#pragma once

#include "types.hh"


namespace nix {


/* Open (possibly create) a lock file and return the file descriptor.
   -1 is returned if create is false and the lock could not be opened
   because it doesn't exist.  Any other error throws an exception. */
int openLockFile(const Path & path, bool create);

/* Delete an open lock file. */
void deleteLockFile(const Path & path, int fd);

enum LockType { ltRead, ltWrite, ltNone };

bool lockFile(int fd, LockType lockType, bool wait);


class PathLocks 
{
private:
    typedef std::pair<int, Path> FDPair;
    list<FDPair> fds;
    bool deletePaths;

public:
    PathLocks();
    PathLocks(const PathSet & paths,
        const string & waitMsg = "");
    bool lockPaths(const PathSet & _paths,
        const string & waitMsg = "",
        bool wait = true);
    ~PathLocks();
    void unlock();
    void setDeletion(bool deletePaths);
};


bool pathIsLockedByMe(const Path & path);


}
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<div class='path'>path: <a href='/guix/log/?id=6aa25ab3b332deb070e6d4c6ca2786e4dead69b9'>root</a>/<a href='/guix/log/nix?id=6aa25ab3b332deb070e6d4c6ca2786e4dead69b9'>nix</a>/<a href='/guix/log/nix/libstore?id=6aa25ab3b332deb070e6d4c6ca2786e4dead69b9'>libstore</a>/<a href='/guix/log/nix/libstore/sqlite.hh?id=6aa25ab3b332deb070e6d4c6ca2786e4dead69b9'>sqlite.hh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/libstore/sqlite.hh?id=6aa25ab3b332deb070e6d4c6ca2786e4dead69b9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-10-28 22:30:17 +0200'>2016-10-28</span></td><td><a href='/guix/commit/nix/libstore/sqlite.hh?id=b1fd0ab73425e682a0a1404da6963f47a033bb34'>daemon: Improve the SQLite wrapper API.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2016-10-28 22:30:17 +0200'>2016-10-28</span></td><td><a href='/guix/commit/nix/libstore/sqlite.hh?id=7bed5d91dea6ecff565d51a021e6f99718d04f86'>daemon: Factor out SQLite handling.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>