Use a shared ref for Vibrator when passed to a worker thread.
To try to protect against this easy mistake, I removed the implicit
capture from thread lambdas.
Bug: 228523213
Test: atest
Change-Id: I8fa37dacb4acf89848a8b17db8db317a988809d4
diff --git a/vibrator/aidl/default/Vibrator.cpp b/vibrator/aidl/default/Vibrator.cpp
index ddc6ee0..01602ab 100644
--- a/vibrator/aidl/default/Vibrator.cpp
+++ b/vibrator/aidl/default/Vibrator.cpp
@@ -59,7 +59,10 @@
const std::shared_ptr<IVibratorCallback>& callback) {
LOG(VERBOSE) << "Vibrator on for timeoutMs: " << timeoutMs;
if (callback != nullptr) {
- std::thread([=] {
+ // Note that thread lambdas aren't using implicit capture [=], to avoid capturing "this",
+ // which may be asynchronously destructed.
+ // If "this" is needed, use [sharedThis = this->ref<Vibrator>()].
+ std::thread([timeoutMs, callback] {
LOG(VERBOSE) << "Starting on on another thread";
usleep(timeoutMs * 1000);
LOG(VERBOSE) << "Notifying on complete";
@@ -87,7 +90,7 @@
constexpr size_t kEffectMillis = 100;
if (callback != nullptr) {
- std::thread([=] {
+ std::thread([callback] {
LOG(VERBOSE) << "Starting perform on another thread";
usleep(kEffectMillis * 1000);
LOG(VERBOSE) << "Notifying perform complete";
@@ -174,7 +177,8 @@
}
}
- std::thread([=] {
+ // The thread may theoretically outlive the vibrator, so take a proper reference to it.
+ std::thread([sharedThis = this->ref<Vibrator>(), composite, callback] {
LOG(VERBOSE) << "Starting compose on another thread";
for (auto& e : composite) {
@@ -185,7 +189,7 @@
<< e.scale;
int32_t durationMs;
- getPrimitiveDuration(e.primitive, &durationMs);
+ sharedThis->getPrimitiveDuration(e.primitive, &durationMs);
usleep(durationMs * 1000);
}
@@ -396,7 +400,7 @@
}
}
- std::thread([=] {
+ std::thread([totalDuration, callback] {
LOG(VERBOSE) << "Starting composePwle on another thread";
usleep(totalDuration * 1000);
if (callback != nullptr) {
diff --git a/vibrator/aidl/default/VibratorManager.cpp b/vibrator/aidl/default/VibratorManager.cpp
index 7cf9e6a..26edf5a 100644
--- a/vibrator/aidl/default/VibratorManager.cpp
+++ b/vibrator/aidl/default/VibratorManager.cpp
@@ -66,7 +66,7 @@
ndk::ScopedAStatus VibratorManager::triggerSynced(
const std::shared_ptr<IVibratorCallback>& callback) {
LOG(INFO) << "Vibrator Manager trigger synced";
- std::thread([=] {
+ std::thread([callback] {
if (callback != nullptr) {
LOG(INFO) << "Notifying perform complete";
callback->onComplete();