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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hwbinder/Binder.h>
#include <atomic>
#include <utils/misc.h>
#include <hwbinder/BpHwBinder.h>
#include <hwbinder/IInterface.h>
#include <hwbinder/Parcel.h>
#include <sched.h>
#include <stdio.h>
namespace android {
namespace hardware {
// ---------------------------------------------------------------------------
IBinder::IBinder()
: RefBase()
{
}
IBinder::~IBinder()
{
}
// ---------------------------------------------------------------------------
BHwBinder* IBinder::localBinder()
{
return nullptr;
}
BpHwBinder* IBinder::remoteBinder()
{
return nullptr;
}
bool IBinder::checkSubclass(const void* /*subclassID*/) const
{
return false;
}
// ---------------------------------------------------------------------------
class BHwBinder::Extras
{
public:
Mutex mLock;
BpHwBinder::ObjectManager mObjects;
};
// ---------------------------------------------------------------------------
BHwBinder::BHwBinder() : mSchedPolicy(SCHED_NORMAL), mSchedPriority(0), mExtras(nullptr)
{
}
int BHwBinder::getMinSchedulingPolicy() {
return mSchedPolicy;
}
int BHwBinder::getMinSchedulingPriority() {
return mSchedPriority;
}
status_t BHwBinder::transact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags, TransactCallback callback)
{
data.setDataPosition(0);
status_t err = NO_ERROR;
switch (code) {
default:
err = onTransact(code, data, reply, flags,
[&](auto &replyParcel) {
replyParcel.setDataPosition(0);
if (callback != nullptr) {
callback(replyParcel);
}
});
break;
}
return err;
}
status_t BHwBinder::linkToDeath(
const sp<DeathRecipient>& /*recipient*/, void* /*cookie*/,
uint32_t /*flags*/)
{
return INVALID_OPERATION;
}
status_t BHwBinder::unlinkToDeath(
const wp<DeathRecipient>& /*recipient*/, void* /*cookie*/,
uint32_t /*flags*/, wp<DeathRecipient>* /*outRecipient*/)
{
return INVALID_OPERATION;
}
void BHwBinder::attachObject(
const void* objectID, void* object, void* cleanupCookie,
object_cleanup_func func)
{
Extras* e = mExtras.load(std::memory_order_acquire);
if (!e) {
e = new Extras;
Extras* expected = nullptr;
if (!mExtras.compare_exchange_strong(expected, e,
std::memory_order_release,
std::memory_order_acquire)) {
delete e;
e = expected; // Filled in by CAS
}
if (e == nullptr) return; // out of memory
}
AutoMutex _l(e->mLock);
e->mObjects.attach(objectID, object, cleanupCookie, func);
}
void* BHwBinder::findObject(const void* objectID) const
{
Extras* e = mExtras.load(std::memory_order_acquire);
if (!e) return nullptr;
AutoMutex _l(e->mLock);
return e->mObjects.find(objectID);
}
void BHwBinder::detachObject(const void* objectID)
{
Extras* e = mExtras.load(std::memory_order_acquire);
if (!e) return;
AutoMutex _l(e->mLock);
e->mObjects.detach(objectID);
}
BHwBinder* BHwBinder::localBinder()
{
return this;
}
BHwBinder::~BHwBinder()
{
Extras* e = mExtras.load(std::memory_order_relaxed);
if (e) delete e;
}
status_t BHwBinder::onTransact(
uint32_t /*code*/, const Parcel& /*data*/, Parcel* /*reply*/, uint32_t /*flags*/,
TransactCallback /*callback*/)
{
return UNKNOWN_TRANSACTION;
}
// ---------------------------------------------------------------------------
enum {
// This is used to transfer ownership of the remote binder from
// the BpHwRefBase object holding it (when it is constructed), to the
// owner of the BpHwRefBase object when it first acquires that BpHwRefBase.
kRemoteAcquired = 0x00000001
};
BpHwRefBase::BpHwRefBase(const sp<IBinder>& o)
: mRemote(o.get()), mRefs(nullptr), mState(0)
{
if (mRemote) {
mRemote->incStrong(this); // Removed on first IncStrong().
}
}
BpHwRefBase::~BpHwRefBase()
{
if (mRemote) {
if (!(mState.load(std::memory_order_relaxed)&kRemoteAcquired)) {
mRemote->decStrong(this);
}
}
}
void BpHwRefBase::onFirstRef()
{
mState.fetch_or(kRemoteAcquired, std::memory_order_relaxed);
}
void BpHwRefBase::onLastStrongRef(const void* /*id*/)
{
if (mRemote) {
mRemote->decStrong(this);
}
}
bool BpHwRefBase::onIncStrongAttempted(uint32_t /*flags*/, const void* /*id*/)
{
return false;
}
// ---------------------------------------------------------------------------
}; // namespace hardware
}; // namespace android
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