Function: with-tramp-locked-connection

with-tramp-locked-connection is a macro defined in tramp.el.gz.

Signature

(with-tramp-locked-connection PROC &rest BODY)

Documentation

Lock PROC for other communication, and run BODY.

Mostly useful to protect BODY from being interrupted by timers.

Source Code

;; Defined in /usr/src/emacs/lisp/net/tramp.el.gz
;;; Utility functions:

;; In Emacs, there is some concurrency due to timers.  If a timer
;; interrupts Tramp and wishes to use the same connection buffer as
;; the "main" Emacs, then garbage might occur in the connection
;; buffer.  Therefore, we need to make sure that a timer does not use
;; the same connection buffer as the "main" Emacs.  We lock each
;; connection process separately by a connection property.

(defmacro with-tramp-locked-connection (proc &rest body)
  "Lock PROC for other communication, and run BODY.
Mostly useful to protect BODY from being interrupted by timers."
  (declare (indent 1) (debug t))
  `(if (tramp-get-connection-property ,proc "locked")
       ;; Be kind for old versions of Emacs.
       (if (member 'remote-file-error debug-ignored-errors)
	   (throw 'non-essential 'non-essential)
	 (tramp-error
	  ,proc 'remote-file-error "Forbidden reentrant call of Tramp"))
     (unwind-protect
	 (progn
	   (tramp-set-connection-property ,proc "locked" t)
	   ,@body)
       (tramp-flush-connection-property ,proc "locked"))))