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Commit 69bfb1f0 authored by Glenn Kasten's avatar Glenn Kasten
Browse files

Scheduling group cleanup - add comment, SP_DEFAULT 

Also tid == 0 maps to gettid() on platforms that support it.
This is needed by mediaserver code that was formerly using
the old C++ API.

Change-Id: I8baaa3e42315c9b924cec26b6da01e7cb69e0078
parent c28cbb2c

include/cutils/sched_policy.h

+5 −0
Original line number Diff line number Diff line
@@ -21,21 +21,26 @@ 
extern "C" {

#endif



/* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */

typedef enum {

    SP_DEFAULT    = -1,

    SP_BACKGROUND = 0,

    SP_FOREGROUND = 1,

    SP_CNT,

    SP_MAX        = SP_CNT - 1,

    SP_SYSTEM_DEFAULT = SP_FOREGROUND,

} SchedPolicy;



/* Assign thread tid to the cgroup associated with the specified policy.

 * If the thread is a thread group leader, that is it's gettid() == getpid(),

 * then the other threads in the same thread group are _not_ affected.

 * On platforms which support gettid(), zero tid means current thread.

 * Return value: 0 for success, or -errno for error.

 */

extern int set_sched_policy(int tid, SchedPolicy policy);



/* Return the policy associated with the cgroup of thread tid via policy pointer.

 * On platforms which support gettid(), zero tid means current thread.

 * Return value: 0 for success, or -1 for error and set errno.

 */

extern int get_sched_policy(int tid, SchedPolicy *policy);

libcutils/sched_policy.c

+21 −0
Original line number Diff line number Diff line
@@ -189,6 +189,11 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen) 


int get_sched_policy(int tid, SchedPolicy *policy)

{

#ifdef HAVE_GETTID

    if (tid == 0) {

        tid = gettid();

    }

#endif

    pthread_once(&the_once, __initialize);



    if (__sys_supports_schedgroups) {
@@ -219,8 +224,23 @@ int get_sched_policy(int tid, SchedPolicy *policy) 
    return 0;

}



/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged.

 * Call this any place a SchedPolicy is used as an input parameter.

 * Returns the possibly re-mapped policy.

 */

static inline SchedPolicy _policy(SchedPolicy p)

{

   return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p;

}



int set_sched_policy(int tid, SchedPolicy policy)

{

#ifdef HAVE_GETTID

    if (tid == 0) {

        tid = gettid();

    }

#endif

    policy = _policy(policy);

    pthread_once(&the_once, __initialize);



#if POLICY_DEBUG
@@ -275,6 +295,7 @@ int set_sched_policy(int tid, SchedPolicy policy) 


const char *get_sched_policy_name(SchedPolicy policy)

{

    policy = _policy(policy);

    static const char * const strings[SP_CNT] = {

       [SP_BACKGROUND] = "bg",

       [SP_FOREGROUND] = "fg",