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This cache does not have permission to modify the copy. Unlike the MESI protocol, a shared cache line may be dirty with respect to memory; if it is, one cache has a copy in the Owned state, and that cache is responsible for eventually updating main memory. If no cache holds the line in the Owned state, the memory copy is up to date.
A lock value block is associated with each resource. This can be read by any process that has obtained a lock on the resource (other than a null lock) and can be updated by a process that has obtained a protected update or exclusive lock on it. It can be used to hold any information about the resource that the application designer chooses.
ACFS [2] is a standard-based POSIX (Linux, UNIX) and Windows cluster file system with full cluster-wide file and memory mapped I/O cache coherency and file locking. ACFS provides direct I/O for Oracle database I/O workloads. ACFS implements indirect I/O however for general purpose files that typically perform small I/O for better response time.
PrRd: Processor request to read a cache block. PrWr: Processor request to write a cache block. State diagram of bus transactions for the MSI protocol. In addition, there are bus side requests. These include: BusRd: When a read miss occurs in a processor's cache, it sends a BusRd request on the bus and expects to receive the cache block in return.
An algorithm is lock-free if, when the program threads are run for a sufficiently long time, at least one of the threads makes progress (for some sensible definition of progress). All wait-free algorithms are lock-free. In particular, if one thread is suspended, then a lock-free algorithm guarantees that the remaining threads can still make ...
Flush: Snooped request that indicates that an entire cache block is written back to the main memory by another processor. FlushOpt: Snooped request that indicates that an entire cache block is posted on the bus in order to supply it to another processor (Cache to Cache transfers). (Such Cache to Cache transfers can reduce the read miss latency ...
Read-copy-update insertion procedure. A thread allocates a structure with three fields, then sets the global pointer gptr to point to this structure.. A key property of RCU is that readers can access a data structure even when it is in the process of being updated: RCU updaters cannot block readers or force them to retry their accesses.
Hotline file transfer connection 5517: Unofficial: Setiqueue Proxy server client for SETI@Home project 5550: Unofficial: Hewlett-Packard Data Protector [citation needed] 5554: Unofficial: Fastboot default wireless port 5555 Unofficial: Oracle WebCenter Content: Inbound Refinery—Intradoc Socket port. (formerly known as Oracle Universal Content ...