+++ /dev/null
-/*
- * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
- * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef _EVENT_INTERNAL_H_
-#define _EVENT_INTERNAL_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "event2/event-config.h"
-#include <time.h>
-#include <sys/queue.h>
-#include "event2/event_struct.h"
-#include "minheap-internal.h"
-#include "evsignal-internal.h"
-#include "mm-internal.h"
-#include "defer-internal.h"
-
-/* map union members back */
-
-/* mutually exclusive */
-#define ev_signal_next _ev.ev_signal.ev_signal_next
-#define ev_io_next _ev.ev_io.ev_io_next
-#define ev_io_timeout _ev.ev_io.ev_timeout
-
-/* used only by signals */
-#define ev_ncalls _ev.ev_signal.ev_ncalls
-#define ev_pncalls _ev.ev_signal.ev_pncalls
-
-/* Possible values for ev_closure in struct event. */
-#define EV_CLOSURE_NONE 0
-#define EV_CLOSURE_SIGNAL 1
-#define EV_CLOSURE_PERSIST 2
-
-/** Structure to define the backend of a given event_base. */
-struct eventop {
- /** The name of this backend. */
- const char *name;
- /** Function to set up an event_base to use this backend. It should
- * create a new structure holding whatever information is needed to
- * run the backend, and return it. The returned pointer will get
- * stored by event_init into the event_base.evbase field. On failure,
- * this function should return NULL. */
- void *(*init)(struct event_base *);
- /** Enable reading/writing on a given fd or signal. 'events' will be
- * the events that we're trying to enable: one or more of EV_READ,
- * EV_WRITE, EV_SIGNAL, and EV_ET. 'old' will be those events that
- * were enabled on this fd previously. 'fdinfo' will be a structure
- * associated with the fd by the evmap; its size is defined by the
- * fdinfo field below. It will be set to 0 the first time the fd is
- * added. The function should return 0 on success and -1 on error.
- */
- int (*add)(struct event_base *, evutil_socket_t fd, short old, short events, void *fdinfo);
- /** As "add", except 'events' contains the events we mean to disable. */
- int (*del)(struct event_base *, evutil_socket_t fd, short old, short events, void *fdinfo);
- /** Function to implement the core of an event loop. It must see which
- added events are ready, and cause event_active to be called for each
- active event (usually via event_io_active or such). It should
- return 0 on success and -1 on error.
- */
- int (*dispatch)(struct event_base *, struct timeval *);
- /** Function to clean up and free our data from the event_base. */
- void (*dealloc)(struct event_base *);
- /** Flag: set if we need to reinitialize the event base after we fork.
- */
- int need_reinit;
- /** Bit-array of supported event_method_features that this backend can
- * provide. */
- enum event_method_feature features;
- /** Length of the extra information we should record for each fd that
- has one or more active events. This information is recorded
- as part of the evmap entry for each fd, and passed as an argument
- to the add and del functions above.
- */
- size_t fdinfo_len;
-};
-
-#ifdef WIN32
-/* If we're on win32, then file descriptors are not nice low densely packed
- integers. Instead, they are pointer-like windows handles, and we want to
- use a hashtable instead of an array to map fds to events.
-*/
-#define EVMAP_USE_HT
-#endif
-
-/* #define HT_CACHE_HASH_VALS */
-
-#ifdef EVMAP_USE_HT
-#include "ht-internal.h"
-struct event_map_entry;
-HT_HEAD(event_io_map, event_map_entry);
-#else
-#define event_io_map event_signal_map
-#endif
-
-/* Used to map signal numbers to a list of events. If EVMAP_USE_HT is not
- defined, this structure is also used as event_io_map, which maps fds to a
- list of events.
-*/
-struct event_signal_map {
- /* An array of evmap_io * or of evmap_signal *; empty entries are
- * set to NULL. */
- void **entries;
- /* The number of entries available in entries */
- int nentries;
-};
-
-/* A list of events waiting on a given 'common' timeout value. Ordinarily,
- * events waiting for a timeout wait on a minheap. Sometimes, however, a
- * queue can be faster.
- **/
-struct common_timeout_list {
- /* List of events currently waiting in the queue. */
- struct event_list events;
- /* 'magic' timeval used to indicate the duration of events in this
- * queue. */
- struct timeval duration;
- /* Event that triggers whenever one of the events in the queue is
- * ready to activate */
- struct event timeout_event;
- /* The event_base that this timeout list is part of */
- struct event_base *base;
-};
-
-struct event_change;
-
-/* List of 'changes' since the last call to eventop.dispatch. Only maintained
- * if the backend is using changesets. */
-struct event_changelist {
- struct event_change *changes;
- int n_changes;
- int changes_size;
-};
-
-#ifndef _EVENT_DISABLE_DEBUG_MODE
-/* Global internal flag: set to one if debug mode is on. */
-extern int _event_debug_mode_on;
-#define EVENT_DEBUG_MODE_IS_ON() (_event_debug_mode_on)
-#else
-#define EVENT_DEBUG_MODE_IS_ON() (0)
-#endif
-
-struct event_base {
- /** Function pointers and other data to describe this event_base's
- * backend. */
- const struct eventop *evsel;
- /** Pointer to backend-specific data. */
- void *evbase;
-
- /** List of changes to tell backend about at next dispatch. Only used
- * by the O(1) backends. */
- struct event_changelist changelist;
-
- /** Function pointers used to describe the backend that this event_base
- * uses for signals */
- const struct eventop *evsigsel;
- /** Data to implement the common signal handelr code. */
- struct evsig_info sig;
-
- /** Number of virtual events */
- int virtual_event_count;
- /** Number of total events added to this event_base */
- int event_count;
- /** Number of total events active in this event_base */
- int event_count_active;
-
- /** Set if we should terminate the loop once we're done processing
- * events. */
- int event_gotterm;
- /** Set if we should terminate the loop immediately */
- int event_break;
-
- /** Set if we're running the event_base_loop function, to prevent
- * reentrant invocation. */
- int running_loop;
-
- /* Active event management. */
- /** An array of nactivequeues queues for active events (ones that
- * have triggered, and whose callbacks need to be called). Low
- * priority numbers are more important, and stall higher ones.
- */
- struct event_list *activequeues;
- /** The length of the activequeues array */
- int nactivequeues;
-
- /* common timeout logic */
-
- /** An array of common_timeout_list* for all of the common timeout
- * values we know. */
- struct common_timeout_list **common_timeout_queues;
- /** The number of entries used in common_timeout_queues */
- int n_common_timeouts;
- /** The total size of common_timeout_queues. */
- int n_common_timeouts_allocated;
-
- /** List of defered_cb that are active. We run these after the active
- * events. */
- struct deferred_cb_queue defer_queue;
-
- /** Mapping from file descriptors to enabled (added) events */
- struct event_io_map io;
-
- /** Mapping from signal numbers to enabled (added) events. */
- struct event_signal_map sigmap;
-
- /** All events that have been enabled (added) in this event_base */
- struct event_list eventqueue;
-
- /** Stored timeval; used to detect when time is running backwards. */
- struct timeval event_tv;
-
- /** Priority queue of events with timeouts. */
- struct min_heap timeheap;
-
- /** Stored timeval: used to avoid calling gettimeofday/clock_gettime
- * too often. */
- struct timeval tv_cache;
-
-#if defined(_EVENT_HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
- /** Difference between internal time (maybe from clock_gettime) and
- * gettimeofday. */
- struct timeval tv_clock_diff;
- /** Second in which we last updated tv_clock_diff, in monotonic time. */
- time_t last_updated_clock_diff;
-#endif
-
-#ifndef _EVENT_DISABLE_THREAD_SUPPORT
- /* threading support */
- /** The thread currently running the event_loop for this base */
- unsigned long th_owner_id;
- /** A lock to prevent conflicting accesses to this event_base */
- void *th_base_lock;
- /** The event whose callback is executing right now */
- struct event *current_event;
- /** A condition that gets signalled when we're done processing an
- * event with waiters on it. */
- void *current_event_cond;
- /** Number of threads blocking on current_event_cond. */
- int current_event_waiters;
-#endif
-
-#ifdef WIN32
- /** IOCP support structure, if IOCP is enabled. */
- struct event_iocp_port *iocp;
-#endif
-
- /** Flags that this base was configured with */
- enum event_base_config_flag flags;
-
- /* Notify main thread to wake up break, etc. */
- /** True if the base already has a pending notify, and we don't need
- * to add any more. */
- int is_notify_pending;
- /** A socketpair used by some th_notify functions to wake up the main
- * thread. */
- evutil_socket_t th_notify_fd[2];
- /** An event used by some th_notify functions to wake up the main
- * thread. */
- struct event th_notify;
- /** A function used to wake up the main thread from another thread. */
- int (*th_notify_fn)(struct event_base *base);
-};
-
-struct event_config_entry {
- TAILQ_ENTRY(event_config_entry) next;
-
- const char *avoid_method;
-};
-
-/** Internal structure: describes the configuration we want for an event_base
- * that we're about to allocate. */
-struct event_config {
- TAILQ_HEAD(event_configq, event_config_entry) entries;
-
- int n_cpus_hint;
- enum event_method_feature require_features;
- enum event_base_config_flag flags;
-};
-
-/* Internal use only: Functions that might be missing from <sys/queue.h> */
-#if defined(_EVENT_HAVE_SYS_QUEUE_H) && !defined(_EVENT_HAVE_TAILQFOREACH)
-#ifndef TAILQ_FIRST
-#define TAILQ_FIRST(head) ((head)->tqh_first)
-#endif
-#ifndef TAILQ_END
-#define TAILQ_END(head) NULL
-#endif
-#ifndef TAILQ_NEXT
-#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
-#endif
-
-#define TAILQ_FOREACH(var, head, field) \
- for ((var) = TAILQ_FIRST(head); \
- (var) != TAILQ_END(head); \
- (var) = TAILQ_NEXT(var, field))
-
-#ifndef TAILQ_INSERT_BEFORE
-#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
- (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
- (elm)->field.tqe_next = (listelm); \
- *(listelm)->field.tqe_prev = (elm); \
- (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
-} while (0)
-#endif
-#endif /* TAILQ_FOREACH */
-
-#define N_ACTIVE_CALLBACKS(base) \
- ((base)->event_count_active + (base)->defer_queue.active_count)
-
-int _evsig_set_handler(struct event_base *base, int evsignal,
- void (*fn)(int));
-int _evsig_restore_handler(struct event_base *base, int evsignal);
-
-void event_active_nolock(struct event *ev, int res, short count);
-
-/* FIXME document. */
-void event_base_add_virtual(struct event_base *base);
-void event_base_del_virtual(struct event_base *base);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _EVENT_INTERNAL_H_ */
-
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