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Daniel Hillerström
2020-10-11 21:46:47 +01:00
parent 0a13628c16
commit 99b42ee7f1
1 changed files with 11 additions and 10 deletions
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thesis.tex
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@@ -2457,7 +2457,7 @@ process, whilst its clone is referred to as the child process.
Following an invocation of fork, the parent process is provided with a Following an invocation of fork, the parent process is provided with a
nonzero identifier for the child process and the child process is nonzero identifier for the child process and the child process is
provided with the zero identifier. This enables processes to determine provided with the zero identifier. This enables processes to determine
their respective roles in the parent-child relationship, e.g. their respective role in the parent-child relationship, e.g.
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\[ \[
\bl \bl
@@ -2469,9 +2469,9 @@ their respective roles in the parent-child relationship, e.g.
\] \]
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In our system, we can model fork as an effectful operation, that In our system, we can model fork as an effectful operation, that
returns a boolean to indicate the process role; where by convention we returns a boolean to indicate the process role; by convention we will
will interpret the return value $\True$ to mean that the process interpret the return value $\True$ to mean that the process assumes
assumes the role of parent. the role of parent.
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\[ \[
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@@ -2484,13 +2484,14 @@ In \UNIX{} the parent process \emph{continues} execution after the
fork point, and the child process \emph{begins} its execution after fork point, and the child process \emph{begins} its execution after
the fork point. the fork point.
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Thus, operationally, we may understand fork as returning twice. We can Thus, operationally, we may understand fork as returning twice to its
implement this behaviour by invoking the resumption arising from an invocation site. We can implement this behaviour by invoking the
invocation of $\Fork$ twice: first with $\True$ to continue the parent resumption arising from an invocation of $\Fork$ twice: first with
process, and subsequently with $\False$ to continue the child process $\True$ to continue the parent process, and subsequently with $\False$
(or the other way around if we feel inclined). to start the child process (or the other way around if we feel
inclined).
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The following handler realises this behaviour. The following handler implements this behaviour.
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\[ \[
\bl \bl