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This probably belongs at cygwin-dev, but it sounds interesting (especially if it allows less-frequent invocation of the rebaseall ritual).posix_spawn [1] is an optional POSIX facility that allows programs to start other programs without using fork or vfork. I've created an efficient implementation of posix_spawn for Cygwin. The code is available at https://github.com/dcolascione/cygspawn.
This library uses Cygwin's nonstandard spawn* family calls in process.h to provide the full suite of posix_spawn* functionality. Implementing posix_spawn in terms of spawn turns out to be non-trivial. Nevertheless, using posix_spawn can improve process startup performance considerably, especially for large programs:
Regards, Ryan
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