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#include "schedulingpolicyservice.h"
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <cutils/sched_policy.h>
#include <sched.h>
using namespace android;
enum {
REQUEST_PRIORITY_TRANSACTION = IBinder::FIRST_CALL_TRANSACTION
};
#define PRIORITY_MIN 1
#define PRIORITY_MAX 2
SchedulingPolicyService::SchedulingPolicyService()
{
}
void SchedulingPolicyService::instantiate()
{
defaultServiceManager()->addService(String16("scheduling_policy"), new SchedulingPolicyService);
}
status_t SchedulingPolicyService::onTransact(uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags)
{
switch (code) {
case REQUEST_PRIORITY_TRANSACTION: {
CHECK_INTERFACE(ISchedulingPolicyService, data, reply);
int32_t pid = data.readInt32();
int32_t tid = data.readInt32();
int32_t prio = data.readInt32();
int res = requestPriority(pid, tid, prio);
reply->writeNoException();
reply->writeInt32(res);
return NO_ERROR;
} break;
default:
return BBinder::onTransact(code, data, reply, flags);
}
}
int SchedulingPolicyService::requestPriority(int32_t pid, int32_t tid, int32_t prio)
{
if (prio < PRIORITY_MIN || prio > PRIORITY_MAX)
return PERMISSION_DENIED;
int res = set_sched_policy(tid, IPCThreadState::self()->getCallingPid() == pid ? SP_AUDIO_SYS
: SP_AUDIO_APP);
if (res != NO_ERROR)
return PERMISSION_DENIED;
struct sched_param param;
param.sched_priority = prio;
res = sched_setscheduler(tid, SCHED_FIFO, ¶m);
if (res)
return PERMISSION_DENIED;
return OK;
}
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