forked from lix-project/lix
c8d3882cdc
parallel as possible (similar to GNU Make's `-j' switch). This is useful on SMP systems, but it is especially useful for doing builds on multiple machines. The idea is that a large derivation is initiated on one master machine, which then distributes sub-derivations to any number of slave machines. This should not happen synchronously or in lock-step, so the master must be capable of dealing with multiple parallel build jobs. We now have the infrastructure to support this. TODO: substitutes are currently broken.
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
#ifndef __NORMALISE_H
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#define __NORMALISE_H
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#include "storeexpr.hh"
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/* Normalise a store expression. That is, if the expression is a
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derivation, a path containing an equivalent closure expression is
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returned. This requires that the derivation is performed, unless a
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successor is known. */
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Path normaliseStoreExpr(const Path & nePath);
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/* Realise a closure store expression in the file system.
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The pending paths are those that are already being realised. This
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prevents infinite recursion for paths realised through a substitute
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(since when we build the substitute, we would first try to realise
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its output paths through substitutes... kaboom!). */
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void realiseClosure(const Path & nePath);
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/* Ensure that a path exists, possibly by instantiating it by
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realising a substitute. */
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void ensurePath(const Path & path);
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/* Read a store expression, after ensuring its existence through
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ensurePath(). */
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StoreExpr storeExprFromPath(const Path & path);
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/* Get the list of root (output) paths of the given store
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expression. */
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PathSet storeExprRoots(const Path & nePath);
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/* Get the list of paths that are required to realise the given store
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expression. For a derive expression, this is the union of
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requisites of the inputs; for a closure expression, it is the path
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of each element in the closure. If `includeExprs' is true, include
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the paths of the store expressions themselves. If
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`includeSuccessors' is true, include the requisites of
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successors. */
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PathSet storeExprRequisites(const Path & nePath,
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bool includeExprs, bool includeSuccessors);
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/* Return the list of the paths of all known store expressions whose
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output paths are completely contained in the set `outputs'. */
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PathSet findGenerators(const PathSet & outputs);
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#endif /* !__NORMALISE_H */
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