Joy of Think

Using the feature "inplace edit" of perl to do it:

find /path/to/start/from/ -type f | xargs perl -pi.old -e 's/applicationX/applicationY/g'

Find in ruby

Ruby has a module find which implement function as commnad "find".

Find.prune is used to stop recursive visit in following directory.

  require 'find'

  total_size = 0

  Find.find(ENV["HOME"]) do |path|
    if FileTest.directory?(path)
      if File.basename(path)[0] == ?.
        Find.prune       # Don't look any further into this directory.
      else
        next
      end
    else
      total_size += FileTest.size(path)
    end
  end

Cooperating with module such like File, using method like basename, extname, or Module FileTest, user can easy to implement find like functions.

Walk a directory/Recursively in Wikipedia

Wikipedia has a great page about work a directory recursively.

Download psshutdown from sysinternal.

psshutdown -h ---- hibernate system

ActivityManagerService

In frameworks/base/services/java/com/android/server/am/ActivityManagerService.java, serviceTimeout() is called when a service is timedout.

In this function, it will invoke appNotResponding() which calls dumpStackTrace() to dump all process stack into /data/anr/traces.txt.

Actually, dumpStackTrace() forces processes to dump their stacks by send SIG_QUIT(3).

By the way, if trace file name is not set, the ANR traces.file won't be created.

Detect ANR in service call

In function sendServiceArgsLocked() and other service related methods, first, it calls bumpServiceExecutingLocked(r, "start") which schdue a SERVCIE_TIMEOUT_MESSAGE in a furture time. So if service don't return inside SERVICE_TIMEOUT, ActivityManagerService would receive a SERVICE_TIMEOUT_MESSAGE and detect ANR.

Detect ANR in boradcast Receiver

Before send broadcast intent, setBroadcastTimeoutLocked()' is called which schedule aBROADCASTTIMEOUTMSGin the future. If this message is received, it means broadcast intent can't come back,appNotResponding()` is trigged in the last of call stack.

Detect ANR in InputService

If InputService can't get feedback in 5 seconds from user thread, it will call appNotResponding() to tigger ANR.

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