Commit 8b008be4 authored by Ralf Jung's avatar Ralf Jung

docs: update atomicity

parent 390748ab
Pipeline #3310 passed with stage
in 11 minutes and 5 seconds
......@@ -5,9 +5,9 @@ Coq development, but not every API-breaking change is listed. Changes marked
## Iris 3.0 (unfinished)
* There now is a deprecation process. The modules `*.deprecated`
contain deprecated notations and definitions that are provided for
backwards compatibility and will be removed in a future version of Iris.
* There now is a deprecation process. The modules `*.deprecated` contain
deprecated notations and definitions that are provided for backwards
compatibility and will be removed in a future version of Iris.
* View shifts are radically simplified to just internalize frame-preserving
updates. Weakestpre is defined inside the logic, and invariants and view
shifts with masks are also coded up inside Iris. Adequacy of weakestpre is
......@@ -23,11 +23,11 @@ Coq development, but not every API-breaking change is listed. Changes marked
* Renaming and moving things around: uPred and the rest of the base logic are
in `base_logic`, while `program_logic` is for everything involving the
general Iris notion of a language.
* [#] Slightly weaker notion of atomicity: an expression is atomic if it reduces
in one step to something that does not reduce further.
* Changed notation for embedding Coq assertions into Iris. The new notation
is ⌜φ⌝. Also removed `=` and `⊥` from the Iris scope.
(The old notations are provided in `base_logic.deprecated`.)
* Slightly weaker notion of atomicity: an expression is atomic if it reduces in
one step to something that does not reduce further.
* Changed notation for embedding Coq assertions into Iris. The new notation is
⌜φ⌝. Also removed `=` and `⊥` from the Iris scope. (The old notations are
provided in `base_logic.deprecated`.)
* Up-closure of namespaces is now a notation (↑) instead of a coercion.
* With invariants and the physical state being handled in the logic, there
is no longer any reason to demand the CMRA unit to be discrete.
......
......@@ -2,7 +2,7 @@
\label{sec:language}
A \emph{language} $\Lang$ consists of a set \Expr{} of \emph{expressions} (metavariable $\expr$), a set \Val{} of \emph{values} (metavariable $\val$), and a nonempty set \State of \emph{states} (metavariable $\state$) such that
\begin{itemize}
\begin{itemize}[itemsep=0pt]
\item There exist functions $\ofval : \Val \to \Expr$ and $\toval : \Expr \pfn \Val$ (notice the latter is partial), such that
\begin{mathpar}
{\All \expr, \val. \toval(\expr) = \val \Ra \ofval(\val) = \expr} \and
......@@ -21,8 +21,8 @@ A \emph{language} $\Lang$ consists of a set \Expr{} of \emph{expressions} (metav
\end{defn}
\begin{defn}
An expression $\expr$ is said to be \emph{atomic} if it reduces in one step to a value:
\[ \All\state_1, \expr_2, \state_2, \vec\expr. \expr, \state_1 \step \expr_2, \state_2, \vec\expr \Ra \Exists \val_2. \toval(\expr_2) = \val_2 \]
An expression $\expr$ is \emph{atomic} if it reduces in one step to something irreducible:
\[ \All\state_1, \expr_2, \state_2, \vec\expr. \expr, \state_1 \step \expr_2, \state_2, \vec\expr \Ra \lnot \red(\expr_2, \state_2) \]
\end{defn}
\begin{defn}[Context]
......@@ -55,3 +55,8 @@ For any language $\Lang$, we define the corresponding thread-pool semantics.
\cfg{\tpool \dplus [\expr_2] \dplus \tpool' \dplus \vec\expr}{\state_2}}
\end{mathpar}
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