Function pw_data_loop_invoke

pub unsafe extern "C" fn pw_data_loop_invoke(
    loop_: *mut pw_data_loop,
    func: spa_invoke_func_t,
    seq: u32,
    data: *const c_void,
    size: usize,
    block: bool,
    user_data: *mut c_void,
) -> c_int

invoke func in the context of the thread or in the caller thread when the loop is not running. May be called from the loop’s thread, but otherwise can only be called by a single thread at a time. If called from the loop’s thread, all callbacks previously queued with pw_data_loop_invoke() will be run synchronously, which might cause unexpected reentrancy problems.

\param[in] loop The loop to invoke func on. \param func The function to be invoked. \param seq A sequence number, opaque to PipeWire. This will be made available to func. \param[in] data Data that will be copied into the internal ring buffer and made available to func. Because this data is copied, it is okay to pass a pointer to a local variable, but do not pass a pointer to an object that has identity. \param size The size of data to copy. \param block If \true, do not return until func has been called. Otherwise, returns immediately. Passing \true does not risk a deadlock because the data thread is never allowed to wait on any other thread. \param user_data An opaque pointer passed to func. \return -EPIPE if the internal ring buffer filled up, if block is \false, 0 is returned when seq is SPA_ID_INVALID or the sequence number with the ASYNC bit set otherwise. When block is \true, the return value of func is returned.

Since 0.3.3