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syscalls: 'with-file-lock' expands to a call to 'call-with-file-lock'.

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* guix/build/syscalls.scm (call-with-file-lock): New procedure.
(with-file-lock): Expand to a call to 'call-with-file-lock'.
This commit is contained in:
Ludovic Courtès 2019-06-03 16:24:31 +02:00
parent b7178c22bf
commit 89ceb86ad4
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1 changed files with 6 additions and 4 deletions
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guix/build/syscalls.scm
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@ -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'.