blob: d1165985fea49fca8c583e173920e6b6ae0e9ffb [file] [log] [blame]
* Copyright (C) 2016 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <android/hidl/base/1.0/IBase.h>
#include <hidl/HidlBinderSupport.h>
#include <hidl/HidlSupport.h>
#include <hidl/HidlTransportUtils.h>
namespace android {
namespace hardware {
/* Configures the threadpool used for handling incoming RPC calls in this process.
* This method MUST be called before interacting with any HIDL interfaces,
* including the IFoo::getService and IFoo::registerAsService methods.
* @param maxThreads maximum number of threads in this process
* @param callerWillJoin whether the caller will join the threadpool later.
* Note that maxThreads must include the caller thread if callerWillJoin is true;
* If you want to create a threadpool of 5 threads, without the caller ever joining:
* configureRpcThreadPool(5, false);
* If you want to create a threadpool of 1 thread, with the caller joining:
* configureRpcThreadPool(1, true); // transport won't launch any threads by itself
void configureRpcThreadpool(size_t maxThreads, bool callerWillJoin);
/* Joins a threadpool that you configured earlier with
* configureRpcThreadPool(x, true);
void joinRpcThreadpool();
* Sets a minimum scheduler policy for all transactions coming into this
* service.
* This method MUST be called before passing this service to another process
* and/or registering it with registerAsService().
* @param service the service to set the policy for
* @param policy scheduler policy as defined in linux UAPI
* @param priority priority. [-20..19] for SCHED_NORMAL, [1..99] for RT
bool setMinSchedulerPolicy(const sp<::android::hidl::base::V1_0::IBase>& service,
int policy, int priority);
template <typename ILeft, typename IRight>
bool interfacesEqual(sp<ILeft> left, sp<IRight> right) {
if (left == nullptr || right == nullptr || !left->isRemote() || !right->isRemote()) {
return left == right;
return toBinder<ILeft>(left) == toBinder<IRight>(right);
namespace details {
// cast the interface IParent to IChild.
// Return nonnull if cast successful.
// Return nullptr if:
// 1. parent is null
// 2. cast failed because IChild is not a child type of IParent.
// 3. !emitError, calling into parent fails.
// Return an error Return object if:
// 1. emitError, calling into parent fails.
template <typename IChild, typename IParent, typename BpChild>
Return<sp<IChild>> castInterface(sp<IParent> parent, const char* childIndicator, bool emitError) {
if (parent.get() == nullptr) {
// casts always succeed with nullptrs.
return nullptr;
Return<bool> canCastRet = details::canCastInterface(parent.get(), childIndicator, emitError);
if (!canCastRet.isOk()) {
// call fails, propagate the error if emitError
return emitError
? details::StatusOf<bool, sp<IChild>>(canCastRet)
: Return<sp<IChild>>(sp<IChild>(nullptr));
if (!canCastRet) {
return sp<IChild>(nullptr); // cast failed.
// TODO b/32001926 Needs to be fixed for socket mode.
if (parent->isRemote()) {
// binderized mode. Got BpChild. grab the remote and wrap it.
return sp<IChild>(new BpChild(toBinder<IParent>(parent)));
// Passthrough mode. Got BnChild and BsChild.
return sp<IChild>(static_cast<IChild *>(parent.get()));
} // namespace details
} // namespace hardware
} // namespace android