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      1 /******************************************************************************
      2  *
      3  *  Copyright (C) 2012 Broadcom Corporation
      4  *
      5  *  Licensed under the Apache License, Version 2.0 (the "License");
      6  *  you may not use this file except in compliance with the License.
      7  *  You may obtain a copy of the License at:
      8  *
      9  *  http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  *
     17  ******************************************************************************/
     18 
     19 /************************************************************************************
     20  *
     21  *  Filename:      bt_utils.c
     22  *
     23  *  Description:   Miscellaneous helper functions
     24  *
     25  *
     26  ***********************************************************************************/
     27 
     28 #include <cutils/properties.h>
     29 #include <cutils/sched_policy.h>
     30 #include <errno.h>
     31 #include <pthread.h>
     32 #include <sys/resource.h>
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <unistd.h>
     36 #include <utils/ThreadDefs.h>
     37 
     38 #define LOG_TAG "BT_UTILS"
     39 
     40 #include <utils/Log.h>
     41 
     42 #include "data_types.h"
     43 #include "bt_utils.h"
     44 
     45 
     46 /*******************************************************************************
     47 **  Type definitions for callback functions
     48 ********************************************************************************/
     49 static pthread_once_t g_DoSchedulingGroupOnce[TASK_HIGH_MAX];
     50 static BOOLEAN g_DoSchedulingGroup[TASK_HIGH_MAX];
     51 static pthread_mutex_t         gIdxLock;
     52 static int g_TaskIdx;
     53 
     54 /*****************************************************************************
     55 **
     56 ** Function        bt_utils_init
     57 **
     58 ** Description     Initialize bluedroid util
     59 **
     60 ** Returns         void
     61 **
     62 *******************************************************************************/
     63 void bt_utils_init() {
     64     int i;
     65     pthread_mutexattr_t lock_attr;
     66 
     67     for(i = 0; i < TASK_HIGH_MAX; i++) {
     68         g_DoSchedulingGroupOnce[i] = PTHREAD_ONCE_INIT;
     69         g_DoSchedulingGroup[i] = TRUE;
     70     }
     71     pthread_mutexattr_init(&lock_attr);
     72     pthread_mutex_init(&gIdxLock, &lock_attr);
     73 }
     74 
     75 /*****************************************************************************
     76 **
     77 ** Function        bt_utils_cleanup
     78 **
     79 ** Description     Clean up bluedroid util
     80 **
     81 ** Returns         void
     82 **
     83 *******************************************************************************/
     84 void bt_utils_cleanup() {
     85     pthread_mutex_destroy(&gIdxLock);
     86 }
     87 
     88 /*****************************************************************************
     89 **
     90 ** Function        check_do_scheduling_group
     91 **
     92 ** Description     check if it is ok to change schedule group
     93 **
     94 ** Returns         void
     95 **
     96 *******************************************************************************/
     97 static void check_do_scheduling_group(void) {
     98     char buf[PROPERTY_VALUE_MAX];
     99     int len = property_get("debug.sys.noschedgroups", buf, "");
    100     if (len > 0) {
    101         int temp;
    102         if (sscanf(buf, "%d", &temp) == 1) {
    103             g_DoSchedulingGroup[g_TaskIdx] = temp == 0;
    104         }
    105     }
    106 }
    107 
    108 /*****************************************************************************
    109 **
    110 ** Function        raise_priority_a2dp
    111 **
    112 ** Description     Raise task priority for A2DP streaming
    113 **
    114 ** Returns         void
    115 **
    116 *******************************************************************************/
    117 void raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task) {
    118     int rc = 0;
    119     int tid = gettid();
    120 
    121     pthread_mutex_lock(&gIdxLock);
    122     g_TaskIdx = high_task;
    123 
    124     pthread_once(&g_DoSchedulingGroupOnce[g_TaskIdx], check_do_scheduling_group);
    125     if (g_DoSchedulingGroup[g_TaskIdx]) {
    126         // set_sched_policy does not support tid == 0
    127         rc = set_sched_policy(tid, SP_FOREGROUND);
    128     }
    129     pthread_mutex_unlock(&gIdxLock);
    130 
    131     if (rc) {
    132         ALOGW("failed to change sched policy, tid %d, err: %d", tid, errno);
    133     }
    134 
    135     if (setpriority(PRIO_PROCESS, tid, ANDROID_PRIORITY_AUDIO) < 0) {
    136         ALOGW("failed to change priority tid: %d to %d", tid, ANDROID_PRIORITY_AUDIO);
    137     }
    138 }
    139 
    140