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ev.chezscheme.sls
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ev.chezscheme.sls
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;; libev bindings for Chez Scheme.
;; Written by Jerry 2019-2023.
;; SPDX-License-Identifier: Unlicense
;; Sections of code delimited by uppercased pure_test_start/pure_test_end markers
;; will be extracted into pure.scm and used for testing the pure scheme implementation.
;; I prefer to keep this code inline instead of split out and included.
(library (ev)
(export
;; enums, bitmaps and IDs.
evmask EV_NONE EV_IO
evflag EVFLAG_AUTO
evbackend
evrun
evbreak
ev-child-trace
;; parameter.
current-loop
;; meta funcs.
ev-version-major ev-version-minor ev-supported-backends ev-recommended-backends ev-embeddable-backends
;; time related.
ev-time ev-sleep
;; loop related.
ev-default-loop ev-loop-new ev-now ev-loop-destroy ev-loop-fork ev-backend ev-now-update ev-run ev-break ev-ref ev-unref
ev-iteration ev-depth ev-verify ev-set-io-collect-interval ev-set-timeout-collect-interval
;; advanced threading.
ev-set-userdata ev-userdata ev-set-invoke-pending-cb ev-set-loop-release-cb
ev-pending-count ev-invoke-pending
;; timer handling.
ev-suspend ev-resume
;; generic event watcher controls.
ev-feed-event ev-feed-fd-event ev-feed-signal ev-feed-signal-event ev-invoke ev-clear-pending
;; Event watchers.
ev-io ev-io-free
(rename
(ev-io-init ev-io-init!)
(ev-io-set ev-io-set!)
(ev-io-fd-get ev-io-fd)
(ev-io-events-get ev-io-events)
(ev-io-modify ev-io-modify!))
ev-io-start ev-io-stop
ev-timer ev-timer-free
(rename
(ev-timer-init ev-timer-init!)
(ev-timer-set ev-timer-set!)
(ev-timer-repeat-get ev-timer-repeat)
(ev-timer-repeat-set ev-timer-repeat-set!))
ev-timer-start ev-timer-stop ev-timer-again ev-timer-remaining
ev-periodic
(rename
(ev-periodic-free* ev-periodic-free)
(ev-periodic-init ev-periodic-init!)
(ev-periodic-set ev-periodic-set!)
(ev-periodic-offset-get ev-periodic-offset)
(ev-periodic-offset-set ev-periodic-offset-set!)
(ev-periodic-interval-get ev-periodic-interval)
(ev-periodic-interval-set ev-periodic-interval-set!)
(ev-periodic-reschedule-cb-get ev-periodic-reschedule-cb)
(ev-periodic-reschedule-cb-set ev-periodic-reschedule-cb-set!))
ev-periodic-start ev-periodic-stop ev-periodic-again ev-periodic-at
ev-signal ev-signal-free
(rename
(ev-signal-init ev-signal-init!)
(ev-signal-set ev-signal-set!)
(ev-signal-signum-get ev-signal-signum))
ev-signal-start ev-signal-stop
ev-child ev-child-free
(rename
(ev-child-init ev-child-init!)
(ev-child-set ev-child-set!)
(ev-child-pid-get ev-child-pid)
(ev-child-rpid-get ev-child-rpid)
(ev-child-rpid-set ev-child-rpid-set!)
(ev-child-rstatus-get ev-child-rstatus)
(ev-child-rstatus-set ev-child-rstatus-set!))
ev-child-start ev-child-stop
ev-stat
(rename
(ev-stat-init ev-stat-init!)
(ev-stat-set ev-stat-set!)
(ev-stat-attr-get ev-stat-attr)
(ev-stat-prev-get ev-stat-prev)
(ev-stat-interval-get ev-stat-interval)
(ev-stat-path-get* ev-stat-path)
(ev-stat-free* ev-stat-free))
ev-stat-start ev-stat-stop ev-stat-stat
ev-idle ev-idle-free
ev-idle-start ev-idle-stop
ev-prepare ev-prepare-free
ev-prepare-start ev-prepare-stop
ev-check ev-check-free
ev-check-start ev-check-stop
ev-embed ev-embed-free
(rename
(ev-embed-init ev-embed-init!)
(ev-embed-other-get ev-embed-other))
ev-embed-start ev-embed-stop ev-embed-sweep
ev-fork ev-fork-free
ev-fork-start ev-fork-stop
ev-cleanup ev-cleanup-free
ev-cleanup-start ev-cleanup-stop
ev-async ev-async-free
(rename
(ev-async-init ev-async-init!)
(ev-async-pending ev-async-pending?))
ev-async-start ev-async-stop ev-async-send
(rename
(ev-is-active ev-active?))
ev-ms
;; Convenience wrappers for the 3 modes of ev-periodic timers.
;; See libev(3).
ev-absolute-timer
ev-interval-timer
ev-manual-timer
)
(import
(chezscheme)
(ev ftypes-util))
;;;; PURE_TEST_START
(meta begin
;; #t: use pure scheme re-implementation of libev C macros.
;; #f: use macro->function wrappers from ev-ffi shared lib.
;; Using the pure version is easier on systems without access to a C compiler and may
;; have benefits when compiling whole programs, however it has higher risk of being
;; out of sync with the installed libev.so shared lib.
(define pure? #t)
;; ev-multiplicity? must be set to the same value as libev's EV_MULTIPLICITY.
;; This is because a number of libev functions will include `struct ev_loop*` as a first
;; parametre only if this is true.
;; These bindings aim to generate the correct function prototypes for either case.
;; #t set the loop affected by changing or overriding the `(current-loop)` parameter.
;; #f (current-loop) is defined and exported but ignored.
(define ev-multiplicity? #t)
)
(define load-libev
(load-shared-object "libev.so.4"))
(c-bitmap evmask
(UNDEF #xFFFFFFFF)
(READ #x01)
(WRITE #x02)
(_IOFDSET #x80)
(TIMER #x00000100)
(PERIODIC #x00000200)
(SIGNAL #x00000400)
(CHILD #x00000800)
(STAT #x00001000)
(IDLE #x00002000)
(PREPARE #x00004000)
(CHECK #x00008000)
(EMBED #x00010000)
(FORK #x00020000)
(CLEANUP #x00040000)
(ASYNC #x00080000)
(CUSTOM #x01000000)
(ERROR #x80000000))
(define EV_NONE #x00)
(define EV_IO (evmask READ))
(c-bitmap evflag
(NOENV #x01000000)
(FORKCHECK #x02000000)
(NOINOTIFY #x00100000)
(SIGNALFD #x00200000)
(NOSIGMASK #x00400000))
(define EVFLAG_AUTO #x00000000)
(c-bitmap evbackend
(MASK #x0000FFFF)
(SELECT #x00000001)
(POLL #x00000002)
(EPOLL #x00000004)
(KQUEUE #x00000008)
(DEVPOLL #x00000010)
(PORT #x00000020)
(ALL #x0000003F))
(c-enum evrun
(NOWAIT 1)
(ONCE 2))
(c-enum evbreak
(CANCEL 0)
(ONE 1)
(ALL 2))
(c-enum ev-child-trace
(TERM 0)
(ANY 1))
(define-ftype ev-loop (struct))
;; tv-tstamp is a 'double' unless EV_TSTAMP_T overrides it.
(define-ftype ev-tstamp double)
(define-ftype const-char unsigned-8)
;; !!! ev_stat embeds two ev-statdata objects which have a number of members and are OS dependant.
;; Add output of `uname -a` (or equivalent) as first comment.
;; (ev info) can be used to help find values for new systems. eg,
;; $ make ffi
;; $ scheme
;; > (import (ev info))
;; > (ev-statdata-sizeof)
(meta-cond
[(eq? (machine-type) 'arm32le)
;; Linux barovia 5.15.72_1 #1 SMP Sun Oct 16 14:46:40 UTC 2022 armv7l GNU/Linux
(define-ftype ev-statdata (array 88 unsigned-8))
;; ev_stat:path ptr has extra padding (aligned to 64bit boundary?) on armv7l.
(define-ftype armv7l-padding (array 4 unsigned-8))]
[(eq? (machine-type) 'ti3le)
;; Linux palanthus.thyme 6.1.31_1 #1 SMP PREEMPT_DYNAMIC Wed May 31 05:53:37 UTC 2023 i686 GNU/Linux
(define-ftype ev-statdata (array 88 unsigned-8))
(define-ftype armv7l-padding (struct))]
[(eq? (machine-type) 'ta6le)
;; Linux lethe.thyme 6.1.31_1 #1 SMP PREEMPT_DYNAMIC Wed May 31 05:53:37 UTC 2023 x86_64 GNU/Linux
(define-ftype ev-statdata (array 144 unsigned-8))
(define-ftype armv7l-padding (struct))]
[else
;; Unknown architecture, the error will manifest as:
;; Exception: unrecognized ftype name ev-statdata at line ...
(begin)])
;; Define all ev watchers (both pure and ffi wrapped) as implicit ftype subtypes of ev-watcher.
;; ie, ev-watcher must be the first field in watcher ftype struct definitions.
;; This allows for common field access without casting pointers.
(define-ftype ev-watcher
(struct
;; EV_WATCHER(type)
;; ev.h defines active and pending as int but are boolean according to the manpage.
(active boolean)
(pending boolean)
;; EV_DECL_PRIORITY
;; NOTE: priority may not be defined if EV_MINPRI == EV_MAXPRI !!!
;; Make sure to modify ev-TYPE-init if this is changed.
(priority int)
;; EV_COMMON
;; EV_COMMON defines `data` by default, update ev-TYPE-init if changed and add accessors.
(data void*)
))
;;;; PURE_TEST_END
;; memory alloc function prototype.
(define-ftype realloc-fn (function (void* long) void*))
(define-ftype msg-cb-fn (function (string) void))
(define-ftype ev-loop-callback (function ((* ev-loop)) void))
(meta-cond
[pure?
;;;; This section contains the pure scheme portion of these bindings.
;;;; It implements:
;;;; - the C watcher structs as ftypes as well as getter/setter functions for its fields
;;;; - struct memory allocators
;;;; - constructors: ie, alloc + init = make
;;;; - specialised watcher type field setters
;;;; - high level watcher context constructors.
;;;;
;;;; ev-TYPE-init functions are *not* (yet?) implemented.
;;;;
;;;; Scheme code that re-implements a C macro should contain a snippet of that code
;;;; prefixed by CREF to show what the scheme should do.
;;;; It may also help spot when/if that scheme code goes stale..
;;;; PURE_TEST_START
(define memset
(foreign-procedure "memset" (void* int size_t) void*))
(define-ftype ev-watcher-list* void*)
;; !!! For Linux, this is currently an int: see <bits/types.h>
(define-ftype sig-atomic-t int)
;; [syntax] define-ev-type define ftype and base functions for an ev type struct.
;; field-acl:
;; - private is readable anytime and not writable by us, ie. internal to libev
;; However, we'll create setters for these as we're implementing our own init funcs.
;; - ro is readable anytime, but only writable when watcher is inactive
;; - rw is readable and writable anytime
;; - unused is ignored, but only generated in the ftype struct for padding
;; - (ref ev-acl) means reference (ftype-&ref) to embedded struct to be returned due to
;; ftype-ref only working on simple/atomic types, not structs
(define-syntax ev-type-builder
(lambda (x)
(syntax-case x ()
[(_ type-name type-name-t ev-TYPE-cb-t (init-args* ...)
(extra-ftypes* ...)
(field-name field-type field-acl) ...)
(with-syntax ([(ev-TYPE-FIELD-get ...)
(map
(lambda (syn access)
(define get-name
(make-id-syntax #'type-name #'type-name "-" syn "-get"))
(cond
[(eq? access 'unused)
#'(begin)]
[(pair? access)
#`(define #,get-name
(lambda (ptr)
(ftype-&ref type-name-t (#,syn) ptr)))]
[else
#`(define #,get-name
(lambda (ptr)
(ftype-ref type-name-t (#,syn) ptr)))]))
#'(field-name ...) (map syntax->datum #'(field-acl ...)))]
[(ev-TYPE-FIELD-set ...)
(map
(lambda (syn type access)
(define setter-funcname (make-id-syntax #'type-name #'type-name "-" syn "-set"))
(cond
[(or (eq? access 'unused) (pair? access))
;; NOTE: setters are never generated for (ref ev-acl), instead get the member
;; reference and use setters on that.
#'(begin)]
[(eq? type 'ev-tstamp)
;; Generate ev-tstamp setters that cast integers to flonums.
#`(define #,setter-funcname
(lambda (ptr val)
(ftype-set! type-name-t (#,syn) ptr (if (flonum? val) val (fixnum->flonum val)))))]
[else
;; Generate setters for both ro and rw fields.
;; ro setters may be used internally, but they won't
;; be exported from this lib. eg, ev-stat-path.
#`(define #,setter-funcname
(lambda (ptr val)
(ftype-set! type-name-t (#,syn) ptr val)))]))
#'(field-name ...)
(map syntax->datum #'(field-type ...))
(map syntax->datum #'(field-acl ...)))]
[allocz-ev-TYPE (make-id-syntax #'type-name "allocz-" #'type-name)]
[ev-TYPE-init (make-id-syntax #'type-name #'type-name "-init")]
[make-ev-TYPE (make-id-syntax #'type-name "make-" #'type-name)]
[ev-TYPE-free (make-id-syntax #'type-name #'type-name "-free")]
[ev-TYPE-cb-get (make-id-syntax #'type-name #'type-name "-cb-get")]
[ev-TYPE-set (make-id-syntax #'type-name #'type-name "-set")]
[ev-TYPE-start (make-id-syntax #'type-name #'type-name "-start")]
[(ev-loop-p ...)
(if ev-multiplicity?
(list #'(* ev-loop))
(list))]
[ev-TYPE-stop (make-id-syntax #'type-name #'type-name "-stop")])
#'(begin
(define-ftype
[type-name-t
(struct
(base ev-watcher)
(field-name field-type)
...)]
[ev-TYPE-cb-t
(function (ev-loop-p ... (* type-name-t) int) void)]
extra-ftypes* ...)
ev-TYPE-FIELD-get ...
ev-TYPE-FIELD-set ...
(define allocz-ev-TYPE
(lambda ()
;; Allocate and zero watcher struct memory.
(let ([mem (foreign-alloc (ftype-sizeof type-name-t))])
(memset mem 0 (ftype-sizeof type-name-t))
(make-ftype-pointer type-name-t mem))))
(define ev-TYPE-init
(lambda (ev-t cb)
;; CREF: do { \
;; ((ev_watcher *)(void *)(ev))->active = \
;; ((ev_watcher *)(void *)(ev))->pending = 0; \
;; ev_set_priority ((ev), 0); \
;; ev_set_cb ((ev), cb_); \
;; } while (0)
(ftype-set! ev-watcher (active) ev-t #f)
(ftype-set! ev-watcher (pending) ev-t #f)
;; EV_DECL_PRIORITY
(ftype-set! ev-watcher (priority) ev-t 0)
(ftype-set! type-name-t (cb) ev-t cb)))
(define make-ev-TYPE
(lambda (init-args* ... cb)
(let ([ptr (allocz-ev-TYPE)])
(ev-TYPE-init ptr cb)
(ev-TYPE-set ptr init-args* ...)
ptr)))
(define ev-TYPE-free
(lambda (watcher)
(ev-TYPE-stop watcher)
;; Unlock the callback function address so that Chez Scheme's gc can remove it.
(unlock-object (foreign-callable-code-object (ftype-pointer-address (ev-TYPE-cb-get watcher))))
(foreign-free (ftype-pointer-address watcher))))
(define type-name
(lambda (init-args* ... cb)
(let ([watcher (make-ev-TYPE
init-args* ...
(make-ftype-pointer
ev-TYPE-cb-t
(meta-cond
[ev-multiplicity?
(lambda (loop w rev)
(parameterize ([current-loop loop])
(cb w rev)))]
[else
cb])))])
;; Note: (locked-object? (foreign-callable-code-object (ftype-pointer-address fp-callback))) => #t
(ev-TYPE-start watcher)
watcher)))))])))
(define-syntax define-ev-type
(lambda (x)
(syntax-case x ()
[(_ type-name init-args extra-ftypes field-def* ...)
(with-syntax ([type-name-t (make-id-syntax #'type-name #'type-name "-t")]
[ev-TYPE-cb-t (make-id-syntax #'type-name #'type-name "-cb-t")])
#'(begin
(ev-type-builder type-name type-name-t ev-TYPE-cb-t init-args extra-ftypes
;; EV_CB_DECLARE(type)
(cb (* ev-TYPE-cb-t) private)
;; type specific field definitions..
field-def*
...)))])))
(define-syntax define-ev-type-list
(syntax-rules ()
[(_ type-name init-args extra-ftypes field-def* ...)
(define-ev-type type-name init-args extra-ftypes
(next ev-watcher-list* private)
field-def*
...)]))
(define-syntax define-ev-type-time
(syntax-rules ()
[(_ type-name init-args extra-ftypes field-def* ...)
(define-ev-type type-name init-args extra-ftypes
(at ev-tstamp private)
field-def*
...)]))
;; I'm not sure if this is more efficient, but generate syntax
;; for a void rather than a function that calls void for no-ops.
(define-syntax nop
(syntax-rules ()
[(_ name arg* ...)
(define-syntax name
(syntax-rules ()
[(_ (... ...))
(void)]))]))
;; Event watcher typedef and fields setter function defines.
;; The field setter function is useful in that it abstracts setting all the user facing event specific
;; fields. ie, combining these with allocz-TYPE + ev-init gives an easy make-TYPE function.
;; These could've been generated except some do custom/non-obvious things. eg, ev-io-set & _IOFDSET.
;; Keep these out of the grand syntax generator for readability and (hopefully) easier maintenance.
;; At least for now...
(define-ev-type-list ev-io (fd events)
()
(fd int ro)
(events int ro))
(define ev-io-set
(lambda (ev-t fd events)
;; CREF: do { (ev)->fd = (fd_); (ev)->events = (events_) | EV__IOFDSET; } while (0)
(ev-io-fd-set ev-t fd)
(ev-io-events-set ev-t (bitwise-ior events (evmask _IOFDSET)))))
(define-ev-type-time ev-timer (after repeat)
()
(repeat ev-tstamp rw))
(define ev-timer-set
(lambda (ev-t after repeat)
;; CREF: do { ((ev_watcher_time *)(ev))->at = (after_); (ev)->repeat = (repeat_); } while (0)
(ev-timer-at-set ev-t after)
(ev-timer-repeat-set ev-t repeat)))
(define-ev-type-time ev-periodic (offset interval reschedule-cb)
([ev-periodic-reschedule-cb-t (function ((* ev-periodic-t) ev-tstamp) ev-tstamp)])
(offset ev-tstamp rw)
(interval ev-tstamp rw)
(reschedule-cb (* ev-periodic-reschedule-cb-t) rw))
(define ev-periodic-set
(lambda (ev-t offset interval reschedule-cb)
;; CREF: do { (ev)->offset = (ofs_); (ev)->interval = (ival_); (ev)->reschedule_cb = (rcb_); } while (0)
(ev-periodic-offset-set ev-t offset)
(ev-periodic-interval-set ev-t interval)
(ev-periodic-reschedule-cb-set ev-t reschedule-cb)))
(define-ev-type-list ev-signal (signum)
()
(signum int ro))
(define ev-signal-set
(lambda (ev-t signum)
;; CREF: do { (ev)->signum = (signum_); } while (0)
(ev-signal-signum-set ev-t signum)))
(define-ev-type-list ev-child (pid trace)
()
(flags int private)
(pid int ro)
(rpid int rw)
(rstatus int rw))
;; `trace` must be a value in (ev-child-trace).
(define ev-child-set
(lambda (ev-t pid trace)
;; CREF: do { (ev)->pid = (pid_); (ev)->flags = !!(trace_); } while (0)
;; !!trace is a C trick to convert the integer value to 0 or 1.
(ev-child-pid-set ev-t pid)
(ev-child-flags-set ev-t trace)))
(define-ev-type-list ev-stat (path interval)
()
(timer ev-timer-t (ref private))
(interval ev-tstamp ro)
(path (* const-char) ro)
(_ armv7l-padding unused)
(prev ev-statdata (ref ro))
(attr ev-statdata (ref ro))
(wd int private) ; acl not specified in header for this field
)
(define ev-stat-set
(lambda (ev-t path interval)
;; CREF: do { (ev)->path = (path_); (ev)->interval = (interval_); (ev)->wd = -2; } while (0)
;; Free original path if configured.
(unless (ftype-pointer-null? (ev-stat-path-get ev-t))
(foreign-free (ftype-pointer-address (ev-stat-path-get ev-t))))
;; Copy path scheme string to foreign memory and assign.
(ev-stat-path-set
ev-t
(string->const-char* path))
(ev-stat-interval-set ev-t interval)
(ev-stat-wd-set ev-t -2)))
(define-ev-type ev-idle () ())
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-idle-set)
(define-ev-type ev-prepare () ())
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-prepare-set)
(define-ev-type ev-check () ())
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-check-set)
(define-ev-type ev-fork () ())
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-fork-set)
(define-ev-type ev-cleanup () ())
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-cleanup-set)
(define-ev-type ev-embed (other)
()
(other (* ev-loop) ro)
(io ev-io-t (ref private))
(prepare ev-prepare-t (ref private))
(check ev-check-t unused)
(timer ev-timer-t unused)
(periodic ev-periodic-t unused)
(idle ev-idle-t unused)
(fork ev-fork-t (ref private))
(cleanup ev-cleanup-t unused))
(define ev-embed-set
(lambda (ev-t other)
;; CREF: do { (ev)->other = (other_); } while (0)
(ev-embed-other-set ev-t other)))
(define-ev-type ev-async ()
()
(sent sig-atomic-t private))
;; CREF: /* nop, yes, this is a serious in-joke */
(nop ev-async-set)
;;;; This section contains pure scheme re-implementations of libev ev.h C-macros.
(define ev-io-modify
(lambda (ev-t events)
;; CREF: do { (ev)->events = (ev)->events & EV__IOFDSET | (events_); } while (0)
;; bitwise & (AND) has higher precedence than bitwise | (OR), so this looks
;; like it disables all existing events except IOFDSET and enables new events.
(ev-io-events-set ev-t (bitwise-ior events (evmask _IOFDSET)))))
(define ev-is-active
(lambda (watcher)
;; CREF: (0 + ((ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */
(ftype-ref ev-watcher (active) watcher)))
(define ev-periodic-at
;; CREF: (+((ev_watcher_time *)(ev))->at)
ev-periodic-at-get)
(define ev-async-pending
(lambda (watcher)
;; CREF: (+(w)->sent)
(> (ev-async-sent-get watcher) 0)))
;;;; PURE_TEST_END
]
[else
;;;; ev-ffi bindings.
(define load-libev-ffi
(load-shared-object (locate-library-object "ev/libchez-ffi.so")))
(define-syntax define-watcher
(lambda (x)
(syntax-case x ()
[(k watcher-name args ...)
(with-syntax ([make-watcher-func (make-id-syntax #'k "make-" #'watcher-name)]
[start-watcher-func (make-id-syntax #'k #'watcher-name "-start")]
[stop-watcher-func (make-id-syntax #'k #'watcher-name "-stop")]
[ev-TYPE-free (make-id-syntax #'k #'watcher-name "-free")]
[ev-TYPE-t (make-id-syntax #'k #'watcher-name "-t")]
[(ev-loop-p ...)
(if ev-multiplicity?
(list #'(* ev-loop))
(list))]
[ev-TYPE-cb-t (make-id-syntax #'k #'watcher-name "-cb-t")]
[ev-TYPE-cb-get (make-id-syntax #'k #'watcher-name "-cb-get")])
#'(begin
(define-ftype
[ev-TYPE-t (struct
(base ev-watcher))]
[ev-TYPE-cb-t (function (ev-loop-p ... (* ev-TYPE-t) int) void)])
(define watcher-name
(lambda (args ... callback-func)
(let ([watcher (make-watcher-func
args ...
(make-ftype-pointer
ev-TYPE-cb-t
(meta-cond
[ev-multiplicity?
(lambda (loop w rev)
(parameterize ([current-loop loop])
(callback-func w rev)))]
[else
cb])))])
;; Note: (locked-object? (foreign-callable-code-object (ftype-pointer-address fp-callback))) => #t
(start-watcher-func watcher)
watcher)))
(define ev-TYPE-free
(lambda (watcher)
(stop-watcher-func watcher)
;; unlock the callback function address so that Chez Scheme's gc can remove it.
(unlock-object (foreign-callable-code-object (ftype-pointer-address (ev-TYPE-cb-get watcher))))
(foreign-free (ftype-pointer-address watcher))))))])))
(define-syntax batch
(syntax-rules ()
[(_ command (def ...) ...)
(begin
(command def ...)
...)]))
(batch define-watcher
(ev-io fd events)
(ev-timer after repeat)
(ev-periodic offset interval reschedule-cb)
(ev-signal signum)
(ev-child pid trace)
(ev-stat path interval)
(ev-idle)
(ev-prepare)
(ev-check)
(ev-embed other)
(ev-fork)
(ev-cleanup)
(ev-async))
(define-ftype ev-periodic-reschedule-cb-t (function ((* ev-periodic-t) ev-tstamp) ev-tstamp))
;;; libev-ffi extensions. See ev/ev-ffi.c
(ffi-wrapper-function
(ev-is-active ((* ev-watcher)) boolean)
(ev-priority-get ((* ev-watcher)) int)
(ev-priority-set ((* ev-watcher) int) void)
;; TODO ev-cb-set
;;; Watcher specific C macro wrappers.
;; ev-io-t
(make-ev-io (int int (* ev-io-cb-t)) (* ev-io-t))
(ev-io-init ((* ev-io-t) (* ev-io-cb-t) int int) void)
(ev-io-set ((* ev-io-t) int int) void)
(ev-io-modify ((* ev-io-t) int) void)
(ev-io-cb-get ((* ev-io-t)) (* ev-io-cb-t))
(ev-io-fd-get ((* ev-io-t)) int)
(ev-io-events-get ((* ev-io-t)) int)
;; ev-timer-t
(make-ev-timer (ev-tstamp ev-tstamp (* ev-timer-cb-t)) (* ev-timer-t))
(ev-timer-init ((* ev-timer-t) (* ev-timer-cb-t) ev-tstamp ev-tstamp) void)
(ev-timer-set ((* ev-timer-t) ev-tstamp ev-tstamp) void)
(ev-timer-cb-get ((* ev-timer-t)) (* ev-timer-cb-t))
(ev-timer-repeat-get ((* ev-timer-t)) ev-tstamp)
(ev-timer-repeat-set ((* ev-timer-t) ev-tstamp) void)
;; ev-periodic-t
(make-ev-periodic (ev-tstamp ev-tstamp (* ev-periodic-reschedule-cb-t) (* ev-periodic-cb-t)) (* ev-periodic-t))
(ev-periodic-init ((* ev-periodic-t) (* ev-periodic-cb-t) ev-tstamp ev-tstamp (* ev-periodic-reschedule-cb-t)) void)
(ev-periodic-set ((* ev-periodic-t) ev-tstamp ev-tstamp (* ev-periodic-reschedule-cb-t)) void)
(ev-periodic-cb-get ((* ev-periodic-t)) (* ev-periodic-cb-t))
(ev-periodic-at ((* ev-periodic-t)) ev-tstamp)
(ev-periodic-offset-get ((* ev-periodic-t)) ev-tstamp)
(ev-periodic-offset-set ((* ev-periodic-t) ev-tstamp) void)
(ev-periodic-interval-get ((* ev-periodic-t)) ev-tstamp)
(ev-periodic-interval-set ((* ev-periodic-t) ev-tstamp) void)
(ev-periodic-reschedule-cb-get ((* ev-periodic-t)) (* ev-periodic-reschedule-cb-t))
(ev-periodic-reschedule-cb-set ((* ev-periodic-t) (* ev-periodic-reschedule-cb-t)) void)
;; ev-signal-t
(make-ev-signal (int (* ev-signal-cb-t)) (* ev-signal-t))
(ev-signal-init ((* ev-signal-t) (* ev-signal-cb-t) int) void)
(ev-signal-set ((* ev-signal-t) int) void)
(ev-signal-cb-get ((* ev-signal-t)) (* ev-signal-cb-t))
(ev-signal-signum-get ((* ev-signal-t)) int)
;; ev-child-t
(make-ev-child (int int (* ev-child-cb-t)) (* ev-child-t))
(ev-child-init ((* ev-child-t) (* ev-child-cb-t) int int) void)
(ev-child-set ((* ev-child-t) int int) void)
(ev-child-cb-get ((* ev-child-t)) (* ev-child-cb-t))
(ev-child-pid-get ((* ev-child-t)) int)
(ev-child-rpid-get ((* ev-child-t)) int)
(ev-child-rpid-set ((* ev-child-t) int) void)
(ev-child-rstatus-get ((* ev-child-t)) int)
(ev-child-rstatus-set ((* ev-child-t) int) void)
;; ev-stat-t
(make-ev-stat (string ev-tstamp (* ev-stat-cb-t)) (* ev-stat-t))
(ev-stat-init ((* ev-stat-t) (* ev-stat-cb-t) string ev-tstamp) void)
(ev-stat-set ((* ev-stat-t) string ev-tstamp) void)
(ev-stat-cb-get ((* ev-stat-t)) (* ev-stat-cb-t))
(ev-stat-path-get ((* ev-stat-t)) (* const-char))
(ev-stat-interval-get ((* ev-stat-t)) (* const-char))
(ev-stat-prev-get ((* ev-stat-t)) (* ev-statdata))
(ev-stat-attr-get ((* ev-stat-t)) (* ev-statdata))
;; ev-idle-t
(make-ev-idle ((* ev-idle-cb-t)) (* ev-idle-t))
(ev-idle-init ((* ev-idle-t) (* ev-idle-cb-t)) void)
(ev-idle-cb-get ((* ev-idle-t)) (* ev-idle-cb-t))
;; ev-prepare-t
(make-ev-prepare ((* ev-prepare-cb-t)) (* ev-prepare-t))
(ev-prepare-init ((* ev-prepare-t) (* ev-prepare-cb-t)) void)
(ev-prepare-cb-get ((* ev-prepare-t)) (* ev-prepare-cb-t))
;; ev-check-t
(make-ev-check ((* ev-check-cb-t)) (* ev-check-t))
(ev-check-init ((* ev-check-t) (* ev-check-cb-t)) void)
(ev-check-cb-get ((* ev-check-t)) (* ev-check-cb-t))
;; ev-embed-t
(make-ev-embed ((* ev-loop) (* ev-embed-cb-t)) (* ev-embed-t))
(ev-embed-init ((* ev-embed-t) (* ev-embed-cb-t) (* ev-loop)) void)
(ev-embed-set ((* ev-embed-t) (* ev-loop)) void)
(ev-embed-cb-get ((* ev-embed-t)) (* ev-embed-cb-t))
(ev-embed-other-get ((* ev-embed-t)) (* ev-loop))
;; ev-fork-t
(make-ev-fork ((* ev-fork-cb-t)) (* ev-fork-t))
(ev-fork-init ((* ev-fork-t) (* ev-fork-cb-t)) void)
(ev-fork-cb-get ((* ev-fork-t)) (* ev-fork-cb-t))
;; ev-cleanup-t
(make-ev-cleanup ((* ev-cleanup-cb-t)) (* ev-cleanup-t))
(ev-cleanup-init ((* ev-cleanup-t) (* ev-cleanup-cb-t)) void)
(ev-cleanup-cb-get ((* ev-cleanup-t)) (* ev-cleanup-cb-t))
;; ev-async-t
(make-ev-async ((* ev-async-cb-t)) (* ev-async-t))
(ev-async-init ((* ev-async-t) (* ev-async-cb-t)) void)
(ev-async-cb-get ((* ev-async-t)) (* ev-async-cb-t))
(ev-async-pending ((* ev-async-t)) boolean)
)
])
;; These simple libev functions do not use default arguments.
(define-syntax ev-simple-function
(syntax-rules ()
[(_ (name rest ...) ...)
(ev-function (name () rest ...) ...)]))
(ev-simple-function
;;;;;;; EV_PROTOTYPES
;; meta funcs
(ev-version-major () int)
(ev-version-minor () int)
(ev-supported-backends () unsigned)
(ev-recommended-backends () unsigned)
(ev-embeddable-backends () unsigned)
;; time related
(ev-time () ev-tstamp)
(ev-sleep (ev-tstamp) void)
(ev-set-allocator ((* realloc-fn)) void)
(ev-set-syserr-cb ((* msg-cb-fn)) void)
(ev-default-loop (int) (* ev-loop)
(case-lambda
[()
(c/func 0)]
[(flags)
(c/func flags)]))
(ev-loop-new (int) (* ev-loop)
(case-lambda
[()
(c/func 0)]
[(flags)
(c/func flags)]))
(ev-feed-signal (int) void)
)
;; [parameter] current-loop
(define current-loop
(make-parameter (ev-default-loop)))
;; ev-multiplicity? == #t:
;; Public function wrappers are generated so the actual first argument to the underlying libev function
;; is *always* invoked with `(current-loop)`.
;; Clients can control which loop to use by overriding parameter `(current-loop)`.
(meta-cond
[ev-multiplicity?
(define-syntax ev-loop-function
(lambda (stx)
(syntax-case stx ()
[(_ (default-type default-instance) (name rest ...) ...)
#'(ev-function
(name (default-type default-instance) rest ...) ...)])))]
[else
(define-syntax ev-loop-function
(lambda (stx)
(syntax-case stx ()
[(_ (default-type default-instance) (name rest ...) ...)
;; Ignore defaults. libev must be compiled without starting ev_loop* params.
#'(ev-function
(name () rest ...) ...)])))])
(ev-loop-function ((* ev-loop) (current-loop))
(ev-break (int) void
(case-lambda
[()
(c/func (evbreak ONE))]
[(how)
(c/func how)]))
(ev-run (int) boolean
(case-lambda
[()
(c/func 0)]
[(flags)
(c/func flags)]))
(ev-now () ev-tstamp)
;; TODO with destroy, maybe the (current-loop) should be invalidated?
(ev-loop-destroy () void)
(ev-loop-fork () void)
(ev-backend () unsigned)
(ev-now-update () void)
(ev-ref () void)
(ev-unref () void)
;; TODO
#;(ev-once (int int ev-tstamp (* ev-cb-t) void*) void)
;;;; EV_FEATURE_API
(ev-iteration () unsigned)
(ev-depth () unsigned)
(ev-verify () void)
(ev-set-io-collect-interval (ev-tstamp) void)
(ev-set-timeout-collect-interval (ev-tstamp) void)
(ev-set-userdata (void*) void)
(ev-userdata () void*)
;; TODO wrap these threading callback setters.
(ev-set-invoke-pending-cb ((* ev-loop-callback)) void)
(ev-set-loop-release-cb ((* ev-loop-callback) (* ev-loop-callback)) void)
(ev-pending-count () unsigned)
(ev-invoke-pending () void)
(ev-suspend () void)
(ev-resume () void)
;; event loop manipulation.
(ev-feed-event ((* ev-watcher) int) void)
(ev-feed-fd-event (int int) void)
(ev-feed-signal-event(int) void)
(ev-invoke ((* ev-watcher) int) void)
(ev-clear-pending ((* ev-watcher)) int)
;; event watcher control.
(ev-io-start ((* ev-io-t)) void)
(ev-io-stop ((* ev-io-t)) void)
(ev-timer-start ((* ev-timer-t)) void)
(ev-timer-stop ((* ev-timer-t)) void)
(ev-timer-again ((* ev-timer-t)) void)
(ev-timer-remaining ((* ev-timer-t)) ev-tstamp)
(ev-periodic-start ((* ev-periodic-t)) void)
(ev-periodic-stop ((* ev-periodic-t)) void)
(ev-periodic-again ((* ev-periodic-t)) void)
(ev-signal-start ((* ev-signal-t)) void)
(ev-signal-stop ((* ev-signal-t)) void)
(ev-child-start ((* ev-child-t)) void)
(ev-child-stop ((* ev-child-t)) void)
(ev-stat-start ((* ev-stat-t)) void)
(ev-stat-stop ((* ev-stat-t)) void)
(ev-stat-stat ((* ev-stat-t)) void)
(ev-idle-start ((* ev-idle-t)) void)
(ev-idle-stop ((* ev-idle-t)) void)
(ev-prepare-start ((* ev-prepare-t)) void)
(ev-prepare-stop ((* ev-prepare-t)) void)
(ev-check-start ((* ev-check-t)) void)
(ev-check-stop ((* ev-check-t)) void)
(ev-fork-start ((* ev-fork-t)) void)
(ev-fork-stop ((* ev-fork-t)) void)
(ev-cleanup-start ((* ev-cleanup-t)) void)
(ev-cleanup-stop ((* ev-cleanup-t)) void)
(ev-embed-start ((* ev-embed-t)) void)
(ev-embed-stop ((* ev-embed-t)) void)
(ev-embed-sweep ((* ev-embed-t)) void)
(ev-async-start ((* ev-async-t)) void)
(ev-async-stop ((* ev-async-t)) void)
(ev-async-send ((* ev-async-t)) void)
)
;; TODO
;; (define ev-set-allocator)
;; (define ev-set-syserr-cb)
;;;; PURE_TEST_START
;; This section contains extensions to the base ev api needed by both pure and ffi
;; wrapped versions.
(define ev-periodic-free*
(lambda (watcher)
(ev-periodic-free watcher)
(let ([rcb (ev-periodic-reschedule-cb-get watcher)])
(unless (ftype-pointer-null? rcb)
(unlock-object (foreign-callable-code-object (ftype-pointer-address rcb)))))))
(define ev-stat-path-get*
(lambda (ev-t)
(const-char*->string (ev-stat-path-get ev-t))))
(define ev-stat-free*
(lambda (ev-t)
(unless (ftype-pointer-null? (ev-stat-path-get ev-t))
(foreign-free (ftype-pointer-address (ev-stat-path-get ev-t))))
(ev-stat-free ev-t)))
;;;; PURE_TEST_END
(define-syntax ev-ms
(syntax-rules ()
[(_ ms)
(inexact (/ ms 1000))]))
(define time->number
(lambda (t)
(+ (time-second t)
(inexact (* (time-nanosecond t) (expt 10 -9))))))
(define time->absolute-number
(lambda (t)
(time->number
(case (time-type t)
[(time-duration)
(add-duration (current-time) t)]
[(time-utc)
t]
[else
(error 'time->absolute-number "time-utc or time-duration argument required" t)]))))
;; There are three main ways to use ev-periodic.
;; Expose convenience wrappers for them rather than the low level ev-periodic.
;; See libev(3)
(define-syntax ev-absolute-timer
(syntax-rules ()
[(_ time cb)
(ev-periodic (time->absolute-number time) 0 (make-ftype-pointer ev-periodic-reschedule-cb-t 0) cb)]))
(define-syntax ev-interval-timer
(syntax-rules ()
[(_ interval cb)
(ev-periodic 0. interval (make-ftype-pointer ev-periodic-reschedule-cb-t 0) cb)]
[(_ offset interval cb)
(ev-periodic offset interval (make-ftype-pointer ev-periodic-reschedule-cb-t 0) cb)]))
(define-syntax ev-manual-timer
(syntax-rules ()
[(_ reschedule-cb cb)
;; Consider wrapping reschedule-cb such that 'now' is converted to a time object
;; and return is assumed to be another time object that's converted to ev-tstamp.
(ev-periodic 0 0 (make-ftype-pointer ev-periodic-reschedule-cb-t reschedule-cb) cb)]))
)