From b7178c22bf642919345095aff9e34e02c00d5762 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Mon, 3 Jun 2019 16:23:01 +0200 Subject: syscalls: Add 'with-file-lock' macro. * guix/scripts/offload.scm (lock-file, unlock-file, with-file-lock): Move to... * guix/build/syscalls.scm: ... here. --- guix/scripts/offload.scm | 25 ------------------------- 1 file changed, 25 deletions(-) (limited to 'guix/scripts/offload.scm') diff --git a/guix/scripts/offload.scm b/guix/scripts/offload.scm index eb02672dbf..0c0dd9d516 100644 --- a/guix/scripts/offload.scm +++ b/guix/scripts/offload.scm @@ -236,30 +236,6 @@ instead of '~a' of type '~a'~%") ;;; Synchronization. ;;; -(define (lock-file file) - "Wait and acquire an exclusive lock on FILE. Return an open port." - (mkdir-p (dirname file)) - (let ((port (open-file file "w0"))) - (fcntl-flock port 'write-lock) - port)) - -(define (unlock-file lock) - "Unlock LOCK." - (fcntl-flock lock 'unlock) - (close-port lock) - #t) - -(define-syntax-rule (with-file-lock file exp ...) - "Wait to acquire a lock on FILE and evaluate EXP in that context." - (let ((port (lock-file file))) - (dynamic-wind - (lambda () - #t) - (lambda () - exp ...) - (lambda () - (unlock-file port))))) - (define (machine-slot-file machine slot) "Return the file name of MACHINE's file for SLOT." ;; For each machine we have a bunch of files representing each build slot. @@ -829,7 +805,6 @@ This tool is meant to be used internally by 'guix-daemon'.\n")) (leave (G_ "invalid arguments: ~{~s ~}~%") x)))) ;;; Local Variables: -;;; eval: (put 'with-file-lock 'scheme-indent-function 1) ;;; eval: (put 'with-error-to-port 'scheme-indent-function 1) ;;; eval: (put 'with-timeout 'scheme-indent-function 2) ;;; End: -- cgit v1.2.3