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3.5.3 Group functions

Function: tl_group *tl_create_group (void)
Allocate and initialize group header. Returns NULL when malloc fails.
Function: void tl_free_group (tl_group *group)
Free memory storage used by group structure
Function: int tl_process_group (tl_group *group, int *activated)
Process timers in group and activates their handlers. Returns time until next invocation. Main loop should sleep returned time then. An activated parameter sould be NULL. If it is non NULL, variable is set to number of activated handlers.

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