It appears, from some quick googling, that createIndex enables multithreading in clang, which might explain this, depending on the threading libraries used.
Sam On Oct 19, 2014 9:24 AM, "Matthew Flatt" <[email protected]> wrote: > It appears that calling clang_createIndex() sets the handler for > SIGSEGV, which interferes with Racket's own SIGSEGV handler to > implement the GC's write barrier. > > The program below illustrates. It sets the handler before and after a > call to clang_createIndex() and shows that the handler has been changed > after the call. If you comment out the clang_createIndex() call, then > the handler is unchanged. > > I have no idea why clang_createIndex() would set the SIGSEGV handler or > whether that can be disabled. > > ---------------------------------------- > > #include <stdio.h> > #include <string.h> > #include <signal.h> > #include <sys/types.h> > #include <unistd.h> > > typedef void *CXIndex; > extern CXIndex clang_createIndex(int, int); > > void fault_handler() > { > printf("fault\n"); > } > > void check() > { > struct sigaction act, oact; > memset(&act, 0, sizeof(act)); > act.sa_sigaction = fault_handler; > sigemptyset(&act.sa_mask); > sigaction(SIGSEGV, &act, &oact); > > printf("%p %d\n", oact.sa_sigaction, oact.sa_sigaction == fault_handler); > } > > int main() { > void *dl; > > check(); > > clang_createIndex(0, 0); > > check(); > > return 0; > } > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users >
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