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All o f this sounds great But i f it's s o great, you might ask, why isn't lock leveling already used pervasively as a deadlock prevention technique Lock leveling is actually a tad onerous and constraining for a few reasons

Assigning levels to your locks requires careful planning and a bit more engineering discipline It is hard to come up with levels in the first place-demanding careful thought about the global layering of the system's components-and forethought into specifically where locks will be necessary After that, maintaining the levels that you have assigned can be a chore Once you have come up with levels, the restrictions can sometimes be too great: lock leveling effectively requires static knowledge of call graphs around critical regions With late bound method calls (virtuals, function pointers, delegates), this is difficult Simultaneous lock acquisition (shown earlier) can be used to disambiguate certain cases where the relative ordering of a fixed number of locks isn' t known statically, but can't handle all cases Making a late bound call from inside of a critical region is a very bad practice anyhow, so one could argue that this is indicative of deeper problems

179% 27% 19% 27%

7

The last reason lock leveling isn' t used heavily is that neither C++ nor NET offer out-of-the-box support for it; the result is that most people aren't even aware that it exists

All that said, most arguments against lock leveling boil down to the inconvenience they pose to the development process It is ultimately up to you to decide whether or not that inconvenience is worth the added safety it brings I know which choice I would make Let's take an example of using leveled locks Imagine we have two subsystems, A and B, protected by a lock apiece We could assign system A level 1 0 and system B level S The rationale behind doing so could be that A represents a higher-level subsystem (like a business logic layer) and B represents a lower-level subsystem (like a data persistence engine) Notice how the assignment of levels closely maps to the way a system is factored: upward dependencies from B to A are probably prohibited, so the lock leveling requirements should pose no problems

If we had a Leve l e d Loc k class, we might construct instances of these as follows:

Any company with 1+ emloyees in 20 weeks of the current or preceding year or is subject to FUTA Same as federal Same as federal Same as federal Any company with payroll of $1,000+ in current or preceding year Same as federal Any company paying 1+ employees in the current year Same as federal Any company paying wages of $1,000+ in current or preceding year Any company with 1+ employees in 20 weeks of the current or preceding year Any company paying $300+ in wages in any calendar quarter Same as federal Same as federal Same as federal Same as federal Any company with 1+ employees in 18 weeks of the year Any company with 1+ employees in the calendar year Any company with 1+ employees in the current or preceding calendar year Any company with 1+ employees in the year Same as federal Same as federal Same as federal

Waiting Time Problems Table 77 A s Choice HHH HHT HTH HTT THH THT TTH TTT B s Choice THH THH HHT HHT TTH TTH HTT HTT P (B beats A) 7/8 3/4 2/3 2/3 2/3 2/3 3/4 7/8

new LeveledLoc k ( la ) ; new LeveledLoc k ( 5 ) ;