DO NOT MERGE - improve audio effect framwework thread safety
- Reorganize handle effect creation code to make sure the effect engine
is created with both thread and effect chain mutex held.
- Reorganize handle disconnect code to make sure the effect engine
is released with both thread and effect chain mutex held.
- Protect IEffect interface methods in EffectHande with a Mutex.
- Only pin effect if the session was acquired first.
- Do not use strong pointer to EffectModule in EffectHandles:
only the EffectChain has a single strong reference to the EffectModule.
- Check reply size before writing status in EffectHandle::command()
Bug: 32707507
Bug: 32095713
Change-Id: Ia1098cba2cd32cc2d1c9dfdff4adc2388dfed80e
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 0aef53f..bf82078 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1105,7 +1105,7 @@
ALOGV("%d died, releasing its sessions", pid);
size_t num = mAudioSessionRefs.size();
bool removed = false;
- for (size_t i = 0; i< num; ) {
+ for (size_t i = 0; i < num; ) {
AudioSessionRef *ref = mAudioSessionRefs.itemAt(i);
ALOGV(" pid %d @ %d", ref->mPid, i);
if (ref->mPid == pid) {
@@ -1885,7 +1885,7 @@
}
size_t num = mAudioSessionRefs.size();
- for (size_t i = 0; i< num; i++) {
+ for (size_t i = 0; i < num; i++) {
AudioSessionRef *ref = mAudioSessionRefs.editItemAt(i);
if (ref->mSessionid == audioSession && ref->mPid == caller) {
ref->mCnt++;
@@ -1903,7 +1903,7 @@
pid_t caller = IPCThreadState::self()->getCallingPid();
ALOGV("releasing %d from %d", audioSession, caller);
size_t num = mAudioSessionRefs.size();
- for (size_t i = 0; i< num; i++) {
+ for (size_t i = 0; i < num; i++) {
AudioSessionRef *ref = mAudioSessionRefs.itemAt(i);
if (ref->mSessionid == audioSession && ref->mPid == caller) {
ref->mCnt--;
@@ -1921,6 +1921,18 @@
ALOGW_IF(caller != getpid_cached, "session id %d not found for pid %d", audioSession, caller);
}
+bool AudioFlinger::isSessionAcquired_l(int audioSession)
+{
+ size_t num = mAudioSessionRefs.size();
+ for (size_t i = 0; i < num; i++) {
+ AudioSessionRef *ref = mAudioSessionRefs.itemAt(i);
+ if (ref->mSessionid == audioSession) {
+ return true;
+ }
+ }
+ return false;
+}
+
void AudioFlinger::purgeStaleEffects_l() {
ALOGV("purging stale effects");
@@ -2253,8 +2265,9 @@
sp<Client> client = registerPid_l(pid);
// create effect on selected output thread
+ bool pinned = (sessionId > AUDIO_SESSION_OUTPUT_MIX) && isSessionAcquired_l(sessionId);
handle = thread->createEffect_l(client, effectClient, priority, sessionId,
- &desc, enabled, &lStatus);
+ &desc, enabled, &lStatus, pinned);
if (handle != 0 && id != NULL) {
*id = handle->id();
}