Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4fb24275 authored by Glenn Kasten's avatar Glenn Kasten
Browse files

Add C++ thread API androidGetThreadSchedulingGroup 

This API is intended for applications that need to read a thread's
scheduling group, while using the higher-level (C++) family of thread APIs.

Change-Id: I5e58017f74c3989b20b5b1cc2bc4483c95720520
parent 555b49d0

include/utils/threads.h

+7 −0
Original line number Diff line number Diff line
@@ -142,6 +142,13 @@ extern int androidSetThreadSchedulingGroup(pid_t tid, int grp); 
// in either case errno is set.  Thread ID zero means current thread.

extern int androidSetThreadPriority(pid_t tid, int prio);



// Get the current scheduling group of a particular thread. Normally returns

// one of the ANDROID_TGROUP constants other than ANDROID_TGROUP_DEFAULT.

// Returns ANDROID_TGROUP_DEFAULT if no pthread support (e.g. on host) or if

// scheduling groups are disabled.  Returns INVALID_OPERATION if unexpected error.

// Thread ID zero means current thread.

extern int androidGetThreadSchedulingGroup(pid_t tid);



#ifdef __cplusplus

}

#endif

libs/utils/Threads.cpp

+35 −0
Original line number Diff line number Diff line
@@ -367,6 +367,41 @@ int androidSetThreadPriority(pid_t tid, int pri) 
    return rc;

}



int androidGetThreadSchedulingGroup(pid_t tid)

{

    int ret = ANDROID_TGROUP_DEFAULT;



#if defined(HAVE_PTHREADS)

    // convention is to not call get/set_sched_policy methods if disabled by property

    pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup);

    if (gDoSchedulingGroup) {

        SchedPolicy policy;

        // get_sched_policy does not support tid == 0

        if (tid == 0) {

            tid = androidGetTid();

        }

        if (get_sched_policy(tid, &policy) < 0) {

            ret = INVALID_OPERATION;

        } else {

            switch (policy) {

            case SP_BACKGROUND:

                ret = ANDROID_TGROUP_BG_NONINTERACT;

                break;

            case SP_FOREGROUND:

                ret = ANDROID_TGROUP_FG_BOOST;

                break;

            default:

                // should not happen, as enum SchedPolicy does not have any other values

                ret = INVALID_OPERATION;

                break;

            }

        }

    }

#endif



    return ret;

}



namespace android {



/*