libstagefright: add ProcessInfo to get process priority.

Bug: 19620911
Change-Id: I240b814b8925b1d6266e6f998a7debd654a2145a

1 files changed, 53 insertions, 0 deletions

diff --git a/media/libstagefright/ProcessInfo.cpp b/media/libstagefright/ProcessInfo.cpp
new file mode 100644
index 0000000..b4172b3
--- /dev/null
+++ b/media/libstagefright/ProcessInfo.cpp
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2015 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_NDEBUG 0
+#define LOG_TAG "ProcessInfo"
+#include <utils/Log.h>
+
+#include <media/stagefright/ProcessInfo.h>
+
+#include <binder/IProcessInfoService.h>
+#include <binder/IServiceManager.h>
+
+namespace android {
+
+ProcessInfo::ProcessInfo() {}
+
+bool ProcessInfo::getPriority(int pid, int* priority) {
+    sp<IBinder> binder = defaultServiceManager()->getService(String16("processinfo"));
+    sp<IProcessInfoService> service = interface_cast<IProcessInfoService>(binder);
+
+    size_t length = 1;
+    int32_t states;
+    status_t err = service->getProcessStatesFromPids(length, &pid, &states);
+    if (err != OK) {
+        ALOGE("getProcessStatesFromPids failed");
+        return false;
+    }
+    ALOGV("pid %d states %d", pid, states);
+    if (states < 0) {
+        return false;
+    }
+
+    // Use process state as the priority. Lower the value, higher the priority.
+    *priority = states;
+    return true;
+}
+
+ProcessInfo::~ProcessInfo() {}
+
+}  // namespace android