diff options
author | Hans Boehm <hboehm@google.com> | 2014-07-23 11:35:13 -0700 |
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committer | Hans Boehm <hboehm@google.com> | 2014-07-23 11:35:13 -0700 |
commit | 636e577167b621b844e840e6f3aa525977383c7c (patch) | |
tree | bf154f48f3a09374c7ac6c1accde293f2e4fdf0e /Binder.cpp | |
parent | 6ef1f816af52b83f32709a92316ad54f7a816b09 (diff) | |
download | libhwbinder-636e577167b621b844e840e6f3aa525977383c7c.tar.gz |
Remove incorrect android_atomic_...64 use.
Change the mExtras field in Binder.h to be a stdatomic.h atomic
value, and replace references to it with proper stdatomic.h calls.
This removes one of a small number of remaining 64 bit
android_atomic references. It also replaces the erroneously
non-atomic read accesses to mExtras.
It would be better if this used the C++11 <atomic> facility,
but we don't quite have that yet.
Bug: 16513433
Change-Id: Ibabb88d05025187ee1ce6c7f1aa670b133a547f8
Diffstat (limited to 'Binder.cpp')
-rw-r--r-- | Binder.cpp | 32 |
1 files changed, 18 insertions, 14 deletions
@@ -16,7 +16,7 @@ #include <binder/Binder.h> -#include <utils/Atomic.h> +#include <stdatomic.h> #include <utils/misc.h> #include <binder/BpBinder.h> #include <binder/IInterface.h> @@ -71,8 +71,8 @@ public: // --------------------------------------------------------------------------- BBinder::BBinder() - : mExtras(NULL) { + atomic_init(&mExtras, 0); } bool BBinder::isBinderAlive() const @@ -139,19 +139,19 @@ void BBinder::attachObject( const void* objectID, void* object, void* cleanupCookie, object_cleanup_func func) { - Extras* e = mExtras; + Extras* e = reinterpret_cast<Extras*>( + atomic_load_explicit(&mExtras, memory_order_acquire)); if (!e) { e = new Extras; -#ifdef __LP64__ - if (android_atomic_release_cas64(0, reinterpret_cast<int64_t>(e), - reinterpret_cast<volatile int64_t*>(&mExtras)) != 0) { -#else - if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e), - reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) { -#endif + uintptr_t* expected = 0; + if (!atomic_compare_exchange_strong_explicit( + &mExtras, &expected, + reinterpret_cast<uintptr_t>(e), + memory_order_release, + memory_order_acquire)) { delete e; - e = mExtras; + e = reinterpret_cast<Extras*>(expected); // Filled in by CAS } if (e == 0) return; // out of memory } @@ -162,7 +162,8 @@ void BBinder::attachObject( void* BBinder::findObject(const void* objectID) const { - Extras* e = mExtras; + Extras* e = reinterpret_cast<Extras*>( + atomic_load_explicit(&mExtras, memory_order_acquire)); if (!e) return NULL; AutoMutex _l(e->mLock); @@ -171,7 +172,8 @@ void* BBinder::findObject(const void* objectID) const void BBinder::detachObject(const void* objectID) { - Extras* e = mExtras; + Extras* e = reinterpret_cast<Extras*>( + atomic_load_explicit(&mExtras, memory_order_acquire)); if (!e) return; AutoMutex _l(e->mLock); @@ -185,7 +187,9 @@ BBinder* BBinder::localBinder() BBinder::~BBinder() { - if (mExtras) delete mExtras; + Extras* e = reinterpret_cast<Extras*>( + atomic_load_explicit(&mExtras, memory_order_relaxed)); + if (e) delete e; } |