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Bus snooping or bus sniffing is a scheme by which a coherency controller (snooper) in a cache (a snoopy cache) monitors or snoops the bus transactions, and its goal is to maintain a cache coherency in distributed shared memory systems. This scheme was introduced by Ravishankar and Goodman in 1983, under the name "write-once" cache coherency. [1]
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.
Oracle Service Bus (abbreviated OSB) is an enterprise service bus used by Oracle Corporation. Formerly named AquaLogic Service Bus, Oracle acquired this technology when it bought BEA Systems . [ 1 ] [ 2 ] [ 3 ]
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.
Requested action not taken. File unavailable (e.g., file not found, no access). 551: Requested action aborted. Page type unknown. 552: Requested file action aborted. Exceeded storage allocation (for current directory or dataset). 553: Requested action not taken. File name not allowed. 600 Series: Replies regarding confidentiality and integrity: 631
In AmigaOS, a lock on a file (or directory) can be acquired using the Lock function (in the dos.library). A lock can be shared (other processes can read the file/directory, but can't modify or delete it), or exclusive so that only the process which successfully acquires the lock can access or modify the object.
PrWr: The processor requests to write a Cache block; Bus side requests are the following: BusRd: Snooped request that indicates there is a read request to a Cache block requested by another processor; BusRdX: Snooped request that indicates there is a write request to a Cache block requested by another processor that doesn't already have the block.