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はじめにThe 'sync' extension introduces cross-platform synchonization objects into PHP. Named and unnamed Mutex, Semaphore, Event, Reader-Writer, and named Shared Memory objects provide OS-level synchronization on both POSIX (e.g. Linux) and Windows platforms. Automatic cleanup of acquired synchronization objects takes place during extension teardown. This means that if PHP prematurely terminates a script (e.g. script execution time is exceeded), objects will not be left in an unknown state. The only exception to this is if PHP itself crashes (e.g. an internal buffer overflow). Unnamed synchronization objects don't have a lot of use outside of a multithreaded scenario. Unnamed objects are more useful in conjunction with the pthreads PECL extension.
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