标签：函数 bec 种类 man 文件 libev 通过 windows timer
struct event { TAILQ_ENTRY(event) ev_active_next; TAILQ_ENTRY(event) ev_next; /* for managing timeouts */ union { TAILQ_ENTRY(event) ev_next_with_common_timeout; int min_heap_idx; } ev_timeout_pos; evutil_socket_t ev_fd; struct event_base *ev_base; union { // I/O事件和信号事件不能同时设置 /* used for io events */ struct { TAILQ_ENTRY(event) ev_io_next; struct timeval ev_timeout; } ev_io; /* used by signal events */ struct { TAILQ_ENTRY(event) ev_signal_next; short ev_ncalls; /* Allows deletes in callback */ short *ev_pncalls; } ev_signal; } _ev; short ev_events; short ev_res; /* result passed to event callback */ short ev_flags; ev_uint8_t ev_pri; /* smaller numbers are higher priority */ ev_uint8_t ev_closure; struct timeval ev_timeout; /* allows us to adopt for different types of events */ void (*ev_callback)(evutil_socket_t, short, void *arg); void *ev_arg; };
源文档解释
/** * @struct event * * Structure to represent a single event. * * An event can have some underlying condition it represents: a socket * becoming readable or writeable (or both), or a signal becoming raised. * (An event that represents no underlying condition is still useful: you * can use one to implement a timer, or to communicate between threads.) * * Generally, you can create events with event_new(), then make them * pending with event_add(). As your event_base runs, it will run the * callbacks of an events whose conditions are triggered. When you * longer want the event, free it with event_free(). * * In more depth: * * An event may be "pending" (one whose condition we are watching), * "active" (one whose condition has triggered and whose callback is about * to run), neither, or both. Events come into existence via * event_assign() or event_new(), and are then neither active nor pending. * * To make an event pending, pass it to event_add(). When doing so, you * can also set a timeout for the event. * * Events become active during an event_base_loop() call when either their * condition has triggered, or when their timeout has elapsed. You can * also activate an event manually using event_active(). The even_base * loop will run the callbacks of active events; after it has done so, it * marks them as no longer active. * * You can make an event non-pending by passing it to event_del(). This * also makes the event non-active. * * Events can be "persistent" or "non-persistent". A non-persistent event * becomes non-pending as soon as it is triggered: thus, it only runs at * most once per call to event_add(). A persistent event remains pending * even when it becomes active: you‘ll need to event_del() it manually in * order to make it non-pending. When a persistent event with a timeout * becomes active, its timeout is reset: this means you can use persistent * events to implement periodic timeouts. * * This should be treated as an opaque structure; you should never read or * write any of its fields directly. For backward compatibility with old * code, it is defined in the event2/event_struct.h header; including this * header may make your code incompatible with other versions of Libevent. * * @see event_new(), event_free(), event_assign(), event_get_assignment(), * event_add(), event_del(), event_active(), event_pending(), * event_get_fd(), event_get_base(), event_get_events(), * event_get_callback(), event_get_callback_arg(), * event_priority_set() */
标签：函数 bec 种类 man 文件 libev 通过 windows timer
原文地址：https://www.cnblogs.com/tianzeng/p/10799362.html
