1 files changed, 94 insertions, 0 deletions
diff --git a/services/camera/libcameraservice/utils/CameraTraces.cpp b/services/camera/libcameraservice/utils/CameraTraces.cpp
new file mode 100644
index 0000000..346e15f
--- /dev/null
+++ b/services/camera/libcameraservice/utils/CameraTraces.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "CameraTraces"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+#include "utils/CameraTraces.h"
+#include <utils/ProcessCallStack.h>
+
+#include <utils/Mutex.h>
+#include <utils/List.h>
+
+#include <utils/Log.h>
+#include <cutils/trace.h>
+
+namespace android {
+namespace camera3 {
+
+struct CameraTracesImpl {
+    Mutex                    tracesLock;
+    List<ProcessCallStack>   pcsList;
+}; // class CameraTraces::Impl;
+
+static CameraTracesImpl gImpl;
+CameraTracesImpl& CameraTraces::sImpl = gImpl;
+
+void CameraTraces::saveTrace() {
+    ALOGV("%s: begin", __FUNCTION__);
+    ATRACE_BEGIN("CameraTraces::saveTrace");
+    Mutex::Autolock al(sImpl.tracesLock);
+
+    List<ProcessCallStack>& pcsList = sImpl.pcsList;
+
+    // Insert new ProcessCallStack, and immediately crawl all the threads
+    pcsList.push_front(ProcessCallStack());
+    ProcessCallStack& pcs = *pcsList.begin();
+    pcs.update();
+
+    if (pcsList.size() > MAX_TRACES) {
+        // Prune list periodically and discard oldest entry
+        pcsList.erase(--pcsList.end());
+    }
+
+    IF_ALOGV() {
+        pcs.log(LOG_TAG, ANDROID_LOG_VERBOSE);
+    }
+
+    ALOGD("Process trace saved. Use dumpsys media.camera to view.");
+
+    ATRACE_END();
+}
+
+status_t CameraTraces::dump(int fd, const Vector<String16> &args __attribute__((unused))) {
+    ALOGV("%s: fd = %d", __FUNCTION__, fd);
+    Mutex::Autolock al(sImpl.tracesLock);
+    List<ProcessCallStack>& pcsList = sImpl.pcsList;
+
+    if (fd < 0) {
+        ALOGW("%s: Negative FD (%d)", __FUNCTION__, fd);
+        return BAD_VALUE;
+    }
+
+    fdprintf(fd, "Camera traces (%zu):\n", pcsList.size());
+
+    if (pcsList.empty()) {
+        fdprintf(fd, "  No camera traces collected.\n");
+    }
+
+    // Print newest items first
+    List<ProcessCallStack>::iterator it, end;
+    for (it = pcsList.begin(), end = pcsList.end(); it != end; ++it) {
+        const ProcessCallStack& pcs = *it;
+        pcs.dump(fd, DUMP_INDENT);
+    }
+
+    return OK;
+}
+
+}; // namespace camera3
+}; // namespace android