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* posix_ipc.cc: Include thread.h and semaphore.h. Remove TODO comment. (ipc_names): Add max_len member. Set to maximum length of the path before tacking on the prefix path. Set prefix path for named semaphors to /dev/shm, as on Linux. (enum ipc_type_t): Change sem to semaphore to avoid name conflicts. (check_path): Detect empty paths. Use ipc_names's max_len member. Use __small_sprintf to create full object path name. Special case semaphores. (ipc_cond_init): Drop superfluous strcpy. (class ipc_flock): New class to simplify file locking in subsequent code. (struct mq_hdr): Raise size of mqh_uname to allow adding a unique LUID to the name. (mq_open): Fix formatting. Create unique synchronization object names using AllocateLocallyUniqueId. (struct sem_finfo): New structure defining named semaphore file content. (sem_open): Move here. Rework implementation to allow kernel persistent implementation of POSIX named semaphores. (_sem_close): Implement sem_close. (sem_close): Move here. Just call _sem_close with do_close parameter set to true. (sem_unlink): New function. * pthread.cc (mangle_sem_name): Remove. (sem_open): Move to posix_ipc.cc. (sem_close): Ditto. * syscalls.cc (close_all_files): Call semaphore::terminate here. * thread.cc: Fix formatting. Rearrange semaphore functions so that they are close together. (semaphore::semaphore): Rework to play nicely with new named semaphore implementation. (semaphore::_terminate): Call _sem_close if semaphore is a named semaphore. (semaphore::destroy): Don't destroy named semaphores. Return EINVAL instead. (semaphore::close): Only destroy named semaphores. Return EINVAL otherwise. (semaphore::open): Rework to play nicely with new named semaphore implementation. Loop through existing semaphores to be able to return same sem_t pointer as a former call on the same named semaphore. (semaphore::getinternal): New function called from _sem_close. * thread.h (class List): Make mx and head public. (class semaphore): Fix formatting. Align method declarations with implementation in thread.cc. Add members used for named semaphores. (semaphore::terminate): New static method. * include/semaphore.h: Redefine SEM_FAILED. Fix formatting. (sem_unlink): Add declaration. * include/cygwin/version.h: Bump API minor number.