Yes, unfortunately it does not seem to matter. The bug is present also with c99 -D_XOPEN_SOURCE=600
spdev@SPs-Mac ~ % uname -a && rm -f ./a.out && c99 -D_XOPEN_SOURCE=600 cancel_leak.c && while true; do time ./a.out 100000000 10; done Darwin SPs-Mac.local 19.0.0 Darwin Kernel Version 19.0.0: Wed Sep 25 20:18:50 PDT 2019; root:xnu-6153.11.26~2/RELEASE_X86_64 x86_64 Starting test, 100000000 iterations, sleep interval 10ms cancel_leak.c:46: ERROR cancelled while PTHREAD_CANCEL_DISABLE zsh: illegal hardware instruction ./a.out 100000000 10 ./a.out 100000000 10 21.47s user 112.79s system 1% cpu 2:32:32.73 total Starting test, 100000000 iterations, sleep interval 10ms cancel_leak.c:46: ERROR cancelled while PTHREAD_CANCEL_DISABLE zsh: illegal hardware instruction ./a.out 100000000 10 ./a.out 100000000 10 6.85s user 34.88s system 1% cpu 1:08:58.65 total Starting test, 100000000 iterations, sleep interval 10ms cancel_leak.c:46: ERROR cancelled while PTHREAD_CANCEL_DISABLE zsh: illegal hardware instruction ./a.out 100000000 10 ./a.out 100000000 10 10.77s user 56.04s system 1% cpu 1:11:28.98 total Starting test, 100000000 iterations, sleep interval 10ms cancel_leak.c:46: ERROR cancelled while PTHREAD_CANCEL_DISABLE zsh: illegal hardware instruction ./a.out 100000000 10 ./a.out 100000000 10 1.42s user 7.13s system 1% cpu 9:10.69 total ... > On 21 Oct 2019, at 13:21, Geoff Clare <g...@opengroup.org> wrote: > > Per Mildner <per.mild...@ri.se> wrote, on 21 Oct 2019: >> >> As far as I know, no version of macOS, including macOS version 10.15 >> Catalina, has implemented thread cancellation correctly (the first few >> certified version did not implement it at all, the more recent ones >> implement it incorrectly). >> >> https://openradar.appspot.com/9137682 >> <https://openradar.appspot.com/9137682>, first reported to Apple in 2011, >> shows that PTHREAD_CANCEL_DISABLE does not prevent pthread_cancel from >> cancelling a thread. This is still true in Catalina. This makes thread >> cancellation unreliable, and there is no workaround that I know of. >> >> I do not think that a working PTHREAD_CANCEL_DISABLE is optional in UNIX 03, >> but I may be mistaken. > > The report at openradar shows compilations with cc and gcc. To ensure > conforming behaviour you need to compile with c99 -D_XOPEN_SOURCE=600 > (where c99 is the macOS front-end to clang). > > Do you get the same result if you compile that way? > > -- > Geoff Clare <g.cl...@opengroup.org> > The Open Group, Apex Plaza, Forbury Road, Reading, RG1 1AX, England > Per Mildner RISE ICT/SICS
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