07fb20a384
The use of membar_enter is to separate atomic r/m/w on a lock from the body of the critical section so two different critical sections happen in order: body of previous critical section; exit critical section: membar_exit(); atomic_r/m/w(lock stuff); enter critical section: atomic_r/m/w(lock stuff); membar_enter(); body of next critical section; _rtld_shared_enter does this, but it _also_ issued an extraneous membar_enter before the atomic_r/m/w part, which doesn't impose any semantically important order but may cost some performance. |
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| Makefile | ||
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