| /* |
| * Copyright (C) 2010 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 "sles_allinclusive.h" |
| |
| |
| /** \brief Exclusively lock an object */ |
| |
| #ifdef USE_DEBUG |
| void object_lock_exclusive_(IObject *thiz, const char *file, int line) |
| { |
| int ok; |
| ok = pthread_mutex_trylock(&thiz->mMutex); |
| if (0 != ok) { |
| // pthread_mutex_timedlock_np is not available, but wait up to 100 ms |
| static const useconds_t backoffs[] = {1, 10000, 20000, 30000, 40000}; |
| unsigned i = 0; |
| for (;;) { |
| usleep(backoffs[i]); |
| ok = pthread_mutex_trylock(&thiz->mMutex); |
| if (0 == ok) |
| break; |
| if (++i >= (sizeof(backoffs) / sizeof(backoffs[0]))) { |
| SL_LOGW("%s:%d: object %p was locked by %p at %s:%d\n", |
| file, line, thiz, *(void **)&thiz->mOwner, thiz->mFile, thiz->mLine); |
| // attempt one more time; maybe this time we will be successful |
| ok = pthread_mutex_lock(&thiz->mMutex); |
| assert(0 == ok); |
| break; |
| } |
| } |
| } |
| pthread_t zero; |
| memset(&zero, 0, sizeof(pthread_t)); |
| if (0 != memcmp(&zero, &thiz->mOwner, sizeof(pthread_t))) { |
| if (pthread_equal(pthread_self(), thiz->mOwner)) { |
| SL_LOGE("%s:%d: object %p was recursively locked by %p at %s:%d\n", |
| file, line, thiz, *(void **)&thiz->mOwner, thiz->mFile, thiz->mLine); |
| } else { |
| SL_LOGE("%s:%d: object %p was left unlocked in unexpected state by %p at %s:%d\n", |
| file, line, thiz, *(void **)&thiz->mOwner, thiz->mFile, thiz->mLine); |
| } |
| assert(false); |
| } |
| thiz->mOwner = pthread_self(); |
| thiz->mFile = file; |
| thiz->mLine = line; |
| } |
| #else |
| void object_lock_exclusive(IObject *thiz) |
| { |
| int ok; |
| ok = pthread_mutex_lock(&thiz->mMutex); |
| assert(0 == ok); |
| } |
| #endif |
| |
| |
| /** \brief Exclusively unlock an object and do not report any updates */ |
| |
| #ifdef USE_DEBUG |
| void object_unlock_exclusive_(IObject *thiz, const char *file, int line) |
| { |
| assert(pthread_equal(pthread_self(), thiz->mOwner)); |
| assert(NULL != thiz->mFile); |
| assert(0 != thiz->mLine); |
| memset(&thiz->mOwner, 0, sizeof(pthread_t)); |
| thiz->mFile = file; |
| thiz->mLine = line; |
| int ok; |
| ok = pthread_mutex_unlock(&thiz->mMutex); |
| assert(0 == ok); |
| } |
| #else |
| void object_unlock_exclusive(IObject *thiz) |
| { |
| int ok; |
| ok = pthread_mutex_unlock(&thiz->mMutex); |
| assert(0 == ok); |
| } |
| #endif |
| |
| |
| /** \brief Exclusively unlock an object and report updates to the specified bit-mask of |
| * attributes |
| */ |
| |
| #ifdef USE_DEBUG |
| void object_unlock_exclusive_attributes_(IObject *thiz, unsigned attributes, |
| const char *file, int line) |
| #else |
| void object_unlock_exclusive_attributes(IObject *thiz, unsigned attributes) |
| #endif |
| { |
| |
| #ifdef USE_DEBUG |
| assert(pthread_equal(pthread_self(), thiz->mOwner)); |
| assert(NULL != thiz->mFile); |
| assert(0 != thiz->mLine); |
| #endif |
| |
| int ok; |
| |
| // make SL object IDs be contiguous with XA object IDs |
| SLuint32 objectID = IObjectToObjectID(thiz); |
| SLuint32 index = objectID; |
| if ((XA_OBJECTID_ENGINE <= index) && (index <= XA_OBJECTID_CAMERADEVICE)) { |
| ; |
| } else if ((SL_OBJECTID_ENGINE <= index) && (index <= SL_OBJECTID_METADATAEXTRACTOR)) { |
| index -= SL_OBJECTID_ENGINE - XA_OBJECTID_CAMERADEVICE - 1; |
| } else { |
| assert(false); |
| index = 0; |
| } |
| |
| // first synchronously handle updates to attributes here, while object is still locked. |
| // This appears to be a loop, but actually typically runs through the loop only once. |
| unsigned asynchronous = attributes; |
| while (attributes) { |
| // this sequence is carefully crafted to be O(1); tread carefully when making changes |
| unsigned bit = ctz(attributes); |
| // ATTR_INDEX_MAX == next bit position after the last attribute |
| assert(ATTR_INDEX_MAX > bit); |
| // compute the entry in the handler table using object ID and bit number |
| AttributeHandler handler = handlerTable[index][bit]; |
| if (NULL != handler) { |
| asynchronous &= ~(*handler)(thiz); |
| } |
| attributes &= ~(1 << bit); |
| } |
| |
| // any remaining attributes are handled asynchronously in the sync thread |
| if (asynchronous) { |
| unsigned oldAttributesMask = thiz->mAttributesMask; |
| thiz->mAttributesMask = oldAttributesMask | asynchronous; |
| if (oldAttributesMask) { |
| asynchronous = ATTR_NONE; |
| } |
| } |
| |
| #ifdef ANDROID |
| // hack to safely handle a post-unlock AudioTrack::start() |
| android::sp<android::AudioTrackProxy> audioTrack; |
| if (SL_OBJECTID_AUDIOPLAYER == objectID) { |
| CAudioPlayer *ap = (CAudioPlayer *) thiz; |
| if (ap->mDeferredStart) { |
| audioTrack = ap->mAudioTrack; |
| ap->mDeferredStart = false; |
| } |
| } |
| #endif |
| |
| #ifdef USE_DEBUG |
| memset(&thiz->mOwner, 0, sizeof(pthread_t)); |
| thiz->mFile = file; |
| thiz->mLine = line; |
| #endif |
| ok = pthread_mutex_unlock(&thiz->mMutex); |
| assert(0 == ok); |
| |
| #ifdef ANDROID |
| // call AudioTrack::start() while not holding the mutex on AudioPlayer |
| if (audioTrack != 0) { |
| audioTrack->start(); |
| audioTrack.clear(); |
| } |
| #endif |
| |
| // first update to this interface since previous sync |
| if (ATTR_NONE != asynchronous) { |
| unsigned id = thiz->mInstanceID; |
| if (0 != id) { |
| --id; |
| assert(MAX_INSTANCE > id); |
| IEngine *thisEngine = &thiz->mEngine->mEngine; |
| // FIXME atomic or here |
| interface_lock_exclusive(thisEngine); |
| thisEngine->mChangedMask |= 1 << id; |
| interface_unlock_exclusive(thisEngine); |
| } |
| } |
| |
| } |
| |
| |
| /** \brief Wait on the condition variable associated with the object; see pthread_cond_wait */ |
| |
| #ifdef USE_DEBUG |
| void object_cond_wait_(IObject *thiz, const char *file, int line) |
| { |
| // note that this will unlock the mutex, so we have to clear the owner |
| assert(pthread_equal(pthread_self(), thiz->mOwner)); |
| assert(NULL != thiz->mFile); |
| assert(0 != thiz->mLine); |
| memset(&thiz->mOwner, 0, sizeof(pthread_t)); |
| thiz->mFile = file; |
| thiz->mLine = line; |
| // alas we don't know the new owner's identity |
| int ok; |
| ok = pthread_cond_wait(&thiz->mCond, &thiz->mMutex); |
| assert(0 == ok); |
| // restore my ownership |
| thiz->mOwner = pthread_self(); |
| thiz->mFile = file; |
| thiz->mLine = line; |
| } |
| #else |
| void object_cond_wait(IObject *thiz) |
| { |
| int ok; |
| ok = pthread_cond_wait(&thiz->mCond, &thiz->mMutex); |
| assert(0 == ok); |
| } |
| #endif |
| |
| |
| /** \brief Signal the condition variable associated with the object; see pthread_cond_signal */ |
| |
| void object_cond_signal(IObject *thiz) |
| { |
| int ok; |
| ok = pthread_cond_signal(&thiz->mCond); |
| assert(0 == ok); |
| } |
| |
| |
| /** \brief Broadcast the condition variable associated with the object; |
| * see pthread_cond_broadcast |
| */ |
| |
| void object_cond_broadcast(IObject *thiz) |
| { |
| int ok; |
| ok = pthread_cond_broadcast(&thiz->mCond); |
| assert(0 == ok); |
| } |