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On Feb 2 13:49, VÃclav Haisman wrote: > On 1 February 2016 at 08:38, Yaakov Selkowitz <yselkowitz@cygwin.com> wrote: > > On 2016-02-01 00:41, VÃclav Haisman wrote: > >> > >> On rakudo.org ([1]) pages, I have noticed that the pthread_barrier_* > >> POSIX API is missing from Cygwin. I took a look at NetBSD and FreeBSD > >> implementations of it. It seemed to me that creating POSIX barrier on > >> top of POSIX mutex and POSIX conditional variable is not that hard ([2]). > >> > >> Now, the question is whether this is acceptable and whether it should be > >> part of Newlib or directly part of Cygwin? > > > > > > IMO a barriers implementation would be welcome. winsup/cygwin/thread.cc > > would be the place for it. ACK > [...] > Well, I tried and I started adding the functions into the thread.cc > file (https://github.com/wilx/newlib-cygwin/commit/bf917b59d644eaac8fb5f72c5060bb44aa044804). > Then I noticed I do not know where to put the necessary structures. > Newlib headers seem to already contain some definitions of > pthread_barrier_t and pthread_barrierattr_t. The organization of the > source escapes me. The Cygwin pthread implementation is (unfortunately) completely separate from the newlib implementation. Therefore, ignore newlib for now and just look at the files under winsup/cygwin: - pthread.cc was supposed to contain external API calls but has been widely neglected at one point. Some rearrangement would certainly not hurt. - thread.cc contains the bulk of the pthread implementation. - thread.h contains local datatypes. - include/pthread.h is Cygwin's pthread header for the user space. It completely overrides newlib's include/pthread.h. HTH, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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