I did understand the purpose of the thread mask code in libexec/rtld/rtld_lock.c, or, more precisely, the condition where this code works (for the context, see the mails with same subject on freebsd-hackers).
Look, that code assumes that blocking async signals would stop thread scheduler from doing preemption of the current thread. This works for libc_r, but fails in libpthread and libthr cases. libpthread provides implementation of the locks for rtld. But libthr does not ! As result, rtld exhibit races when used with libthr. In other words, libthr needs code to do proper locking. Do you agree ? Does somebody already planned to do this work ? Best regards, Kostik Belousov
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