# message.h ## **Overview** **Related Modules:** [Samgr](samgr.md) **Description:** Provides message communication APIs that help you to implement asynchronous functions of [IUnknown](iunknown.md). This API is used to implement asynchronous functions of [IUnknown](iunknown.md). **Since:** 1.0 **Version:** 1.0 ## **Summary** ## Data Structures
SAMGR_SendRequest (const Identity *identity, const Request *request, Handler handler) |
Sends a request to a service or feature of a specified identity. |
SAMGR_SendSharedRequest (const Identity *identity, const Request *request, uint32 *token, Handler handler) |
Sends a request to multiple services or features to save memory. |
SAMGR_SendSharedDirectRequest (const Identity *id, const Request *req, const Response *resp, uint32 **ref, Handler handler) |
Sends a request and response of a caller to the feature thread. The handler is directly called to process the request and response without using the message processing functions. (Customized function for the broadcast service) |
SAMGR_SendResponse (const Request *request, const Response *response) |
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SAMGR_SendResponseByIdentity (const Identity *id, const Request *request, const Response *response) |
Sends a response to a specified service or feature after processing the original request. (Customized function for bootstrap) |