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Date: | Sat, 20 Jun 2015 22:55:12 +0200 |
From: | Corinna Vinschen <corinna-cygwin AT cygwin DOT com> |
To: | cygwin AT cygwin DOT com |
Subject: | [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.1.0-0.1 |
Message-Id: | <announce.20150620205512.GA28301@calimero.vinschen.de> |
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Hi Cygwin friends and users, I released a TEST version of Cygwin. The version number is 2.1.0-0.1. This test release is mostly for interested *developers*. The important news which needs some testing is the implementation of sigaltstack(2) and the underlying implementation of running a signal handler on the alternate signal stack. Implementation details: - The alternate signal stack installed via sigaltstack is only valid for the current thread. Each thread must call its own sigaltstack. On pthread_create, the alternate signal stack setting of the calling thread is *not* propagated to the newly created thread. This follows current Linux semantics. - The alternate signal stack is a minimal stack. Certain datastructures used by Cygwin (_cygtls area) and Windows (on 32 bit: exception records) are not copied over to the alternate signal stack. The stack settings in the Thread Environment Block (TEB) are not reflecting the current alternate stack while running the signal handler. The TEB will still point to the original thread stack. This seems to work nicely in my testing, but there may be Windows functions which stop working in this scenario. - The 32 bit version stores the original stack register content at the base of the alternate stack. If you screw this up while running the signal handler, your thread is doomed on return to the caller. - The 64 bit version stores the information in callee-saved registers r12 and r13 per MS-ABI. I'd be grateful if curious developers would give this new sigaltstack implementation a whirl and report back if it's working for them as desired/expected. And if not, simple reproducers in plain C are most welcome in this case. Discussing aspects of this implementation may be best handled on the cygwin-developers mailing list or the #cygwin-developers IRC channel on Freenode. All changes in this release so far: =================================== What's new: ----------- - First cut of an implementation to allow signal handlers running on an alternate signal stack. - New API sigaltstack, plus definitions for SA_ONSTACK, SS_ONSTACK, SS_DISABLE, MINSIGSTKSZ, SIGSTKSZ. - New API: sethostname. Bug Fixes --------- - Enable non-SA_RESTART behaviour on threads other than main thread. Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00260.html - Try to handle concurrent close on socket more gracefully Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00235.html To install 32-bit Cygwin use https://cygwin.com/setup-x86.exe To install 64 bit Cygwin use https://cygwin.com/setup-x86_64.exe Have fun, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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