Function BufFileCreateShared

src/backend/storage/file/buffile.c:360–381

* Create a BufFile that can be discovered and opened read-only by other * backends that are attached to the same SharedFileSet using the same name. * * The naming scheme for shared BufFiles is left up to the calling code. The * name will appear as part of one or more filenames on disk, and might * provide clues to administrators about which subsystem is generating * temporary file data. Si

 * unrelated SharedFileSet objects.
 */
BufFile *
BufFileCreateShared(SharedFileSet *fileset, const char *name, workfile_set *work_set)
{
	BufFile    *file;

	file = makeBufFileCommon(1);
	file->fileset = fileset;
	file->name = pstrdup(name);
	file->files = (File *) palloc(sizeof(File));
	file->files[0] = MakeNewSharedSegment(file, 0);
	file->readOnly = false;
	/*
	 * Register the file as a "work file", so that the Cloudberry workfile
	 * limits apply to it.
	 */
	file->work_set = work_set;

	FileSetIsWorkfile(file->files[0]);
	RegisterFileWithSet(file->files[0], work_set);

	return file;
}

/*
 * Open a file that was previously created in another backend (or this one)