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doc/papers/concurrency/Paper.tex
rb4e1876 r09ccaf5 217 217 \lstMakeShortInline@% 218 218 219 \newcommand{\commenttd}[1]{{\color{red}{Thierry : #1}}}220 221 219 \let\OLDthebibliography\thebibliography 222 220 \renewcommand\thebibliography[1]{ … … 310 308 `&`r3 = &y; `&&`r3 = &`&`r4; // change r1, r2: cancel implicit dereferences (&*)**r3, (&(&*)*)*r3, &(&*)r4 311 309 \end{cfa} 312 A reference is a handle to an object, like a pointer, but is automatically dereferenced bythe specified number of levels.310 A reference is a handle to an object, like a pointer, but is automatically dereferenced the specified number of levels. 313 311 Referencing (address-of @&@) a reference variable cancels one of the implicit dereferences, until there are no more implicit references, after which normal expression behaviour applies. 314 312 … … 480 478 481 479 The signature feature of \CFA is parametric-polymorphic routines~\cite{} with routines generalized using a @forall@ clause (giving the language its name), which allow separately compiled routines to support generic usage over multiple types. 482 For example, the following sum routine works for any type that supports construction from 0 and addition \commenttd{constructors have not been introduced yet.}:480 For example, the following sum routine works for any type that supports construction from 0 and addition: 483 481 \begin{cfa} 484 482 forall( otype T | { void `?{}`( T *, zero_t ); T `?+?`( T, T ); } ) // constraint type, 0 and + … … 532 530 { 533 531 VLA x, y = { 20, 0x01 }, z = y; $\C{// z points to y}$ 534 // x{}; y{ 20, 0x01 }; z{ z, y }; 532 // x{}; y{ 20, 0x01 }; z{ z, y }; 535 533 ^x{}; $\C{// deallocate x}$ 536 534 x{}; $\C{// reallocate x}$ … … 569 567 The resulting execution system now follows a cooperative threading-model, called \newterm{non-preemptive scheduling}. 570 568 571 Because the scheduler is special, it can either be a stackless or stackfull coroutine. \commenttd{I dislike this sentence, it seems imply 1-step vs 2-step but also seems to say that some kind of coroutine is required, which is not the case.}569 Because the scheduler is special, it can either be a stackless or stackfull coroutine. 572 570 For stackless, the scheduler performs scheduling on the stack of the current coroutine and switches directly to the next coroutine, so there is one context switch. 573 571 For stackfull, the current coroutine switches to the scheduler, which performs scheduling, and it then switches to the next coroutine, so there are two context switches. 574 A stackfull scheduler is often used for simplicity and security, even through there is a slightly higher runtime-cost. \commenttd{I'm not a fan of the fact that we don't quantify this but yet imply it is negligeable.}572 A stackfull scheduler is often used for simplicity and security, even through there is a slightly higher runtime-cost. 575 573 576 574 Regardless of the approach used, a subset of concurrency related challenges start to appear. … … 777 775 }; 778 776 void main( Format & fmt ) with( fmt ) { 779 for ( ;; ) { 777 for ( ;; ) { 780 778 for ( g = 0; g < 5; g += 1 ) { // group 781 779 for ( b = 0; b < 4; b += 1 ) { // block
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