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Previously, a deadlock happened if many SIGSTOP/SIGCONT signals were received rapidly. If the main thread sends __SIGFLUSH at the timing when SIGSTOP is handled by the sig thread, but not is handled by the main thread yet (sig_handle_tty_stop() not called yet), and if SIGCONT is received, the sig thread waits for cygtls::current_sig (is SIGSTOP now) cleared. However, the main thread waits for the pack.wakeup using WaitForSingleObject(), so the main thread cannot handle SIGSTOP. This is the mechanism of the deadlock. This patch uses cygwait() instead of WaitForSingleObject() to be able to handle the pending SIGSTOP. Addresses: https://cygwin.com/pipermail/cygwin/2024-November/256744.html Fixes: 7759daa979c4 ("(sig_send): Fill out sigpacket structure to send to signal thread rather than racily sending separate packets.") Reported-by: Christian Franke <Christian.Franke@t-online.de> Reviewed-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.
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