diff options
author | Hugo Hörnquist <hugo@lysator.liu.se> | 2022-03-08 03:43:03 +0100 |
---|---|---|
committer | Hugo Hörnquist <hugo@lysator.liu.se> | 2022-03-15 01:43:12 +0100 |
commit | 02aba668c408a473067bc26b8f36077384b9c14a (patch) | |
tree | dfd8b1de9002a97bd3410d3ab3389100b8e2ff4a /doc/ref/guile | |
parent | Popup created events now don't take seconds. (diff) | |
download | calp-02aba668c408a473067bc26b8f36077384b9c14a.tar.gz calp-02aba668c408a473067bc26b8f36077384b9c14a.tar.xz |
Add native UUID generator.
While not necessary, since we barely use UUID:s, it's still WAY faster,
and nice to not depend on the system providing `uuidgen'.
For comparison, number of UUID:s generated by different settups in 1
second:
65.000 :: guile native
700 :: guile shell-out
3.500.000 :: c native
100.000 :: libuuid - guile bindings
650.000 :: libuuid
Tests where run with either
(call-with-time-limit
1
(lambda ()
(let loop ()
(uuid)
(set! count (1+ count))
(loop)))
(lambda _ (display count)))
or
volatile unsigned long long count = 0;
sigaction(SIGALARM, ...);
alarm(1);
for (;;) {
uuid();
count++;
}
(let ((count 0))
(call-with-time-limit
1
(lambda ()
(let loop ()
((@ (hnh util) uuidgen))
(set! count (1+ count))
(loop)))
(lambda _ (format #t "exec count = ~:d~%" count))))
Diffstat (limited to 'doc/ref/guile')
-rw-r--r-- | doc/ref/guile/util.texi | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/doc/ref/guile/util.texi b/doc/ref/guile/util.texi index 71e3f93a..2cf1070b 100644 --- a/doc/ref/guile/util.texi +++ b/doc/ref/guile/util.texi @@ -338,7 +338,14 @@ Similar to @var{let}, but sets environment variables for the code in body. Restores the old values once we leave. @end defmac +@subsection UUID generation -@defun uuidgen -Generates a UUID. +Provided by module @code{(hnh util uuid)}. + +@defun uuid-v4 +Generates a UUID-v4 string. +@end defun + +@defun uuid +Generates an implementation defined (but guaranteed valid) UUID. @end defun |