
@@ -1824,7 +1896,7 @@ static int winClose(sqlite3_file *id){
   do{
     rc = osCloseHandle(pFile->h);
     /* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */
-  }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (portableSleep(100), 1) );
+  }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (sqlite3_win32_sleep(100), 1) );
 #if SQLITE_OS_WINCE
 #define WINCE_DELETION_ATTEMPTS 3
   winceDestroyLock(pFile);
@@ -1835,7 +1907,7 @@ static int winClose(sqlite3_file *id){
         && osGetFileAttributesW(pFile->zDeleteOnClose)!=0xffffffff 
         && cnt++ < WINCE_DELETION_ATTEMPTS
     ){
-       portableSleep(100);  /* Wait a little before trying again */
+       sqlite3_win32_sleep(100);  /* Wait a little before trying again */
     }
     sqlite3_free(pFile->zDeleteOnClose);
   }
@@ -2238,7 +2310,7 @@ static int winLock(sqlite3_file *id, int locktype){
       ** copy this retry logic.  It is a hack intended for Windows only.
       */
       OSTRACE(("could not get a PENDING lock. cnt=%d\n", cnt));
-      if( cnt ) portableSleep(1);
+      if( cnt ) sqlite3_win32_sleep(1);
     }
     gotPendingLock = res;
     if( !res ){
@@ -3819,7 +3891,7 @@ static int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf){
 ** Sleep for a little while.  Return the amount of time slept.
 */
 static int winSleep(sqlite3_vfs *pVfs, int microsec){
-  portableSleep((microsec+999)/1000);
+  sqlite3_win32_sleep((microsec+999)/1000);
   UNUSED_PARAMETER(pVfs);
   return ((microsec+999)/1000)*1000;
 }
@@ -3961,12 +4033,7 @@ int sqlite3_os_init(void){
 
   /* Double-check that the aSyscall[] array has been constructed
   ** correctly.  See ticket [bb3a86e890c8e96ab] */
-  assert( ArraySize(aSyscall)==70 );
-
-#if SQLITE_OS_WINRT
-  sleepObj = osCreateEventExW(NULL, NULL, CREATE_EVENT_MANUAL_RESET, 
-                             SYNCHRONIZE);
-#endif
+  assert( ArraySize(aSyscall)==71 );
 
 #ifndef SQLITE_OMIT_WAL
   /* get memory map allocation granularity */
@@ -3985,8 +4052,10 @@ int sqlite3_os_init(void){
 
 int sqlite3_os_end(void){ 
 #if SQLITE_OS_WINRT
-  osCloseHandle(sleepObj);
-  sleepObj = NULL;
+  if( sleepObj != NULL ){
+    osCloseHandle(sleepObj);
+    sleepObj = NULL;
+  }
 #endif
   return SQLITE_OK;
 }