问题描述
windows 中 msync [unix sys call] 的等价物是什么?我正在 C、C++ 空间中寻找 MSDN api.有关 msync 的更多信息,请访问 http://opengroup.org/onlinepubs/007908799/xsh/msync.html
what is the equivalent of msync [unix sys call] in windows? I am looking for MSDN api in c,C++ space.More info on msync can be found at http://opengroup.org/onlinepubs/007908799/xsh/msync.html
推荐答案
FlushViewOfFile
FlushViewOfFile
查看 Python 2.6 mmapmodule.c 中的 FlushViewOfFile 和 msync 使用示例:
Checkout the Python 2.6 mmapmodule.c for an example of FlushViewOfFile and msync in use:
/*
/ Author: Sam Rushing <[email protected]>
/ Hacked for Unix by AMK
/ $Id: mmapmodule.c 65859 2008-08-19 17:47:13Z thomas.heller $
/ Modified to support mmap with offset - to map a 'window' of a file
/ Author: Yotam Medini [email protected]
/
/ mmapmodule.cpp -- map a view of a file into memory
/
/ todo: need permission flags, perhaps a 'chsize' analog
/ not all functions check range yet!!!
/
/
/ This version of mmapmodule.c has been changed significantly
/ from the original mmapfile.c on which it was based.
/ The original version of mmapfile is maintained by Sam at
/ ftp://squirl.nightmare.com/pub/python/python-ext.
*/
static PyObject *
mmap_flush_method(mmap_object *self, PyObject *args)
{
Py_ssize_t offset = 0;
Py_ssize_t size = self->size;
CHECK_VALID(NULL);
if (!PyArg_ParseTuple(args, "|nn:flush", &offset, &size))
return NULL;
if ((size_t)(offset + size) > self->size) {
PyErr_SetString(PyExc_ValueError, "flush values out of range");
return NULL;
}
#ifdef MS_WINDOWS
return PyInt_FromLong((long) FlushViewOfFile(self->data+offset, size));
#elif defined(UNIX)
/* XXX semantics of return value? */
/* XXX flags for msync? */
if (-1 == msync(self->data + offset, size, MS_SYNC)) {
PyErr_SetFromErrno(mmap_module_error);
return NULL;
}
return PyInt_FromLong(0);
#else
PyErr_SetString(PyExc_ValueError, "flush not supported on this system");
return NULL;
#endif
}
更新:我认为您不会在 win32 映射文件 API 中找到完整的奇偶校验.FlushViewOfFile API 没有同步风格(可能是因为缓存管理器的可能影响).如果需要精确控制何时将数据写入磁盘,也许您可以在创建映射文件的句柄时将 FILE_FLAG_NO_BUFFERING
和 FILE_FLAG_WRITE_THROUGH
标志与 CreateFile API 一起使用?
UPDATE:I don't think you are going to find complete parity in the win32 mapped file APIs. The FlushViewOfFile API doesn't have a synchronous flavor (probably because of the possible impact of the cache manager). If precise control over when data is written to disk is required perhaps you can use the FILE_FLAG_NO_BUFFERING
and FILE_FLAG_WRITE_THROUGH
flags with the CreateFile API when you create the handle to your mapped file?
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