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authorLudovic Courtès <ludo@gnu.org>2019-06-03 16:24:31 +0200
committerLudovic Courtès <ludo@gnu.org>2019-06-05 23:10:36 +0200
commit89ceb86ad415ea92450ebda60359a7ee0ec79eb6 (patch)
treeb0ca73a8f3703f37318d5e2e175b11b0ed770874
parentb7178c22bf642919345095aff9e34e02c00d5762 (diff)
syscalls: 'with-file-lock' expands to a call to 'call-with-file-lock'.
* guix/build/syscalls.scm (call-with-file-lock): New procedure. (with-file-lock): Expand to a call to 'call-with-file-lock'.
-rw-r--r--guix/build/syscalls.scm10
1 files changed, 6 insertions, 4 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 04fbebb8a2..3af41f2cf5 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -1083,17 +1083,19 @@ exception if it's already taken."
(close-port port)
#t)
-(define-syntax-rule (with-file-lock file exp ...)
- "Wait to acquire a lock on FILE and evaluate EXP in that context."
+(define (call-with-file-lock file thunk)
(let ((port (lock-file file)))
(dynamic-wind
(lambda ()
#t)
- (lambda ()
- exp ...)
+ thunk
(lambda ()
(unlock-file port)))))
+(define-syntax-rule (with-file-lock file exp ...)
+ "Wait to acquire a lock on FILE and evaluate EXP in that context."
+ (call-with-file-lock file (lambda () exp ...)))
+
;;;
;;; Miscellaneous, aka. 'prctl'.