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Fg 19 w(can) 21 b(be) f(used) f(if) i(pr) n(eferr) n(ed) n(.) 27
340
b(Behaviour) 20 b(is) g(unde\002ne) n(d) g(when) f(a) i(thr) n(ead) f
341
(attempt) n(s) 221 2506 y(to) 30 b(lock) h(the) e(same) i(mutex) f
342
(again) h(or) f(when) g(a) h(mutex) f(is) h(locked) e(by) i(one) e(thr)
343
n(ead) h(and) h(un-) 221 2619 y(locked) 22 b(by) h(a) g(dif) n(fer) n
344
(ent) f(thr) n(ead.) p Fc 221 2874 a(2.2) 99 b(Condition) 26
345
b(V) -11 b(ariable) p Fg 221 3051 a(A) 28 b(condition) f(varia) r(ble) h
346
(is) g(r) n(epr) n(ese) n(nted) f(by) h(an) p Fd 28 w(omn) n(i_con) n
347
(diti) n(on) p Fg 27 w(and) g(is) g(used) e(for) i(sig-) 221
348
3164 y(nalli) r(ng) 20 b(betwee) n(n) g(thr) n(eads.) 26
349
b(A) 21 b(call) h(to) p Fd 19 w(wait\() n(\)) p Fg 20
350
w(causes) e(a) h(thr) n(ead) e(to) h(wait) h(on) f(the) f(condition) 221
351
3277 y(varia) r(ble.) 45 b(A) 28 b(call) i(to) p Fd 27
352
w(sign) n(al\(\)) p Fg 27 w(wakes) d(up) h(at) g(least) g(one) f(thr) n
353
(ead) h(if) h(any) f(ar) n(e) g(waiting.) 45 b(A) 221
354
3390 y(call) 25 b(to) p Fd 22 w(bro) n(adca) n(st\(\)) p
355
Fg 21 w(wakes) d(up) g(all) i(thr) n(eads) e(waiting) h(on) f(the) g
356
(condition) g(varia) r(ble.) 362 3503 y(When) 30 b(constr) o(ucte) n
357
(d,) i(a) e(pointer) f(to) h(an) p Fd 30 w(omni) n(_mute) n(x) p
358
Fg 30 w(must) f(be) h(given.) 50 b(A) 30 b(condition) 221
359
3616 y(varia) r(ble) p Fd 33 w(wait\() n(\)) p Fg 33
360
w(has) j(an) h(implic) r(it) f(mutex) p Fd 33 w(unlo) n(ck\(\)) p
361
Fg 32 w(and) p Fd 33 w(lock) n(\(\)) p Fg 33 w(ar) n(ound) g(it.) 60
362
b(The) 221 3729 y(link) 30 b(between) f(condition) g(varia) r(ble) h
363
(and) g(mutex) f(lasts) g(for) h(the) f(lifetime) i(of) e(the) g
364
(condition) 221 3842 y(varia) r(ble) c(\(unlike) h(pthr) n(eads) e
365
(wher) n(e) g(the) h(link) h(is) f(only) g(for) g(the) g(duration) f
366
(of) i(the) e(wait\).) 37 b(The) 221 3955 y(same) 23
367
b(mutex) f(may) h(be) f(used) f(with) i(several) f(condition) h(variab)
368
r(les.) 362 4068 y(A) c(wait) g(with) g(a) g(timeout) f(can) i(be) e
369
(achieved) h(by) g(call) r(ing) p Fd 19 w(tim) n(ed_w) n(ait\(\)) p
370
Fg -2 w(.) 27 b(This) 18 b(is) h(given) 221 4181 y(an) 27
371
b(absolute) e(time) h(to) f(wait) h(until.) 38 b(The) 26
372
b(r) n(outine) p Fd 25 w(omn) n(i_thr) n(ead:) n(:get_) n(time) n(\(\))
373
p Fg 25 w(can) h(be) 221 4293 y(used) 21 b(to) h(turn) g(a) h(r) n
374
(elativ) r(e) f(time) g(into) h(an) g(absolute) f(time.) p
375
Fd 28 w(tim) n(ed_wa) n(it\(\)) p Fg 21 w(r) n(eturns) p
376
Fd 21 w(true) p Fg 21 w(if) 221 4406 y(the) 27 b(condition) h(was) g
377
(signalled,) p Fd 29 w(false) p Fg 26 w(if) h(the) f(time) g(expir) n
378
(ed) f(befor) n(e) g(the) h(condition) f(vari) r(-) 221
379
4519 y(able) d(was) e(signalled.) p Fc 221 4774 a(2.3) 99
380
b(Counting) 26 b(semaphores) p Fg 221 4951 a(An) p Fd
381
21 w(omn) n(i_sem) n(apho) n(re) p Fg 20 w(is) 21 b(a) h(counting) e
382
(semaphor) n(e) n(.) 28 b(When) 20 b(cr) n(eated) g(it) h(is) g(given) g
383
(an) g(initial) 221 5064 y(unsigned) j(intege) n(r) i(value.) 36
384
b(When) p Fd 25 w(wai) n(t\(\)) p Fg 24 w(is) 26 b(called,) g(the) f
385
(value) h(is) f(decr) n(emente) n(d) g(if) h(non-) 221
386
5177 y(zer) n(o.) 43 b(If) 27 b(the) g(value) h(is) f(zer) n(o) h(then)
387
f(the) f(thr) n(ead) h(blocks) h(instead.) 41 b(When) p
388
Fd 27 w(post) n(\(\)) p Fg 27 w(is) 27 b(cal) r(led,) 221
389
5290 y(if) h(any) g(thr) n(eads) e(ar) n(e) i(blocked) f(in) p
390
Fd 27 w(wait\() n(\)) p Fg(,) h(exactly) f(one) g(thr) n(ead) g(is) g
391
(woken.) 41 b(If) 27 b(no) g(thr) n(eads) 221 5403 y(wer) n(e) 22
392
b(blocked) g(then) g(the) g(value) h(of) g(the) e(semaphor) n(e) h(is) h
393
(incr) n(emented.) p 90 rotate dyy eop
395
3 2 bop Fg 3306 249 a(3) 204 548 y(If) 27 b(a) h(thr) n(ead) e(cal) r
396
(ls) p Fd 27 w(try) n(_wait) n(\(\)) p Fg(,) h(then) g(the) f(thr) n
397
(ead) g(won't) h(block) h(if) f(the) g(semaphor) n(e's) 63
398
661 y(value) c(is) g(0,) g(r) n(eturning) p Fd 21 w(false) p
399
Fg 21 w(instead.) 204 777 y(Ther) n(e) f(is) g(no) h(way) f(of) h
400
(query) n(ing) g(the) f(value) h(of) g(the) f(semaphor) n(e) n(.) p
401
Fh 63 1095 a(3) 119 b(Thread) 29 b(object) p Fg 63 1313
402
a(A) 23 b(thr) n(ead) g(is) h(r) n(epr) n(ese) n(nted) e(by) i(an) p
403
Fd 24 w(omni) n(_thr) n(ead) p Fg 23 w(object.) 30 b(Ther) n(e) 23
404
b(ar) n(e) h(br) n(oadly) g(two) e(dif) n(fer) n(-) 63
405
1426 y(ent) f(ways) i(in) g(which) g(it) g(can) g(be) g(used) n(.) 204
406
1542 y(The) 28 b(\002rst) g(way) h(is) h(simply) f(to) f(cr) n(eate) h
407
(an) p Fd 30 w(omn) n(i_thr) n(ead) p Fg 28 w(object,) h(giving) g(a) f
408
(particula) r(r) 63 1655 y(function) c(which) h(the) e(thr) n(ead) h
409
(should) f(execute) n(.) 36 b(This) 25 b(is) g(like) g(the) g(POSIX) f
410
(\(or) i(any) f(other) n(\)) h(C) 63 1768 y(language) c(interface.) 204
411
1884 y(The) k(second) f(method) h(of) h(use) e(is) i(to) f(cr) n(eate) h
412
(a) g(new) g(class) g(which) g(inherits) f(fr) n(om) p
413
Fd 28 w(omn) n(i_) 63 1997 y(thr) n(ead) p Fg(.) 50 b(In) 31
414
b(this) f(case) g(the) g(thr) n(ead) g(will) i(execute) d(the) p
415
Fd 29 w(run\(\)) p Fg 29 w(member) h(function) h(of) f(the) 63
416
2109 y(new) 22 b(class.) 29 b(One) 23 b(advantage) g(of) g(this) g
417
(scheme) f(is) h(that) g(thr) n(ead-speci\002c) g(data) g(can) h(be) f
418
(imple-) 63 2222 y(mented) e(simply) h(by) h(having) g(data) g(members)
419
f(of) h(the) f(new) g(class.) 204 2339 y(When) f(constr) o(ucted) g(a) i
420
(thr) n(ead) f(is) g(in) h(the) e("new") h(state) f(and) h(has) g(not) g
421
(actuall) r(y) g(starte) n(d.) 28 b(A) 63 2451 y(call) j(to) p
422
Fd 29 w(sta) n(rt\(\)) p Fg 28 w(causes) e(the) g(thr) n(ead) g(to) g
423
(begin) g(executing.) 47 b(A) 29 b(static) h(member) f(function) p
424
Fd 63 2564 a(cre) n(ate\() n(\)) p Fg 32 w(is) j(pr) n(ovided) f(to) g
425
(constr) o(uct) g(and) g(start) g(a) i(thr) n(ead) e(in) h(a) g(single)
426
g(call.) 57 b(A) 31 b(thr) n(ead) 63 2677 y(exits) 21
427
b(by) i(call) r(ing) p Fd 22 w(exit\() n(\)) p Fg 22
428
w(or) g(by) f(r) n(eturning) g(fr) n(om) h(the) f(thr) n(ead) g
429
(function.) 204 2793 y(Thr) n(eads) 27 b(can) j(be) e(either) g
430
(detached) f(or) h(undetached) n(.) 46 b(Detached) 28
431
b(thr) n(eads) g(ar) n(e) h(thr) n(eads) 63 2906 y(for) h(which) i(all)
432
g(state) e(will) i(be) f(lost) f(upon) g(exit.) 52 b(Other) 30
433
b(thr) n(eads) g(cannot) h(dete) n(rmine) g(when) 63
434
3019 y(a) e(detached) f(thr) n(ead) h(will) h(disappear) -7
435
b(,) 31 b(and) e(ther) n(efor) n(e) f(should) g(not) h(attempt) f(to) g
436
(access) h(the) 63 3132 y(thr) n(ead) 23 b(object) g(unless) f(some) h
437
(explicit) h(synchr) n(onisation) f(with) g(the) g(detached) f(thr) n
438
(ead) h(guar) n(-) 63 3245 y(antees) e(that) h(it) h(still) g(exists.)
439
204 3361 y(Undet) n(ached) 33 b(thr) n(eads) f(ar) n(e) i(thr) n(eads) e
440
(for) h(which) g(storage) f(is) h(not) f(r) n(eclai) r(med) g(until) i
441
(an-) 63 3474 y(othe) n(r) g(thr) n(ead) g(waits) g(for) g(its) g
442
(termination) g(by) g(call) r(ing) p Fd 34 w(joi) n(n\(\)) p
443
Fg(.) 61 b(An) 34 b(exit) g(value) h(can) g(be) 63 3587
444
y(passe) n(d) 23 b(fr) n(om) g(an) g(undet) n(ached) g(thr) n(ead) f
445
(to) g(the) g(thr) n(ead) g(which) h(joins) g(it.) 204
446
3703 y(Detached) 31 b(/) h(undetached) e(thr) n(eads) h(ar) n(e) i
447
(distinguish) n(ed) f(on) f(cr) n(eation) h(by) g(the) f(type) g(of) 63
448
3816 y(function) 24 b(they) e(execute.) 30 b(Undetached) 22
449
b(thr) n(eads) h(execute) g(a) h(function) g(which) g(has) g(a) p
450
Fd 25 w(voi) n(d*) p Fg 63 3929 a(r) n(eturn) c(typ) n(e,) h(wher) n
451
(eas) f(detached) f(thr) n(eads) h(execute) f(a) j(function) f(which) g
452
(has) g(a) p Fd 21 w(void) p Fg 19 w(r) n(eturn) 63 4042
453
y(typ) n(e.) 52 b(Unfortunate) n(ly) 31 b(C++) g(member) g(functions) f
454
(ar) n(e) h(not) f(allowed) g(to) g(be) h(distingu) n(ished) 63
455
4155 y(simply) 26 b(by) h(their) f(r) n(eturn) g(type) n(.) 40
456
b(Thus) 26 b(in) h(the) f(case) h(of) g(a) g(derived) f(class) h(of) p
457
Fd 26 w(omni_) n(thre) n(ad) p Fg 63 4268 a(which) 20
458
b(needs) e(an) j(undet) n(ached) f(thr) n(ead,) g(the) f(member) h
459
(function) g(execute) n(d) g(by) g(the) f(thr) n(ead) g(is) 63
460
4380 y(called) p Fd 19 w(run_u) n(ndet) n(ache) n(d\(\)) p
461
Fg 18 w(rather) f(than) p Fd 19 w(run\() n(\)) p Fg(,) h(and) g(it) g
462
(is) g(started) e(by) i(calli) r(ng) p Fd 18 w(star) n(t_) 63
463
4493 y(und) n(etac) n(hed\(\)) p Fg 21 w(instead) j(of) p
464
Fd 22 w(start) n(\(\)) p Fg(.) 204 4610 y(The) i(abstraction) i(curr) n
465
(ently) e(suppo) n(rts) h(thr) n(ee) f(priorities) g(of) h(thr) n(ead,)
466
g(but) g(no) g(guarantee) 63 4722 y(is) 33 b(made) g(of) h(how) f(this)
467
g(will) h(af) n(f) r(ect) f(underlying) f(thr) n(ead) h(scheduling.) 59
468
b(The) 33 b(thr) n(ee) f(priori-) 63 4835 y(ties) 18
469
b(ar) n(e) p Fd 20 w(PRIO) n(RITY) n(_LOW) p Fg(,) p
470
Fd 18 w(PRIO) n(RITY) n(_NOR) n(MAL) p Fg 19 w(and) p
471
Fd 19 w(PRIO) n(RITY) n(_HIG) n(H) p Fg(.) h(By) g(default) g(all) 63
472
4948 y(thr) n(eads) i(r) o(un) i(at) p Fd 23 w(PRIO) n(RITY) n(_NORM) n
473
(AL) p Fg(.) f(A) g(dif) n(fer) n(ent) h(priority) f(can) i(be) e
474
(speci\002ed) g(on) g(thr) n(ead) 63 5061 y(cr) n(eation,) h(or) f
475
(while) h(the) f(thr) n(ead) g(is) h(r) o(unning) g(using) p
476
Fd 22 w(set_) n(prio) n(rity\() n(\).) p Fg 28 w(A) g(thr) n(ead's) f
477
(cur) n(-) 63 5174 y(r) n(ent) g(priority) g(is) g(r) n(eturned) f(by) p
478
Fd 23 w(pri) n(ority) n(\(\)) p Fg(.) 204 5290 y(Other) d(functions) g
479
(pr) n(ovided) g(ar) n(e) p Fd 19 w(sel) n(f\(\)) p Fg
480
18 w(which) h(r) n(eturns) e(the) h(calli) r(ng) g(thr) n(ead's) p
481
Fd 18 w(omn) n(i_) 63 5403 y(thr) n(ead) p Fg 36 w(object,) p
482
Fd 40 w(yie) n(ld\(\)) p Fg 35 w(which) 38 b(r) n(eques) n(ts) e(that) h
483
(other) e(thr) n(eads) h(be) h(allowed) g(to) f(r) o(un,) p
486
4 3 bop Fg 221 249 a(4) p Fe 1367 w(6) 91 b(THRE) n(ADED) 23
487
b(I/O) g(SHUTDOWN) f(FOR) g(UNIX) p Fd 221 548 a(id\(\)) p
488
Fg 27 w(which) 29 b(r) n(eturns) e(an) i(intege) n(r) g(id) f(for) h
489
(the) e(thr) n(ead) h(for) g(use) g(in) h(debug) n(ging,) p
490
Fd 29 w(state) n(\(\)) p Fg(,) p Fd 221 661 a(slee) n(p\(\)) p
491
Fg 22 w(and) p Fd 22 w(get_t) n(ime\() n(\)) p Fg(.) p
492
Fh 221 953 a(4) 119 b(Per) n(-threa) n(d) 30 b(data) p
493
Fg 221 1164 a(omnithr) n(ead) 22 b(suppo) n(rts) g(per) n(-thr) n(ead) f
494
(data,) h(via) i(member) e(functions) f(of) i(the) p
495
Fd 21 w(omni) n(_thr) n(ead) p Fg 221 1277 a(object.) 362
496
1390 y(First,) d(you) g(must) h(allocate) h(a) f(key) f(for) g(with) h
497
(the) p Fd 20 w(omni) n(_thre) n(ad::) n(allo) n(cate_) n(key\() n(\)) p
498
Fg 221 1502 a(function.) 28 b(Then,) 21 b(any) h(object) g(whose) f
499
(class) h(is) g(derived) f(fr) n(om) p Fd 23 w(omni) n(_thr) n(ead::) n
500
(valu) n(e_t) p Fg 221 1615 a(can) 27 b(be) f(stor) n(e) n(d) g(using) f
501
(the) p Fd 26 w(set) n(_val) n(ue\(\)) p Fg 25 w(function.) 38
502
b(V) -8 b(alues) 25 b(ar) n(e) h(r) n(etrieved) f(or) h(r) n(emoved) 221
503
1728 y(with) p Fd 23 w(get) n(_valu) n(e\(\)) p Fg 21
504
w(and) p Fd 23 w(remo) n(ve_v) n(alue\() n(\)) p Fg 22
505
w(r) n(espectively) -10 b(.) 362 1841 y(When) 23 b(the) g(thr) n(ead) g
506
(exits,) g(all) i(per) n(-thr) n(ead) e(data) h(is) g(delet) n(ed) f
507
(\(hence) h(the) e(base) i(class) g(with) 221 1954 y(virtual) g(dest) n
508
(r) o(uctor\).) 362 2067 y(Note) 17 b(that) i(the) f(per) n(-thr) n
509
(ead) f(data) i(functions) f(ar) n(e) p Fb 19 w(not) p
510
Fg 18 w(thr) n(ead) g(safe,) i(so) d(although) i(you) e(can) 221
511
2180 y(access) 29 b(one) e(thr) n(ead's) h(storage) f(fr) n(om) i
512
(another) f(thr) n(ead,) h(ther) n(e) e(is) i(no) f(concurr) n(ency) g
513
(contr) n(ol.) 221 2293 y(Unless) j(you) g(r) n(eall) r(y) h(know) f
514
(what) h(you) f(ar) n(e) i(doing,) g(it) g(is) f(best) f(to) h(only) g
515
(access) g(per) n(-thr) n(ead) 221 2406 y(data) 23 b(fr) n(om) g(the) f
516
(thr) n(ead) g(it) h(is) g(attached) f(to.) p Fh 221
517
2698 a(5) 119 b(Using) 31 b(OMNI) d(threads) h(in) h(your) g(program) p
518
Fg 221 2909 a(Obvi) r(ously) 16 b(you) h(need) g(to) g(include) h(the) p
519
Fd 16 w(omnit) n(hrea) n(d.h) p Fg 17 w(header) e(\002le) i(in) g(your)
520
f(sour) n(ce) g(code,) 221 3021 y(and) 25 b(link) g(in) h(the) e
521
(omnithr) n(ead) g(libra) r(ry) g(with) h(your) f(execut) n(abl) r(e.)
522
34 b(Because) 23 b(ther) n(e) h(is) h(a) g(single) p
523
Fd 221 3134 a(omni) n(threa) n(d.h) p Fg 30 w(for) 32
524
b(all) h(platforms,) h(certain) e(pr) n(epr) n(oces) n(sor) f
525
(de\002nes) f(must) h(be) g(given) h(as) 221 3247 y(compiler) 25
526
b(options) n(.) 33 b(The) 23 b(easiest) g(way) h(to) g(do) f(this) h
527
(is) g(to) g(stud) n(y) g(the) g(make\002les) f(given) h(in) h(the) 221
528
3360 y(examples) i(pr) n(ovided) g(with) g(this) g(distribution.) 42
529
b(If) 27 b(you) g(ar) n(e) g(to) g(include) h(OMNI) f(thr) n(eads) g
530
(in) 221 3473 y(your) 18 b(own) g(development) g(envir) n(onment,) h
531
(thes) n(e) g(ar) n(e) g(the) f(necessary) g(pr) n(epr) n(oce) n(ssor) g
532
(de\002nes) n(:) p 362 3567 3287 4 v 360 3680 4 113 v
533
412 3646 a(Platform) p 1312 3680 V 599 w(Pr) n(epr) n(ocess) n(or) 23
534
b(De\002nes) p 3648 3680 V 362 3683 3287 4 v 362 3700
535
V 360 3813 4 113 v 412 3779 a(Sun) f(Solaris) h(2.x) p
536
1312 3813 V Fd 365 w(-D__) n(suno) n(s__) 54 b(-D_) n(_spa) n(rc__) f
537
(-D__) n(OSVER) n(SION) n(__=5) p 3648 3813 V 360 3926
538
V 1312 3926 V 1363 3892 a(-DSV) n(R4) h(-DUs) n(ePth) n(read) f(-D_R) n
539
(EENT) n(RANT) p 3648 3926 V 362 3929 3287 4 v 360 4042
540
4 113 v Fg 412 4008 a(x86) 24 b(Linux) e(2.0) p 1312
541
4042 V Fd 418 w(-D__) n(linu) n(x__) 54 b(-D_) n(_i86) n(__) g(-D__) n
542
(OSVE) n(RSION) n(__=2) p 3648 4042 V 360 4155 V Fg 412
543
4121 a(with) 23 b(linuxthr) n(eads) f(0.5) p 1312 4155
544
V Fd 100 w(-D_R) n(EENT) n(RANT) p 3648 4155 V 362 4158
545
3287 4 v 360 4271 4 113 v Fg 412 4237 a(Digital) i(Unix) f(3.2) p
546
1312 4271 V Fd 320 w(-D__) n(osf1) n(__) 54 b(-D__) n(alph) n(a__) g
547
(-D_) n(_OSV) n(ERSIO) n(N__=) n(3) p 3648 4271 V 360
548
4384 V 1312 4384 V 1363 4350 a(-D_R) n(EENT) n(RANT) p
549
3648 4384 V 362 4387 3287 4 v 360 4500 4 113 v Fg 412
550
4466 a(W) -5 b(indows) 22 b(NT) p 1312 4500 V Fd 411
551
w(-D__) n(NT__) 53 b(-MD) p 3648 4500 V 362 4503 3287
552
4 v Fh 221 4740 a(6) 119 b(Threaded) 29 b(I/O) g(shutdown) h(for) g
553
(Unix) p Fg 221 4951 a(or) -7 b(,) 20 b(how) e(one) g(thr) n(ead) h
554
(shou) n(ld) h(tell) f(another) f(thr) n(ead) g(to) h(shut) f(down) g
555
(when) g(it) h(might) g(be) g(doing) 221 5064 y(a) k(blocking) g(cal) r
556
(l) g(on) f(a) h(socket) n(.) p Fb 362 5177 a(If) h(you) e(are) i
557
(using) e(omniOR) n(B,) h(you) e(don') n(t) i(need) g(to) g(worry) f
558
(about) g(all) i(this,) f(since) h(om-) 221 5290 y(niORB) i(does) h(it)
559
h(for) f(you) n(.) p Fg 41 w(This) g(section) f(is) h(only) g(r) n
560
(elevant) g(if) h(you) e(ar) n(e) h(using) f(omnithr) n(ead) 221
561
5403 y(in) d(your) f(own) g(socket) n(-based) h(pr) n(ogramming.) k(It)
562
22 b(is) h(also) g(serious) n(ly) g(out) f(of) h(date.) p
565
5 4 bop Fe 63 249 a(6.1) 91 b(r) n(ead\(\)) p Fg 2800
566
w(5) 204 548 y(Unfortunate) n(ly) 35 b(ther) n(e) e(doe) n(sn't) h
567
(seem) f(to) h(be) g(a) h(standar) n(d) e(way) i(of) f(doing) f(this) h
568
(which) 63 661 y(works) 19 b(acr) n(oss) i(all) i(Unix) e(syst) n(ems.)
569
27 b(I) 21 b(have) g(investigated) f(the) h(behaviour) g(of) g(Solaris)
570
h(2.5) g(and) 63 774 y(Digital) k(Unix) g(3.2.) 36 b(On) 26
571
b(Digital) h(Unix) e(everyth) n(ing) h(is) f(\002ne,) g(as) h(the) e
572
(obvious) h(method) f(using) 63 887 y(shutd) n(own\(\)) 32
573
b(seems) f(to) h(work) f(OK.) h(Unfortunately) f(on) h(Solaris) h(shut)
574
n(down) f(can) h(only) f(be) 63 1000 y(used) 25 b(on) h(a) h(connected)
575
e(socke) n(t,) i(so) f(we) g(need) f(devious) h(means) g(to) g(get) f
576
(ar) n(ound) h(this) g(lim) r(ita-) 63 1112 y(tion.) h(The) 22
577
b(details) g(ar) n(e) h(summarised) g(below:) p Fc 63
578
1429 a(6.1) 99 b(read\(\)) p Fg 63 1627 a(Thr) n(ead) 28
579
b(A) h(is) g(in) h(a) g(loop,) g(doing) p Fd 28 w(rea) n(d\(soc) n(k\))
580
p Fg(,) g(pr) n(ocess) n(ing) f(the) g(data,) h(then) f(going) f(back)
581
63 1739 y(into) 22 b(the) g(r) n(ead.) 204 1862 y(Thr) n(ead) 30
582
b(B) h(comes) f(along) h(and) g(wants) f(to) g(shut) g(it) h(down) f
583
(\227) h(it) g(can't) g(cancel) h(thr) n(ead) f(A) 63
584
1975 y(since) 21 b(\(i\)) h(working) e(out) g(how) g(to) h(clean) h(up)
585
e(accor) n(ding) i(to) e(wher) n(e) g(A) h(is) g(in) h(its) f(loop) f
586
(is) h(a) h(night-) 63 2088 y(mar) n(e,) h(and) f(\(ii\)) i(this) f
587
(isn't) f(ava) r(ilabl) r(e) g(in) h(omnithr) n(ead) f(anyway) -10
588
b(.) 204 2211 y(On) 23 b(Solaris) g(2.5) g(and) g(Digital) h(Unix) f
589
(3.2) g(the) f(following) h(strate) n(gy) f(works:) 204
590
2334 y(Thr) n(ead) g(B) g(does) p Fd 21 w(shut) n(down\() n(sock) n
591
(,2\)) p Fg(.) 204 2457 y(At) g(this) g(point) h(thr) n(ead) f(A) g(is)
592
h(either) f(blocked) g(inside) p Fd 23 w(rea) n(d\(so) n(ck\)) p
593
Fg(,) g(or) g(is) h(elsewhe) n(r) n(e) g(in) 63 2570
594
y(the) 18 b(loop.) 26 b(If) 18 b(the) g(former) h(then) f(r) n(ead) h
595
(will) h(r) n(eturn) e(0,) i(indicating) f(that) g(the) f(socke) n(t) h
596
(is) g(closed.) 26 b(If) 63 2683 y(the) 21 b(latter) h(then) f
597
(eventually) h(thr) n(ead) g(A) g(will) i(call) p Fd
598
24 w(rea) n(d\(so) n(ck\)) p Fg 21 w(and) f(then) e(this) h(will) h(r) n
599
(eturn) 63 2796 y(0.) 28 b(Thr) n(ead) 22 b(A) h(should) p
600
Fd 21 w(clos) n(e\(soc) n(k\)) p Fg(,) f(do) g(any) g(other) g(tidying)
601
f(up,) h(and) h(exit.) 204 2919 y(If) 34 b(ther) n(e) g(is) h(another) f
602
(point) g(in) h(the) e(loop) i(that) f(thr) n(ead) g(A) h(can) g(block)
603
g(then) f(obviously) 63 3032 y(thr) n(ead) 19 b(B) h(needs) f(to) h(be)
604
g(awar) n(e) h(of) f(this) g(and) g(be) h(able) g(to) e(wake) h(it) h
605
(up) f(in) g(the) g(appr) n(opriate) g(way) 63 3145 y(fr) n(om) j(that)
606
f(point.) p Fc 63 3462 a(6.2) 99 b(accept\(\)) p Fg 63
607
3659 a(Again) 25 b(thr) n(ead) g(A) h(is) f(in) h(a) g(loop,) g(this) f
608
(time) h(doing) e(an) i(acc) r(ept) e(on) h(listenSock,) g(dealing) h
609
(with) 63 3772 y(a) d(new) f(connection) g(and) h(going) e(back) j
610
(into) e(accept.) 28 b(Thr) n(ead) 22 b(B) g(wants) h(to) f(cancel) h
611
(it.) 204 3895 y(On) g(Digital) h(Unix) f(3.2) g(the) f(strateg) n(y) g
612
(is) h(identical) h(to) e(that) g(for) h(r) n(ead:) 204
613
4018 y(Thr) n(ead) 39 b(B) g(does) p Fd 38 w(shut) n(down) n(\(list) n
614
(enSo) n(ck,2) n(\)) p Fg(.) 79 b(Wher) n(ever) 38 b(thr) n(ead) h(A) h
615
(is) f(in) h(the) 63 4131 y(loop,) i(eventually) c(it) h(will) h(r) n
616
(eturn) p Fd 38 w(ECONN) n(ABOR) n(TED) p Fg 38 w(fr) n(om) f(the) f
617
(accept) h(call) r(.) 76 b(It) 39 b(shou) n(ld) p Fd
618
63 4244 a(clo) n(se\(l) n(isten) n(Sock) n(\)) p Fg(,) 22
619
b(tidy) g(up) g(as) h(necessary) e(and) i(exit.) 204
620
4367 y(On) 30 b(Solaris) f(2.5) i(thr) n(ead) e(B) g(can't) h(do) p
621
Fd 29 w(shu) n(tdow) n(n\(lis) n(tenS) n(ock,2) n(\)) p
622
Fg 29 w(\227) g(this) f(r) n(eturns) p Fd 63 4480 a(ENO) n(TCON) n(N) p
623
Fg(.) 22 b(Instead) f(the) h(following) h(strateg) n(y) g(can) g(be) g
624
(used) n(:) 204 4603 y(First) 35 b(thr) n(ead) h(B) g(set) n(s) g(some)
625
f(sort) g(of) h("shutdo) n(wn) g(\003ag") g(associated) g(with) g
626
(listenSock.) 63 4716 y(Then) 31 b(it) h(does) p Fd 30
627
w(gets) n(ocka) n(ddr\(l) n(iste) n(nSock) n(\)) p Fg
628
32 w(to) f(\002nd) g(out) g(which) i(port) e(listenSock) f(is) 63
629
4828 y(on) 18 b(\(or) h(knows) e(alr) n(eady\),) j(sets) d(up) h(a) h
630
(socket) e(dummySock,) i(doe) n(s) p Fd 19 w(con) n(nect) n(\(dumm) n
631
(ySoc) n(k,) 63 4941 y(thi) n(s) 54 b(host,) f(por) n(t\)) p
632
Fg 22 w(and) 23 b(\002nally) g(does) p Fd 21 w(clos) n(e\(dum) n(mySo) n
633
(ck\)) p Fg(.) 204 5064 y(Wher) n(ever) 16 b(thr) n(ead) h(A) g(is) g
634
(in) h(the) e(loop,) h(eventually) g(it) h(will) g(call) p
635
Fd 19 w(acce) n(pt\(li) n(sten) n(Sock) n(\)) p Fg(.) 63
636
5177 y(This) 35 b(will) j(r) n(eturn) d(successfully) g(with) h(a) h
637
(new) e(socket,) j(say) e(connSock.) 67 b(Thr) n(ead) 36
638
b(A) f(then) 63 5290 y(checks) 20 b(to) h(see) f(if) i(the) f("shutd) n
639
(own) g(\003ag") h(is) f(set.) 26 b(If) c(not,) e(then) h(it's) g(a) h
640
(normal) g(connection.) 27 b(If) 21 b(it) 63 5403 y(is) h(set,) g(then)
641
f(thr) n(ead) h(A) h(closes) f(listenSock) f(and) i(connSock,) e
642
(tidies) h(up) g(and) h(exits.) p 90 rotate dyy eop
644
6 5 bop Fg 221 249 a(6) p Fe 1367 w(6) 91 b(THRE) n(ADED) 23
645
b(I/O) g(SHUTDOWN) f(FOR) g(UNIX) p Fc 221 548 a(6.3) 99
646
b(write\(\)) p Fg 221 768 a(Thr) n(ead) 19 b(A) f(may) h(be) g(blocked)
647
f(in) i(write,) f(or) f(about) h(to) f(go) g(in) h(to) g(a) g(poten) n
648
(tiall) r(y-blocking) g(write.) 221 881 y(Thr) n(ead) j(B) h(wants) f
649
(to) g(shut) f(it) i(down.) 362 1016 y(On) g(Solaris) g(2.5:) 362
650
1150 y(Thr) n(ead) f(B) h(doe) n(s) p Fd 23 w(shu) n(tdown) n(\(soc) n
651
(k,2\)) p Fg -2 w(.) 362 1285 y(If) c(thr) n(ead) f(A) h(is) g(alr) n
652
(eady) g(in) p Fd 20 w(wri) n(te\(s) n(ock\)) p Fg 17
653
w(then) f(it) h(will) i(r) n(eturn) d(with) p Fd 18 w(ENXIO) p
654
Fg -2 w(.) h(If) g(thr) n(ead) 221 1398 y(A) k(calls) h(write) e(after)
655
g(thr) n(ead) g(B) h(calls) h(shut) n(down) e(this) g(will) i(r) n
656
(eturn) p Fd 22 w(EIO) p Fg(.) 362 1532 y(On) f(Digital) h(Unix) f
657
(3.2:) 362 1666 y(Thr) n(ead) f(B) h(doe) n(s) p Fd 23
658
w(shu) n(tdown) n(\(soc) n(k,2\)) p Fg -2 w(.) 362 1801
659
y(If) h(thr) n(ead) f(A) g(is) h(alr) n(eady) g(in) p
660
Fd 24 w(writ) n(e\(so) n(ck\)) p Fg 23 w(then) e(it) i(will) h(r) n
661
(eturn) e(the) f(number) i(of) f(bytes) 221 1914 y(written) 31
662
b(befor) n(e) h(it) g(became) g(blocked.) 55 b(A) 32
663
b(subseq) n(uent) f(cal) r(l) h(to) f(write) h(will) h(then) e(gene) n
664
(rate) p Fd 221 2027 a(SIGP) n(IPE) p Fg 22 w(\(or) p
665
Fd 22 w(EPIP) n(E) p Fg 23 w(will) 24 b(be) e(r) n(eturned) f(if) p
666
Fd 24 w(SIG) n(PIPE) p Fg 21 w(is) i(ignor) n(ed) e(by) i(the) f(thr) n
667
(ead\).) p Fc 221 2413 a(6.4) 99 b(connect\(\)) p Fg
668
221 2634 a(Thr) n(ead) 30 b(A) f(may) h(be) g(blocked) f(in) i
669
(connect,) g(or) e(about) h(to) f(go) g(in) i(to) e(a) h(poten) n
670
(tiall) r(y-blocking) 221 2747 y(connect.) d(Thr) n(ead) c(B) f(wants) g
671
(to) g(shut) g(it) g(down.) 362 2881 y(On) h(Digital) h(Unix) f(3.2:)
672
362 3016 y(Thr) n(ead) f(B) h(doe) n(s) p Fd 23 w(shu) n(tdown) n
673
(\(soc) n(k,2\)) p Fg -2 w(.) 362 3150 y(If) j(thr) n(ead) f(A) g(is) h
674
(alr) n(eady) g(in) p Fd 26 w(conn) n(ect\() n(sock) n(\)) p
675
Fg 26 w(then) e(it) i(will) h(r) n(eturn) e(a) h(successful) f(con-) 221
676
3263 y(nection.) 54 b(Subsequ) n(ent) 31 b(r) n(eading) g(or) g
677
(writing) g(will) i(show) d(that) i(the) e(socket) g(has) h(been) g
678
(shut) 221 3376 y(down) 22 b(\(i.e.) 28 b(r) n(ead) 23
679
b(r) n(eturns) e(0,) i(write) f(generate) n(s) p Fd 23
680
w(SIG) n(PIPE) p Fg 21 w(or) g(r) n(eturns) p Fd 22 w(EPI) n(PE) p
681
Fg(\).) g(If) h(thr) n(ead) f(A) 221 3489 y(call) r(s) g(connect) g
682
(after) h(thr) n(ead) f(B) g(call) r(s) g(shutdo) n(wn) h(this) f(will)
683
i(r) n(eturn) p Fd 22 w(EIN) n(VAL) p Fg(.) 362 3623
684
y(On) f(Solaris) g(2.5:) 362 3758 y(Ther) n(e) 35 b(is) h(no) f(way) g
685
(to) g(wake) g(up) g(a) h(thr) n(ead) f(which) h(is) g(blocked) f(in) h
686
(connect.) 66 b(Inst) n(ead) 221 3871 y(Solaris) 33 b(for) n(ces) g(us)
687
f(thr) n(ough) g(a) i(ridiculous) f(pr) n(oced) n(ur) n(e) g(whichever)
688
g(way) g(we) f(try) g(it.) 59 b(One) 221 3984 y(way) 23
689
b(is) f(this:) 362 4118 y(First) d(thr) n(ead) h(A) g(cr) n(eates) f(a)
690
h(pipe) g(in) g(addition) g(to) f(the) g(socket) n(.) 27
691
b(Instead) 19 b(of) h(shut) n(ting) g(down) 221 4231
692
y(the) i(socket) n(,) h(thr) n(ead) f(B) g(simply) h(writes) e(a) i
693
(byte) f(to) g(the) g(pipe.) 362 4365 y(Thr) n(ead) 17
694
b(A) g(meanwhile) h(set) n(s) f(the) g(socke) n(t) g(to) g
695
(non-blocking) g(mode) f(using) p Fd 17 w(fcn) n(tl\(s) n(ock,) 221
696
4478 y(F_SE) n(TFL,) 53 b(O_NO) n(NBLO) n(CK\)) p Fg(.) 26
697
b(Then) h(it) g(cal) r(ls) g(connect) g(on) g(the) f(socket) g(\227) h
698
(this) g(will) i(r) n(eturn) p Fd 221 4591 a(EINP) n(ROGRE) n(SS) p
699
Fg(.) k(Then) h(it) h(must) e(cal) r(l) p Fd 35 w(sel) n(ect\() n(\)) p
700
Fg(,) k(waiting) e(for) f(either) g(sock) g(to) f(become) 221
701
4704 y(writable) 39 b(or) f(for) h(the) e(pipe) h(to) g(become) g(r) n
702
(eadable.) 75 b(If) 39 b(select) e(r) n(eturns) g(that) i(just) e(sock)
703
h(is) 221 4817 y(writable) 30 b(then) f(the) g(connection) g(has) h
704
(succeede) n(d.) 49 b(It) 29 b(then) g(need) n(s) h(to) f(set) f(the) h
705
(socket) f(back) 221 4930 y(to) i(blocking) h(mode) f(using) p
706
Fd 30 w(fcnt) n(l\(so) n(ck,) 54 b(F_S) n(ETFL) n(,) h(0\)) p
707
Fg(.) c(If) 31 b(instead) e(select) h(r) n(eturns) 221
708
5043 y(that) 23 b(the) e(pipe) h(is) h(r) n(eadable,) g(thr) n(ead) f
709
(A) h(closes) e(the) h(socket) n(,) h(tidies) f(up) g(and) h(exits.) 362
710
5177 y(An) g(alternative) h(method) e(is) i(similar) h(but) e(to) g
711
(use) f(polling) i(instead) e(of) i(the) e(pipe.) 29
712
b(Thr) n(ead) 221 5290 y(B) 24 b(justs) e(sets) g(a) j(\003ag) f(and) g
713
(thr) n(ead) f(A) h(calls) h(select) e(with) g(a) i(timeout,) e(period)
714
n(ica) r(lly) h(waking) f(up) 221 5403 y(to) f(see) g(if) h(the) f
715
(\003ag) h(has) f(been) g(set.) p 90 rotate dyy eop
717
7 6 bop Fe 63 249 a(REF) n(ERENCES) p Fg 2660 w(7) p
718
Fh 63 548 a(Refere) n(nces) p Fg 63 759 a([POSIX94]) p
719
Fa 46 w(Portable) 29 b(Operat) r(ing) f(System) g(Interface) h
720
(\(POSIX\)) e(Thr) n(ea) r(ds) h(Extension) p Fg(,) h(P1003) r(.1c) 245
721
872 y(Draft) 23 b(10,) g(IEEE,) e(Septe) n(mber) i(1994) r(.) 63
722
1059 y([Birr) n(ell89]) p Fa 47 w(An) 28 b(Intr) n(od) r(uction) g(to) h
723
(Pr) n(ogr) r(amming) g(with) g(Thr) n(ead) r(s) p Fg(,) h(Rese) n(ar) n
724
(ch) g(Repo) n(rt) e(35,) j(DEC) 245 1172 y(Syst) n(ems) 22
725
b(Resear) n(ch) g(Center) -7 b(,) 22 b(Palo) h(Alto,) f(CA,) h(January)
726
g(1989) r(.) p 90 rotate dyy eop
729
userdict /end-hook known{end-hook}if
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gnuradio-core/doc/other/omnithread.ps
