1 #define _XOPEN_SOURCE 600
2 #ifdef HAVE_SYS_SELECT_H
3 # include <sys/select.h>
21 #if defined(__linux__)
22 # define MQD_TO_FD(mqd) (int)(mqd)
23 #elif defined(HAVE___MQ_OSHANDLE) /* FreeBSD */
24 # define MQD_TO_FD(mqd) __mq_oshandle(mqd)
26 # warning mqd_t is not select()-able on your OS
27 # define MQ_IO_MARK(mq) ((void)(0))
28 # define MQ_IO_SET(mq,val) ((void)(0))
32 # define MQ_IO_MARK(mq) rb_gc_mark((mq)->io)
33 # define MQ_IO_SET(mq,val) do { (mq)->io = (val); } while (0)
46 static VALUE cPOSIX_MQ
, cAttr
;
47 static ID id_new
, id_kill
, id_fileno
;
48 static ID sym_r
, sym_w
, sym_rw
;
49 static const mqd_t MQD_INVALID
= (mqd_t
)-1;
51 /* Ruby 1.8.6+ macros (for compatibility with Ruby 1.9) */
53 # define RSTRING_PTR(s) (RSTRING(s)->ptr)
56 # define RSTRING_LEN(s) (RSTRING(s)->len)
59 # define RSTRUCT_PTR(s) (RSTRUCT(s)->ptr)
62 # define RSTRUCT_LEN(s) (RSTRUCT(s)->len)
65 #ifndef HAVE_RB_STR_SET_LEN
67 # define rb_str_set_len(str,len) rb_str_resize(str,len)
68 # else /* 1.8.6 optimized version */
69 /* this is taken from Ruby 1.8.7, 1.8.6 may not have it */
70 static void rb_18_str_set_len(VALUE str
, long len
)
72 RSTRING(str
)->len
= len
;
73 RSTRING(str
)->ptr
[len
] = '\0';
75 # define rb_str_set_len(str,len) rb_18_str_set_len(str,len)
76 # endif /* ! RUBINIUS */
77 #endif /* !defined(HAVE_RB_STR_SET_LEN) */
79 #ifndef HAVE_RB_STRUCT_ALLOC_NOINIT
80 static VALUE
rb_struct_alloc_noinit(VALUE
class)
82 return rb_funcall(class, id_new
, 0, 0);
84 #endif /* !defined(HAVE_RB_STRUCT_ALLOC_NOINIT) */
86 /* partial emulation of the 1.9 rb_thread_blocking_region under 1.8 */
87 #ifndef HAVE_RB_THREAD_BLOCKING_REGION
89 # define RUBY_UBF_IO ((rb_unblock_function_t *)-1)
90 typedef void rb_unblock_function_t(void *);
91 typedef VALUE
rb_blocking_function_t(void *);
93 rb_thread_blocking_region(
94 rb_blocking_function_t
*func
, void *data1
,
95 rb_unblock_function_t
*ubf
, void *data2
)
99 assert(RUBY_UBF_IO
== ubf
&& "RUBY_UBF_IO required for emulation");
107 #endif /* ! HAVE_RB_THREAD_BLOCKING_REGION */
109 /* used to pass arguments to mq_open inside blocking region */
118 /* used to pass arguments to mq_send/mq_receive inside blocking region */
124 struct timespec
*timeout
;
127 /* hope it's there..., TODO: a better version that works in rbx */
128 struct timeval
rb_time_interval(VALUE
);
130 static struct timespec
*convert_timeout(struct timespec
*dest
, VALUE time
)
132 struct timeval tv
, now
;
137 tv
= rb_time_interval(time
); /* aggregate return :( */
138 gettimeofday(&now
, NULL
);
139 dest
->tv_sec
= now
.tv_sec
+ tv
.tv_sec
;
140 dest
->tv_nsec
= (now
.tv_usec
+ tv
.tv_usec
) * 1000;
142 if (dest
->tv_nsec
> 1000000000) {
143 dest
->tv_nsec
-= 1000000000;
150 /* runs without GVL */
151 static VALUE
xopen(void *ptr
)
153 struct open_args
*x
= ptr
;
157 case 2: rv
= mq_open(x
->name
, x
->oflags
); break;
158 case 3: rv
= mq_open(x
->name
, x
->oflags
, x
->mode
, NULL
); break;
159 case 4: rv
= mq_open(x
->name
, x
->oflags
, x
->mode
, &x
->attr
); break;
160 default: rv
= MQD_INVALID
;
166 /* runs without GVL */
167 static VALUE
xsend(void *ptr
)
169 struct rw_args
*x
= ptr
;
172 return (VALUE
)mq_timedsend(x
->des
, x
->msg_ptr
, x
->msg_len
,
173 x
->msg_prio
, x
->timeout
);
175 return (VALUE
)mq_send(x
->des
, x
->msg_ptr
, x
->msg_len
, x
->msg_prio
);
178 /* runs without GVL */
179 static VALUE
xrecv(void *ptr
)
181 struct rw_args
*x
= ptr
;
184 return (VALUE
)mq_timedreceive(x
->des
, x
->msg_ptr
, x
->msg_len
,
185 &x
->msg_prio
, x
->timeout
);
187 return (VALUE
)mq_receive(x
->des
, x
->msg_ptr
, x
->msg_len
, &x
->msg_prio
);
190 /* runs without GVL, path resolution may be slow */
191 static VALUE
xunlink(void *ptr
)
193 VALUE name
= (VALUE
)ptr
;
195 return (VALUE
)mq_unlink(RSTRING_PTR(name
));
199 static void mark(void *ptr
)
201 struct posix_mq
*mq
= ptr
;
203 rb_gc_mark(mq
->name
);
204 rb_gc_mark(mq
->thread
);
209 static void _free(void *ptr
)
211 struct posix_mq
*mq
= ptr
;
213 if (mq
->des
!= MQD_INVALID
) {
214 /* we ignore errors when gc-ing */
215 int saved_errno
= errno
;
223 /* automatically called at creation (before initialize) */
224 static VALUE
alloc(VALUE klass
)
227 VALUE rv
= Data_Make_Struct(klass
, struct posix_mq
, mark
, _free
, mq
);
229 mq
->des
= MQD_INVALID
;
230 mq
->attr
.mq_flags
= 0;
231 mq
->attr
.mq_maxmsg
= 0;
232 mq
->attr
.mq_msgsize
= -1;
233 mq
->attr
.mq_curmsgs
= 0;
241 /* unwraps the posix_mq struct from self */
242 static struct posix_mq
*get(VALUE self
, int need_valid
)
246 Data_Get_Struct(self
, struct posix_mq
, mq
);
248 if (need_valid
&& mq
->des
== MQD_INVALID
)
249 rb_raise(rb_eIOError
, "closed queue descriptor");
254 /* converts the POSIX_MQ::Attr astruct into a struct mq_attr attr */
255 static void attr_from_struct(struct mq_attr
*attr
, VALUE astruct
, int all
)
259 if (CLASS_OF(astruct
) != cAttr
)
260 rb_raise(rb_eArgError
, "not a POSIX_MQ::Attr: %s",
261 RSTRING_PTR(rb_inspect(astruct
)));
263 ptr
= RSTRUCT_PTR(astruct
);
265 attr
->mq_flags
= NUM2LONG(ptr
[0]);
267 if (all
|| !NIL_P(ptr
[1]))
268 attr
->mq_maxmsg
= NUM2LONG(ptr
[1]);
269 if (all
|| !NIL_P(ptr
[2]))
270 attr
->mq_msgsize
= NUM2LONG(ptr
[2]);
272 attr
->mq_curmsgs
= NUM2LONG(ptr
[3]);
277 * POSIX_MQ.new(name [, flags [, mode [, mq_attr]]) => mq
279 * Opens a POSIX message queue given by +name+. +name+ should start
280 * with a slash ("/") for portable applications.
282 * If a Symbol is given in place of integer +flags+, then:
284 * * +:r+ is equivalent to IO::RDONLY
285 * * +:w+ is equivalent to IO::CREAT|IO::WRONLY
286 * * +:rw+ is equivalent to IO::CREAT|IO::RDWR
288 * +mode+ is an integer and only used when IO::CREAT is used.
289 * +mq_attr+ is a POSIX_MQ::Attr and only used if IO::CREAT is used.
290 * If +mq_attr+ is not specified when creating a queue, then the
291 * system defaults will be used.
293 * See the manpage for mq_open(3) for more details on this function.
295 static VALUE
init(int argc
, VALUE
*argv
, VALUE self
)
297 struct posix_mq
*mq
= get(self
, 0);
299 VALUE name
, oflags
, mode
, attr
;
301 rb_scan_args(argc
, argv
, "13", &name
, &oflags
, &mode
, &attr
);
303 if (TYPE(name
) != T_STRING
)
304 rb_raise(rb_eArgError
, "name must be a string");
306 switch (TYPE(oflags
)) {
313 else if (oflags
== sym_w
)
314 x
.oflags
= O_CREAT
|O_WRONLY
;
315 else if (oflags
== sym_rw
)
316 x
.oflags
= O_CREAT
|O_RDWR
;
318 rb_raise(rb_eArgError
,
319 "symbol must be :r, :w, or :rw: %s",
320 RSTRING_PTR(rb_inspect(oflags
)));
324 x
.oflags
= NUM2INT(oflags
);
327 rb_raise(rb_eArgError
, "flags must be an int, :r, :w, or :wr");
330 x
.name
= RSTRING_PTR(name
);
333 switch (TYPE(mode
)) {
336 x
.mode
= NUM2UINT(mode
);
339 if (x
.oflags
& O_CREAT
) {
345 rb_raise(rb_eArgError
, "mode not an integer");
348 switch (TYPE(attr
)) {
351 attr_from_struct(&x
.attr
, attr
, 1);
353 /* principle of least surprise */
354 if (x
.attr
.mq_flags
& O_NONBLOCK
)
355 x
.oflags
|= O_NONBLOCK
;
360 rb_raise(rb_eArgError
, "attr must be a POSIX_MQ::Attr: %s",
361 RSTRING_PTR(rb_inspect(attr
)));
364 mq
->des
= (mqd_t
)rb_thread_blocking_region(xopen
, &x
, RUBY_UBF_IO
, 0);
365 if (mq
->des
== MQD_INVALID
)
366 rb_sys_fail("mq_open");
368 mq
->name
= rb_str_dup(name
);
369 if (x
.oflags
& O_NONBLOCK
)
370 mq
->attr
.mq_flags
= O_NONBLOCK
;
377 * POSIX_MQ.unlink(name) => 1
379 * Unlinks the message queue given by +name+. The queue will be destroyed
380 * when the last process with the queue open closes its queue descriptors.
382 static VALUE
s_unlink(VALUE self
, VALUE name
)
385 void *ptr
= (void *)name
;
387 if (TYPE(name
) != T_STRING
)
388 rb_raise(rb_eArgError
, "argument must be a string");
390 rv
= (mqd_t
)rb_thread_blocking_region(xunlink
, ptr
, RUBY_UBF_IO
, 0);
391 if (rv
== MQD_INVALID
)
392 rb_sys_fail("mq_unlink");
401 * Unlinks the message queue to prevent other processes from accessing it.
402 * All existing queue descriptors to this queue including those opened by
403 * other processes are unaffected. The queue will only be destroyed
404 * when the last process with open descriptors to this queue closes
407 static VALUE
_unlink(VALUE self
)
409 struct posix_mq
*mq
= get(self
, 0);
411 void *ptr
= (void *)mq
->name
;
413 assert(TYPE(mq
->name
) == T_STRING
&& "mq->name is not a string");
415 rv
= (mqd_t
)rb_thread_blocking_region(xunlink
, ptr
, RUBY_UBF_IO
, 0);
416 if (rv
== MQD_INVALID
)
417 rb_sys_fail("mq_unlink");
422 static void setup_send_buffer(struct rw_args
*x
, VALUE buffer
)
424 buffer
= rb_obj_as_string(buffer
);
425 x
->msg_ptr
= RSTRING_PTR(buffer
);
426 x
->msg_len
= (size_t)RSTRING_LEN(buffer
);
431 * mq.send(string [,priority[, timeout]]) => nil
433 * Inserts the given +string+ into the message queue with an optional,
434 * unsigned integer +priority+. If the optional +timeout+ is specified,
435 * then Errno::ETIMEDOUT will be raised if the operation cannot complete
436 * before +timeout+ seconds has elapsed. Without +timeout+, this method
437 * may block until the queue is writable.
439 static VALUE
_send(int argc
, VALUE
*argv
, VALUE self
)
441 struct posix_mq
*mq
= get(self
, 1);
443 VALUE buffer
, prio
, timeout
;
445 struct timespec expire
;
447 rb_scan_args(argc
, argv
, "12", &buffer
, &prio
, &timeout
);
449 setup_send_buffer(&x
, buffer
);
451 x
.timeout
= convert_timeout(&expire
, timeout
);
452 x
.msg_prio
= NIL_P(prio
) ? 0 : NUM2UINT(prio
);
454 if (mq
->attr
.mq_flags
& O_NONBLOCK
)
455 rv
= (mqd_t
)xsend(&x
);
457 rv
= (mqd_t
)rb_thread_blocking_region(xsend
, &x
,
459 if (rv
== MQD_INVALID
)
460 rb_sys_fail("mq_send");
469 * Inserts the given +string+ into the message queue with a
470 * default priority of 0 and no timeout.
472 static VALUE
send0(VALUE self
, VALUE buffer
)
474 struct posix_mq
*mq
= get(self
, 1);
478 setup_send_buffer(&x
, buffer
);
483 rv
= (mqd_t
)rb_thread_blocking_region(xsend
, &x
, RUBY_UBF_IO
, 0);
484 if (rv
== MQD_INVALID
)
485 rb_sys_fail("mq_send");
495 * Returns an IO.select-able +IO+ object. This method is only available
496 * under Linux and is not intended to be portable.
498 static VALUE
to_io(VALUE self
)
500 struct posix_mq
*mq
= get(self
, 1);
501 int fd
= MQD_TO_FD(mq
->des
);
504 mq
->io
= rb_funcall(rb_cIO
, id_new
, 1, INT2NUM(fd
));
510 static VALUE
_receive(int wantarray
, int argc
, VALUE
*argv
, VALUE self
);
514 * mq.receive([buffer, [timeout]]) => [ message, priority ]
516 * Takes the highest priority message off the queue and returns
517 * an array containing the message as a String and the Integer
518 * priority of the message.
520 * If the optional +buffer+ is present, then it must be a String
521 * which will receive the data.
523 * If the optional +timeout+ is present, then it may be a Float
524 * or Integer specifying the timeout in seconds. Errno::ETIMEDOUT
525 * will be raised if +timeout+ has elapsed and there are no messages
528 static VALUE
receive(int argc
, VALUE
*argv
, VALUE self
)
530 return _receive(1, argc
, argv
, self
);
535 * mq.shift([buffer, [timeout]]) => message
537 * Takes the highest priority message off the queue and returns
538 * the message as a String.
540 * If the optional +buffer+ is present, then it must be a String
541 * which will receive the data.
543 * If the optional +timeout+ is present, then it may be a Float
544 * or Integer specifying the timeout in seconds. Errno::ETIMEDOUT
545 * will be raised if +timeout+ has elapsed and there are no messages
548 static VALUE
shift(int argc
, VALUE
*argv
, VALUE self
)
550 return _receive(0, argc
, argv
, self
);
553 static VALUE
_receive(int wantarray
, int argc
, VALUE
*argv
, VALUE self
)
555 struct posix_mq
*mq
= get(self
, 1);
557 VALUE buffer
, timeout
;
559 struct timespec expire
;
561 if (mq
->attr
.mq_msgsize
< 0) {
562 if (mq_getattr(mq
->des
, &mq
->attr
) < 0)
563 rb_sys_fail("mq_getattr");
566 rb_scan_args(argc
, argv
, "02", &buffer
, &timeout
);
567 x
.timeout
= convert_timeout(&expire
, timeout
);
570 buffer
= rb_str_new(0, mq
->attr
.mq_msgsize
);
573 rb_str_modify(buffer
);
574 rb_str_resize(buffer
, mq
->attr
.mq_msgsize
);
577 x
.msg_ptr
= RSTRING_PTR(buffer
);
578 x
.msg_len
= (size_t)mq
->attr
.mq_msgsize
;
581 if (mq
->attr
.mq_flags
& O_NONBLOCK
) {
582 r
= (ssize_t
)xrecv(&x
);
584 r
= (ssize_t
)rb_thread_blocking_region(xrecv
, &x
,
588 rb_sys_fail("mq_receive");
590 rb_str_set_len(buffer
, r
);
593 return rb_ary_new3(2, buffer
, UINT2NUM(x
.msg_prio
));
601 * Returns a POSIX_MQ::Attr struct containing the attributes
602 * of the message queue. See the mq_getattr(3) manpage for
605 static VALUE
getattr(VALUE self
)
607 struct posix_mq
*mq
= get(self
, 1);
611 if (mq_getattr(mq
->des
, &mq
->attr
) < 0)
612 rb_sys_fail("mq_getattr");
614 astruct
= rb_struct_alloc_noinit(cAttr
);
615 ptr
= RSTRUCT_PTR(astruct
);
616 ptr
[0] = LONG2NUM(mq
->attr
.mq_flags
);
617 ptr
[1] = LONG2NUM(mq
->attr
.mq_maxmsg
);
618 ptr
[2] = LONG2NUM(mq
->attr
.mq_msgsize
);
619 ptr
[3] = LONG2NUM(mq
->attr
.mq_curmsgs
);
626 * mq.attr = POSIX_MQ::Attr(IO::NONBLOCK) => mq_attr
628 * Only the IO::NONBLOCK flag may be set or unset (zero) in this manner.
629 * See the mq_setattr(3) manpage for more details.
631 * Consider using the POSIX_MQ#nonblock= method as it is easier and
632 * more natural to use.
634 static VALUE
setattr(VALUE self
, VALUE astruct
)
636 struct posix_mq
*mq
= get(self
, 1);
637 struct mq_attr newattr
;
639 attr_from_struct(&newattr
, astruct
, 0);
641 if (mq_setattr(mq
->des
, &newattr
, NULL
) < 0)
642 rb_sys_fail("mq_setattr");
651 * Closes the underlying message queue descriptor.
652 * If this descriptor had a registered notification request, the request
653 * will be removed so another descriptor or process may register a
654 * notification request. Message queue descriptors are automatically
655 * closed by garbage collection.
657 static VALUE
_close(VALUE self
)
659 struct posix_mq
*mq
= get(self
, 1);
661 if (mq_close(mq
->des
) < 0)
662 rb_sys_fail("mq_close");
664 mq
->des
= MQD_INVALID
;
672 * mq.closed? => true or false
674 * Returns +true+ if the message queue descriptor is closed and therefore
675 * unusable, otherwise +false+
677 static VALUE
closed(VALUE self
)
679 struct posix_mq
*mq
= get(self
, 0);
681 return mq
->des
== MQD_INVALID
? Qtrue
: Qfalse
;
688 * Returns the string name of message queue associated with +mq+
690 static VALUE
name(VALUE self
)
692 struct posix_mq
*mq
= get(self
, 0);
697 static int lookup_sig(VALUE sig
)
703 sig
= rb_obj_as_string(sig
);
704 len
= RSTRING_LEN(sig
);
705 ptr
= RSTRING_PTR(sig
);
707 if (len
> 3 && !memcmp("SIG", ptr
, 3))
708 sig
= rb_str_new(ptr
+ 3, len
- 3);
711 VALUE mSignal
= rb_define_module("Signal"""); /* avoid RDoc */
713 list
= rb_funcall(mSignal
, rb_intern("list"), 0, 0);
714 rb_global_variable(&list
);
717 sig
= rb_hash_aref(list
, sig
);
719 rb_raise(rb_eArgError
, "invalid signal: %s\n",
720 RSTRING_PTR(rb_inspect(sig
)));
725 /* we spawn a thread just to write ONE byte into an fd (usually a pipe) */
726 static void thread_notify_fd(union sigval sv
)
728 int fd
= sv
.sival_int
;
730 while ((write(fd
, "", 1) < 0) && (errno
== EINTR
|| errno
== EAGAIN
));
733 static void setup_notify_io(struct sigevent
*not, VALUE io
)
735 VALUE fileno
= rb_funcall(io
, id_fileno
, 0, 0);
736 int fd
= NUM2INT(fileno
);
740 if ((e
= pthread_attr_init(&attr
)))
742 if ((e
= pthread_attr_setdetachstate(&attr
, PTHREAD_CREATE_DETACHED
)))
744 #ifdef PTHREAD_STACK_MIN
745 (void)pthread_attr_setstacksize(&attr
, PTHREAD_STACK_MIN
);
747 # warning PTHREAD_STACK_MIN not available,
749 not->sigev_notify
= SIGEV_THREAD
;
750 not->sigev_notify_function
= thread_notify_fd
;
751 not->sigev_notify_attributes
= &attr
;
752 not->sigev_value
.sival_int
= fd
;
755 rb_raise(rb_eRuntimeError
, "pthread failure: %s\n", strerror(e
));
760 * mq.notify = signal => signal
762 * Registers the notification request to deliver a given +signal+
763 * to the current process when message is received.
764 * If +signal+ is +nil+, it will unregister and disable the notification
765 * request to allow other processes to register a request.
766 * If +signal+ is +false+, it will register a no-op notification request
767 * which will prevent other processes from registering a notification.
768 * If +signal+ is an +IO+ object, it will spawn a thread upon the
769 * arrival of the next message and write one "\\0" byte to the file
770 * descriptor belonging to that IO object.
771 * Only one process may have a notification request for a queue
772 * at a time, Errno::EBUSY will be raised if there is already
773 * a notification request registration for the queue.
775 * Notifications are only fired once and processes must reregister
776 * for subsequent notifications.
778 * For readers of the mq_notify(3) manpage, passing +false+
779 * is equivalent to SIGEV_NONE, and passing +nil+ is equivalent
780 * of passing a NULL notification pointer to mq_notify(3).
782 static VALUE
setnotify(VALUE self
, VALUE arg
)
784 struct posix_mq
*mq
= get(self
, 1);
786 struct sigevent
* notification
= ¬
789 if (!NIL_P(mq
->thread
)) {
790 rb_funcall(mq
->thread
, id_kill
, 0, 0);
793 not.sigev_notify
= SIGEV_SIGNAL
;
797 not.sigev_notify
= SIGEV_NONE
;
803 not.sigev_signo
= NUM2INT(arg
);
807 not.sigev_signo
= lookup_sig(arg
);
808 rv
= INT2NUM(not.sigev_signo
);
811 setup_notify_io(¬, arg
);
814 /* maybe support Proc+thread via sigev_notify_function.. */
815 rb_raise(rb_eArgError
, "must be a signal or nil");
818 if (mq_notify(mq
->des
, notification
) < 0)
819 rb_sys_fail("mq_notify");
826 * mq.nonblock? => true or false
828 * Returns the current non-blocking state of the message queue descriptor.
830 static VALUE
getnonblock(VALUE self
)
832 struct posix_mq
*mq
= get(self
, 1);
834 return mq
->attr
.mq_flags
& O_NONBLOCK
? Qtrue
: Qfalse
;
839 * mq.nonblock = boolean => boolean
841 * Enables or disables non-blocking operation for the message queue
842 * descriptor. Errno::EAGAIN will be raised in situations where
843 * the queue would block. This is not compatible with +timeout+
844 * arguments to POSIX_MQ#send and POSIX_MQ#receive.
846 static VALUE
setnonblock(VALUE self
, VALUE nb
)
848 struct mq_attr newattr
;
849 struct posix_mq
*mq
= get(self
, 1);
852 newattr
.mq_flags
= O_NONBLOCK
;
853 else if (nb
== Qfalse
)
854 newattr
.mq_flags
= 0;
856 rb_raise(rb_eArgError
, "must be true or false");
858 if (mq_setattr(mq
->des
, &newattr
, &mq
->attr
) < 0)
859 rb_sys_fail("mq_setattr");
861 mq
->attr
.mq_flags
= newattr
.mq_flags
;
867 static VALUE
setnotifythread(VALUE self
, VALUE thread
)
869 struct posix_mq
*mq
= get(self
, 1);
875 void Init_posix_mq_ext(void)
877 cPOSIX_MQ
= rb_define_class("POSIX_MQ", rb_cObject
);
878 rb_define_alloc_func(cPOSIX_MQ
, alloc
);
879 cAttr
= rb_const_get(cPOSIX_MQ
, rb_intern("Attr"));
882 * The maximum number of open message descriptors supported
883 * by the system. This may be -1, in which case it is dynamically
884 * set at runtime. Consult your operating system documentation
885 * for system-specific information about this.
887 rb_define_const(cPOSIX_MQ
, "OPEN_MAX",
888 LONG2NUM(sysconf(_SC_MQ_OPEN_MAX
)));
891 * The maximum priority that may be specified for POSIX_MQ#send
892 * On POSIX-compliant systems, this is at least 31, but some
893 * systems allow higher limits.
894 * The minimum priority is always zero.
896 rb_define_const(cPOSIX_MQ
, "PRIO_MAX",
897 LONG2NUM(sysconf(_SC_MQ_PRIO_MAX
)));
899 rb_define_singleton_method(cPOSIX_MQ
, "unlink", s_unlink
, 1);
901 rb_define_method(cPOSIX_MQ
, "initialize", init
, -1);
902 rb_define_method(cPOSIX_MQ
, "send", _send
, -1);
903 rb_define_method(cPOSIX_MQ
, "<<", send0
, 1);
904 rb_define_method(cPOSIX_MQ
, "receive", receive
, -1);
905 rb_define_method(cPOSIX_MQ
, "shift", shift
, -1);
906 rb_define_method(cPOSIX_MQ
, "attr", getattr
, 0);
907 rb_define_method(cPOSIX_MQ
, "attr=", setattr
, 1);
908 rb_define_method(cPOSIX_MQ
, "close", _close
, 0);
909 rb_define_method(cPOSIX_MQ
, "closed?", closed
, 0);
910 rb_define_method(cPOSIX_MQ
, "unlink", _unlink
, 0);
911 rb_define_method(cPOSIX_MQ
, "name", name
, 0);
912 rb_define_method(cPOSIX_MQ
, "notify=", setnotify
, 1);
913 rb_define_method(cPOSIX_MQ
, "nonblock=", setnonblock
, 1);
914 rb_define_method(cPOSIX_MQ
, "notify_thread=", setnotifythread
, 1);
915 rb_define_method(cPOSIX_MQ
, "nonblock?", getnonblock
, 0);
917 rb_define_method(cPOSIX_MQ
, "to_io", to_io
, 0);
920 id_new
= rb_intern("new");
921 id_kill
= rb_intern("kill");
922 id_fileno
= rb_intern("fileno");
923 sym_r
= ID2SYM(rb_intern("r"));
924 sym_w
= ID2SYM(rb_intern("w"));
925 sym_rw
= ID2SYM(rb_intern("rw"));