From b2cac4ff37ed2a3521efb307b807b12f649634b8 Mon Sep 17 00:00:00 2001
From: Glenn Kasten <gkasten@google.com>
Date: Mon, 30 Apr 2012 16:03:30 -0700
Subject: [PATCH] Continue removing property debug.sys.noschedgroups

Also 0 means gettid() for get_sched_policy() and set_sched_policy().

Change-Id: Ic12edc3df6c9b3e99eae5cffaf9f6fe56cf14043
---
 libs/utils/Threads.cpp | 45 ++++++++----------------------------------
 1 file changed, 8 insertions(+), 37 deletions(-)

diff --git a/libs/utils/Threads.cpp b/libs/utils/Threads.cpp
index a25a81fbe..f201fc744 100644
--- a/libs/utils/Threads.cpp
+++ b/libs/utils/Threads.cpp
@@ -68,20 +68,6 @@ using namespace android;
 
 typedef void* (*android_pthread_entry)(void*);
 
-static pthread_once_t gDoSchedulingGroupOnce = PTHREAD_ONCE_INIT;
-static bool gDoSchedulingGroup = true;
-
-static void checkDoSchedulingGroup(void) {
-    char buf[PROPERTY_VALUE_MAX];
-    int len = property_get("debug.sys.noschedgroups", buf, "");
-    if (len > 0) {
-        int temp;
-        if (sscanf(buf, "%d", &temp) == 1) {
-            gDoSchedulingGroup = temp == 0;
-        }
-    }
-}
-
 struct thread_data_t {
     thread_func_t   entryFunction;
     void*           userData;
@@ -97,15 +83,10 @@ struct thread_data_t {
         char * name = t->threadName;
         delete t;
         setpriority(PRIO_PROCESS, 0, prio);
-        pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);
-        if (gDoSchedulingGroup) {
-            if (prio >= ANDROID_PRIORITY_BACKGROUND) {
-                set_sched_policy(androidGetTid(), SP_BACKGROUND);
-            } else if (prio > ANDROID_PRIORITY_AUDIO) {
-                set_sched_policy(androidGetTid(), SP_FOREGROUND);
-            } else {
-                // defaults to that of parent, or as set by requestPriority()
-            }
+        if (prio >= ANDROID_PRIORITY_BACKGROUND) {
+            set_sched_policy(0, SP_BACKGROUND);
+        } else {
+            set_sched_policy(0, SP_FOREGROUND);
         }
         
         if (name) {
@@ -333,20 +314,10 @@ int androidSetThreadPriority(pid_t tid, int pri)
 #if defined(HAVE_PTHREADS)
     int lasterr = 0;
 
-    pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);
-    if (gDoSchedulingGroup) {
-        // set_sched_policy does not support tid == 0
-        int policy_tid;
-        if (tid == 0) {
-            policy_tid = androidGetTid();
-        } else {
-            policy_tid = tid;
-        }
-        if (pri >= ANDROID_PRIORITY_BACKGROUND) {
-            rc = set_sched_policy(policy_tid, SP_BACKGROUND);
-        } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) {
-            rc = set_sched_policy(policy_tid, SP_FOREGROUND);
-        }
+    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) {