AAudioService: add dumpsys capability
Test: adb shell dumpsys media.aaudio
Bug: 38396780
Change-Id: I8b5c421bdd1b3228d8140816a68740709aa9757b
diff --git a/media/libaaudio/src/utility/AAudioUtilities.h b/media/libaaudio/src/utility/AAudioUtilities.h
index f894bc0..efd663d 100644
--- a/media/libaaudio/src/utility/AAudioUtilities.h
+++ b/media/libaaudio/src/utility/AAudioUtilities.h
@@ -17,6 +17,8 @@
#ifndef UTILITY_AAUDIO_UTILITIES_H
#define UTILITY_AAUDIO_UTILITIES_H
+#include <algorithm>
+#include <functional>
#include <stdint.h>
#include <sys/types.h>
@@ -211,4 +213,27 @@
*/
int32_t AAudioProperty_getHardwareBurstMinMicros();
+/**
+ * Try a function f until it returns true.
+ *
+ * The function is always called at least once.
+ *
+ * @param f the function to evaluate, which returns a bool.
+ * @param times the number of times to evaluate f.
+ * @param sleepMs the sleep time per check of f, if greater than 0.
+ * @return true if f() eventually returns true.
+ */
+static inline bool AAudio_tryUntilTrue(
+ std::function<bool()> f, int times, int sleepMs) {
+ static const useconds_t US_PER_MS = 1000;
+
+ sleepMs = std::max(sleepMs, 0);
+ for (;;) {
+ if (f()) return true;
+ if (times <= 1) return false;
+ --times;
+ usleep(sleepMs * US_PER_MS);
+ }
+}
+
#endif //UTILITY_AAUDIO_UTILITIES_H
diff --git a/media/libaaudio/src/utility/HandleTracker.cpp b/media/libaaudio/src/utility/HandleTracker.cpp
index f957234..d4202db 100644
--- a/media/libaaudio/src/utility/HandleTracker.cpp
+++ b/media/libaaudio/src/utility/HandleTracker.cpp
@@ -20,11 +20,15 @@
#include <utils/Log.h>
#include <assert.h>
+#include <functional>
+#include <iomanip>
#include <new>
+#include <sstream>
#include <stdint.h>
#include <utils/Mutex.h>
#include <aaudio/AAudio.h>
+#include "AAudioUtilities.h"
#include "HandleTracker.h"
using android::Mutex;
@@ -93,6 +97,46 @@
return mHandleAddresses != nullptr;
}
+
+
+std::string HandleTracker::dump() const {
+ if (!isInitialized()) {
+ return "HandleTracker is not initialized\n";
+ }
+
+ std::stringstream result;
+ const bool isLocked = AAudio_tryUntilTrue(
+ [this]()->bool { return mLock.tryLock(); } /* f */,
+ 50 /* times */,
+ 20 /* sleepMs */);
+ if (!isLocked) {
+ result << "HandleTracker may be deadlocked\n";
+ }
+
+ result << "Handles:\n";
+ // atLineStart() can be changed to support an arbitrary line breaking algorithm;
+ // it should return true when a new line starts.
+ // For simplicity, we will use a constant 16 items per line.
+ const auto atLineStart = [](int index) -> bool {
+ // Magic constant of 0xf used for mask to detect start every 16 items.
+ return (index & 0xf) == 0; };
+ const auto atLineEnd = [this, &atLineStart](int index) -> bool {
+ return atLineStart(index + 1) || index == mMaxHandleCount - 1; };
+
+ for (int i = 0; i < mMaxHandleCount; ++i) {
+ if (atLineStart(i)) {
+ result << " ";
+ }
+ result << std::hex << std::setw(4) << std::setfill('0') << mHandleHeaders[i]
+ << (atLineEnd(i) ? "\n" : " ");
+ }
+
+ if (isLocked) {
+ mLock.unlock();
+ }
+ return result.str();
+}
+
handle_tracker_slot_t HandleTracker::allocateSlot_l() {
void **allocated = mNextFreeAddress;
if (allocated == nullptr) {
diff --git a/media/libaaudio/src/utility/HandleTracker.h b/media/libaaudio/src/utility/HandleTracker.h
index 23a73ed..a4c51c0 100644
--- a/media/libaaudio/src/utility/HandleTracker.h
+++ b/media/libaaudio/src/utility/HandleTracker.h
@@ -18,6 +18,7 @@
#define UTILITY_HANDLE_TRACKER_H
#include <stdint.h>
+#include <string>
#include <utils/Mutex.h>
typedef int32_t aaudio_handle_t;
@@ -53,6 +54,18 @@
bool isInitialized() const;
/**
+ * Returns HandleTracker information.
+ *
+ * Will attempt to get the object lock, but will proceed
+ * even if it cannot.
+ *
+ * Each line of information ends with a newline.
+ *
+ * @return a string representing the HandleTracker info.
+ */
+ std::string dump() const;
+
+ /**
* Store a pointer and return a handle that can be used to retrieve the pointer.
*
* It is safe to call put() or remove() from multiple threads.
@@ -99,7 +112,7 @@
// This Mutex protects the linked list of free nodes.
// The list is managed using mHandleAddresses and mNextFreeAddress.
// The data in mHandleHeaders is only changed by put() and remove().
- android::Mutex mLock;
+ mutable android::Mutex mLock;
/**
* Pull slot off of a list of empty slots.