/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "CallbackProtector.h"
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#include "sllog.h"
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#include <media/stagefright/foundation/ADebug.h>
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//--------------------------------------------------------------------------------------------------
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namespace android {
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CallbackProtector::CallbackProtector() : RefBase(),
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mSafeToEnterCb(true),
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mCbCount(0)
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#ifdef USE_DEBUG
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, mCallbackThread((pthread_t) NULL),
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mCallbackTid(0),
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mRequesterThread((pthread_t) NULL),
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mRequesterTid(0)
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#endif
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{
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}
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CallbackProtector::~CallbackProtector() {
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Mutex::Autolock _l(mLock);
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if (mCbCount) {
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SL_LOGE("Callback protector detected an active callback after destroy");
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}
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}
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// static
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bool CallbackProtector::enterCbIfOk(const sp<CallbackProtector> &protector) {
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if (protector != 0) {
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return protector->enterCb();
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} else {
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SL_LOGE("Callback protector is missing");
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return false;
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}
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}
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bool CallbackProtector::enterCb() {
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Mutex::Autolock _l(mLock);
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if (mSafeToEnterCb) {
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mCbCount++;
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#ifdef USE_DEBUG
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if (mCbCount > 1) {
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SL_LOGV("Callback protector allowed multiple or nested callback entry: %u", mCbCount);
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} else {
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mCallbackThread = pthread_self();
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mCallbackTid = gettid();
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}
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#endif
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} else {
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#ifdef USE_DEBUG
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SL_LOGV("Callback protector denied callback entry by thread %p tid %d during destroy"
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" requested by thread %p tid %d",
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(void *) pthread_self(), gettid(),
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(void *) mRequesterThread, mRequesterTid);
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#else
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SL_LOGV("Callback protector denied callback entry during destroy");
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#endif
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}
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return mSafeToEnterCb;
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}
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void CallbackProtector::exitCb() {
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Mutex::Autolock _l(mLock);
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CHECK(mCbCount > 0);
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mCbCount--;
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if (mCbCount == 0) {
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if (!mSafeToEnterCb) {
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#ifdef USE_DEBUG
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SL_LOGV("Callback protector detected return from callback by thread %p tid %d during"
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" destroy requested by thread %p tid %d",
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(void *) mCallbackThread, mCallbackTid,
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(void *) mRequesterThread, mRequesterTid);
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#else
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SL_LOGV("Callback protector detected return from callback during destroy");
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#endif
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mCbExitedCondition.broadcast();
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}
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#ifdef USE_DEBUG
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mCallbackThread = (pthread_t) NULL;
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mCallbackTid = 0;
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#endif
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}
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}
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void CallbackProtector::requestCbExitAndWait() {
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Mutex::Autolock _l(mLock);
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mSafeToEnterCb = false;
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#ifdef USE_DEBUG
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mRequesterThread = pthread_self();
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mRequesterTid = gettid();
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#endif
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while (mCbCount) {
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#ifdef USE_DEBUG
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SL_LOGV("Callback protector detected in-progress callback by thread %p tid %d during"
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" blocking destroy requested by thread %p tid %d",
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(void *) mCallbackThread, mCallbackTid,
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(void *) pthread_self(), gettid());
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#else
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SL_LOGV("Callback protector detected in-progress callback during blocking destroy");
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#endif
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mCbExitedCondition.wait(mLock);
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}
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}
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void CallbackProtector::requestCbExit() {
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Mutex::Autolock _l(mLock);
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mSafeToEnterCb = false;
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#ifdef USE_DEBUG
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mRequesterThread = pthread_self();
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mRequesterTid = gettid();
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#endif
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if (mCbCount) {
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#ifdef USE_DEBUG
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SL_LOGV("Callback protector detected in-progress callback by thread %p tid %d during"
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" non-blocking destroy requested by thread %p tid %d",
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(void *) mCallbackThread, mCallbackTid,
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(void *) pthread_self(), gettid());
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#else
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SL_LOGV("Callback protector detected in-progress callback during non-blocking destroy");
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#endif
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}
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}
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} // namespace android
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