From d87a288e82120208af566677ef4c30fe1382df39 Mon Sep 17 00:00:00 2001
From: Kevin Rocard <krocard@google.com>
Date: Wed, 29 Aug 2018 16:22:52 -0700
Subject: [PATCH] Audio VTS: Workaround async HIDL destructor by sleeping

The test creates an instance of the Audio HAL then destroys it and create it again.
The test assumed that the destruction was synchronous when in fact it is async with
no way of knowing when the object has been destroyed.

As a result, until a better solution is found, sleep for 100ms to hopefully let enouth
time for the HAL destructor to return.

Bug: 112566489
Test: adb shell /data/nativetest64/VtsHalAudioV4_0TargetTest/VtsHalAudioV4_0TargetTest --gtest_filter=*OpenPrimaryDeviceUsingGetDevice
      atest VtsHalAudioV4_0TargetTest
Change-Id: I0ec75c12007d39060232632708722df5bf0f99d7
Signed-off-by: Kevin Rocard <krocard@google.com>
---
 .../functional/AudioPrimaryHidlHalTest.cpp    | 31 +++++++++++++------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
index 59ced271e0..359b4b3287 100644
--- a/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/4.0/vts/functional/AudioPrimaryHidlHalTest.cpp
@@ -29,6 +29,8 @@
 #include <fcntl.h>
 #include <unistd.h>
 
+#include <hwbinder/IPCThreadState.h>
+
 #include <VtsHalHidlTargetTestBase.h>
 
 #include <android-base/logging.h>
@@ -55,13 +57,14 @@ using std::vector;
 using std::list;
 
 using ::android::sp;
-using ::android::hardware::Return;
 using ::android::hardware::hidl_bitfield;
 using ::android::hardware::hidl_enum_iterator;
 using ::android::hardware::hidl_handle;
 using ::android::hardware::hidl_string;
 using ::android::hardware::hidl_vec;
+using ::android::hardware::IPCThreadState;
 using ::android::hardware::MQDescriptorSync;
+using ::android::hardware::Return;
 using ::android::hardware::audio::V4_0::AudioDrain;
 using ::android::hardware::audio::V4_0::DeviceAddress;
 using ::android::hardware::audio::V4_0::IDevice;
@@ -164,15 +167,25 @@ TEST_F(AudioHidlTest, OpenDeviceInvalidParameter) {
 
 TEST_F(AudioHidlTest, OpenPrimaryDeviceUsingGetDevice) {
     doc::test("Calling openDevice(\"primary\") should return the primary device.");
-    Result result;
-    sp<IDevice> baseDevice;
-    ASSERT_OK(devicesFactory->openDevice("primary", returnIn(result, baseDevice)));
-    ASSERT_OK(result);
-    ASSERT_TRUE(baseDevice != nullptr);
+    {
+        Result result;
+        sp<IDevice> baseDevice;
+        ASSERT_OK(devicesFactory->openDevice("primary", returnIn(result, baseDevice)));
+        ASSERT_OK(result);
+        ASSERT_TRUE(baseDevice != nullptr);
 
-    Return<sp<IPrimaryDevice>> primaryDevice = IPrimaryDevice::castFrom(baseDevice);
-    ASSERT_TRUE(primaryDevice.isOk());
-    ASSERT_TRUE(sp<IPrimaryDevice>(primaryDevice) != nullptr);
+        Return<sp<IPrimaryDevice>> primaryDevice = IPrimaryDevice::castFrom(baseDevice);
+        ASSERT_TRUE(primaryDevice.isOk());
+        ASSERT_TRUE(sp<IPrimaryDevice>(primaryDevice) != nullptr);
+    }  // Destroy local IDevice proxy
+    // FIXME: there is no way to know when the remote IDevice is being destroyed
+    //        Binder does not support testing if an object is alive, thus
+    //        wait for 100ms to let the binder destruction propagates and
+    //        the remote device has the time to be destroyed.
+    //        flushCommand makes sure all local command are sent, thus should reduce
+    //        the latency between local and remote destruction.
+    IPCThreadState::self()->flushCommands();
+    usleep(100);
 }
 
 //////////////////////////////////////////////////////////////////////////////