/*
* Create a BufFile for a new temporary file (which will expand to become
* multiple temporary files if more than MAX_PHYSICAL_FILESIZE bytes are
* written to it).
*
* If interXact is true, the temp file will not be automatically deleted
* at end of transaction.
*
* Note: if interXact is true, the caller had better be calling us in a
* memory context that will survive across transaction boundaries.
*/
BufFile *
BufFileCreateTemp(bool interXact)
{
BufFile *file;
File pfile;
pfile = OpenTemporaryFile(interXact);
Assert(pfile >= 0);
file = makeBufFile(pfile);
file->isTemp = true;
file->isInterXact = interXact;
/*
* add by cywang
*
* to record the time of read data from disk
*/
file->instr_fileload = InstrAlloc(1,1);
file->fileLoadNum = 0;
file->instr_filedump = InstrAlloc(1,1);
file->fileDumpNum = 0;
return file;
}
/*
* Opens an existing file as BufFile
*
* If create is true, the file is created if it doesn't exist.
*
* Does not add the pgsql_tmp/ prefix to the file path before opening.
*
*/
BufFile *
BufFileOpenFile(const char *fileName, bool create, bool delOnClose, bool interXact)
{
bool closeAtEOXact = !interXact;
File pfile = OpenNamedFile(fileName,
create,
delOnClose,
closeAtEOXact); /* closeAtEOXact */
/*
* If we are trying to open an existing file and it failed,
* signal this to the caller.
*/
if (!create && pfile <= 0)
{
return NULL;
}
Assert(pfile >= 0);
BufFile *file = makeBufFile(pfile);
file->isTemp = delOnClose;
if (!create)
{
/* Open existing file, initialize its size */
file->maxoffset = FileDiskSize(file->file);
}
return file;
}
/*
* Create a BufFile for a new temporary file (which will expand to become
* multiple temporary files if more than MAX_PHYSICAL_FILESIZE bytes are
* written to it).
*
* If interXact is true, the temp file will not be automatically deleted
* at end of transaction.
*
* Note: if interXact is true, the caller had better be calling us in a
* memory context, and with a resource owner, that will survive across
* transaction boundaries.
*/
BufFile *
BufFileCreateTemp(bool interXact)
{
BufFile *file;
File pfile;
pfile = OpenTemporaryFile(interXact);
Assert(pfile >= 0);
file = makeBufFile(pfile);
file->isInterXact = interXact;
return file;
}
/*
* Create a BufFile for a new temporary file.
*
* Adds the pgsql_tmp/ prefix to the file path before creating.
*
* Note: if interXact is true, the caller had better be calling us in a
* memory context that will survive across transaction boundaries.
*/
BufFile *
BufFileCreateTemp(const char *filePrefix, bool interXact)
{
BufFile *file;
File pfile;
bool closeAtEOXact = !interXact;
pfile = OpenTemporaryFile(filePrefix,
true, /* makenameunique */
true, /* create */
true, /* delOnClose */
closeAtEOXact); /* closeAtEOXact */
Assert(pfile >= 0);
file = makeBufFile(pfile);
file->isTemp = true;
return file;
}
/*
* Create a BufFile for a new temporary file used for writer-reader exchange.
*
* Adds the pgsql_tmp/ prefix to the file path before creating.
*
*/
BufFile *
BufFileCreateTemp_ReaderWriter(const char *filePrefix, bool isWriter,
bool interXact)
{
bool closeAtEOXact = !interXact;
File pfile = OpenTemporaryFile(filePrefix,
false, /* makenameunique */
isWriter, /* create */
isWriter, /* delOnClose */
closeAtEOXact); /* closeAtEOXact */
if (pfile < 0)
{
elog(ERROR, "could not open temporary file \"%s\": %m", filePrefix);
}
BufFile *file = makeBufFile(pfile);
file->isTemp = true;
return file;
}
/*
* Create a BufFile and attach it to an already-opened virtual File.
*
* This is comparable to fdopen() in stdio. This is the only way at present
* to attach a BufFile to a non-temporary file. Note that BufFiles created
* in this way CANNOT be expanded into multiple files.
*/
BufFile *
BufFileCreate(File file)
{
return makeBufFile(file);
}