/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_EVENT_H #define ISC_EVENT_H 1 /*! \file isc/event.h */ #include <isc/lang.h> #include <isc/types.h> /***** ***** Events. *****/ typedef void (*isc_eventdestructor_t)(isc_event_t *); #define ISC_EVENT_COMMON(ltype) \ size_t ev_size; \ unsigned int ev_attributes; \ void *ev_tag; \ isc_eventtype_t ev_type; \ isc_taskaction_t ev_action; \ void *ev_arg; \ void *ev_sender; \ isc_eventdestructor_t ev_destroy; \ void *ev_destroy_arg; \ ISC_LINK(ltype) ev_link; \ ISC_LINK(ltype) ev_ratelink /*% * Attributes matching a mask of 0x000000ff are reserved for the task library's * definition. Attributes of 0xffffff00 may be used by the application * or non-ISC libraries. */ #define ISC_EVENTATTR_NOPURGE 0x00000001 /*% * The ISC_EVENTATTR_CANCELED attribute is intended to indicate * that an event is delivered as a result of a canceled operation * rather than successful completion, by mutual agreement * between the sender and receiver. It is not set or used by * the task system. */ #define ISC_EVENTATTR_CANCELED 0x00000002 #define ISC_EVENT_INIT(event, sz, at, ta, ty, ac, ar, sn, df, da) \ do { \ (event)->ev_size = (sz); \ (event)->ev_attributes = (at); \ (event)->ev_tag = (ta); \ (event)->ev_type = (ty); \ (event)->ev_action = (ac); \ (event)->ev_arg = (ar); \ (event)->ev_sender = (sn); \ (event)->ev_destroy = (df); \ (event)->ev_destroy_arg = (da); \ ISC_LINK_INIT((event), ev_link); \ ISC_LINK_INIT((event), ev_ratelink); \ } while (0) /*% * This structure is public because "subclassing" it may be useful when * defining new event types. */ struct isc_event { ISC_EVENT_COMMON(struct isc_event); }; #define ISC_EVENTTYPE_FIRSTEVENT 0x00000000 #define ISC_EVENTTYPE_LASTEVENT 0xffffffff #define ISC_EVENT_PTR(p) ((isc_event_t **)(void *)(p)) ISC_LANG_BEGINDECLS isc_event_t * isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type, isc_taskaction_t action, void *arg, size_t size); isc_event_t * isc_event_constallocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type, isc_taskaction_t action, const void *arg, size_t size); /*%< * Allocate an event structure. * * Allocate and initialize in a structure with initial elements * defined by: * * \code * struct { * ISC_EVENT_COMMON(struct isc_event); * ... * }; * \endcode * * Requires: *\li 'size' >= sizeof(struct isc_event) *\li 'action' to be non NULL * * Returns: *\li a pointer to a initialized structure of the requested size. *\li NULL if unable to allocate memory. */ void isc_event_free(isc_event_t **); ISC_LANG_ENDDECLS #endif /* ISC_EVENT_H */