FH_MODE_BINARY /* Fixed-length records. */
};
+/* Ways to access a file. */
+enum fh_access
+ {
+ FH_ACC_READ, /* Read from it. */
+ FH_ACC_WRITE /* Write to it. */
+ };
+
/* Properties of a file handle. */
struct fh_properties
{
struct file_handle *fh_create_scratch (const char *handle_name);
const struct fh_properties *fh_default_properties (void);
-/* Delete file handle from global list. */
-void fh_free (struct file_handle *);
+/* Reference management. */
+struct file_handle *fh_ref (struct file_handle *);
+void fh_unref (struct file_handle *);
+void fh_unname (struct file_handle *);
/* Finding file handles. */
struct file_handle *fh_from_id (const char *handle_name);
size_t fh_get_tab_width (const struct file_handle *);
/* Properties of FH_REF_SCRATCH file handles. */
-struct scratch_handle *fh_get_scratch_handle (struct file_handle *);
+struct scratch_handle *fh_get_scratch_handle (const struct file_handle *);
void fh_set_scratch_handle (struct file_handle *, struct scratch_handle *);
-/* Opening and closing file handles. */
-void **fh_open (struct file_handle *, enum fh_referent mask,
- const char *type, const char *mode);
-int fh_close (struct file_handle *, const char *type, const char *mode);
-bool fh_is_open (const struct file_handle *);
+/* Mutual exclusion for access . */
+struct fh_lock *fh_lock (struct file_handle *, enum fh_referent mask,
+ const char *type, enum fh_access, bool exclusive);
+bool fh_unlock (struct fh_lock *);
+void *fh_lock_get_aux (const struct fh_lock *);
+void fh_lock_set_aux (struct fh_lock *, void *aux);
+bool fh_is_locked (const struct file_handle *, enum fh_access);
/* Default file handle for DATA LIST, REREAD, REPEATING DATA
commands. */