As was already mentioned, each memory access is considered as the access to the same memory location
, so the possibility of simultaneous memory access is disabled, and thus also the possibility of nondeterministic instruction execution order that would corrupt the semantics of parallel programs.
Contents of the memory locations
during the execution of the program whose waveform pattern is given in Figure 7 are provided as follows:
(1) Mode#0: generally software configurations are consecutive and increment in the memory location
. In such case the base and offset fields sustain the previous values and the 2-bit identifiers of the "Same Base" and "Consecutive Address" are asserted.
Finally, waiting for the memory location
in OCM that is used as a semaphore flag to be cleared.
In the single core, the processor presents the cache with a series of requests for memory locations
, where each request appears after the last one has been served.
(2) At a program point p, a memory location
l is semiexpectable if each computational path to p
The purpose of each memory location
requires investigation in order to determine which physical aspects of the boiler control system can be influenced.
The solution constructed uses at most D - 1 additional memory locations
Specifically, for each equation, X defined over a domain [D.sub.X] in the SARE, the result of computing X(z) for some point z [element of] [D.sub.X] is allocated to memory location
[[Pi].sub.X]z, where [[Pi].sub.X] is a projection.
Atomic operations that use optimistic synchronization use a load-linked primitive to retrieve the initial value in an updated memory location
. They compute the new value, then use a store conditional primitive to attempt to write the new value back into the memory location
Although DSMs have globally addressable memory, the time required to access a memory location
varies depending on the location of the physical memory unit with respect to the processor accessing it.
This illusion is transparent to programmers in spite of the fact that main memory storage may be physically distributed and multiple data copies of the same memory location
may exist in private caches.