设置线程的优先级

sched_get_priority_max //获取当前线程最大优先级

pid_t dvrPid = -1;
pid_t exitDvr = -1;
int status = 0;
int ret = APP_OK;
pthread_t tid;
pthread_attr_t attr;
int policy = 0;
struct sched_param param = {0};

sched_get_priority_max(policy);

pthread_attr_init(&attr);
pthread_attr_getschedparam(&attr, ¶m);
param.sched_priority = policy;
pthread_attr_setschedparam(&attr, ¶m);

pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS);
ret = lthread_create(&tid, &attr, smwatchDogThread, NULL);
if(APP_OK != ret)
{
dbgPrintfl(WARN,"readKeyThread create  fail\n");
ret = APP_FAIL;
}