# define OS_WINCE 0
#endif
+/*
+** WinCE lacks native support for file locking so we have to fake it
+** with some code of our own.
+*/
+#if OS_WINCE
+typedef struct winceLock {
+ int nReaders; /* Number of reader locks obtained */
+ BOOL bPending; /* Indicates a pending lock has been obtained */
+ BOOL bReserved; /* Indicates a reserved lock has been obtained */
+ BOOL bExclusive; /* Indicates an exclusive lock has been obtained */
+} winceLock;
+#endif
+
/*
** The winFile structure is a subclass of OsFile specific to the win32
** portability layer.
unsigned char locktype; /* Type of lock currently held on this file */
short sharedLockByte; /* Randomly chosen byte used as a shared lock */
#if OS_WINCE
- WCHAR *zDeleteOnClose; /* Name of file to delete when closing */
+ WCHAR *zDeleteOnClose; /* Name of file to delete when closing */
+ HANDLE hMutex; /* Mutex used to control access to shared lock */
+ HANDLE hShared; /* Shared memory segment used for locking */
+ winceLock local; /* Locks obtained by this instance of winFile */
+ winceLock *shared; /* Global shared lock memory for the file */
#endif
};
}
#endif /* OS_WINCE */
-#if OS_WINCE
-/*
-** WindowsCE does not have a localtime() function. So create a
-** substitute.
-*/
-#include <time.h>
-struct tm *__cdecl localtime(const time_t *t)
-{
- static struct tm y;
- FILETIME uTm, lTm;
- SYSTEMTIME pTm;
- i64 t64;
- t64 = *t;
- t64 = (t64 + 11644473600)*10000000;
- uTm.dwLowDateTime = t64 & 0xFFFFFFFF;
- uTm.dwHighDateTime= t64 >> 32;
- FileTimeToLocalFileTime(&uTm,&lTm);
- FileTimeToSystemTime(&lTm,&pTm);
- y.tm_year = pTm.wYear - 1900;
- y.tm_mon = pTm.wMonth - 1;
- y.tm_wday = pTm.wDayOfWeek;
- y.tm_mday = pTm.wDay;
- y.tm_hour = pTm.wHour;
- y.tm_min = pTm.wMinute;
- y.tm_sec = pTm.wSecond;
- return &y;
-}
-#endif
-
-/*
-** Compile with -DSQLITE_OMIT_WIN_LOCKS to disable file locking on
-** windows. If you do this and two or more connections attempt to
-** write the database at the same time, the database file will be
-** corrupted. But some versions of WindowsCE do not support locking,
-** in which case compiling with this option is required just to get
-** it to work at all.
-*/
-#ifdef SQLITE_OMIT_WIN_LOCKS
-# define LockFile(a,b,c,d,e) (1)
-# define LockFileEx(a,b,c,d,e,f) (1)
-# define UnlockFile(a,b,c,d,e) (1)
-# define UnlockFileEx(a,b,c,d,e) (1)
-#endif
-
/*
** Convert a UTF-8 string to UTF-32. Space to hold the returned string
** is obtained from sqliteMalloc.
return zFilename;
}
+#if OS_WINCE
+/*************************************************************************
+** This section contains code for WinCE only.
+*/
+/*
+** WindowsCE does not have a localtime() function. So create a
+** substitute.
+*/
+#include <time.h>
+struct tm *__cdecl localtime(const time_t *t)
+{
+ static struct tm y;
+ FILETIME uTm, lTm;
+ SYSTEMTIME pTm;
+ i64 t64;
+ t64 = *t;
+ t64 = (t64 + 11644473600)*10000000;
+ uTm.dwLowDateTime = t64 & 0xFFFFFFFF;
+ uTm.dwHighDateTime= t64 >> 32;
+ FileTimeToLocalFileTime(&uTm,&lTm);
+ FileTimeToSystemTime(&lTm,&pTm);
+ y.tm_year = pTm.wYear - 1900;
+ y.tm_mon = pTm.wMonth - 1;
+ y.tm_wday = pTm.wDayOfWeek;
+ y.tm_mday = pTm.wDay;
+ y.tm_hour = pTm.wHour;
+ y.tm_min = pTm.wMinute;
+ y.tm_sec = pTm.wSecond;
+ return &y;
+}
+
+/* This will never be called, but defined to make the code compile */
+#define GetTempPathA(a,b)
+
+#define LockFile(a,b,c,d,e) winceLockFile(&a, b, c, d, e)
+#define UnlockFile(a,b,c,d,e) winceUnlockFile(&a, b, c, d, e)
+#define LockFileEx(a,b,c,d,e,f) winceLockFileEx(&a, b, c, d, e, f)
+
+#define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-offsetof(winFile,h)]
+
+/*
+** Acquire a lock on the handle h
+*/
+static void winceMutexAcquire(HANDLE h){
+ DWORD dwErr;
+ do {
+ dwErr = WaitForSingleObject(h, INFINITE);
+ } while (dwErr != WAIT_OBJECT_0 && dwErr != WAIT_ABANDONED);
+}
+/*
+** Release a lock acquired by winceMutexAcquire()
+*/
+#define winceMutexRelease(h) ReleaseMutex(h)
+
+/*
+** Create the mutex and shared memory used for locking in the file
+** descriptor pFile
+*/
+static BOOL winceCreateLock(const char *zFilename, winFile *pFile){
+ WCHAR *zTok;
+ WCHAR *zName = utf8ToUnicode(zFilename);
+ BOOL bInit = TRUE;
+
+ /* Initialize the local lockdata */
+ ZeroMemory(&pFile->local, sizeof(pFile->local));
+
+ /* Replace the backslashes from the filename and lowercase it
+ ** to derive a mutex name. */
+ zTok = CharLowerW(zName);
+ for (;*zTok;zTok++){
+ if (*zTok == '\\') *zTok = '_';
+ }
+
+ /* Create/open the named mutex */
+ pFile->hMutex = CreateMutexW(NULL, FALSE, zName);
+ if (!pFile->hMutex){
+ sqliteFree(zName);
+ return FALSE;
+ }
+
+ /* Acquire the mutex before continuing */
+ winceMutexAcquire(pFile->hMutex);
+
+ /* Since the names of named mutexes, semaphores, file mappings etc are
+ ** case-sensitive, take advantage of that by uppercasing the mutex name
+ ** and using that as the shared filemapping name.
+ */
+ CharUpperW(zName);
+ pFile->hShared = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
+ PAGE_READWRITE, 0, sizeof(winceLock),
+ zName);
+
+ /* Set a flag that indicates we're the first to create the memory so it
+ ** must be zero-initialized */
+ if (GetLastError() == ERROR_ALREADY_EXISTS){
+ bInit = FALSE;
+ }
+
+ sqliteFree(zName);
+
+ /* If we succeeded in making the shared memory handle, map it. */
+ if (pFile->hShared){
+ pFile->shared = (winceLock*)MapViewOfFile(pFile->hShared,
+ FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, sizeof(winceLock));
+ /* If mapping failed, close the shared memory handle and erase it */
+ if (!pFile->shared){
+ CloseHandle(pFile->hShared);
+ pFile->hShared = NULL;
+ }
+ }
+
+ /* If shared memory could not be created, then close the mutex and fail */
+ if (pFile->hShared == NULL){
+ winceMutexRelease(pFile->hMutex);
+ CloseHandle(pFile->hMutex);
+ pFile->hMutex = NULL;
+ return FALSE;
+ }
+
+ /* Initialize the shared memory if we're supposed to */
+ if (bInit) {
+ ZeroMemory(pFile->shared, sizeof(winceLock));
+ }
+
+ winceMutexRelease(pFile->hMutex);
+ return TRUE;
+}
+
+/*
+** Destroy the part of winFile that deals with wince locks
+*/
+static void winceDestroyLock(winFile *pFile){
+ if (pFile->hMutex){
+ /* Acquire the mutex */
+ winceMutexAcquire(pFile->hMutex);
+
+ /* The following blocks should probably assert in debug mode, but they
+ are to cleanup in case any locks remained open */
+ if (pFile->local.nReaders){
+ pFile->shared->nReaders --;
+ }
+ if (pFile->local.bReserved){
+ pFile->shared->bReserved = FALSE;
+ }
+ if (pFile->local.bPending){
+ pFile->shared->bPending = FALSE;
+ }
+ if (pFile->local.bExclusive){
+ pFile->shared->bExclusive = FALSE;
+ }
+
+ /* De-reference and close our copy of the shared memory handle */
+ UnmapViewOfFile(pFile->shared);
+ CloseHandle(pFile->hShared);
+
+ /* Done with the mutex */
+ winceMutexRelease(pFile->hMutex);
+ CloseHandle(pFile->hMutex);
+ pFile->hMutex = NULL;
+ }
+}
+
+/*
+** An implementation of the LockFile() API of windows for wince
+*/
+static BOOL winceLockFile(
+ HANDLE *phFile,
+ DWORD dwFileOffsetLow,
+ DWORD dwFileOffsetHigh,
+ DWORD nNumberOfBytesToLockLow,
+ DWORD nNumberOfBytesToLockHigh
+){
+ winFile *pFile = HANDLE_TO_WINFILE(phFile);
+ BOOL bReturn = FALSE;
+
+ if (!pFile->hMutex) return TRUE;
+ winceMutexAcquire(pFile->hMutex);
+
+ /* Wanting an exclusive lock? */
+ if (dwFileOffsetLow == SHARED_FIRST
+ && nNumberOfBytesToLockLow == SHARED_SIZE){
+ if (pFile->shared->nReaders == 0 && pFile->shared->bExclusive == 0){
+ pFile->shared->bExclusive = TRUE;
+ pFile->local.bExclusive = TRUE;
+ bReturn = TRUE;
+ }
+ }
+
+ /* Want a read-only lock? */
+ else if ((dwFileOffsetLow >= SHARED_FIRST &&
+ dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE) &&
+ nNumberOfBytesToLockLow == 1){
+ if (pFile->shared->bExclusive == 0){
+ pFile->local.nReaders ++;
+ if (pFile->local.nReaders == 1){
+ pFile->shared->nReaders ++;
+ }
+ bReturn = TRUE;
+ }
+ }
+
+ /* Want a pending lock? */
+ else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToLockLow == 1){
+ /* If no pending lock has been acquired, then acquire it */
+ if (pFile->shared->bPending == 0) {
+ pFile->shared->bPending = TRUE;
+ pFile->local.bPending = TRUE;
+ bReturn = TRUE;
+ }
+ }
+ /* Want a reserved lock? */
+ else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToLockLow == 1){
+ if (pFile->shared->bReserved == 0) {
+ pFile->shared->bReserved = TRUE;
+ pFile->local.bReserved = TRUE;
+ bReturn = TRUE;
+ }
+ }
+
+ winceMutexRelease(pFile->hMutex);
+ return bReturn;
+}
+
+/*
+** An implementation of the UnlockFile API of windows for wince
+*/
+static BOOL winceUnlockFile(
+ HANDLE *phFile,
+ DWORD dwFileOffsetLow,
+ DWORD dwFileOffsetHigh,
+ DWORD nNumberOfBytesToUnlockLow,
+ DWORD nNumberOfBytesToUnlockHigh
+){
+ winFile *pFile = HANDLE_TO_WINFILE(phFile);
+ BOOL bReturn = FALSE;
+
+ if (!pFile->hMutex) return TRUE;
+ winceMutexAcquire(pFile->hMutex);
+
+ /* Releasing a reader lock or an exclusive lock */
+ if (dwFileOffsetLow >= SHARED_FIRST &&
+ dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE){
+ /* Did we have an exclusive lock? */
+ if (pFile->local.bExclusive){
+ pFile->local.bExclusive = FALSE;
+ pFile->shared->bExclusive = FALSE;
+ bReturn = TRUE;
+ }
+
+ /* Did we just have a reader lock? */
+ else if (pFile->local.nReaders){
+ pFile->local.nReaders --;
+ if (pFile->local.nReaders == 0)
+ {
+ pFile->shared->nReaders --;
+ }
+ bReturn = TRUE;
+ }
+ }
+
+ /* Releasing a pending lock */
+ else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){
+ if (pFile->local.bPending){
+ pFile->local.bPending = FALSE;
+ pFile->shared->bPending = FALSE;
+ bReturn = TRUE;
+ }
+ }
+ /* Releasing a reserved lock */
+ else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){
+ if (pFile->local.bReserved) {
+ pFile->local.bReserved = FALSE;
+ pFile->shared->bReserved = FALSE;
+ bReturn = TRUE;
+ }
+ }
+
+ winceMutexRelease(pFile->hMutex);
+ return bReturn;
+}
+
+/*
+** An implementation of the LockFileEx() API of windows for wince
+*/
+static BOOL winceLockFileEx(
+ HANDLE *phFile,
+ DWORD dwFlags,
+ DWORD dwReserved,
+ DWORD nNumberOfBytesToLockLow,
+ DWORD nNumberOfBytesToLockHigh,
+ LPOVERLAPPED lpOverlapped
+){
+ /* If the caller wants a shared read lock, forward this call
+ ** to winceLockFile */
+ if (lpOverlapped->Offset == SHARED_FIRST &&
+ dwFlags == 1 &&
+ nNumberOfBytesToLockLow == SHARED_SIZE){
+ return winceLockFile(phFile, SHARED_FIRST, 0, 1, 0);
+ }
+ return FALSE;
+}
+/*
+** End of the special code for wince
+*****************************************************************************/
+#endif /* OS_WINCE */
/*
** Delete the named file
}else{
*pReadonly = 0;
}
+#if OS_WINCE
+ if (!winceCreateLock(zFilename, &f)){
+ CloseHandle(h);
+ sqliteFree(zWide);
+ return SQLITE_CANTOPEN;
+ }
+#endif
sqliteFree(zWide);
}else{
#if OS_WINCE
f.sharedLockByte = 0;
#if OS_WINCE
f.zDeleteOnClose = delFlag ? utf8ToUnicode(zFilename) : 0;
+ f.hMutex = NULL;
#endif
TRACE3("OPEN EX %d \"%s\"\n", h, zFilename);
return allocateWinFile(&f, pId);
f.sharedLockByte = 0;
#if OS_WINCE
f.zDeleteOnClose = 0;
+ f.hMutex = NULL;
#endif
TRACE3("OPEN RO %d \"%s\"\n", h, zFilename);
return allocateWinFile(&f, pId);
TRACE2("CLOSE %d\n", pFile->h);
CloseHandle(pFile->h);
#if OS_WINCE
+ winceDestroyLock(pFile);
if( pFile->zDeleteOnClose ){
DeleteFileW(pFile->zDeleteOnClose);
sqliteFree(pFile->zDeleteOnClose);
projects / thirdparty / sqlite.git / commitdiff
