aaudio: defer closing of stream until safe
When a client asks to close the stream, we mark it as
closeable. When the last client finishes with the stream
then we actually close it. References to the stream are counted.
This will prevent a stream from getting closed while another thread is
trying to start it or stop it, etc.
Test: CTS nativemedia/aaudio
Change-Id: Ic1c7eceded6bff9899f37a5e7d9f2b695b8cdc97
diff --git a/services/oboeservice/AAudioService.cpp b/services/oboeservice/AAudioService.cpp
index 51ae665..ac3202b 100644
--- a/services/oboeservice/AAudioService.cpp
+++ b/services/oboeservice/AAudioService.cpp
@@ -142,7 +142,31 @@
}
}
+// If a close request is pending then close the stream
+bool AAudioService::releaseStream(const sp<AAudioServiceStreamBase> &serviceStream) {
+ bool closed = false;
+ if ((serviceStream->decrementServiceReferenceCount() == 0) && serviceStream->isCloseNeeded()) {
+ // removeStreamByHandle() uses a lock so that if there are two simultaneous closes
+ // then only one will get the pointer and do the close.
+ sp<AAudioServiceStreamBase> foundStream = mStreamTracker.removeStreamByHandle(serviceStream->getHandle());
+ if (foundStream.get() != nullptr) {
+ foundStream->close();
+ pid_t pid = foundStream->getOwnerProcessId();
+ AAudioClientTracker::getInstance().unregisterClientStream(pid, foundStream);
+ }
+ closed = true;
+ }
+ return closed;
+}
+
+aaudio_result_t AAudioService::checkForPendingClose(
+ const sp<AAudioServiceStreamBase> &serviceStream,
+ aaudio_result_t defaultResult) {
+ return releaseStream(serviceStream) ? AAUDIO_ERROR_INVALID_STATE : defaultResult;
+}
+
aaudio_result_t AAudioService::closeStream(aaudio_handle_t streamHandle) {
+ ALOGD("closeStream(0x%08X)", streamHandle);
// Check permission and ownership first.
sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
if (serviceStream.get() == nullptr) {
@@ -150,22 +174,13 @@
return AAUDIO_ERROR_INVALID_HANDLE;
}
- ALOGD("closeStream(0x%08X)", streamHandle);
- // Remove handle from tracker so that we cannot look up the raw address any more.
- // removeStreamByHandle() uses a lock so that if there are two simultaneous closes
- // then only one will get the pointer and do the close.
- serviceStream = mStreamTracker.removeStreamByHandle(streamHandle);
- if (serviceStream.get() != nullptr) {
- serviceStream->close();
- pid_t pid = serviceStream->getOwnerProcessId();
- AAudioClientTracker::getInstance().unregisterClientStream(pid, serviceStream);
- return AAUDIO_OK;
- } else {
- ALOGW("closeStream(0x%0x) being handled by another thread", streamHandle);
- return AAUDIO_ERROR_INVALID_HANDLE;
- }
-}
+ pid_t pid = serviceStream->getOwnerProcessId();
+ AAudioClientTracker::getInstance().unregisterClientStream(pid, serviceStream);
+ serviceStream->setCloseNeeded(true);
+ (void) releaseStream(serviceStream);
+ return AAUDIO_OK;
+}
sp<AAudioServiceStreamBase> AAudioService::convertHandleToServiceStream(
aaudio_handle_t streamHandle) {
@@ -181,7 +196,9 @@
if (!allowed) {
ALOGE("AAudioService: calling uid %d cannot access stream 0x%08X owned by %d",
callingUserId, streamHandle, ownerUserId);
- serviceStream = nullptr;
+ serviceStream.clear();
+ } else {
+ serviceStream->incrementServiceReferenceCount();
}
}
return serviceStream;
@@ -198,7 +215,7 @@
aaudio_result_t result = serviceStream->getDescription(parcelable);
// parcelable.dump();
- return result;
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::startStream(aaudio_handle_t streamHandle) {
@@ -208,7 +225,8 @@
return AAUDIO_ERROR_INVALID_HANDLE;
}
- return serviceStream->start();
+ aaudio_result_t result = serviceStream->start();
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::pauseStream(aaudio_handle_t streamHandle) {
@@ -218,7 +236,7 @@
return AAUDIO_ERROR_INVALID_HANDLE;
}
aaudio_result_t result = serviceStream->pause();
- return result;
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::stopStream(aaudio_handle_t streamHandle) {
@@ -228,7 +246,7 @@
return AAUDIO_ERROR_INVALID_HANDLE;
}
aaudio_result_t result = serviceStream->stop();
- return result;
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::flushStream(aaudio_handle_t streamHandle) {
@@ -237,48 +255,51 @@
ALOGE("flushStream(), illegal stream handle = 0x%0x", streamHandle);
return AAUDIO_ERROR_INVALID_HANDLE;
}
- return serviceStream->flush();
+ aaudio_result_t result = serviceStream->flush();
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::registerAudioThread(aaudio_handle_t streamHandle,
pid_t clientThreadId,
int64_t periodNanoseconds) {
+ aaudio_result_t result = AAUDIO_OK;
sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
if (serviceStream.get() == nullptr) {
ALOGE("registerAudioThread(), illegal stream handle = 0x%0x", streamHandle);
return AAUDIO_ERROR_INVALID_HANDLE;
}
if (serviceStream->getRegisteredThread() != AAudioServiceStreamBase::ILLEGAL_THREAD_ID) {
- ALOGE("registerAudioThread(), thread already registered");
- return AAUDIO_ERROR_INVALID_STATE;
- }
-
- const pid_t ownerPid = IPCThreadState::self()->getCallingPid(); // TODO review
- serviceStream->setRegisteredThread(clientThreadId);
- int err = android::requestPriority(ownerPid, clientThreadId,
- DEFAULT_AUDIO_PRIORITY, true /* isForApp */);
- if (err != 0){
- ALOGE("registerAudioThread(%d) failed, errno = %d, priority = %d",
- clientThreadId, errno, DEFAULT_AUDIO_PRIORITY);
- return AAUDIO_ERROR_INTERNAL;
+ ALOGE("AAudioService::registerAudioThread(), thread already registered");
+ result = AAUDIO_ERROR_INVALID_STATE;
} else {
- return AAUDIO_OK;
+ const pid_t ownerPid = IPCThreadState::self()->getCallingPid(); // TODO review
+ serviceStream->setRegisteredThread(clientThreadId);
+ int err = android::requestPriority(ownerPid, clientThreadId,
+ DEFAULT_AUDIO_PRIORITY, true /* isForApp */);
+ if (err != 0) {
+ ALOGE("AAudioService::registerAudioThread(%d) failed, errno = %d, priority = %d",
+ clientThreadId, errno, DEFAULT_AUDIO_PRIORITY);
+ result = AAUDIO_ERROR_INTERNAL;
+ }
}
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::unregisterAudioThread(aaudio_handle_t streamHandle,
pid_t clientThreadId) {
+ aaudio_result_t result = AAUDIO_OK;
sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
if (serviceStream.get() == nullptr) {
ALOGE("unregisterAudioThread(), illegal stream handle = 0x%0x", streamHandle);
return AAUDIO_ERROR_INVALID_HANDLE;
}
if (serviceStream->getRegisteredThread() != clientThreadId) {
- ALOGE("unregisterAudioThread(), wrong thread");
- return AAUDIO_ERROR_ILLEGAL_ARGUMENT;
+ ALOGE("AAudioService::unregisterAudioThread(), wrong thread");
+ result = AAUDIO_ERROR_ILLEGAL_ARGUMENT;
+ } else {
+ serviceStream->setRegisteredThread(0);
}
- serviceStream->setRegisteredThread(0);
- return AAUDIO_OK;
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::startClient(aaudio_handle_t streamHandle,
@@ -289,7 +310,8 @@
ALOGE("startClient(), illegal stream handle = 0x%0x", streamHandle);
return AAUDIO_ERROR_INVALID_HANDLE;
}
- return serviceStream->startClient(client, clientHandle);
+ aaudio_result_t result = serviceStream->startClient(client, clientHandle);
+ return checkForPendingClose(serviceStream, result);
}
aaudio_result_t AAudioService::stopClient(aaudio_handle_t streamHandle,
@@ -299,5 +321,6 @@
ALOGE("stopClient(), illegal stream handle = 0x%0x", streamHandle);
return AAUDIO_ERROR_INVALID_HANDLE;
}
- return serviceStream->stopClient(clientHandle);
+ aaudio_result_t result = serviceStream->stopClient(clientHandle);
+ return checkForPendingClose(serviceStream, result);
}
diff --git a/services/oboeservice/AAudioService.h b/services/oboeservice/AAudioService.h
index eef0824..bdd9e0b 100644
--- a/services/oboeservice/AAudioService.h
+++ b/services/oboeservice/AAudioService.h
@@ -94,9 +94,15 @@
aaudio::aaudio_handle_t streamHandle);
- android::AudioClient mAudioClient;
- aaudio::AAudioStreamTracker mStreamTracker;
+ bool releaseStream(const sp<aaudio::AAudioServiceStreamBase> &serviceStream);
+
+ aaudio_result_t checkForPendingClose(const sp<aaudio::AAudioServiceStreamBase> &serviceStream,
+ aaudio_result_t defaultResult);
+
+ android::AudioClient mAudioClient;
+
+ aaudio::AAudioStreamTracker mStreamTracker;
enum constants {
DEFAULT_AUDIO_PRIORITY = 2
diff --git a/services/oboeservice/AAudioServiceStreamBase.cpp b/services/oboeservice/AAudioServiceStreamBase.cpp
index 635b45c..53d2860 100644
--- a/services/oboeservice/AAudioServiceStreamBase.cpp
+++ b/services/oboeservice/AAudioServiceStreamBase.cpp
@@ -402,3 +402,13 @@
void AAudioServiceStreamBase::onVolumeChanged(float volume) {
sendServiceEvent(AAUDIO_SERVICE_EVENT_VOLUME, volume);
}
+
+int32_t AAudioServiceStreamBase::incrementServiceReferenceCount() {
+ std::lock_guard<std::mutex> lock(mCallingCountLock);
+ return ++mCallingCount;
+}
+
+int32_t AAudioServiceStreamBase::decrementServiceReferenceCount() {
+ std::lock_guard<std::mutex> lock(mCallingCountLock);
+ return --mCallingCount;
+}
diff --git a/services/oboeservice/AAudioServiceStreamBase.h b/services/oboeservice/AAudioServiceStreamBase.h
index 29987f6..5f5bb98 100644
--- a/services/oboeservice/AAudioServiceStreamBase.h
+++ b/services/oboeservice/AAudioServiceStreamBase.h
@@ -199,6 +199,26 @@
return mFlowing;
}
+ /**
+ * Atomically increment the number of active references to the stream by AAudioService.
+ * @return value after the increment
+ */
+ int32_t incrementServiceReferenceCount();
+
+ /**
+ * Atomically decrement the number of active references to the stream by AAudioService.
+ * @return value after the decrement
+ */
+ int32_t decrementServiceReferenceCount();
+
+ bool isCloseNeeded() const {
+ return mCloseNeeded.load();
+ }
+
+ void setCloseNeeded(bool needed) {
+ mCloseNeeded.store(needed);
+ }
+
protected:
/**
@@ -256,8 +276,11 @@
private:
aaudio_handle_t mHandle = -1;
-
bool mFlowing = false;
+
+ std::mutex mCallingCountLock;
+ std::atomic<int32_t> mCallingCount{0};
+ std::atomic<bool> mCloseNeeded{false};
};
} /* namespace aaudio */