Merge "Thread ID zero for androidSetThreadSchedulingGroup"

// Change the scheduling group of a particular thread.  The group

// should be one of the ANDROID_TGROUP constants.  Returns BAD_VALUE if

// grp is out of range, else another non-zero value with errno set if

// the operation failed.

// the operation failed.  Thread ID zero means current thread.

extern int androidSetThreadSchedulingGroup(pid_t tid, int grp);

// Change the priority AND scheduling group of a particular thread.  The priority

// should be one of the ANDROID_PRIORITY constants.  Returns INVALID_OPERATION

// if the priority set failed, else another value if just the group set failed;

// in either case errno is set.

// in either case errno is set.  Thread ID zero means current thread.

extern int androidSetThreadPriority(pid_t tid, int prio);

#ifdef __cplusplus

#if defined(HAVE_PTHREADS)

    pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);

    if (gDoSchedulingGroup) {

        // set_sched_policy does not support tid == 0

        if (tid == 0) {

            tid = androidGetTid();

        }

        if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?

                                          SP_BACKGROUND : SP_FOREGROUND)) {

            return PERMISSION_DENIED;