[Bug nptl/16657] Lock elision breaks pthread_mutex_destroy

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16657

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The branch, azanella/lockelision-ppc has been created
        at  412d804e06543203a31c06988a809e7c88d06b2b (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=412d804e06543203a31c06988a809e7c88d06b2b

commit 412d804e06543203a31c06988a809e7c88d06b2b
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Wed Aug 20 15:50:58 2014 -0400

    PowerPC: abort transaction in syscalls

    Linux kernel powerpc documentation states issuing a syscall inside a
    transaction is not recommended and may lead to undefined behavior. It
    also states syscalls does not abort transactoin neither they run in
    transactional state.

    To avoid side-effects bein visible outside transactions, GLIBC with lock
    elision enable issues a transaction abort instruction just before all
    syscalls if hardware supports hardware transactions.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=25a5dad5f14f747577a5cffeafcd8bd5a52b31bf

commit 25a5dad5f14f747577a5cffeafcd8bd5a52b31bf
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Wed Jun 25 15:13:46 2014 -0400

    PowerPC: Add adaptive elision to rwlocks

    This patch adds support for lock elision using ISA 2.07 hardware
    transactional memory for rwlocks.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=00702011fff76cc94517889874359486995ef098

commit 00702011fff76cc94517889874359486995ef098
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Fri Mar 21 08:26:59 2014 -0400

    PowerPC: Adjusting LE mutex destroy

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5421cda51f0c177cad1757dd69b9319a1db7155c

commit 5421cda51f0c177cad1757dd69b9319a1db7155c
Author: Andreas Schwab <schwab@suse.de>
Date:   Thu Mar 27 16:50:04 2014 -0400

    Skip checks in pthread_mutex_destroy when doing elision

    When doing elisison the __nusers field is not updated, thus can have an
    arbitrary value.

        [BZ #16657]
        * nptl/pthread_mutex_destroy.c (__pthread_mutex_destroy): Skip
        checks when doing elision.
        * nptl/sysdeps/unix/sysv/linux/x86/pthread_mutex_destroy.c: New
        * file.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d3f269d75a82389717ddf041edadb0d4f8459dba

commit d3f269d75a82389717ddf041edadb0d4f8459dba
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Wed Aug 20 15:57:10 2014 -0400

    PowerPC: Add the low level infrastructure for pthreads lock elision

    This patch adds support for lock elision using ISA 2.07 hardware
    transactional memory instructions.

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