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Daniel Hillerström
2021-05-29 11:56:35 +01:00
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thesis.tex
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with the world. with the world.
% %
Programs use words from this vocabulary with a preconceived idea of Programs use words from this vocabulary with a preconceived idea of
their meaning, however, importantly words are just mere syntax. The their meaning, however, importantly, words are just mere syntax. The
semantics of each word is determined by the operating system semantics of each word is determined by the operating
(typically such that it aligns with the intent of the program). system (typically such that it aligns with the intent of the
program).
This separation of syntax and semantics makes it possible for This separation of syntax and semantics makes it possible for
programs and operating systems to evolve independently, because any programs and operating systems to evolve independently, because any
@@ -272,7 +273,20 @@
to the expectations of the program. It has proven to be a remarkably to the expectations of the program. It has proven to be a remarkably
successful model for building and maintaining computer programs. successful model for building and maintaining computer programs.
\emph{Effect handlers} localise are tiny programmable operating systems Conventionally, an operating system has been a complex and
monolithic single global entity in a computer system.
%
However, \emph{effect handlers} are a novel programming abstraction,
which enables programs to be decomposed into syntax and semantics
internally, by localising the notion of operating systems. In
essence, an effect handler is a tiny programmable operating system,
that a program may use internally to determine the meaning of its
subprograms. The key property of effect handlers is that they
compose seamlessly, and as a result the semantics of a program can
be compartmentalised into several fine-grained and comprehensible
components. The ability to seamlessly swap out one component for
another provides a promising basis for modular construction and
reconfiguration of computer programs.
In this dissertation I develop the foundations for programming with In this dissertation I develop the foundations for programming with
effect handlers. Specifically, I present a practical design for effect handlers. Specifically, I present a practical design for
@@ -280,16 +294,6 @@
two universal implementation strategies for effect handlers, and I two universal implementation strategies for effect handlers, and I
give a precise mathematical characterisation of the inherent give a precise mathematical characterisation of the inherent
computational efficiency of effect handlers. computational efficiency of effect handlers.
% The meaning of words This separation of
% modular reconfiguration of programs
% Computer programs interact with the real world by way of \emph{system calls}\dots this interaction
% is facilitated by the operating system, which is responsible for
% %
% Effect handlers provide a modular means for structuring the internal
% code of computer programs.
\end{laysummary} \end{laysummary}
%% Acknowledgements %% Acknowledgements