Preempted threads are now removed from the runnable list until every
other thread has been preempted or the system goes idle. This ensures
threads that roundtrip to other threads get a full chance to perform
their work cooperatively without being starved by CPU intensive threads
whenever they yield.
Waiting for any non-zero duration currently waits for at least one timer
cycle (10 ms), which is especially expensive during early boot.
The current workaround of simply reading the status 14 times seems really
suspicious although the osdev wiki documents it, but let's see how well it
works on real hardware, it's probably good enough.
Try to determine the initial selected drive to save one drive selection.
The -Wpedantic warnings are only supported in C <signal.h> mode, but the GCC
build and other ports use this kinda-unsupported mode and produce a lot of
these needless warnings, so remove the trailing commas in the enums.
The .tix.tar.xz binary package format now stores the contents in the root
rather than the data/ subdirectory and the tix metadata now has the same
layout as the loose files in /tix, such that a .tix.tar.xz package can
simply be directly extracted into the filesystem. The /tix/manifest/ is now
included in the binary package rather than being generated on installation.
The /tix/collection.conf and /tix/tixinfo metadata files are now in the
tix-vars(1) format in the style of port(5).
The /tix/installed.list file has been removed since it isn't loose file
compatible and one can list the /tix/tixinfo directory instead.
The /tix/repository.list file has been removed since the feature is unused
and doesn't match the future direction of tix.
The kernel support for tix binary packages has been removed since it will
simply install by extracting the tar archive into the root filesystem.
Add the post-install sha256sum to the port version stamp.
The custom initrd format was originally useful when it was mounted,
however it has been extracted into the ramfs for a very long time and
has no advantages over the standard tar format which can be readily
created and modified using standard tools. The kernel initrd(7) support
already supports tar, so this change simply switches the format.
This change adds all the kernel parts of a network stack. The network stack
is partial but implements many of the important parts.
Add if(4) network interface abstraction. Network interfaces are registered
in a global list that can be iterated and each assigned an unique integer
identifier.
Add reference counted packets with a cache that recycles recent packets.
Add support for lo(4) loopback and ether(4) ethernet network interfaces.
The /dev/lo0 loopback device is created automatically on boot.
Add arp(4) address resolution protocol driver for translation of inet(4)
network layer addresses into ether(4) link layer addresses. arp(4) entries
are cached and evicted from the cache when needed or when the entry has not
been used for a while. The cache is limited to 256 entries for now.
Add ip(4) internet protocol version 4 support. IP fragmentation and options
are not implemented yet.
Add tcp(4) transmission control protocol sockets for a reliable transport
layer protocol that provides a reliable byte stream connection between two
hosts. The implementation is incomplete and does not yet implement out of
band data, options, and high performance extensions.
Add udp(4) user datagram protocol sockets for a connectionless transport
layer that provides best-effort delivery of datagrams.
Add ping(4) sockets for a best-effort delivery of echo datagrams.
Change type of sa_family_t from unsigned short to uint16_t.
Add --disable-network-drivers to the kernel(7) options and expose it with a
bootloader menu. tix-iso-bootconfig can set this option by default.
Import CRC32 code from libz for the Ethernet checksum.
This is a compatible ABI change that adds features to socket(2) (AF_INET,
IPPROTO_TCP, IPPROTO_UDP, IPPROTO_PING), the ioctls for if(4), socket
options, and the lo0 loopback interface.
This commit is based on work by Meisaka Yukara contributed as the commit
bbf7f1e8a5238a2bd1fe8eb1d2cc5c9c2421e2c4. Almost no lines of this work
remains in this final commit as it has been rewritten or refactored away
over the years, see the individual file headers for which files contain
remnants of this work.
Co-authored-by: Meisaka Yukara <Meisaka.Yukara@gmail.com>
The futex and kutex implementations used the same linked list for waiting,
however the futex implementation used kutexs and the same thread could be in
the same list twice in the case of contention. This case corrupted the wait
lists and led to deadlocks and lost wakeups. This change fixes the problem
by having separate data structures for futexes and kutexes.
Mutexes contended by multiple threads could lead to lost wakeups since only
one contended thread was awoken and subsequent unlocks are unaware of the
unawakened contended threads. This change fixes the problem with a temporary
solution of waking all the contended threads until a better design is
implemented.
Additional details are tweaked to be more reliable and simpler.
This change makes all the standard library and kernel headers use header
guards with a consistent scheme within the reserved namespace to avoid
conflicts with non-standard-library-implementation code.
Previously, sys_dup() would do dtable->Get() on the passed in-file
descriptor and then pass the result directly to dtable->Allocate(). If
the file descriptor is not valid, dtable->Get() returns a NULL reference
and sets errno to mark the error. Since sys_dup() did not check the
return value of dtable->Get() and dtable->Allocate() does not check
whether the passed in Ref<Descriptor> is a NULL reference, dup(2) with
invalid file descriptor would succesfully allocate a new file descriptor
with garbage contents.
This commit changes sys_dup() to use a variant of dtable->Allocate()
that takes in a file descriptor as an integer and properly validates it
before use.
Jonas 'Sortie' Termansen
Juhani Krekelä
auronandace