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with-cache: shared reads #28

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with-cache: shared reads #28

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9 changes: 4 additions & 5 deletions private/with-cache.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -163,24 +163,23 @@
#f)))

(define (call-with-atomic-input-file filename success-proc)
(call/atomic filename (λ () (call-with-input-file filename success-proc))))
(call/atomic filename 'shared (λ () (call-with-input-file filename success-proc))))

(define (call-with-atomic-output-file filename success-proc)
(call/atomic filename (λ () (call-with-output-file filename success-proc #:exists 'replace))))
(call/atomic filename 'exclusive (λ () (call-with-output-file filename success-proc #:exists 'replace))))

(define (call/atomic filename success-thunk)
(define (call/atomic filename kind success-thunk)
(define lockfile (make-lock-file-name
(build-path (find-system-path 'temp-dir)
(format "with-cache~a" (equal-hash-code filename)))))
(call-with-file-lock/timeout filename
'exclusive
kind
success-thunk
(λ ()
(raise (exn:fail:filesystem
(format "with-cache: Failed to lock file '~a', delete the lock '~a' and try again." filename lockfile)
(current-continuation-marks))))
#:lock-file lockfile))

(define (parent-directory-exists? ps)
(and (path-string? ps)
(let ([dir (path-only ps)])
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