42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#ifndef __GC_H
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#define __GC_H
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#include "util.hh"
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/* Garbage collector operation. */
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typedef enum {
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gcReturnRoots,
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gcReturnLive,
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gcReturnDead,
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gcDeleteDead,
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} GCAction;
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/* If `action' is set to `gcReturnRoots', find and return the set of
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roots for the garbage collector. These are the store paths
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symlinked to in the `gcroots' directory. If `action' is
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`gcReturnLive', return the set of paths reachable from (i.e. in the
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closure of) the roots. If `action' is `gcReturnDead', return the
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set of paths not reachable from the roots. If `action' is
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`gcDeleteDead', actually delete the latter set. */
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void collectGarbage(GCAction action, PathSet & result,
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unsigned long long & bytesFreed);
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/* Register a temporary GC root. This root will automatically
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disappear when this process exits. WARNING: this function should
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not be called inside a BDB transaction, otherwise we can
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deadlock. */
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void addTempRoot(const Path & path);
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/* Remove the temporary roots file for this process. Any temporary
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root becomes garbage after this point unless it has been registered
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as a (permanent) root. */
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void removeTempRoots();
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/* Register a permanent GC root. */
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Path addPermRoot(const Path & storePath, const Path & gcRoot,
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bool indirect);
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#endif /* !__GC_H */
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