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sync: accept 0 arguments

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As suggested by Jonathan Schuster.

Note that the `choice-evt` constructor already accepted 0 arguments.
This commit is contained in:
Matthew Flatt 2014-07-18 13:03:07 +01:00
parent 3cab3f1000
commit df5bfe19c0
3 changed files with 28 additions and 10 deletions
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16
pkgs/racket-pkgs/racket-doc/scribblings/reference/evts.scrbl
View File

@ -51,7 +51,7 @@ Returns @racket[#t] if @racket[v] is a @tech{synchronizable event},
]}
@defproc[(sync [evt evt?] ...+) any]{
@defproc[(sync [evt evt?] ...) any]{
Blocks as long as none of the @tech{synchronizable events}
@racket[evt]s are ready, as defined above.
@ -67,11 +67,13 @@ random-number generator that controls this choice.
(define ch (make-channel))
(thread (λ () (displayln (sync ch))))
(channel-put ch 'hellooooo)
]}
]
@history[#:changed "6.1.0.3" @elem{Allow 0 arguments instead of 1 or more.}]}
@defproc[(sync/timeout [timeout (or/c #f (and/c real? (not/c negative?)) (-> any))]
[evt evt?] ...+)
[evt evt?] ...)
any]{
Like @racket[sync] if @racket[timeout] is @racket[#f]. If
@ -95,10 +97,12 @@ See also @racket[alarm-evt] for an alternative timeout mechanism.
(sync/timeout
(λ () (displayln "no ready events"))
never-evt)
]}
]
@history[#:changed "6.1.0.3" @elem{Allow 1 argument instead of 2 or more.}]}
@defproc[(sync/enable-break [evt evt?] ...+) any]{
@defproc[(sync/enable-break [evt evt?] ...) any]{
Like @racket[sync], but breaking is enabled (see
@secref["breakhandler"]) while waiting on the @racket[evt]s. If
@ -108,7 +112,7 @@ exception is raised, but not both.}
@defproc[(sync/timeout/enable-break [timeout (or/c #f (and/c real? (not/c negative?)) (-> any))]
[evt evt?] ...+)
[evt evt?] ...)
any]{
Like @racket[sync/enable-break], but with a timeout as for @racket[sync/timeout].}

14
pkgs/racket-pkgs/racket-test/tests/racket/sync.rktl
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@ -1373,4 +1373,18 @@
;; ----------------------------------------
;; zero-argument case:
(test #f sync/timeout 0)
(test #f sync
(handle-evt (system-idle-evt)
(lambda (_) #f))
(thread (lambda () (sync))))
(let ([t (thread (lambda () (with-handlers ([exn:break? void]) (sync))))])
(sync (system-idle-evt))
(break-thread t)
(test t sync t))
;; ----------------------------------------
(report-errs)

8
racket/src/racket/src/thread.c
View File

@ -604,10 +604,10 @@ void scheme_init_thread(Scheme_Env *env)
GLOBAL_FOLDING_PRIM("evt?" , evt_p , 1, 1 , 1, env);
GLOBAL_PRIM_W_ARITY2("sync" , sch_sync , 1, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/timeout" , sch_sync_timeout , 2, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/enable-break" , sch_sync_enable_break , 1, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/timeout/enable-break", sch_sync_timeout_enable_break, 2, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync" , sch_sync , 0, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/timeout" , sch_sync_timeout , 1, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/enable-break" , sch_sync_enable_break , 0, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY2("sync/timeout/enable-break", sch_sync_timeout_enable_break, 1, -1, 0, -1, env);
GLOBAL_PRIM_W_ARITY("choice-evt" , evts_to_evt , 0, -1, env);
GLOBAL_PARAMETER("current-thread-initial-stack-size", current_thread_initial_stack_size, MZCONFIG_THREAD_INIT_STACK_SIZE, env);