This change makes fork() go nearly as fast as sys_fork() on UNIX. As for
Windows this change shaves about 4-5ms off fork() + wait() latency. This
is accomplished by using WriteProcessMemory() from the parent process to
setup the address space of a suspended process; it is better than a pipe
This change introduces a new deadlock detector for Cosmo's POSIX threads
implementation. Error check mutexes will now track a DAG of nested locks
and report EDEADLK when a deadlock is theoretically possible. These will
occur rarely, but it's important for production hardening your code. You
don't even need to change your mutexes to use the POSIX error check mode
because `cosmocc -mdbg` will enable error checking on mutexes by default
globally. When cycles are found, an error message showing your demangled
symbols describing the strongly connected component are printed and then
the SIGTRAP is raised, which means you'll also get a backtrace if you're
using ShowCrashReports() too. This new error checker is so low-level and
so pure that it's able to verify the relationships of every libc runtime
lock, including those locks upon which the mutex implementation depends.
We now have implement all of Musl's localization code, the same way that
Musl implements localization. You may need setlocale(LC_ALL, "C.UTF-8"),
just in case anything stops working as expected.
I took one canonical IANA zone ID from each of the different colored
regions in this article, except those that do not observe DST and do
not have a Google office. See the "Time in Europe" Wikipedia article.
As to which canonical ID to use, this was somewhat arbitrary. Brussels
was obvious, as the de facto capital of the EU. For the rest, I mostly
just went with lexicographic ordering of the most recognizable options.
I've sorted the American zones. This Keeps the U.S. ones together but
does everything alphabetically otherwise. I've added the remaining
Canadian zones These have DST (and Newfoundland is off by a half-
hour from a UTC interval) so they cannot use Etc/. The Pacific/ zones
are sort of sorted. The Chathan Islands have been added. This is the
last of the zones I believe with a non-integer hour offset from UTC.
Cosmopolitan now supports 104 time zones. They're embedded inside any
binary that links the localtime() function. Doing so adds about 100kb
to the binary size. This change also gets time zones working properly
on Windows for the first time. It's not needed to have /etc/localtime
exist on Windows, since we can get this information from WIN32. We're
also now updated to the latest version of Paul Eggert's TZ library.
