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Implement support for POSIX thread cancellations

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This change makes some miracle modifications to the System Five system
call support, which lets us have safe, correct, and atomic handling of
thread cancellations. It all turned out to be cheaper than anticipated
because it wasn't necessary to modify the system call veneers. We were
able to encode the cancellability of each system call into the magnums
found in libc/sysv/syscalls.sh. Since cancellations are so waq, we are
also supporting a lovely Musl Libc mask feature for raising ECANCELED.
This commit is contained in:
Justine Tunney 2022-11-04 01:04:43 -07:00
parent 37d40e087f
commit 2278327eba
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GPG key ID: BE714B4575D6E328
145 changed files with 715 additions and 265 deletions
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3
libc/sysv/consts.sh
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@ -168,9 +168,10 @@ syscon sig SIGPROF 27 27 27 27 27 27 # profiling timer expired;
syscon sig SIGWINCH 28 28 28 28 28 28 # terminal resized; unix consensus & faked on nt
syscon sig SIGIO 29 23 23 23 23 29 # bsd consensus
syscon sig SIGSYS 31 12 12 12 12 31 # wut; bsd consensus
syscon sig SIGINFO 0 29 29 29 29 0 # bsd consensus
syscon sig SIGEMT 0 7 7 7 7 0 # not implemented in most community editions of system five; consider doing this using SIGUSR1 or SIGUSR2 instead
syscon sig SIGPWR 30 30 30 30 32 30 # not implemented in most community editions of system five; consider doing this using SIGUSR1 or SIGUSR2 instead
syscon sig SIGINFO 0 29 29 29 29 0 # bsd consensus
syscon sig SIGCANCEL 32 7 65 7 33 32 # SIGRTMIN+0; faked as SIGEMT on XNU and OpenBSD
syscon sig SIGRTMIN 32 0 65 0 33 32
syscon sig SIGRTMAX 64 0 126 0 63 64
syscon compat SIGPOLL 29 23 23 23 23 29 # same as SIGIO