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.

1 files changed, 49 insertions, 0 deletions

diff --git a/libs/utils/Threads.cpp b/libs/utils/Threads.cpp
index ec3db09..6ca2603 100644
--- a/libs/utils/Threads.cpp
+++ b/libs/utils/Threads.cpp
@@ -20,6 +20,8 @@
 #include <utils/threads.h>
 #include <utils/Log.h>
 
+#include <cutils/sched_policy.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <memory.h>
@@ -269,6 +271,53 @@ void androidSetCreateThreadFunc(android_create_thread_fn func)
     gCreateThreadFn = func;
 }
 
+pid_t androidGetTid()
+{
+#ifdef HAVE_GETTID
+    return gettid();
+#else
+    return getpid();
+#endif
+}
+
+int androidSetThreadSchedulingGroup(pid_t tid, int grp)
+{
+    if (grp > ANDROID_TGROUP_MAX || grp < 0) { 
+        return BAD_VALUE;
+    }
+
+    if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
+                                      SP_BACKGROUND : SP_FOREGROUND)) {
+        return PERMISSION_DENIED;
+    }
+    
+    return NO_ERROR;
+}
+
+int androidSetThreadPriority(pid_t tid, int pri)
+{
+    int rc = 0;
+    int lasterr = 0;
+
+    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
+        rc = set_sched_policy(tid, SP_BACKGROUND);
+    } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) {
+        rc = set_sched_policy(tid, SP_FOREGROUND);
+    }
+
+    if (rc) {
+        lasterr = errno;
+    }
+
+    if (setpriority(PRIO_PROCESS, tid, pri) < 0) {
+        rc = INVALID_OPERATION;
+    } else {
+        errno = lasterr;
+    }
+    
+    return rc;
+}
+
 namespace android {
 
 /*