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Overview
| Comment: | Support manually disabling overlapped file I/O for Windows sub-platforms other than Windows CE. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b9330b887cc8bed2b6b3e6c1b269788e |
| User & Date: | mistachkin 2014-12-20 22:21:49 |
Context
|
2014-12-21
| ||
| 11:56 | Fixes to the README.md file. No changes to code. (check-in: ef4b734d user: drh tags: trunk) | |
|
2014-12-20
| ||
| 22:21 | Support manually disabling overlapped file I/O for Windows sub-platforms other than Windows CE. (check-in: b9330b88 user: mistachkin tags: trunk) | |
| 21:14 | Minor fixes and enhancements to the SQLITE_ENABLE_API_ARMOR functionality. (check-in: cb3e4219 user: mistachkin tags: trunk) | |
Changes
Changes to src/os_win.c.
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*/
static int winRead(
sqlite3_file *id, /* File to read from */
void *pBuf, /* Write content into this buffer */
int amt, /* Number of bytes to read */
sqlite3_int64 offset /* Begin reading at this offset */
){
#if !SQLITE_OS_WINCE
OVERLAPPED overlapped; /* The offset for ReadFile. */
#endif
winFile *pFile = (winFile*)id; /* file handle */
DWORD nRead; /* Number of bytes actually read from file */
int nRetry = 0; /* Number of retrys */
assert( id!=0 );
................................................................................
pBuf = &((u8 *)pBuf)[nCopy];
amt -= nCopy;
offset += nCopy;
}
}
#endif
#if SQLITE_OS_WINCE
if( winSeekFile(pFile, offset) ){
OSTRACE(("READ file=%p, rc=SQLITE_FULL\n", pFile->h));
return SQLITE_FULL;
}
while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
#else
memset(&overlapped, 0, sizeof(OVERLAPPED));
................................................................................
pBuf = &((u8 *)pBuf)[nCopy];
amt -= nCopy;
offset += nCopy;
}
}
#endif
#if SQLITE_OS_WINCE
rc = winSeekFile(pFile, offset);
if( rc==0 ){
#else
{
#endif
#if !SQLITE_OS_WINCE
OVERLAPPED overlapped; /* The offset for WriteFile. */
#endif
u8 *aRem = (u8 *)pBuf; /* Data yet to be written */
int nRem = amt; /* Number of bytes yet to be written */
DWORD nWrite; /* Bytes written by each WriteFile() call */
DWORD lastErrno = NO_ERROR; /* Value returned by GetLastError() */
#if !SQLITE_OS_WINCE
memset(&overlapped, 0, sizeof(OVERLAPPED));
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
while( nRem>0 ){
#if SQLITE_OS_WINCE
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
#else
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, &overlapped) ){
#endif
if( winRetryIoerr(&nRetry, &lastErrno) ) continue;
break;
}
assert( nWrite==0 || nWrite<=(DWORD)nRem );
if( nWrite==0 || nWrite>(DWORD)nRem ){
lastErrno = osGetLastError();
break;
}
#if !SQLITE_OS_WINCE
offset += nWrite;
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
aRem += nWrite;
nRem -= nWrite;
}
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*/
static int winRead(
sqlite3_file *id, /* File to read from */
void *pBuf, /* Write content into this buffer */
int amt, /* Number of bytes to read */
sqlite3_int64 offset /* Begin reading at this offset */
){
#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
OVERLAPPED overlapped; /* The offset for ReadFile. */
#endif
winFile *pFile = (winFile*)id; /* file handle */
DWORD nRead; /* Number of bytes actually read from file */
int nRetry = 0; /* Number of retrys */
assert( id!=0 );
................................................................................
pBuf = &((u8 *)pBuf)[nCopy];
amt -= nCopy;
offset += nCopy;
}
}
#endif
#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
if( winSeekFile(pFile, offset) ){
OSTRACE(("READ file=%p, rc=SQLITE_FULL\n", pFile->h));
return SQLITE_FULL;
}
while( !osReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
#else
memset(&overlapped, 0, sizeof(OVERLAPPED));
................................................................................
pBuf = &((u8 *)pBuf)[nCopy];
amt -= nCopy;
offset += nCopy;
}
}
#endif
#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
rc = winSeekFile(pFile, offset);
if( rc==0 ){
#else
{
#endif
#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
OVERLAPPED overlapped; /* The offset for WriteFile. */
#endif
u8 *aRem = (u8 *)pBuf; /* Data yet to be written */
int nRem = amt; /* Number of bytes yet to be written */
DWORD nWrite; /* Bytes written by each WriteFile() call */
DWORD lastErrno = NO_ERROR; /* Value returned by GetLastError() */
#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
memset(&overlapped, 0, sizeof(OVERLAPPED));
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
while( nRem>0 ){
#if SQLITE_OS_WINCE || defined(SQLITE_WIN32_NO_OVERLAPPED)
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
#else
if( !osWriteFile(pFile->h, aRem, nRem, &nWrite, &overlapped) ){
#endif
if( winRetryIoerr(&nRetry, &lastErrno) ) continue;
break;
}
assert( nWrite==0 || nWrite<=(DWORD)nRem );
if( nWrite==0 || nWrite>(DWORD)nRem ){
lastErrno = osGetLastError();
break;
}
#if !SQLITE_OS_WINCE && !defined(SQLITE_WIN32_NO_OVERLAPPED)
offset += nWrite;
overlapped.Offset = (LONG)(offset & 0xffffffff);
overlapped.OffsetHigh = (LONG)((offset>>32) & 0x7fffffff);
#endif
aRem += nWrite;
nRem -= nWrite;
}
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