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