Commit Graph

120 Commits

Author SHA1 Message Date
Giacomo Tesio 1bc08b7631 kernel: rendezvous(~0, ...) unconditionally blocks
This commit introduce a special rendezvous point at (void*)~0 that
cannot be reached by any process, since it's not added to the
rendezvous group.

This turns the rendezvous syscall to a cheap way to block until
either a note or a wakeup from awake(2) occurs.

This new feature is used in libc's sleep: the test qa/kern/fork_chain
has shown that using a stack address as rendezvous point is not safe enougth
for sleep, since two different process forked from the same function can
call sleep with the same base pointer. This lead the wakeup variable in
jehanne_sleep to have the same address on both process.

TODO add a test that show this behaviour in the old code.
2017-07-21 01:49:00 +02:00
Giacomo Tesio c13d386ab5 libaml: import 9front's improvements 2017-07-21 01:34:34 +02:00
Giacomo Tesio 83e3161789 kernel: fix ancient bug in GDT initialization 2017-06-08 04:03:32 +02:00
Giacomo Tesio 4f97f4a80b qa: disable broken tests 2017-06-05 22:11:36 +02:00
Giacomo Tesio 87de13f1e0 kernel: mmuptpcheck: use less global memory 2017-05-31 01:10:18 +02:00
Giacomo Tesio 7108477c32 kernel: simplify mmuput 2017-05-30 22:41:44 +02:00
Giacomo Tesio 28c426055d libposix: fix disposition for signals that are ignored by default 2017-05-30 01:15:25 +02:00
Giacomo Tesio 6bd285bdaa libposix: fix SIGCLD disposition; use PosixSIGCHLD to identify the signal when SIGCHLD == SIGCLD 2017-05-30 00:49:28 +02:00
Giacomo Tesio c45cffeaf5 cmd: fix ancient bug on consolefs flush 2017-05-30 00:11:34 +02:00
Giacomo Tesio e525113266 libposix: cleanups 2017-05-29 23:27:30 +02:00
Giacomo Tesio d1e285f721 libposix: honor SIG_IGN by doing nothing (DRAFT) 2017-05-29 02:04:48 +02:00
Giacomo Tesio f6d44667f2 libposix: fix bind #p and POSIX_kill sigrtmin/sigrtmax usage 2017-05-29 01:11:07 +02:00
Giacomo Tesio 40ccb89835 libc: simplify Waitmsg 2017-05-26 01:55:09 +02:00
Giacomo Tesio ac9969dadd libposix: fix signals when no realtime signal is supported 2017-05-26 00:27:48 +02:00
Giacomo Tesio abfc6958d6 libposix: build again 2017-05-25 22:42:20 +02:00
Giacomo Tesio a59b992ed4 libposix: more code for signals 2017-05-25 01:04:53 +02:00
Giacomo Tesio 68bc46fe85 libposix: initial changes to POSIX_kill 2017-05-24 00:40:28 +02:00
Giacomo Tesio 3381f75d03 libposix: fix typo 2017-05-24 00:08:00 +02:00
Giacomo Tesio 3307c1e7e2 libposix: drafted Child structure 2017-05-24 00:04:30 +02:00
Giacomo Tesio e0610f6b71 libposix: drafted SIGCHLD management 2017-05-23 00:27:50 +02:00
Giacomo Tesio c27b2aa93b kern: remove unused l64acidt.S 2017-05-22 00:45:03 +02:00
Giacomo Tesio cc595c7c99 kernel: save and restore all registers on syscall 2017-05-21 00:15:51 +02:00
Giacomo Tesio 4b7957a28f kernel: simplify init code 2017-05-20 14:06:26 +02:00
Giacomo Tesio aedc31e925 libstdio: fix uninitialized variables 2017-05-19 01:33:09 +02:00
Giacomo Tesio 3b4af1e4d8 gcc: enable -O2 compilation
To enable -O2 compilation we have to disable some optimizations:

- strict-aliasing (TODO: introduce required unions to enable this)
- aggressive-loop-optimizations
- array-bounds

Affected builds are

- sys/src/cmd/dossrv/build.json
- sys/src/cmd/ip/build.json
- sys/src/lib/authsrv/build.json
- sys/src/lib/memdraw/build.json
2017-05-19 01:15:34 +02:00
Giacomo Tesio 901962f6c9 cmds: avoid duplicated compilation of ip tools 2017-05-19 00:54:23 +02:00
Giacomo Tesio 22d90985a5 kernel: awake() wake up only truly blocking syscalls
If a syscall did not entered sleep(), the pendingWakeup is not consumed.
2017-05-17 02:04:08 +02:00
Giacomo Tesio 1dc8991331 kernel: reset and restore up->cursyscall in trap
This way sleep() knows that it should not interrupt the process
to serve awake().

Also rename Proc.insyscall to Proc.inkernel since that's the meaning
of the flag, which is only read to serve awake()'s mechanics and
to accounttime(). Indeed faultAmd64 was setting insyscall to 1.
2017-05-17 01:16:49 +02:00
Giacomo Tesio 2b1baf8de1 kernel: devpipe: fix error management on writes
The "write on closed pipe" note should be posted only
if the write occurred on a closed pipe.

Before this fix, on any interrupt caused the note to be sent,
despite the pipe being open and fully working.
2017-05-17 00:27:57 +02:00
Giacomo Tesio 031201a1ac kernel: reset process wakeups on exec 2017-05-15 00:35:22 +02:00
Giacomo Tesio f9b2e9aba4 kernel: generalize awake
Awake can now interrupt several blocking syscalls (even
during note handling).

Among others, it can interrupt await, pread and pwrite.

It cannot interrupt several others for different reasons:

- awake cannot be interrupted by awake;
- syscalls like remove and create can be used for kernel comunication
  and it would be hard to know if the effect occurred in the
  receiving fs if they were interrupted;
- other syscalls do not need awake since they just provide access
  to kernel infos (eg seek or fd2path)

NOTE: awakes registered before a note cannot occur during the note
handling and will be deferred till the next call to noted.
2017-05-15 00:05:59 +02:00
Giacomo Tesio 79f8204766 kern: move tsemaquire to userspace (given a generalized awake) 2017-05-12 11:13:19 +02:00
Giacomo Tesio 46664994d4 libposix: fix usleep 2017-05-12 11:13:08 +02:00
Giacomo Tesio aa4172a1de libposix: document timers 2017-05-08 23:46:19 +02:00
Giacomo Tesio a3791c88f7 libposix: add usleep 2017-05-08 23:45:46 +02:00
Giacomo Tesio d62ca1162f Merge branch 'libposix-new-signals' of https://bitbucket.org/tesio/jehanne into libposix-new-signals 2017-05-08 22:54:34 +02:00
Giacomo Tesio edc116ef45 libposix: documented new signal machinery 2017-05-08 00:43:35 +02:00
Giacomo Tesio 333d5dcbcd Merge branch 'master' into libposix-new-signals 2017-05-07 19:44:47 +02:00
Giacomo Tesio b08218529d devproc: can't wait for up to stop 2017-05-06 16:03:16 +02:00
Giacomo Tesio 8d5eb5914f libposix: fix default_signal_disposition 2017-05-06 13:33:08 +02:00
Giacomo Tesio da0381a213 libposix: big refactor of signal handling 2017-05-05 19:01:18 +02:00
Giacomo Tesio d29859684b libposix: complete POSIX_signal_execute 2017-05-03 03:02:56 +02:00
Giacomo Tesio bd5063666f libposix: introduce POSIX_signal_execute and PosixSignalDisposition enum 2017-05-03 01:14:53 +02:00
Giacomo Tesio cf974abe0e libposix: (almost working) waitpid 2017-05-02 00:57:18 +02:00
Giacomo Tesio 8c33c921b4 libposix: draft waitpid (still broken) 2017-05-01 23:57:05 +02:00
Giacomo Tesio 14934ee51f libposix: sleep and pipe 2017-04-30 16:49:50 +02:00
Giacomo Tesio 3707eaece6 libposix: simplify kill 2017-04-30 16:49:01 +02:00
Giacomo Tesio ac33157c37 kern: usbehcipc.c fix CID 155940: Out-of-bounds write 2017-04-25 16:07:47 +02:00
Giacomo Tesio 80a8501c05 kern/ip/gre: fix CID 156224: Uninitialized scalar variable 2017-04-25 15:53:20 +02:00
Giacomo Tesio ea6f34f4f7 kern: mark pexit() as noreturn
Since pexit() calls sched() it wont return to the caller.
Should fix

- CID 155655: Missing break in switch
- CID 155672: Missing break in switch
2017-04-24 09:55:45 +02:00