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What's new:
-----------
- Revamped pseudo console support.
- New C11 threads API: call_once, cnd_broadcast, cnd_destroy, cnd_init,
cnd_signal, cnd_timedwait, cnd_wait, mtx_destroy, mtx_init, mtx_lock,
mtx_timedlock, mtx_trylock, mtx_unlock, thrd_create, thrd_current,
thrd_detach, thrd_equal, thrd_exit, thrd_join, thrd_sleep, thrd_yield,
tss_create, tss_delete, tss_get, tss_set.
- In cygwin console, new thread which handles special keys/signals such
as Ctrl-Z (VSUSP), Ctrl-\ (VQUIT), Ctrl-S (VSTOP), Ctrl-Q (VSTART) and
SIGWINCH has been introduced. There have been a long standing issue
that these keys/signals are handled only when app calls read() or
select(). Now, these work even if app does not call read() or select().
What changed:
-------------
- Allow ~5000 child processes per process on 64 bit, ~1200 child processes
per process on 32 bit. So far, only 256 child processes per process were
supported.
- A few FAQ updates.
- Have tmpfile(3) make use of Win32 FILE_ATTRIBUTE_TEMPORARY via open(2)
flag O_TMPFILE.
Addresses: https://cygwin.com/pipermail/cygwin/2021-January/247304.html
Bug Fixes
---------
- Iterate at least 4 times over pthread_key_t destructors per POSIX.
- The pthread_yield declaration in pthread is now visible by default
or when defining _BSD_SOURCE, too.
- Fix SEGV in modfl call.
Addresses: https://cygwin.com/pipermail/cygwin/2020-August/246056.html
- Fix a collision of offical and internally used file flags.
Addresses: https://cygwin.com/pipermail/cygwin/2020-September/246174.html
- Fix assertion failure on an invalid path under /proc/<pid>/fd/.
Addresses: https://cygwin.com/pipermail/cygwin/2020-September/246160.html
- Fix crash on stat(2)'ing /dev/ptmx on 32 bit.
Addresses: https://cygwin.com/pipermail/cygwin/2020-September/246218.html
- Fix return value of sqrtl on negative infinity.
Addresses: https://cygwin.com/pipermail/cygwin/2020-October/246606.html
- Fix a path handling problem if there is a WSL symlink in PATH.
Addresses: https://cygwin.com/pipermail/cygwin/2020-December/246938.html
- Fix a bug in fstatat(2) on 32 bit that could cause it to return garbage.
Addresses: https://cygwin.com/pipermail/cygwin/2021-January/247399.html
- Fix the errno when a path contains .. and the prefix exists but is
not a directory.
Addresses: https://lists.gnu.org/archive/html/bug-gnulib/2021-01/msg00214.html
- Fix the return value when ptsname_r(3) is called with a bad file descriptor
Addresses: https://lists.gnu.org/archive/html/bug-gnulib/2021-01/msg00245.html
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