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POSIX Threads, usually referred to as Pthreads, is an example of an execution model that exists independently from a language, as well as an example of a parallel execution model. It allows a program to control multiple different flows of work that overlap in time. Each flow of work is referred to as a Thread, and creation and control over these flows is achieved by making calls to the POSIX Threads API. POSIX Threads is a POSIX standard for threads. The standard, ''POSIX.1c, Threads extensions (IEEE Std 1003.1c-1995)'', defines an API for creating and manipulating threads. Implementations of the API are available on many Unix-like POSIX-conformant operating systems such as FreeBSD, NetBSD, OpenBSD, Linux, Mac OS X and Solaris. DR-DOS and Microsoft Windows implementations also exist: within the SFU/SUA subsystem which provides a native implementation of a number of POSIX APIs, and also within third-party packages such as ''pthreads-w32'',〔(【引用サイトリンク】 title=Pthread Win-32: Level of standards conformance )〕 which implements pthreads on top of existing Windows API. ==Contents== Pthreads defines a set of C programming language types, functions and constants. It is implemented with a pthread.h header and a thread library. There are around 100 Pthreads procedures, all prefixed "pthread_" and they can be categorized into four groups: *Thread management - creating, joining threads etc. *Mutexes *Condition variables *Synchronization between threads using read/write locks and barriers The POSIX semaphore API works with POSIX threads but is not part of threads standard, having been defined in the ''POSIX.1b, Real-time extensions (IEEE Std 1003.1b-1993)'' standard. Consequently the semaphore procedures are prefixed by "sem_" instead of "pthread_". 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「POSIX Threads」の詳細全文を読む スポンサード リンク
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