Propagate background scheduling class across processes.

This is a very simply implementation: upon receiving an IPC, if the handling
thread is at a background priority (the driver will have taken care of
propagating this from the calling thread), then stick it in to the background
scheduling group.  Plus an API to turn this off for the process, which is
used by the system process.

This also pulls some of the code for managing scheduling classes out of
the Process JNI wrappers and in to some convenience methods in thread.h.

2 files changed, 10 insertions, 2 deletions

diff --git a/include/binder/IBinder.h b/include/binder/IBinder.h
index 884b5c1..749a977 100644
--- a/include/binder/IBinder.h
+++ b/include/binder/IBinder.h
@@ -52,7 +52,7 @@ public:
         DUMP_TRANSACTION        = B_PACK_CHARS('_','D','M','P'),
         INTERFACE_TRANSACTION   = B_PACK_CHARS('_', 'N', 'T', 'F'),
 
-        // Corresponds to tfOneWay -- an asynchronous call.
+        // Corresponds to TF_ONE_WAY -- an asynchronous call.
         FLAG_ONEWAY             = 0x00000001
     };
 
diff --git a/include/binder/IPCThreadState.h b/include/binder/IPCThreadState.h
index 78306b2..3ab985d 100644
--- a/include/binder/IPCThreadState.h
+++ b/include/binder/IPCThreadState.h
@@ -68,6 +68,13 @@ public:
 
     static  void                shutdown();
     
+    // Call this to disable switching threads to background scheduling when
+    // receiving incoming IPC calls.  This is specifically here for the
+    // Android system process, since it expects to have background apps calling
+    // in to it but doesn't want to acquire locks in its services while in
+    // the background.
+    static  void                disableBackgroundScheduling(bool disable);
+    
 private:
                                 IPCThreadState();
                                 ~IPCThreadState();
@@ -93,9 +100,10 @@ private:
                                            void* cookie);
     
     const   sp<ProcessState>    mProcess;
+    const   pid_t               mMyThreadId;
             Vector<BBinder*>    mPendingStrongDerefs;
             Vector<RefBase::weakref_type*> mPendingWeakDerefs;
-                                
+            
             Parcel              mIn;
             Parcel              mOut;
             status_t            mLastError;