IPDL

include protocol PBrowser;

namespace mozilla {
namespace dom {

/**
 * PDemo - a demonstration IPDL protocol showing async and sync messaging
 * between parent and child processes in Firefox's multi-process architecture.
 */
async protocol PDemo {
  manager PBrowser;

parent:
  /**
   * Send a string message from child to parent asynchronously.
   */
  async SendMessage(nsString aMessage);

  /**
   * Request a computation result synchronously.
   */
  sync ComputeResult(uint32_t aInput) returns (uint32_t aResult);

child:
  /**
   * Notify the child of an event from the parent.
   */
  async NotifyEvent(uint32_t aEventType, nsString aPayload);

  /**
   * Tell the child to update its state.
   */
  async UpdateState(bool aEnabled);

both:
  /**
   * Protocol teardown - called by either side.
   */
  async __delete__();
};

} // namespace dom
} // namespace mozilla