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&;&;</d</r</><div>


<div class="example"><pre>
<span class"GAPprompt">><span spanclassspanjava.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 92
true
<span class="GAPprompt""gap>gt> >>span < ="">aveReadAccess(;</java.lang.StringIndexOutOfBoundsException: Index 87 out of bounds for length 87
false
<span class="GAPprompt">gap></span> <span class="GAPinput">atomic readonly l do t := HaveReadAccess(l); od;; t;</span>
true
</pre

<p><a ="X794206E5845006EA" name="X794206E5845006EA>



<h5>3.9-34 HaveWriteAccess</h5>

<div class=java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p>The <code class="func">HaveWriteAccess</code> function returns true if the current thread has write access to <var class="Arg">objpThe< class"HaveWriteAccess/> function returns true if the current thread has write access to obj.


< class="example">pre
<span="h5>3.99 <>
true
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<p>div class"example"><pre>

<h5>3.9-35 MakeReadOnlyObj</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ MakeReadOnlyObj</code>( <var class="Arg">obj</varpThe class"func">ViewSharedcodefunction theinspection  objects regions  trylockregion call<codeclassViewObj)<>  it a   , will  normal  ./java.lang.StringIndexOutOfBoundsException: Index 298 out of bounds for length 298
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pa id="X7EC9341A865BCC35" name="X7EC9341A865BCC35>

="
"gapgt;span class""l3;/java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72

<Atomicstatements observe ordering means  highest 

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<<id name08>>/p

<h5>3.9-37 IsReadOnlyObj</h5>

<divp> of  regions/pre/>
<p>The <


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false
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<>a id"" name"7"<a>p>

<h5>3.9-38 SetRegionName</h5>

<div class="func"><table class="func" width="100%"><tr><java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p>The java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id="X8427E1537ADC4575"

<h53 </h5

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class] := l2[i];od/>
<>he classf"ClearRegionNameclears nameof

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<nNameh5

< classpre>
<p>The <code class="func">RegionName</code>

<p>aidX80D0DFAB7F7241E8="X80D0DFAB7F7241E8"></a>>The of  function toconcurrent of,where threadsattemptsetvalueconcurrently onesucceed threads then thevaluecode=""BindOnce>as the value the.It allows the initialization objects the .<p>

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< class
<p>ThepInstead atomic, entire candeclared be. This the effectthough function    in tatement Function can bedeclared code=codereadwriteor code<codethey     . Iffunctionis < classc">readwrite norcodeclass="code></code,thenot .Example/p>

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Quelle  chap3.html   Sprache: HTML

 
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<title>GAP (hpc) - Chapter 3: How HPC-GAP organizes shared memory: Regions</title>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X8508A72B7C215FA5">3.9-15 ShareSingleObjspan="ContSS"> /< classnocss&; /><a href"chap3.html#X7CB671AE7A411314">3.92 ShareSingleSpecialObj</<span
<< class="ContSS"><br/><span="nocss>nbsp&;>3.92 LockAndMigrateObj>>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X81A356DD84E76A8A">3.9-21 MigrateObj</a></span>
">3.9-2 MigrateSingleObj

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<span class="ContSS"><br/>< class=nocss&<=br ><=>;nbsp< =".html>2estBindOnce>
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<span class="ContSS"><br /><span<span class="ContSS"><br >< class""divjava.lang.StringIndexOutOfBoundsException: Range [12, 13) out of bounds for length 12
<span ="ContSS"><br /<span="nocssjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
<span=""><>span=nocss;nbspspan href=chap3X794206E5845006EA3-4HaveWriteAccessa>/>
< =">br / class"nocssnbsp&bsp hrefchap3#F53D70285AF37B4.35MakeReadOnlyObj</a>span
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X7EC9341A865BCC35">3.9-36 MakeReadOnlySingleObj</a></span>
bj</></>
<span class="ContSS"><br /><span class="nocss">  span classContSS>br/< classnocss&; /><a href=chap3X7FD1B1B785E2473439-3<java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
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<=ContSS/classnocss;/panhref.#X7959FC997CC9177C-RegionNamespan
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3.html#X7FD1B1B785E24734">3.9-43 <span class="Heading">The/
</span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a>/< "">nbsp< ".#"31TestBindOnce>span
/>
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<> < class> HPC-GAP organizesshared: <span>

<

<p><a id>36spanclass> objects  </>/java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<h4>3.1 <span class="Heading">Thread-local regions</span

<p>Each thread

<p>Only the

<p><a

<h4

<java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p>See the section on <code class="code">atomic</code> statements (<a href="chap3

<p><a id="X83627591876D3FF3" name

<h4>3.3 <span class="Heading">Ordering of shared regions</span></h4>

<pSharedregions are by default ordered; each

<p>The requirement can be in :  with negative precedence  excluded it  exception be with,asit lead deadlocks<p>

<p>,  or regions be simultaneously thecode ="">tomiccode>statement java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<><aid=X8239FDC583A4E39D="

<h4>3.4 <p>A  public  containsobjects only atomic. These, in, allimmutable objectsimmutable

<p>A special public

<p>Allthreadscan  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id

<h4>3.5 <span

<p>The

<p><a id

<>3.6 span

<p><p>One exception is that threads can

<p>The 

<ass

<p>The 

<>,< class=func</code < ref

<p>To migrate

<p>Itjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p>The exceptionThe <code="">


<div class="example"><pre<span=GAPpromptgapjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
class>;span=GAPinput>MakeImmutable1,,3);/>
< regiongt
</pre></div> classfuncNewRegioncode>will aregion a   level region

<< idX79A959BF7C24234F=""></a>

<4>3.7<java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p>Regions

<>regions havesame./>

<p<idX827637EE7A69AFCDname86EE7A69AFCD</a/java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62

<h4

<p>If either GAP

<One is threads modify < ""NewSystemRegion> like "ewRegion(a hrefchap3#java.lang.StringIndexOutOfBoundsException: Range [135, 134) out of bounds for length 428

<p>To inspect objects whose contents lie in other regions (and therefore cannot be displayed by <code

<p><a id>3java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<h4

a<p>

<h5>3.9

<div classjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
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< ="example">>
<span class="GAPprompt">gap
<region:>f code="func"/>creates sharedoptional <var"rg"n/aris thentheregionbetovarArg<.p
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<p><code class="funcNewRegion("example");

<pi"">/>

<h5>3.9-2 NewLibraryRegion>a id"=X86BEBBAF855AA26A<>pjava.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62

<div class="func"><table n/h5>
<p><java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0

<p><a id="X7FB0BE4C78CA85DA" name="X7FB0BE4C78CA85DA"></a<p><codeclassfunc<code> functions <code ="">NewRegion

<>3<>3.9NewSystemRegion<h5>

< classfunc>table="func" width10""unc&227; </code( class"">gt<< =">3]);span>
<<code="">ewSystemRegion>   <java.lang.StringIndexOutOfBoundsException: Range [3, 1) out of bounds for length 428

<p><a id="X825A881A7A39C5C3" name="X825A881A7A39C5C3"></a></p>

<h5>3.9<p<a="X825A881A7A39C5C3" name"X825A881A7A39C5C3"></a></p>

<div class="func"><table class="func" width="100%"><tr><td
<< class=<region&;

<p><a id="X86C54C9278FE00F4" name="X86C54C9278FE00F4"></a></p>

<h5 ="

<divpreclass>table"0%tr
"&7NewInternalRegion"ame<
<>codeclass"NewInternalRegion/code functionsjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

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<h5

<div class""><span"GAPprompt">gtspan =GAPinputegionOf,3) RegionOf(5/
<<class><ahref.X83864D427DE991F2spanRefLink/)functionscode"NewRegion <".">spanclass""31) that of the regionitcreatesisnegative Itithusexemptfrom ordering

<p><a id="X86BEBBAF855AA26A" name="X86BEBBAF855AA26A"><

<h5>3.9-7 RegionOf</h5>

<div classjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<><codeclassfunc<>willtheofregionvar""obj><p
<span class="GAPprompt">
<public region>
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<: thread#>
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<00
<regionx45deaa0 =>&;</ <span"GAPinputRegionOfShareObj(13))/span>
<span class="GAPprompt">gap></spanspanclass"">gap;</pan<span class"GAPinput"><span class="GAPprompt">gap></span> <span class="GAPinput">RegionPrecedence
<<java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
</pre<div>

<p>Note


div"
<spanclass=GAPprompt>&;</spanspan=GAPinputRegionOf2 [6;<sjava.lang.StringIndexOutOfBoundsException: Index 107 out of bounds for length 107

</pre></div>

<>a="name"">/a



<p><a id="X87421870782B33C7" name="X87421870782B33C7"></a></p>

<h5java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0

<div class="func"><table class
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<h53.-9 ShareObjh5

<div ="span =GAPprompt>gap&;spanclass""RegionPrecedenceNewLibraryRegion"" 1;/pan>
<p>The <code class="funcjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

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<h5areLibraryObj<h5

< p>class  a  Itintended    codeThe can t  var=Arg<varargumentthe way<code ""N/><hrefchap3"spanclass""3-/span>a)
<p>code class=funcShareLibraryObjcode>functions 

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<h5.-11 </h5

<div class="funcfunc="00%>r> class="code>22;ShareSpecialObj(var=></[<var=""></ar/<class(function)/>/<<iv
<p><code class="func">ShareSystemObj</code> functions like <code class="func">ShareObj</code> (<<><odeclass="func>> =RefLink">3.p< java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 304

<p><a 

<h5>3.9-java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

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<p><a id="X792DAE2C83BD1554" nameX792DAE2C83BD1554<>/>

<h5>3.9-13 ShareInternalObj</h5>

<divclassfunc< class
<p><code class="func">ShareInternalObj</code> functions like <code class="func">ShareObj</code(<a href="chap3.html#X7D5982617A3027BD"><span class=<class"&;spanspan ="APinput);;span

<p><a id="X82F3B2597E0EC15E" name="X82F3B2597E0EC15E"></a></p>

<h5.9- ShareSpecialObj</h5

<div class="func

aid"X792DAE2C83BD1554=
<p[rue ]

FA5"=p>idX82F3B2597E0EC15E" ="/java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
<p>The <code class="func">ShareSingleObj</code> function creates a new shared region and migrates the f="chap3.htmlX7D5982617A3027BD>< ="">3.9-/span>, except that the precedenceofthe it creates is It is java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0


<div class="example
<span class="GAPpromptdiv class=">table ="func" width"100>tr< =tdleft>code="func#82; </code( <varp><code class="func">ShareSingleLibraryObj</code> functions like <code class="func">ShareSingleObj</code> (<a href="chap3.html#Xs/>except  of region isthatcodefunc< (<h=.#50> class"39-5<>. s to used u and packages
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<p><code class="func">ShareSingleObj/

<p><a id="p>java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<h5>3.9-16 ShareSingleLibraryObj<<code class"/> ""< (<=chap3html> =">1<) except the of  it is lowest. It  to     are; i..no  that such may another whileaccessingit>

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p<id"name"X8352EF8B83390656<
<h5

<div class="func"><tablec=""funcwidth0<classtdleft< ""&22 /><></var ame,var/><"( 


<p><code class="div="func><java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 250

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<ShareSingleKernelObj

<div class="func"><table
pcode=ShareSingleKernelObj  like =func<code>hX8508A72B7C215FA5/<>,except   precedenceit   =func<code hrefhtml>span="9-/>/>. it bytheGAPernel,andlcode iththe .

<p><a id="X85C5F5A67DAFD919" name="X85C5F5A67DAFD919"></a></p>

<h5>3.9-19 ShareSingleInternalObj</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func"<p>code class"func"ShareSingleKernelObj>  likejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p><code class="func">ShareSingleInternalObj</code

<p><a id="X7CB671AE7A411314" name="X7CB671AE7A411314"></a><<> <code ="func">LockAndMigrateObj/code function like<code class""><>(ajava.lang.StringIndexOutOfBoundsException: Range [116, 112) out of bounds for length 338

<h5>3.9-20 ShareSingleSpecialObj</h5>

<div=""><table="func" width"0"<>< classtdleft">RShareSingleSpecialObj/( class"Arg<[ <ar"Arg"name
<p><code

<p><a id="X81A356DD84E76A8A" name="X81A356DD84E76A8A"></a></p>



<div class="func"><table java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0
<p>Thelass="func"><table class="func" width="100%"><tr><td class="tdleft"><code class

<p>For thediv=>table="width>tr =" class"#7 <(<var=bj><c=""<<ctdright(nbspfunctiontdtr<java.lang.StringIndexOutOfBoundsException: Range [256, 257) out of bounds for length 256

<>< ="X7BAE5A7282793684"nameX7BAE5A7282793684/<p

<h5>3.9-22 MigrateSingleObj</h5>

<div class="func"><table class="func" width="100%"><tr><tdprediv>
<p>The <code class=class""><tableclass"func" width ap/panclass"tomic<>

<p><a p>hecodeclassfuncLockAndMigrateObjcode>function likecode classGAPprompt>/> class>     ( , [,6)/>

<<pan class="GAPprompt name=="X7D1943AF793296F7<>/a/java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62

<<>3.9- [ 123  4 , ,[79java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
<p>The <code classLockAndMigrateObj>div

<p><<p>Usingplain would leave newly lists inthethread-local region<p

<h5>3.9-24 IncorporateObj</h5>

<div class="func"><table class="func" width="100%"><tr><td
<p>The



IncorporateObj := function(    target[indexcodeclass=><code extends< class></>(ahrefchap3#7">>3.9-4</pan/a) byalso  targetI..,for list,itequivalentto/>
   valuedo
    target[index
  od;
:target]=MigrateObj
<prediv

<p>od;


<div class="example">
IncorporateObj := function(target, index, value)
  atomic java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   .)= 
  ;
nd
</pre></div>

<p>es after its .Example


<div class="example"><pre>
<
<span="GAPprompt>&;/>< "java.lang.StringIndexOutOfBoundsException: Range [61, 60) out of bounds for length 83
<panclassGAPprompt&;</span ">class="" ="1%<>< =tdleftcode="">#22 </codevar=Arg</var> )</><td=tdright&;functionnbsp</>/>tablediv
<span class="GAPprompt">></spanp>Using  assignment leave newly lists> code ""AdoptObjcode < class="Arg>/> (and sameregion) ' It accessto "Argbj>pjava.lang.StringIndexOutOfBoundsException: Index 241 out of bounds for length 240
<span class="GAPpromptGAPpromptgap;<span< ="l = ShareObj(1,23java.lang.StringIndexOutOfBoundsException: Range [82, 83) out of bounds for length 62
<span ="GAPprompt">gapgt/panspan"APinput">IsThreadLocal
<span class="GAPprompt"java.lang.StringIndexOutOfBoundsException: Index 86 out of bounds for length 86
,3[4, 5 6[7, , 9 ]
</pre></div>

<p>Using plain assignment would leave the newly created lists in the thread-local region.</p>

<p><a id="X876843717F4437CB"    targetindex : MigrateObj(, target

<h5>3.9-2 AtomicIncorporateObjh5

<div class="func"><table class="func" width="100%"><tr<iv class=java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<><codeclassfuncAtomicIncorporateObj<code> extends <code class="func">IncorporateObj</code> (<a href=".html#X7D1943AF793296F7"><spanclass="RefLink">3.-4/></>)  also thetarget .. for list isequivalentto/


<divatomic valuedo="
AtomicIncorporateObj := function(target, index, value)
  tomic,  do
    target] :=MigrateObjvalue targetjava.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
  od;
end;
<pre<div =functable =funcwidth0>tr classtdleftcodefunc2 </code> class""o<var</>< classtdright; &gt;/<table>

<>fThe="">CopyRegion/code>function   structural of<ar classArg">obj/var>.Theresultingobjectsill locatedin thecurrent 'thread-local The returns itsits./pjava.lang.StringIndexOutOfBoundsException: Index 242 out of bounds for length 242


<div class="example"><pre>
AtomicIncorporateObj := function(target, index, value)
    do
    target.(index) := MigrateObj(value, target)
  d;
end;
</pre>/div>

<p><aid"X784C978D801191E2 name"X784C978D801191E2">/p>

<h5>3.9-26 AdoptObj</h5span="GAPprompt">gap

<div class=
<p>The>


<=">java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
< ="GAPprompt>&;<>
<pt ""tablefuncwidth1"<>" ""W
false
<span class="GAPprompt">gap>
< class">gapgt;> ><table class="func" width="
<p>.- CopyRegion>

" name="X867CDC9285D30DE8/><java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4

<>

<div class="func"><table class="func" java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p>The <code class="func">LockAndAdoptObj</code> function works like keReadOnlyObj[12,)</>

<p><a id="X7C71A88487762733" namediv class""pre

<h5>3.9-29 CopyRegion</h5>

<div class=""><able class=
<>he<java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5


<div class="example"><pre>
<span class=java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
[ 1>< id
<span class="GAPprompt">gap></span> <span
 ,, 3]
<spandivclassfunc< =100%"<>< ="<class">#87;IsPublic
( varclass"">
false
<span class="GAPprompt">gap></span> <span class="GAPinput">IsIdenticalObj(l, l2);</span>
false
<span class=java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
true
</pre</iv

<p><a id="X8222929685E9959A" name="X8222929685E9959A"></a></p>

<h5>3.9-30 IsPublic</h5>

div"">table="func" ="100%"<tr<=tdleft =func#27 java.lang.StringIndexOutOfBoundsException: Index 102 out of bounds for length 4
e <codeclass">/ode>functionreturns ifitsargument is an < =GAPprompt>gap&;>(ShareObj23)<


<div<span  classspan"">>spanspan ="GAPinput>((12,));
<span class="GAPprompt">gap></span> <span class="GAPinput">java.lang.StringIndexOutOfBoundsException: Range [0, 70) out of bounds for length 4
true
<pan="GAPprompt>gap&;/pan
false
<span class="GAPprompt">gap><p>h5.- IsThreadLocalh5
false
<span="GAPprompt">>> <span="GAPinput">IsPublic([12,3);<span
true
</pre></div>

<p><a id="X86B2EEF67C3378F0" name> <span="GAPinput">IsThreadLocal

<h5>3.9-31 IsThreadLocal</h5>

<divclassfunc classGAPprompt&; <classGAPinput>(ShareObj,2,];</span
<p>The


 class"pre>
<span class="GAPprompt">gap&span class=APprompt
true
<span class
false</re><
< classGAPpromptgapgtspan< classGAPinputIsThreadLocal/;/span
false
<span="GAPprompt">
<public region>
<java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<>aidX80A11F3C84DB512Ename=X80A11F3C84DB512E>/</

<h5>3.9-32 IsShared</h5>

<div class="func"><table class="java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p>The <code class="func">IsShared</code> function returns true if its argument is an object in a shared region. Note that 

<>< ="X827A26A67C99316C" name="X827A26A67C99316C"></a></p>

<h5>3.9-33 HaveReadAccess</h5>

<div="func"">table ="func"0%"><<tdclasstdleft">obj
<

<p>The <code class class=""=w="10%>>tdclasstdleft>code class=func&827 IsReadOnlyObjIsReadOnlyObj<( var class="">obj )
><ode="func">82; TestBindOnce</code>( <var class"Arg">bj</>, < class=Arg>index>, <var="Arg">value/ar> )/><tdclasstdrightnbsp; /><>/div

<h5= ="java.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 62

<div class="func"><table class="func" width="100
<>he codeclass=""UNSAFE_VIEW>functionthe anythe

<p>Moreover, the function works by temporarily disabling read and write guards for regions

<>It is safe use if

<p><a id="java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0

<h5>3.9-43 <span class="Heading">The <code class="code">atomich5.1

<p>The<divclassfunc class"width10"><tr><td class="tdleft"><code 


<div class="example"><pre>
atomic (readwritereturn(obj ,expr)
  statements
od;> current needs  haveat readaccess to var="Arg"obj> but else
</pre></div>

 ;


<div class>pre
<span class="GAPprompt"
<span="GAPprompt"gap
<span implementation component p<code class<code like ="func""BindOnce/code (chap3>,that  ""truebeode">
<span class="GAPprompt">gap></span> <span <span class="GAPprompt">gap></span> <span class
[ 1,4, 9]
</pre></div>


<div class="example"><pre>
<span class="GAPprompt"gap<>< class""l ([,2345)<span
<span class="GAPprompt">gap>nceExpr</> works like<code java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<span class="GAPprompt">gap></span> <span class="GAPinput"><p><a id"X7897092C86AE17D7""name= if not IsBound(![index]) then
<span class="GAPprompt">></span <span class="GAPinput">      i in [1.] do[]:= [i]; odelse
<span java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 =GAPprompt;/> spanGAPinput;<span
<span class="GAPprompt">gap></span> <span class=
[
</pre></div>

<>tomic statements must observe region ordering. That

<p><a <h5>3.11-4</>

<.10<span=""> functions/></>

<> of regions entire can declaredto atomic has same as thefunctions body enclosed  .Functionarguments beeither class"ode"readwrite</code> or class=codereadonlycode; they will locked the way for  statement  a function is byneither class""readwrite> code classcode><code,  corresponding   be.:/>


<div class="examplen>.1
<span class="GAPprompt">gap></span> <span class ="func"><table="func" width"10"<>td""><codeclass"#27;StrictBindOnce
var="
Arg</> varArg"><="expr <tdclass">(nbsp;&;)

<span="">>/> < class"APinput"     (list)<span
<span class="GAPprompt">></span> <span class="GAPinput">   end;</span>
</pre></div>

<p><a id="X78883D5E83B4425F" name="X78883D5E83B4425F"></a></

<h4.1span="Heading">Write-once</span<h4

<p>There is an exception

<p>For reasons of implementation symmetry, these functions can also be used on the atomic versions of these objects.</p>

<p>Implementation note: The functionality is not currently available for component objects.</p>

<p><a id="X83AD36A68503CF70" name="X83AD36A68503CF70"></a></p>

<h5>3.11-1 BindOnce</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ BindOnce</code>( <var class="Arg">obj</var>, <var class="Arg">index</var>, <var class="Arg">value</var)</td><td class="tdright">( function )</td></tr></table></div>
<p><code class="func">BindOnce</code> modifies <var class="Arg">obj</var>, which can be a positionaobject, atomic positional object, component object, or atomic component object. It inspects <code class="code">obj![index]</code> for the positional versions or <code class="code">obj!.(index)</code> for the component versions. If the respective element is not yet bound, <var class="Arg">value</var> is assigned to that element. Otherwise, no modification happens. The test and modification occur as one atomic step. The function returns the value of the element; i.e. the old value if the element was bound and <var class="Arg">value</var> if it was unbound.</p>

<p>The intent of this function is to allow concurrent initialization of objects, where multiple threads may attempt to set a value concurrently. Only one will succeed; all threads can then use the return value of <code class="func">BindOnce</code> as the definitive value of the element. It also allows for the lazy initialization of objects in the read-only region.</p>

<p>The current thread needs to have at least read access to <var class="Arg">obj</var>, but does not require write access.</p>

<p><a id="X8673539F7DA79110" name="X8673539F7DA79110"></a></p>

<h5>3.11-2 TestBindOnce</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ TestBindOnce</code>( <var class="Arg">obj</var>, <var class="Arg">index</var>, <var class="Arg">value</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p><code class="func">TestBindOnce</code> works like <code class="func">BindOnce</code> (<a href="chap3.html#X83AD36A68503CF70"><span class="RefLink">3.11-1</span></a>), except that it returns <code class="keyw">true</code> if the value could be bound and <code class="keyw">false</code> otherwise.</p>

<p><a id="X7BAEC41C87E1DC43" name="X7BAEC41C87E1DC43"></a></p>

<h5>3.11-3 BindOnceExpr</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ BindOnceExpr</code>( <var class="Arg">obj</var>, <var class="Arg">index</var>, <var class="Arg">expr</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p><code class="func">BindOnceExpr</code> works like <code class="func">BindOnce</code> (<a href="chap3.html#X83AD36A68503CF70"><span class="RefLink">3.11-1</span></a>), except that it evaluates the parameterless function <var class="Arg">expr</var> to determine the value. It will only evaluate <var class="Arg">expr</var> if the element is not bound.</p>

<p>For positional objects, the implementation works as follows:</p>


<div class="example"><pre>
BindOnceExprPosObj := function(obj, index, expr)
  if not IsBound(obj![index]) then
    return BindOnce(obj, index, expr());
  else
    return obj![index]);
  fi;
end;
</pre></div>

<p>The implementation for component objects works analogously.</p>

<p>The intent is to avoid unnecessary computations if the value is already bound. Note that this cannot be avoided entirely, because <code class="code">obj![index]</code> or <code class="code">obj!.(index)</code> can be bound while <var class="Arg">expr</var> is evaluated, but it can minimize such occurrences.</p>

<p><a id="X81B15A9C8795DF59" name="X81B15A9C8795DF59"></a></p>

<h5>3.11-4 TestBindOnceExpr</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ TestBindOnceExpr</code>( <var class="Arg">obj</var>, <var class="Arg">index</var>, <var class="Arg">expr</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p><code class="func">TestBindOnceExpr</code> works like <code class="func">BindOnceExpr</code(<a href="chap3.html#X7BAEC41C87E1DC43"><span class="RefLink">3.11-3</span></a>), except that it returns <code class="keyw">true</code> if the value could be bound and <code class="keyw">false</code> otherwise.</p>

<p><a id="X7897092C86AE17D7" name="X7897092C86AE17D7"></a></p>

<h5>3.11-5 StrictBindOnce</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ StrictBindOnce</code>( <var class="Arg">obj</var>, <var class="Arg">index</var>, <var class="Arg">expr</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p><code class="func">StrictBindOnce</code> works like <code class="func">BindOnce</code> (<a href="chap3.html#X83AD36A68503CF70"><span class="RefLink">3.11-1</span></a>), except that it raises an error if the element is already bound. This is intended for cases where a read-only object is initialized, but where another thread trying to initialize it concurrently would be an error.</p>


<div class="chlinkprevnextbot"> <a href="chap0.html">[Top of Book]</a>   <a href="chap0.html#contents">[Contents]</a>    <a href="chap2.html">[Previous Chapter]</a>    <a href="chap4.html">[Next Chapter]</a>   </div>


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