std::call_once without TLS

[Jonathan Wakely]

2009/4/4 Jonathan Wakely:
>> A build with --disable-tls causes this new test to fail in
>> unique_lock::lock() when a second thread tries to lock the global
>> mutex that is already locked.
>>
>> Tested x86-64-unknown-linux-gnu with --disable-tls, ok for trunk and 4.4?


Patch updated for current trunk and retested. OK for trunk?

        * include/std/mutex (__get_once_functor_lock, __get_once_mutex):
        Replace global lock object with local locks on global mutex.
        * src/mutex.cc: Likewise.
        * config/abi/pre/gnu.ver: Adjust.
        * testsuite/30_threads/call_once/call_once2.cc: New.

Jonathan
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