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Macros | |
#define | LE_CI_LINKAGE |
#define | COMPONENT_INIT LE_CI_LINKAGE LE_SHARED void _le_event_InitializeComponent(void) |
#define | LE_EVENT_INIT_HANDLER COMPONENT_INIT |
Deprecated name for COMPONENT_INIT. | |
Typedefs | |
typedef struct le_event_Id * | le_event_Id_t |
typedef void(* | le_event_HandlerFunc_t) (void *reportPtr) |
typedef void(* | le_event_LayeredHandlerFunc_t) (void *reportPtr, void *secondLayerFunc) |
typedef void(* | le_event_DeferredFunc_t) (void *param1Ptr, void *param2Ptr) |
typedef struct le_event_Handler * | le_event_HandlerRef_t |
Detailed Description
Legato Event Loop API include file.
Copyright (C) Sierra Wireless Inc. Use of this work is subject to license.
Macro Definition Documentation
#define COMPONENT_INIT LE_CI_LINKAGE LE_SHARED void _le_event_InitializeComponent(void) |
Initialization event handler function.
#define LE_CI_LINKAGE |
Typedef Documentation
typedef void(* le_event_DeferredFunc_t) (void *param1Ptr, void *param2Ptr) |
Prototype for deferred functions look like this:
- Parameters
-
param1Ptr [in] Value passed in as param1Ptr to le_event_QueueFunction(). param2Ptr [in] Value passed in as param2Ptr to le_event_QueueFunction().
See Deferred Function Calls for more information.
typedef void(* le_event_HandlerFunc_t) (void *reportPtr) |
Prototype for publish-subscribe event handler functions look like this:
- Parameters
-
reportPtr [in] Pointer to the event report payload.
- Warning
- The reportPtr is only valid until the handler function returns.
typedef struct le_event_Handler* le_event_HandlerRef_t |
Handler reference.
Used to refer to handlers that have been added for events. Only needed if you want to set the handler's context pointer or need to remove the handler later.
typedef struct le_event_Id* le_event_Id_t |
Event ID.
An Event ID ties event reports to event handlers. See Publish-Subscribe Events for more details.
typedef void(* le_event_LayeredHandlerFunc_t) (void *reportPtr, void *secondLayerFunc) |
Prototype for the first layer of a layered publish-subscribe event handler function look like this:
- Parameters
-
reportPtr [in] Pointer to the event report payload. secondLayerFunc [in] Address of the second layer handler function.
- Warning
- The reportPtr is only valid until the handler function returns.
Function Documentation
le_event_HandlerRef_t le_event_AddHandler | ( | const char * | name, |
le_event_Id_t | eventId, | ||
le_event_HandlerFunc_t | handlerFunc | ||
) |
Adds a handler function for a publish-subscribe event ID.
Tells the calling thread event loop to call a specified handler function when a defined event reaches the front of the event queue.
- Returns
- Handler reference, only needed to remove the handler (using le_event_RemoveHandler() ). Can be ignored if the handler will never be removed.
- Note
- Doesn't return on failure, there's no need to check the return value for errors.
- Parameters
-
[in] name Handler name. [in] eventId Event ID. [in] handlerFunc Handler function.
le_event_HandlerRef_t le_event_AddLayeredHandler | ( | const char * | name, |
le_event_Id_t | eventId, | ||
le_event_LayeredHandlerFunc_t | firstLayerFunc, | ||
void * | secondLayerFunc | ||
) |
Adds a layered handler function for a publish-subscribe event ID.
Tells the calling thread event loop to call a specified handler function when a defined event reaches the front of the event queue. Passes the required handler functions when called.
This is intended for use in implementing Layered Publish-Subscribe Handlers.
- Returns
- Handler reference, only needed for later removal of the handler (using le_event_RemoveHandler() ). Can be ignored if the handler will never be removed.
- Note
- Doesn't return on failure, there's no need to check the return value for errors.
- Parameters
-
[in] name Handler name. [in] eventId Event ID. [in] firstLayerFunc Pointer to first-layer handler func. [in] secondLayerFunc Pointer to second-layer handler func.
le_event_Id_t le_event_CreateId | ( | const char * | name, |
size_t | payloadSize | ||
) |
Create a new event ID.
- Returns
- Event ID.
- Note
- Doesn't return on failure, there's no need to check the return value for errors.
- Parameters
-
[in] name Name of the event ID. (Named for diagnostic purposes.) [in] payloadSize Data payload size (in bytes) of the event reports (can be 0).
le_event_Id_t le_event_CreateIdWithRefCounting | ( | const char * | name | ) |
Create a new event ID to report events where the payload is a pointer to a reference-counted memory pool object allocated using the Dynamic Memory Allocation API.
- Returns
- Event ID.
- Note
- Doesn't return on failure, there's no need to check the return value for errors.
- Parameters
-
[in] name Name of the event ID. (Named for diagnostic purposes.)
void* le_event_GetContextPtr | ( | void | ) |
Fetches the context pointer for the currently running event handler.
Can only be called from within an event handler function.
- Returns
- Context pointer that was set using le_event_SetContextPtr(), or NULL if le_event_SetContextPtr() was not called.
int le_event_GetFd | ( | void | ) |
Fetches a file descriptor that will appear readable to poll(), select(), epoll_wait(), etc. when the calling thread's Event Loop needs servicing (via a call to le_event_ServiceLoop()).
- Warning
- Only intended for use when integrating with legacy POSIX-based software that cannot be easily refactored to use the Legato Event Loop. The preferred approach is to call le_event_RunLoop().
- Returns
- The file descriptor.
void le_event_QueueFunction | ( | le_event_DeferredFunc_t | func, |
void * | param1Ptr, | ||
void * | param2Ptr | ||
) |
Queue a function onto the calling thread's Event Queue. When it reaches the head of the Event Queue, it will be called by the calling thread's Event Loop.
- Parameters
-
[in] func Function to be called later. [in] param1Ptr Value to be passed to the function when called. [in] param2Ptr Value to be passed to the function when called.
void le_event_QueueFunctionToThread | ( | le_thread_Ref_t | thread, |
le_event_DeferredFunc_t | func, | ||
void * | param1Ptr, | ||
void * | param2Ptr | ||
) |
Queue a function onto a specific thread's Event Queue. When it reaches the head of that Event Queue, it will be called by that thread's Event Loop.
- Parameters
-
[in] thread Thread to queue the function to. [in] func The function. [in] param1Ptr Value to be passed to the function when called. [in] param2Ptr Value to be passed to the function when called.
void le_event_RemoveHandler | ( | le_event_HandlerRef_t | handlerRef | ) |
Remove Handler
Removes a previously added event handler function.
- Parameters
-
[in] handlerRef Handler reference.
void le_event_Report | ( | le_event_Id_t | eventId, |
void * | payloadPtr, | ||
size_t | payloadSize | ||
) |
Report an Event
Queues an Event Report to any and all event loops that have handlers for that event.
- Note
- Copies the event report payload, so it is safe to release or reuse the buffer that payloadPtr points to as soon as le_event_Report() returns.
- Parameters
-
[in] eventId Event ID created using le_event_CreateId(). [in] payloadPtr Pointer to the payload bytes to be copied into the report. [in] payloadSize Number of bytes of payload to copy into the report.
void le_event_ReportWithRefCounting | ( | le_event_Id_t | eventId, |
void * | objectPtr | ||
) |
Sends an Event Report with a pointer to a reference-counted object as its payload. The pointer must have been obtained from a memory pool using the Dynamic Memory Allocation API.
Calling this function passes ownership of the reference to the Event Loop API. The Event Loop API will ensure that the reference is properly counted while it passes through the event report dispatching system. Each handler will receive one counted reference to the object, so the handler is responsible for releasing the object when it is finished with it.
- Parameters
-
[in] eventId Event ID created using le_event_CreateIdWithRefCounting(). [in] objectPtr Pointer to an object allocated from a memory pool (using the Dynamic Memory Allocation API).
void le_event_RunLoop | ( | void | ) |
Runs the event loop for the calling thread.
This starts processing events by the calling thread.
Can only be called once for each thread, and must never be called in the process's main thread.
- Note
- Function never returns.
le_result_t le_event_ServiceLoop | ( | void | ) |
Services the calling thread's Event Loop.
- Warning
- Only intended for use when integrating with legacy POSIX-based software that can't be easily refactored to use the Legato Event Loop. The preferred approach is to call le_event_RunLoop().
See also: le_event_GetFd().
- Returns
- LE_OK if there is more to be done. DO NOT GO BACK TO SLEEP without calling le_event_ServiceLoop() again.
- LE_WOULD_BLOCK if there is nothing left to do for now and it is safe to go back to sleep.
void le_event_SetContextPtr | ( | le_event_HandlerRef_t | handlerRef, |
void * | contextPtr | ||
) |
Sets the context pointer for a given event handler.
This can later be retrieved using le_event_GetContextPtr() from within the handler function when it is called.
- Parameters
-
[in] handlerRef Handler where context pointer is to be set. [in] contextPtr Context pointer value.