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Implement pthread_atfork()

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If threads are being used, then fork() will now acquire and release and
runtime locks so that fork() may be safely used from threads. This also
makes vfork() thread safe, because pthread mutexes will do nothing when
the process is a child of vfork(). More torture tests have been written
to confirm this all works like a charm. Additionally:

- Invent hexpcpy() api
- Rename nsync_malloc_() to kmalloc()
- Complete posix named semaphore implementation
- Make pthread_create() asynchronous signal safe
- Add rm, rmdir, and touch to command interpreter builtins
- Invent sigisprecious() and modify sigset functions to use it
- Add unit tests for posix_spawn() attributes and fix its bugs

One unresolved problem is the reclaiming of *NSYNC waiter memory in the
forked child processes, within apps which have threads waiting on locks
This commit is contained in:
Justine Tunney 2022-10-16 12:05:08 -07:00
parent 64c284003d
commit 60cb435cb4
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GPG key ID: BE714B4575D6E328
124 changed files with 2169 additions and 718 deletions
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26
libc/sysv/consts.sh
View file

@ -1107,32 +1107,6 @@ syscon pf PF_VSOCK 40 0 0 0 0 0
syscon pf PF_WANPIPE 25 0 0 0 0 0
syscon pf PF_X25 9 0 0 0 0 0
# Eric Allman's exit() codes
#
# - Broadly supported style guideline;
# - Dating back to 1980 in 4.0BSD;
# - That won't be standardized.
#
# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary
syscon ex EX_OK 0 0 0 0 0 0 # consensus
syscon ex EX_USAGE 64 64 64 64 64 64 # unix consensus & force NT
syscon ex EX_DATAERR 65 65 65 65 65 65 # unix consensus & force NT
syscon ex EX_NOINPUT 66 66 66 66 66 66 # unix consensus & force NT
syscon ex EX_NOUSER 67 67 67 67 67 67 # unix consensus & force NT
syscon ex EX_NOHOST 68 68 68 68 68 68 # unix consensus & force NT
syscon ex EX_UNAVAILABLE 69 69 69 69 69 69 # unix consensus & force NT
syscon ex EX_SOFTWARE 70 70 70 70 70 70 # unix consensus & force NT
syscon ex EX_OSERR 71 71 71 71 71 71 # unix consensus & force NT
syscon ex EX_OSFILE 72 72 72 72 72 72 # unix consensus & force NT
syscon ex EX_CANTCREAT 73 73 73 73 73 73 # unix consensus & force NT
syscon ex EX_IOERR 74 74 74 74 74 74 # unix consensus & force NT
syscon ex EX_TEMPFAIL 75 75 75 75 75 75 # unix consensus & force NT
syscon ex EX_PROTOCOL 76 76 76 76 76 76 # unix consensus & force NT
syscon ex EX_NOPERM 77 77 77 77 77 77 # unix consensus & force NT
syscon ex EX_CONFIG 78 78 78 78 78 78 # unix consensus & force NT
syscon ex EX__BASE 64 64 64 64 64 64 # unix consensus & force NT
syscon ex EX__MAX 78 78 78 78 78 78 # unix consensus & force NT
# getdents() constants
#
# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary