audio_mutex: Add mutex priority inheritance flag

// media_audio namespace flags

// aconfig_audio_flags is for general multi-project audio flags.

aconfig_declarations {

    name: "aconfig_audio_flags",

    package: "com.android.media.audio.flags",

    srcs: ["audio_flags.aconfig"],

}

cc_aconfig_library {

    name: "aconfig_audio_flags_c_lib",

    aconfig_declarations: "aconfig_audio_flags",

    // This does not properly link with the

    // libaudioutils library -- the vndk

    // requirement needs a signature update.

    double_loadable: true,

    host_supported: true,

    product_available: true,

    vendor_available: true,

    apex_available: [

        "//apex_available:platform",

    ],

}

package: "com.android.media.audio.flags"

# General multi-project audio flags.

#

# Please add flags in alphabetical order.

flag {

    name: "mutex_priority_inheritance"

    namespace: "media_audio"

    description: "\

Enable mutex priority inheritance in audioserver \

(std::mutex does not normally transfer priority from \

the blocked thread to the blocking thread).  \

This feature helps reduce audio glitching caused by low priority \

blocking threads."

    bug: "209491695"

}

        "libaudiohal",

        "libaudioprocessing",

        "libaudioutils",

        "libaudioutils_nonvndk",

        "libcutils",

        "libutils",

        "liblog",