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The value o f * a starts a t O Because two increments happen, we would expect the resulting value to be 0 + 2 2 However, * a ends up at 1 This clearly violates the first correctness condition of our algorithm as stated ini tially: for each thread that invokes the increment operator, the global counter increments by exactly 1 This is a classic race condition, or more precisely, a data race, because, in this case, our problems are caused by a lack of data synchronization It is called a "race" because the correctness of our code depends squarely on the outcome of multiple threads racing with one another It's as if each is trying to get to the finish line first, and, depending on which gets there first, the program will yield different results, sometimes correct and sometimes not Races are just one of many issues that can arise when shared state is involved and can be a serious threat to program correctness A thorough exploration of concurrency hazards, including races, is presented in 1 1 , Concurrency Hazards Why did this race manifest It happened because t1 and t2 each made a copy of the shared memory value in their own processor local register, one after the other, both observing the same value of 0, and then incremented their own private copies Then both copied their new values back into the shared memory without any validation or synchronization that would pre vent one from overwriting the other's value Both threads calculate the value 1 in their private registers, without knowledge of each other, and, in this particular case, tl just overwrites t2' s earlier write of 1 to the shared location with the same value One might question how likely this is to occur (Note that the likelihood matters very little The mere fact that it can occur means that it is a very serious bug Depending on the statistical improbability of such things is seriously discouraged A program is not correct unless all possible sources of data races have been eliminated ) This interleaved history can happen quite easily, for obvious reasons, if tl and t2 were running on separate processors The frequency depends on the frequency with which the rou tine is accessed, among other things This problem can also arise on a single processor machine, if a context switch occurred-because tl 's quantum had expired, because t2 was running at a higher priority, and so forth-right after t 1 had moved the contents of a into its EAX register or after it had.

incremented its private value The probability of this happening is higher on a machine with multiple processors, but just having multiple threads running on a single processor machine is enough The only way this may be impossible is if code accessing the same shared state is never called from multiple threads simultaneously Other execution histories exhibit the same problem

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t 1 ( 8 ) - >t 2 ( 8 ) - >t 1 ( 1 ) - >t 1 ( 2 ) - >t 2 ( 1 ) - > t 2 ( 2 ) t 1 ( 8 ) - >t 1 ( 1 ) - >t 2 ( 8 ) - >t 1 ( 2 ) - >t 2 ( 1 ) - >t 2 ( 2 ) t 2 ( 8 ) - >t 1 ( 8 ) - >t 1 ( 1 ) - >t 1 ( 2 ) - >t 2 ( 1 ) - > t 2 ( 2 ) a n d s o on

If we add the t3 thread back into the picture, we can violate the second correctness condition of our simple increment statement, in addition to the first, all at once

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A access control, 279 281 acquisition, domain of, 189 A/D (analog-to-digital) conversion, 57 58 Adobe Premiere, 145 147 adoption curve (S-curve), 180 advertising-supported delivery, 190, 191 AE (autoexposure) function, 41 42 AFM audio channels, 45 Agents-Everyhere, 148 149 AIST, 149 Akamai, 221 223 AllBand technology, 123 127 AMD, 102 Antex, 53, 72 Anystream, 72 aperture, 12 13 APIs (application programming interfaces), 81, 84 archives, 179, 271 ASIC technology (Winnov), 86 aspect ratios, 21, 60, 63, 272 ASPs (application service providers), 187 assets See also content management of, 200 203, 225 228 repurposing, 232 234 AT (autotracking) mode, 41

T tl 8 1 t l ( 8 ) : MOV EAX , [ a ] #8 2 t l ( l ) : I N C , EAX #1 3 t l ( 2 ) : MOV [ a ] , EAX #1 4 t2 t3 t 3 ( 8 ) : MOV EAX , [ a ] #8

5 6 7 8

t 2 ( 8 ) : MOV EAX , [ a ] #1 t 2 ( 1 ) : I N C , EAX #2 t 2 ( 2 ) : MOV [ a ] , EAX #2 #1 t3 ( 1 ) : I N C , EAX t3 ( 2 ) : MOV [ a ] , EAX #1

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