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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:On windows, flush the mapping view when syncing content to disk.
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Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: a828e73dc1ae50189bdf73f60caeb7308738ad7a
User & Date: drh 2015-03-31 19:40:05
Context
2015-04-01
13:21
Improved detection and suppression of endless loops in clearDatabasePage(). check-in: 30011ad2 user: drh tags: trunk
01:26
The build is still broken. Multiple definitions of sqlite3OSTrace when compiled using separate source files. check-in: 5c965a71 user: drh tags: winTest
2015-03-31
19:40
On windows, flush the mapping view when syncing content to disk. check-in: a828e73d user: drh tags: trunk
18:05
Add the "mptest" target to main.mk. Change TRUNCATE and PERSIST to DELETE for mptest.c on Windows because of problems trying to delete the journal. check-in: ea697e6d user: drh tags: trunk
2015-03-27
18:22
Merge updates from trunk. Closed-Leaf check-in: 45acf6a8 user: mistachkin tags: winViewFlush
Changes
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Changes to src/os_win.c.

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        DWORD, DWORD, DWORD, LPCWSTR);
#endif /* defined(SQLITE_WIN32_HAS_WIDE) */

WINBASEAPI LPVOID WINAPI MapViewOfFile(HANDLE, DWORD, DWORD, DWORD, SIZE_T);
#endif /* SQLITE_OS_WINRT */

/*
** This file mapping API is common to both Win32 and WinRT.
*/


WINBASEAPI BOOL WINAPI UnmapViewOfFile(LPCVOID);
#endif /* SQLITE_WIN32_FILEMAPPING_API */

/*
** Some Microsoft compilers lack this definition.
*/
#ifndef INVALID_FILE_ATTRIBUTES
................................................................................
#else
  { "UuidCreateSequential",     (SYSCALL)0,                      0 },
#endif

#define osUuidCreateSequential \
        ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[78].pCurrent)










}; /* End of the overrideable system calls */

/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "win32" VFSes.  Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
................................................................................
  ** no-op
  */
#ifdef SQLITE_NO_SYNC
  OSTRACE(("SYNC-NOP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
           osGetCurrentProcessId(), pFile, pFile->h));
  return SQLITE_OK;
#else
















  rc = osFlushFileBuffers(pFile->h);
  SimulateIOError( rc=FALSE );
  if( rc ){
    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
             osGetCurrentProcessId(), pFile, pFile->h));
    return SQLITE_OK;
  }else{
    pFile->lastErrno = osGetLastError();
    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_FSYNC\n",
             osGetCurrentProcessId(), pFile, pFile->h));
    return winLogError(SQLITE_IOERR_FSYNC, pFile->lastErrno,
                       "winSync", pFile->zPath);
  }
#endif
}

/*
** Determine the current size of a file in bytes
*/
................................................................................
    winGetSystemCall,    /* xGetSystemCall */
    winNextSystemCall,   /* xNextSystemCall */
  };
#endif

  /* Double-check that the aSyscall[] array has been constructed
  ** correctly.  See ticket [bb3a86e890c8e96ab] */
  assert( ArraySize(aSyscall)==79 );

  /* get memory map allocation granularity */
  memset(&winSysInfo, 0, sizeof(SYSTEM_INFO));
#if SQLITE_OS_WINRT
  osGetNativeSystemInfo(&winSysInfo);
#else
  osGetSystemInfo(&winSysInfo);







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        DWORD, DWORD, DWORD, LPCWSTR);
#endif /* defined(SQLITE_WIN32_HAS_WIDE) */

WINBASEAPI LPVOID WINAPI MapViewOfFile(HANDLE, DWORD, DWORD, DWORD, SIZE_T);
#endif /* SQLITE_OS_WINRT */

/*
** These file mapping APIs are common to both Win32 and WinRT.
*/

WINBASEAPI BOOL WINAPI FlushViewOfFile(LPCVOID, SIZE_T);
WINBASEAPI BOOL WINAPI UnmapViewOfFile(LPCVOID);
#endif /* SQLITE_WIN32_FILEMAPPING_API */

/*
** Some Microsoft compilers lack this definition.
*/
#ifndef INVALID_FILE_ATTRIBUTES
................................................................................
#else
  { "UuidCreateSequential",     (SYSCALL)0,                      0 },
#endif

#define osUuidCreateSequential \
        ((RPC_STATUS(RPC_ENTRY*)(UUID*))aSyscall[78].pCurrent)

#if !defined(SQLITE_NO_SYNC) && SQLITE_MAX_MMAP_SIZE>0
  { "FlushViewOfFile",          (SYSCALL)FlushViewOfFile,        0 },
#else
  { "FlushViewOfFile",          (SYSCALL)0,                      0 },
#endif

#define osFlushViewOfFile \
        ((BOOL(WINAPI*)(LPCVOID,SIZE_T))aSyscall[79].pCurrent)

}; /* End of the overrideable system calls */

/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "win32" VFSes.  Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
................................................................................
  ** no-op
  */
#ifdef SQLITE_NO_SYNC
  OSTRACE(("SYNC-NOP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
           osGetCurrentProcessId(), pFile, pFile->h));
  return SQLITE_OK;
#else
#if SQLITE_MAX_MMAP_SIZE>0
  if( pFile->pMapRegion ){
    if( osFlushViewOfFile(pFile->pMapRegion, 0) ){
      OSTRACE(("SYNC-MMAP pid=%lu, pFile=%p, pMapRegion=%p, "
               "rc=SQLITE_OK\n", osGetCurrentProcessId(),
               pFile, pFile->pMapRegion));
    }else{
      pFile->lastErrno = osGetLastError();
      OSTRACE(("SYNC-MMAP pid=%lu, pFile=%p, pMapRegion=%p, "
               "rc=SQLITE_IOERR_MMAP\n", osGetCurrentProcessId(),
               pFile, pFile->pMapRegion));
      return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno,
                         "winSync1", pFile->zPath);
    }
  }
#endif
  rc = osFlushFileBuffers(pFile->h);
  SimulateIOError( rc=FALSE );
  if( rc ){
    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
             osGetCurrentProcessId(), pFile, pFile->h));
    return SQLITE_OK;
  }else{
    pFile->lastErrno = osGetLastError();
    OSTRACE(("SYNC pid=%lu, pFile=%p, file=%p, rc=SQLITE_IOERR_FSYNC\n",
             osGetCurrentProcessId(), pFile, pFile->h));
    return winLogError(SQLITE_IOERR_FSYNC, pFile->lastErrno,
                       "winSync2", pFile->zPath);
  }
#endif
}

/*
** Determine the current size of a file in bytes
*/
................................................................................
    winGetSystemCall,    /* xGetSystemCall */
    winNextSystemCall,   /* xNextSystemCall */
  };
#endif

  /* Double-check that the aSyscall[] array has been constructed
  ** correctly.  See ticket [bb3a86e890c8e96ab] */
  assert( ArraySize(aSyscall)==80 );

  /* get memory map allocation granularity */
  memset(&winSysInfo, 0, sizeof(SYSTEM_INFO));
#if SQLITE_OS_WINRT
  osGetNativeSystemInfo(&winSysInfo);
#else
  osGetSystemInfo(&winSysInfo);