From d98885c128e7045da244098d82751da6e792d677 Mon Sep 17 00:00:00 2001
From: Dianne Hackborn <hackbod@google.com>
Date: Tue, 1 Mar 2016 17:13:03 -0800
Subject: [PATCH] Add APIs to find out the time when a process was created.

Change-Id: Id0d12c377f278fec6e31a98eab0c865a23c006ec
---
 api/current.txt                           |  2 ++
 api/system-current.txt                    |  2 ++
 api/test-current.txt                      |  2 ++
 core/java/android/app/ActivityThread.java |  3 +++
 core/java/android/os/Process.java         | 23 +++++++++++++++++++++++
 5 files changed, 32 insertions(+)

diff --git a/api/current.txt b/api/current.txt
index aeaae55833042..ce7ba46851e51 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -29104,6 +29104,8 @@ package android.os {
     ctor public Process();
     method public static final long getElapsedCpuTime();
     method public static final int getGidForName(java.lang.String);
+    method public static final long getStartElapsedRealtime();
+    method public static final long getStartUptimeMillis();
     method public static final int getThreadPriority(int) throws java.lang.IllegalArgumentException;
     method public static final int getUidForName(java.lang.String);
     method public static final boolean is64Bit();
diff --git a/api/system-current.txt b/api/system-current.txt
index 1a2c8547fa8cb..e4f7caa475067 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -31396,6 +31396,8 @@ package android.os {
     ctor public Process();
     method public static final long getElapsedCpuTime();
     method public static final int getGidForName(java.lang.String);
+    method public static final long getStartElapsedRealtime();
+    method public static final long getStartUptimeMillis();
     method public static final int getThreadPriority(int) throws java.lang.IllegalArgumentException;
     method public static final int getUidForName(java.lang.String);
     method public static final boolean is64Bit();
diff --git a/api/test-current.txt b/api/test-current.txt
index 1039fed4ac4f6..c220c6d995a80 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -29115,6 +29115,8 @@ package android.os {
     ctor public Process();
     method public static final long getElapsedCpuTime();
     method public static final int getGidForName(java.lang.String);
+    method public static final long getStartElapsedRealtime();
+    method public static final long getStartUptimeMillis();
     method public static final int getThreadPriority(int) throws java.lang.IllegalArgumentException;
     method public static final int getUidForName(java.lang.String);
     method public static final boolean is64Bit();
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index 1e95c983a84fd..2415ce1d946f4 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -4909,6 +4909,9 @@ public final class ActivityThread {
             DdmVmInternal.enableRecentAllocations(true);
         }
 
+        // Note when this process has started.
+        Process.setStartTimes(SystemClock.elapsedRealtime(), SystemClock.uptimeMillis());
+
         mBoundApplication = data;
         mConfiguration = new Configuration(data.config);
         mCompatConfiguration = new Configuration(data.config);
diff --git a/core/java/android/os/Process.java b/core/java/android/os/Process.java
index 9984755d316fb..8fd3b0c0035f8 100644
--- a/core/java/android/os/Process.java
+++ b/core/java/android/os/Process.java
@@ -383,6 +383,9 @@ public class Process {
     public static final int SIGNAL_KILL = 9;
     public static final int SIGNAL_USR1 = 10;
 
+    private static long sStartElapsedRealtime;
+    private static long sStartUptimeMillis;
+
     /**
      * State for communicating with the zygote process.
      *
@@ -771,6 +774,26 @@ public class Process {
      */
     public static final native long getElapsedCpuTime();
 
+    /**
+     * Return the {@link SystemClock#elapsedRealtime()} at which this process was started.
+     */
+    public static final long getStartElapsedRealtime() {
+        return sStartElapsedRealtime;
+    }
+
+    /**
+     * Return the {@link SystemClock#uptimeMillis()} at which this process was started.
+     */
+    public static final long getStartUptimeMillis() {
+        return sStartUptimeMillis;
+    }
+
+    /** @hide */
+    public static final void setStartTimes(long elapsedRealtime, long uptimeMillis) {
+        sStartElapsedRealtime = elapsedRealtime;
+        sStartUptimeMillis = uptimeMillis;
+    }
+
     /**
      * Returns true if the current process is a 64-bit runtime.
      */