By Abraham Silberschatz
Celebrating its twentieth anniversary, Silberschatz: working structures recommendations, 6th variation, keeps to supply a superior theoretical origin for knowing working structures. The 6th version deals more advantageous conceptual insurance and extra content material to bridge the space among innovations and genuine implementations. Threads has been further to this most up-to-date variation and contains insurance of Pthreads and Java threads. All code examples were rewritten and at the moment are in C. elevated insurance of small footprint working structures reminiscent of PalmOS and real-time working method, in addition to a brand new bankruptcy on home windows 2000, were added.
Market: machine Scientists; Programmers.
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Celebrating its twentieth anniversary, Silberschatz: working platforms strategies, 6th variation, keeps to supply a superb theoretical starting place for figuring out working platforms. The 6th version deals greater conceptual insurance and extra content material to bridge the space among suggestions and real implementations.
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Extra info for Operating System Concepts, 6th Edition
Buffers not recently used, or without valid contents (AGE list). ✦ EMPTY buffers with no associated physical memory. ■ When a block is wanted from a device, the cache is searched. ■ If the block is found it is used, and no I/O transfer is necessary. ■ If it is not found, a buffer is chosen from the AGE list, or the LRU list if AGE is empty. ) ■ Buffer cache size effects system performance; if it is large enough, the percentage of cache hits can be high and the number of actual I/O transfers low.
Allocation of both main memory and swap space is done first-fit. ) ■ Sharable text segments do not need to be swapped; results in less swap traffic and reduces the amount of main memory required for multiple processes using the same text segment. ■ The scheduler process (or swapper) decides which processes to swap in or out, considering such factors as time idle, time in or out of main memory, size, etc. 3BSD, swap space is allocated in pieces that are multiples of power of 2 and minimum size, up to a maximum size determined by the size or the swap-space partition on the disk.
57 Silberschatz, Galvin and Gagne 2002 Socket Types ■ Stream sockets provide reliable, duplex, sequenced data ■ ■ ■ ■ streams. Supported in Internet domain by the TCP protocol. In UNIX domain, pipes are implemented as a pair of communicating stream sockets. Sequenced packet sockets provide similar data streams, except that record boundaries are provided. Used in XEROX AF_NS protocol. Datagram sockets transfer messages of variable size in either direction. Supported in Internet domain by UDP protocol Reliably delivered message sockets transfer messages that are guaranteed to arrive.