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am 4a7001ca: Merge "Work around C11 const atomic restrictions."

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* commit '4a7001cae482e3c9410001360374c8fe9d5a2846':
  Work around C11 const atomic restrictions.
This commit is contained in:
Hans Boehm 2014-09-12 15:54:52 +00:00 committed by Android Git Automerger
commit e03abcd61b
1 changed files with 9 additions and 1 deletions
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10
libs/binder/Binder.cpp
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@ -160,10 +160,18 @@ void BBinder::attachObject(
e->mObjects.attach(objectID, object, cleanupCookie, func);
}
// The C11 standard doesn't allow atomic loads from const fields,
// though C++11 does. Fudge it until standards get straightened out.
static inline uintptr_t load_const_atomic(const atomic_uintptr_t* p,
memory_order mo) {
atomic_uintptr_t* non_const_p = const_cast<atomic_uintptr_t*>(p);
return atomic_load_explicit(non_const_p, mo);
}
void* BBinder::findObject(const void* objectID) const
{
Extras* e = reinterpret_cast<Extras*>(
atomic_load_explicit(&mExtras, memory_order_acquire));
load_const_atomic(&mExtras, memory_order_acquire));
if (!e) return NULL;
AutoMutex _l(e->mLock);