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/*
+----------------------------------------------------------------------+
| HipHop for PHP |
+----------------------------------------------------------------------+
| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
*/
#ifndef incl_RANK_H_
#define incl_RANK_H_
#include <limits.h>
namespace HPHP {
/*
* The order in which we acquire blocking resources cannot produce
* deadlock if paths respect a partial order on the resources.
*/
enum Rank {
RankUnranked = -1, // Unranked locks can be inserted in any order.
/*
* Base rank locks are only ever acquired while no other locks are held.
* In a wedding-cake diagram of the system, these are the upper layers of
* frosting.
*/
RankBase = 0,
/*
* Fbml is currently the lowest ranked lock because we reenter the VM while
* holding it. This is probably a bad idea and is not intended to be
* permanent.
*/
RankFbml = RankBase,
RankUnitInit,
RankEvaledUnits,
RankWriteLease,
RankPreConstDep,
RankStatCache,
RankFileRepo,
RankStatCacheNode = RankFileRepo,
RankFileMd5,
RankTreadmill,
/*
* Leaf-rank locks are the deepest resources in the system; once you've
* acquired one, you can acquire no further resources without releasing
* one.
*/
RankLeaf
};
#ifdef DEBUG
extern Rank currentRank();
extern void checkRank(Rank r);
extern void pushRank(Rank r);
extern void popRank(Rank r);
extern void insertRank(Rank r);
#else
#define currentRank() RankBase
#define checkRank(r) do { } while(0)
#define pushRank(r) do { } while(0)
#define popRank(r) do { } while(0)
#define insertRank(r) do { } while(0)
#endif
}
#endif
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