Merge "rust: Mark DeathRecipient Send and Sync"

    cookie_decr_refcount: unsafe extern "C" fn(*mut c_void),

}

/// # Safety

///

/// A `DeathRecipient` is a wrapper around `AIBinder_DeathRecipient` and a pointer

/// to a `Fn` which is `Sync` and `Send` (the cookie field). As

/// `AIBinder_DeathRecipient` is threadsafe, this structure is too.

unsafe impl Send for DeathRecipient {}

/// # Safety

///

/// A `DeathRecipient` is a wrapper around `AIBinder_DeathRecipient` and a pointer

/// to a `Fn` which is `Sync` and `Send` (the cookie field). As

/// `AIBinder_DeathRecipient` is threadsafe, this structure is too.

unsafe impl Sync for DeathRecipient {}

impl DeathRecipient {

    /// Create a new death recipient that will call the given callback when its

    /// associated object dies.