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am f703b77c: Merge "Add system property to turn off scheduling groups." into gingerbread

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Merge commit 'f703b77c96a6d133fda534158eaf6190ff7c87f7' into gingerbread-plus-aosp

* commit 'f703b77c96a6d133fda534158eaf6190ff7c87f7':
  Add system property to turn off scheduling groups.
This commit is contained in:
Dianne Hackborn 2010-09-07 11:30:08 -07:00 committed by Android Git Automerger
commit c21e0e2d0c
1 changed files with 29 additions and 8 deletions
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37
libs/utils/Threads.cpp
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@ -21,6 +21,7 @@
#include <utils/Log.h>
#include <cutils/sched_policy.h>
#include <cutils/properties.h>
#include <stdio.h>
#include <stdlib.h>
@ -57,7 +58,7 @@ using namespace android;
// ----------------------------------------------------------------------------
/*
* Create and run a new thead.
* Create and run a new thread.
*
* We create it "detached", so it cleans up after itself.
*/
@ -280,6 +281,20 @@ pid_t androidGetTid()
#endif
}
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;
}
}
}
int androidSetThreadSchedulingGroup(pid_t tid, int grp)
{
if (grp > ANDROID_TGROUP_MAX || grp < 0) {
@ -287,9 +302,12 @@ int androidSetThreadSchedulingGroup(pid_t tid, int grp)
}
#if defined(HAVE_PTHREADS)
if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
SP_BACKGROUND : SP_FOREGROUND)) {
return PERMISSION_DENIED;
pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);
if (gDoSchedulingGroup) {
if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
SP_BACKGROUND : SP_FOREGROUND)) {
return PERMISSION_DENIED;
}
}
#endif
@ -303,10 +321,13 @@ int androidSetThreadPriority(pid_t tid, int pri)
#if defined(HAVE_PTHREADS)
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);
pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);
if (gDoSchedulingGroup) {
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) {