aaudio: cleanup thread handling
Fix problem when an attempt is made to join the callback from the
callback. It used to leave mHasThread in the wrong state.
This was fixed in AAudioThread and in AudioStream.
Add "_l" suffix to functions that need to be locked.
Simplify the way that reference counted objects are passed to threads
using incStrong() and decStrong().
Bug: 171296283
Test: atest AAudioTestCases
Change-Id: I034049c4cb9021c6073fff441e49214ee898b804
diff --git a/services/oboeservice/AAudioThread.cpp b/services/oboeservice/AAudioThread.cpp
index ed7895b..68496ac 100644
--- a/services/oboeservice/AAudioThread.cpp
+++ b/services/oboeservice/AAudioThread.cpp
@@ -37,10 +37,13 @@
setup("AAudio");
}
-void AAudioThread::setup(const char *prefix) {
- // mThread is a pthread_t of unknown size so we need memset().
- memset(&mThread, 0, sizeof(mThread));
+AAudioThread::~AAudioThread() {
+ ALOGE_IF(pthread_equal(pthread_self(), mThread),
+ "%s() destructor running in thread", __func__);
+ ALOGE_IF(mHasThread, "%s() thread never joined", __func__);
+}
+void AAudioThread::setup(const char *prefix) {
// Name the thread with an increasing index, "prefix_#", for debugging.
uint32_t index = mNextThreadIndex++;
// Wrap the index so that we do not hit the 16 char limit
@@ -57,7 +60,7 @@
}
}
-// This is the entry point for the new thread created by createThread().
+// This is the entry point for the new thread created by createThread_l().
// It converts the 'C' function call to a C++ method call.
static void * AAudioThread_internalThreadProc(void *arg) {
AAudioThread *aaudioThread = (AAudioThread *) arg;
@@ -90,13 +93,18 @@
ALOGE("stop() but no thread running");
return AAUDIO_ERROR_INVALID_STATE;
}
+ // Check to see if the thread is trying to stop itself.
+ if (pthread_equal(pthread_self(), mThread)) {
+ ALOGE("%s() attempt to pthread_join() from launched thread!", __func__);
+ return AAUDIO_ERROR_INTERNAL;
+ }
+
int err = pthread_join(mThread, nullptr);
- mHasThread = false;
if (err != 0) {
ALOGE("stop() - pthread_join() returned %d %s", err, strerror(err));
return AAudioConvert_androidToAAudioResult(-err);
} else {
+ mHasThread = false;
return AAUDIO_OK;
}
}
-