Android2.1源码中的一个bug

最近在移植Android到MIPS平台，启动的时候发现永远停留在开机动画上面，不能继续往下走了。经过仔细分析源码，发现明显是的 Android2.1的bug。并且这个问题涉及到多线程竞争，和时序有关，你不知道什么时候你的机器就会遇到同样的。在此和大家一起分享，希望遇到我同样问题的朋友能少些困扰。

如下是我开机的logcat的log：

I/vold ( 1418): Android Volume Daemon version 2.0

E/vold ( 1418): Unable to open ‘/sys/class/switch’ (No such file or directory)

D/vold ( 1418): Bootstrapping complete

D/AndroidRuntime( 1421):

D/AndroidRuntime( 1421): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<

D/AndroidRuntime( 1421): CheckJNI is ON

I/ ( 1422): ServiceManager: 0x82d08

W/AudioHardwareInterface( 1422): Using stubbed audio hardware. No sound will be produced.

D/AudioHardwareInterface( 1422): setMode(NORMAL)

I/CameraService( 1422): CameraService started: pid=1422

I/AudioFlinger( 1422): AudioFlinger’s thread 0×83340 ready to run

D/AndroidRuntime( 1421): — registering native functions —

I/SamplingProfilerIntegration( 1421): Profiler is disabled.

I/Zygote ( 1421): Preloading classes…

D/dalvikvm( 1421): GC freed 791 objects / 50440 bytes in 4ms

D/dalvikvm( 1421): GC freed 255 objects / 16392 bytes in 290ms

D/dalvikvm( 1421): GC freed 298 objects / 19120 bytes in 291ms

D/dalvikvm( 1421): GC freed 222 objects / 14224 bytes in 284ms

D/dalvikvm( 1421): GC freed 415 objects / 26456 bytes in 292ms

D/skia ( 1421): —— build_power_table 1.4

D/skia ( 1421): —— build_power_table 0.714286

D/dalvikvm( 1421): GC freed 419 objects / 28904 bytes in 292ms

D/dalvikvm( 1421): Trying to load lib /system/lib/libmedia_jni.so 0×0