chapter 4 -- draft for next meeting (comments/corrections are welcome)

Marc Snir (snir@watson.ibm.com)
Wed, 27 Sep 1995 11:52:17 -0400

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%%Page: 8 8
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%%Page: 10 10
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%%Page: 11 11
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2373 y(describ)q(ed)f(b)o(y)e(an)g(MPI)h(datat)o(yp)q(e)e Fm(no)q(de)p
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y(47)-40 2699 y(48)p eop
%%Page: 12 12
bop 75 -100 a Fv(12)723 b Fn(CHAPTER)15 b(4.)35 b(ONE)16 b(SIDED)f(COMMUNICA)
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272 y(5)1967 328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959
554 y(10)1959 611 y(11)1959 667 y(12)1959 724 y(13)1959 780
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1062 y(19)1959 1119 y(20)1959 1175 y(21)1959 1232 y(22)1959
1288 y(23)1959 1345 y(24)1959 1401 y(25)1959 1457 y(26)1959
1514 y(27)1959 1570 y(28)1959 1627 y(29)1959 1683 y(30)1959
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1966 y(35)1959 2022 y(36)1959 2078 y(37)1959 2135 y(38)1959
2191 y(39)1959 2248 y(40)1959 2304 y(41)1959 2361 y(42)1959
2417 y(43)1959 2474 y(44)1959 2530 y(45)1959 2587 y(46)1959
2643 y(47)1959 2699 y(48)p eop
%%Page: 13 13
bop 75 -100 a Fn(4.4.)34 b(A)o(CCUMULA)l(TE)15 b(FUNCTIONS)1029
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V 16 w(disp,)g(ta)o(rget)p 1743 49 V 16 w(count,)75 106 y(ta)o(rget)p
190 106 V 16 w(datat)o(yp)q(e,)c(op,)e(comm)m(,)d(ta)o(rget)p
728 106 V 16 w(request\))117 183 y Fp(IN)155 b Fm(buf)527 b
Fp(initial)12 b(address)j(of)f(bu\013er)g(\(c)o(hoice\))117
258 y(IN)155 b Fm(count)482 b Fp(n)o(um)o(b)q(er)13 b(of)h(elemen)o(ts)f(in)h
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483 y(IN)155 b Fm(ta)o(rget)p 433 483 V 17 w(disp)384 b Fp(displacemen)o(t)20
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2417 y(43)-40 2474 y(44)-40 2530 y(45)-40 2587 y(46)-40 2643
y(47)-40 2699 y(48)p eop
%%Page: 14 14
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75 2020 y(functions.)166 2076 y(F)l(or)j(example,)i(if)g Fm(op)e
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y(elemen)o(t)16 b(in)g(the)f(target,)f(replacing)i(the)g(former)e(v)m(alue)j
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Fv(applies)i(to)d(elemen)o(ts)h(of)g(the)g(t)o(yp)q(e)g(sp)q(eci\014ed)i(in)e
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2435 y Fq(Discussion:)34 b Fk(MPI)p 511 2435 13 2 v 14 w(PUT)14
b Fp(is)g(a)f(sp)q(ecial)h(case)h(of)f Fk(MPI)p 1045 2435 V
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Fp(\))12 b(=)g Ff(b)p Fp(\).)17 b(If)c(desired,)h(the)g(t)o(w)o(o)f
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b(the)g(windo)o(w)f(m)o(ust)1967 46 y Fl(1)1967 103 y(2)1967
159 y(3)1967 215 y(4)1967 272 y(5)1967 328 y(6)1967 385 y(7)1967
441 y(8)1967 498 y(9)1959 554 y(10)1959 611 y(11)1959 667 y(12)1959
724 y(13)1959 780 y(14)1959 836 y(15)1959 893 y(16)1959 949
y(17)1959 1006 y(18)1959 1062 y(19)1959 1119 y(20)1959 1175
y(21)1959 1232 y(22)1959 1288 y(23)1959 1345 y(24)1959 1401
y(25)1959 1457 y(26)1959 1514 y(27)1959 1570 y(28)1959 1627
y(29)1959 1683 y(30)1959 1740 y(31)1959 1796 y(32)1959 1853
y(33)1959 1909 y(34)1959 1966 y(35)1959 2022 y(36)1959 2078
y(37)1959 2135 y(38)1959 2191 y(39)1959 2248 y(40)1959 2304
y(41)1959 2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530
y(45)1959 2587 y(46)1959 2643 y(47)1959 2699 y(48)p eop
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bop 75 -100 a Fn(4.5.)34 b(COUNTING)16 b(T)l(AR)o(GET)e(REQUEST)947
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162 y(call.)75 367 y Fi(4.4.1)49 b(Example)75 452 y Fv(W)l(e)14
b(w)o(an)o(t)f(to)h(compute)g Fr(B)p Fv(\()p Fr(j)p Fv(\))e(=)644
420 y Fe(P)688 464 y Fd(map)p Fc(\()p Fd(i)p Fc(\)=)p Fd(j)826
452 y Fr(A)p Fv(\()p Fr(i)p Fv(\).)19 b(The)14 b(arra)o(ys)f
Fr(A,)24 b(B)14 b Fv(and)g Fr(map)g Fv(are)g(distributed)i(in)f(the)75
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1399 y Fv(This)17 b(co)q(de)g(is)f(iden)o(tical)j(to)c(the)i(co)q(de)f(in)i
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Fr(map)603 1495 y Fb(\000)p Fd(1)646 1512 y Fv(\),)g(whic)o(h)g(the)g(rev)o
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1568 y(example.\))28 b(In)19 b(a)f(similar)h(manner,)f(w)o(e)g(can)g(replace)
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1625 y(Example)c(1)f(of)g(Section)h(4.3.3,)d(th)o(us)i(p)q(erforming)h(the)f
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y(b)q(et)o(w)o(een)j(an)o(y)e(pair)i(of)f(pro)q(cesses.)75
1824 y Fs(4.5)59 b(Counting)21 b(T)-5 b(a)n(rget)20 b(Request)75
1926 y Fv(This)11 b(section)f(con)o(tains)h(syn)o(tax)e(for)h(a)f(sp)q
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75 2547 y(is)i(necessary)g(to)f(call)i Fm(MPI)p 548 2547 V
16 w(SET)p 647 2547 V 17 w(COUNTER)p 876 2547 V 18 w(THRESHOLD)f
Fv(to)f(reset)h(the)g(threshold)g(or)g(one)g(of)f(the)75 2603
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215 y(4)-32 272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32
498 y(9)-40 554 y(10)-40 611 y(11)-40 667 y(12)-40 724 y(13)-40
780 y(14)-40 836 y(15)-40 893 y(16)-40 949 y(17)-40 1006 y(18)-40
1062 y(19)-40 1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288
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1570 y(28)-40 1627 y(29)-40 1683 y(30)-40 1740 y(31)-40 1796
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245 326 15 2 v 17 w(Set)p 334 326 V 17 w(counter)p 519 326
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413 y(MPI)p 150 413 V 17 w(SET)p 239 413 V 17 w(COUNTER)p 424
413 V 16 w(THRESHOLD\(REQUEST,)d(COUNT,)i(IERROR\))170 469
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Fm(count)h Fv(and)g(activ)m(ate)f(the)g(request.)75 706 y Fm(MPI)p
160 706 14 2 v 16 w(GET)p 264 706 V 17 w(COUNTER)h(\(request,)g(count\))117
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245 983 15 2 v 17 w(Get)p 334 983 V 17 w(counter\(MPI)p 615
983 V 16 w(Request)g(request,)f(int)i(count\))75 1070 y(MPI)p
150 1070 V 17 w(GET)p 239 1070 V 17 w(COUNTER\(REQUEST,)d(COUNT,)i(IERROR\))
170 1126 y(INTEGER)g(REQUEST,)g(COUNT,)g(IERROR)166 1213 y
Fv(Returns)16 b(the)f(curren)o(t)g(v)m(alue)h(from)f(the)g(coun)o(ter)g(asso)
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2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530 y(45)1959
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1337 y(return)g(1;)147 1393 y(})75 1450 y(else)g({)147 1506
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y(IN)155 b Fm(tt)o(yp)q(es)474 b Fp(datat)o(yp)q(e)19 b(of)f(elemen)o(ts)g
(in)g(eac)o(h)i(target)f(bu\013er)g(\(arra)o(y)g(of)905 615
y(handles\))117 690 y(IN)155 b Fm(comm)466 b Fp(comm)o(unicator)11
b(\(handle\))117 765 y(OUT)108 b Fm(o)o(req)506 b Fp(origin)13
b(request)i(\(handle\))75 953 y Fm(V)o(ersion)g(5)75 1039 y
Fv(Finally)l(,)i(w)o(e)d(could)j(giv)o(e)e(up)h(the)f(option)g(of)g(ha)o
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(cess.)75 1190 y Fm(MPI)p 160 1190 V 16 w(IGET)p 277 1190 V
16 w(GA)l(THER\(obuf,)j(count,)f(t)o(yp)q(e,)g(tdisps,)g(comm)n(,)11
b(o)o(req\))117 1267 y Fp(OUT)108 b Fm(obuf)504 b Fp(initial)12
b(address)j(of)f(origin)e(bu\013er)j(\(c)o(hoice\))117 1342
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b Fm(ot)o(yp)q(e)484 b Fp(datat)o(yp)q(e)16 b(of)e(eac)o(h)i(elemen)o(t)f(in)
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1699 y(OUT)108 b Fm(o)o(req)506 b Fp(origin)13 b(request)i(\(handle\))166
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1880 y(put)f(them)g(in)i(bu\013er)e(starting)f(at)h(address)g
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V 16 w(SCA)l(TTER)p Fv(,)75 2144 y(with)g(the)g(same)f(argumen)o(ts,)g(where)
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1335 2201 V 17 w(SCA)l(TTER)p Fv(,)g(with)g(the)f(same)75 2257
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2446 y Fq(Discussion:)34 b Fp(\\Collectiv)o(e")13 b(is)g(misleading)f(here)j
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2496 y(W)m(e)f(still)g(need)i(the)g(use)f(of)g Fk(MPI)p 683
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(ultiple)c(target)j(pro)q(cesses.)1967 46 y Fl(1)1967 103 y(2)1967
159 y(3)1967 215 y(4)1967 272 y(5)1967 328 y(6)1967 385 y(7)1967
441 y(8)1967 498 y(9)1959 554 y(10)1959 611 y(11)1959 667 y(12)1959
724 y(13)1959 780 y(14)1959 836 y(15)1959 893 y(16)1959 949
y(17)1959 1006 y(18)1959 1062 y(19)1959 1119 y(20)1959 1175
y(21)1959 1232 y(22)1959 1288 y(23)1959 1345 y(24)1959 1401
y(25)1959 1457 y(26)1959 1514 y(27)1959 1570 y(28)1959 1627
y(29)1959 1683 y(30)1959 1740 y(31)1959 1796 y(32)1959 1853
y(33)1959 1909 y(34)1959 1966 y(35)1959 2022 y(36)1959 2078
y(37)1959 2135 y(38)1959 2191 y(39)1959 2248 y(40)1959 2304
y(41)1959 2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530
y(45)1959 2587 y(46)1959 2643 y(47)1959 2699 y(48)p eop
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49 y Fs(4.8)59 b(RMW)19 b(op)r(erations)75 151 y Fv(Remote)12
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V 16 w(RMW\()g(inbuf,)h(outbuf,)g(count,)g(datat)o(yp)q(e,)g(dest,)h(disp,)f
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642 y(IN)155 b Fm(count)482 b Fp(n)o(um)o(b)q(er)13 b(of)h(elemen)o(ts)f(in)h
(bu\013ers)h(\(in)o(teger\))117 717 y(IN)155 b Fm(datat)o(yp)q(e)424
b Fp(datat)o(yp)q(e)14 b(of)g(v)n(ariables)f(\(handle\))117
792 y(IN)155 b Fm(ta)o(rget)475 b Fp(rank)14 b(of)f(target)i(pro)q(cess)g
(\(in)o(teger\))117 867 y(IN)155 b Fm(disp)513 b Fp(displacemen)o(t)13
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b Fm(op)541 b Fp(read-mo)q(dify-write)12 b(op)q(eration)i(\(handle\))117
1018 y(IN)155 b Fm(comm)466 b Fp(comm)o(unicator)11 b(\(handle\))75
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1199 y(int)h(target,)f(int)g(disp,)g(MPI)p 993 1199 V 17 w(Op)h(op,)f(MPI)p
1249 1199 V 17 w(Comm)g(comm)g(\))75 1285 y(MPI)p 150 1285
V 17 w(RMW\()g(INBUF,)g(OUTBUF,)g(COUNT,)g(DATATYPE,)g(TARGET,)g(DISP,)g(OP,)
g(COMM,)g(IERROR\))170 1342 y(<type>)g(INBUF,)h(OUTBUF,)170
1398 y(INTEGER)f(DATATYPE,)g(TARGET,)g(DISP,)g(OP,)h(COMM,)f(IERROR)166
1484 y Fv(Accum)o(ulate)17 b(the)e(con)o(ten)o(ts)h(of)f(the)h(input)h
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Fm(count)h Fv(and)75 1541 y Fm(datat)o(yp)q(e)p Fv(,)e(to)e(the)g(target)g
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Fm(dest)i Fv(and)f Fm(comm)m Fv(,)c(at)j(o\013set)g Fm(disp)h
Fv(using)75 1597 y(the)h(op)q(eration)f Fm(op)p Fv(.)20 b(The)15
b(original)g(v)m(alue)h(of)e(the)h(target)e(bu\013er)h(is)h(returned)g(in)g
(the)g(output)f(bu\013er)h(at)75 1654 y(address)g Fm(outbuf)p
Fv(.)166 1710 y(Mo)q(di\014cation)f(of)f(the)h(target)e(bu\013er)i(is)g
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1767 y(bu\013er)i(while)i(the)e(op)q(eration)h(is)f(in)h(progress.)166
1823 y(This)g(call)g(can)f(b)q(e)h(used)g(to)e(implemen)o(t)i(test)f(and)g
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Fm(MPI)p 1572 1823 V 16 w(MAX)p Fv(,)h(test)g(and)75 1880 y(or)g(with)g
Fm(MPI)p 319 1880 V 16 w(BOR)h Fv(and)g(fetc)o(h)f(and)g(add)h(with)f
Fm(MPI)p 1005 1880 V 16 w(SUM)p Fv(.)166 1936 y(Additional)f(op)q(erations)e
(for)f(sw)o(ap)g(and)h(compare&sw)o(ap)f(are)h(prede\014ned.)20
b(The)12 b(sw)o(ap)g(op)q(eration)75 1993 y(is)22 b(the)g Fk(MPI)p
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Fv(\))22 b(=)i Fa(b)p Fv(.)39 b(A)75 2049 y(Read)p 179 2049
14 2 v 17 w(Mo)q(dify)p 337 2049 V 17 w(W)l(rite)13 b(with)h
Fk(MPI)p 654 2049 13 2 v 14 w(LAST)g Fv(stores)e(in)i(the)f(target)f
(bu\013er)i(the)f(v)m(alue)h(in)g Fm(inbuf)h Fv(and)e(returns)75
2105 y(the)k(previous)g(v)m(alue)h(of)e(the)h(target)e(bu\013er)i(in)g
Fm(outbuf)p Fv(.)26 b(The)16 b(compare&sw)o(ap)h(op)q(eration)f(is)i
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2286 y Fa(>;)g(b)p Fv(\))j(=)553 2214 y Fe(\()607 2258 y Fa(a)631
2265 y Fc(2)691 2258 y Fv(if)16 b Fa(a)757 2265 y Fc(1)788
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Fv(\))-32 46 y Fl(1)-32 103 y(2)-32 159 y(3)-32 215 y(4)-32
272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40
554 y(10)-40 611 y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40
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1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40 1345
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2135 y(38)-40 2191 y(39)-40 2248 y(40)-40 2304 y(41)-40 2361
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2643 y(47)-40 2699 y(48)p eop
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bop 75 -100 a Fv(26)723 b Fn(CHAPTER)15 b(4.)35 b(ONE)16 b(SIDED)f(COMMUNICA)
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b(nonasso)q(ciativ)o(e)h(op)q(erations)f(in)h(reduce)h(ma)o(y)c(ha)o(v)o(e)j
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561 y(allo)o(w)12 b(a)i(nonasso)q(ciativ)o(e)g(op)q(eration)f(as)h(argumen)o
(t)f(to)h Fk(MPI)p 1041 561 13 2 v 14 w(OP)p 1113 561 V 14
w(CREA)m(TE)p Fp(,)e(but)i(sp)q(ecify)h(that)f(the)g(outcome)f(is)75
617 y(unde\014ned)i(if)e(suc)o(h)h(op)q(eration)f(is)h(used)g(in)f(a)h
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V 15 w(OP)p 463 674 V 14 w(CREA)m(TE)p Fp(,)e(so)j(as)g(to)f(ha)o(v)o(e)g
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b(of)f(output)g(bu\013er)h(\(c)o(hoice\))117 1191 y(IN)155
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1642 y(OUT)108 b Fm(request)452 b Fp(request)16 b(ob)r(ject)e(\(handle\))75
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1879 y(*request)g(\))75 1966 y(MPI)p 150 1966 V 17 w(IRMW\()g(INBUF,)g
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2022 y(IERROR\))170 2079 y(<type>)g(INVBUF,)g(OUTBUF,)170 2135
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611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
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1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
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2699 y(48)p eop
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2339 y(the)f(target)f(b)q(efore)i(the)f(fence)h(call)g(returns.)166
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103 y(2)-32 159 y(3)-32 215 y(4)-32 272 y(5)-32 328 y(6)-32
385 y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40 611 y(11)-40
667 y(12)-40 724 y(13)-40 780 y(14)-40 836 y(15)-40 893 y(16)-40
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y(48)p eop
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482 y(to)e(implemen)o(t)j(them)e(as)g(sw)o(ap)f(RMC)h(calls,)h(or)f
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y Fl(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967
328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959
611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
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1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
1345 y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959
1570 y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959
1796 y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959
2022 y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959
2248 y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959
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2699 y(48)p eop
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215 y(4)1967 272 y(5)1967 328 y(6)1967 385 y(7)1967 441 y(8)1967
498 y(9)1959 554 y(10)1959 611 y(11)1959 667 y(12)1959 724
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1006 y(18)1959 1062 y(19)1959 1119 y(20)1959 1175 y(21)1959
1232 y(22)1959 1288 y(23)1959 1345 y(24)1959 1401 y(25)1959
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1683 y(30)1959 1740 y(31)1959 1796 y(32)1959 1853 y(33)1959
1909 y(34)1959 1966 y(35)1959 2022 y(36)1959 2078 y(37)1959
2135 y(38)1959 2191 y(39)1959 2248 y(40)1959 2304 y(41)1959
2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530 y(45)1959
2587 y(46)1959 2643 y(47)1959 2699 y(48)p eop
%%Trailer
end
userdict /end-hook known{end-hook}if
%%EOF

-------------------

Marc Snir
IBM T.J. Watson Research Center
P.O. Box 218, Yorktown Heights, NY 10598
email: snir@watson.ibm.com
phone: 914-945-3204
fax: 914-945-4425

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