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TPF is an IBM real-time operating system for mainframe computers descended from the IBM System/360 family, including zSeries and System z9. The name is an initialism for Transaction Processing Facility. TPF delivers fast, high-volume, high-throughput transaction processing, handling large, continuous loads of essentially simple transactions across large, geographically dispersed networks. The world's largest TPF-based systems are easily capable of processing tens of thousands of transactions per second. TPF is also designed for highly reliable, continuous (24×7) operation. It is not uncommon for TPF customers to have continuous online availability of a decade or more, even with system and software upgrades. This is due in part to the multi-mainframe operating capability and environment. While there are other industrial-strength transaction processing systems, notably IBM's own CICS and IMS, TPF's ''raison d'être'' is extreme volume, large numbers of concurrent users and very fast response times, for example VISA credit card transaction processing during the peak holiday shopping season. The TPF passenger reservation application PARS, or its international version IPARS, is used by many airlines. One of TPF's major components is a high performance, specialized database facility called TPFDF. A close cousin of TPF, the transaction monitor ALCS, was developed by IBM to integrate TPF services into the more common mainframe operating system MVS, now z/OS. ==History== TPF evolved from the Airlines Control Program (ACP), a free package developed in the mid-1960s by IBM in association with major North American and European airlines. In 1979, IBM introduced TPF as a replacement for ACP — and as a priced software product. The new name suggests its greater scope and evolution into non-airline related entities. TPF was traditionally an IBM System/370 assembly language environment for performance reasons, and many TPF assembler applications persist. However, more recent versions of TPF encourage the use of C. Another programming language called SabreTalk was born and died on TPF. IBM announced the delivery of the current release of TPF, dubbed z/TPF V1.1, in September 2005. Most significantly, z/TPF adds 64-bit addressing and mandates use of the 64-bit GNU development tools. The GCC compiler and the DIGNUS Systems/C++ and Systems/C are the only supported compilers for z/TPF. The Dignus compilers offer reduced source code changes when moving from TPF 4.1 to z/TPF. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Transaction Processing Facility」の詳細全文を読む スポンサード リンク
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