--- libev/ev.h 2007/11/03 09:19:58 1.24 +++ libev/ev.h 2007/11/24 06:23:27 1.65 @@ -27,8 +27,8 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ -#ifndef EV_H -#define EV_H +#ifndef EV_H__ +#define EV_H__ #ifdef __cplusplus extern "C" { @@ -44,23 +44,50 @@ # define EV_MAXPRI +2 #endif +#ifndef EV_MULTIPLICITY +# define EV_MULTIPLICITY 1 +#endif + +#ifndef EV_PERIODICS +# define EV_PERIODICS 1 +#endif + +/* support multiple event loops? */ +#if EV_MULTIPLICITY +struct ev_loop; +# define EV_P struct ev_loop *loop +# define EV_P_ EV_P, +# define EV_A loop +# define EV_A_ EV_A, +# define EV_DEFAULT_A ev_default_loop (0) +# define EV_DEFAULT_A_ EV_DEFAULT_A, +#else +# define EV_P void +# define EV_P_ +# define EV_A +# define EV_A_ +# define EV_DEFAULT_A +# define EV_DEFAULT_A_ +#endif + /* eventmask, revents, events... */ -#define EV_UNDEF -1 /* guaranteed to be invalid */ -#define EV_NONE 0x00 -#define EV_READ 0x01 -#define EV_WRITE 0x02 -#define EV_TIMEOUT 0x000100 -#define EV_PERIODIC 0x000200 -#define EV_SIGNAL 0x000400 -#define EV_IDLE 0x000800 -#define EV_CHECK 0x001000 -#define EV_PREPARE 0x002000 -#define EV_CHILD 0x004000 -#define EV_ERROR 0x800000 /* sent when an error occurs */ +#define EV_UNDEF -1L /* guaranteed to be invalid */ +#define EV_NONE 0x00L +#define EV_READ 0x01L /* io only */ +#define EV_WRITE 0x02L /* io only */ +#define EV_TIMEOUT 0x000100L /* timer only */ +#define EV_PERIODIC 0x000200L /* periodic timer only */ +#define EV_SIGNAL 0x000400L /* signal only */ +#define EV_IDLE 0x000800L /* idle only */ +#define EV_CHECK 0x001000L /* check only */ +#define EV_PREPARE 0x002000L /* prepare only */ +#define EV_CHILD 0x004000L /* child/pid only */ +#define EV_EMBED 0x008000L /* embedded event loop */ +#define EV_ERROR 0x800000L /* sent when an error occurs */ -/* can be used to add custom fields to all watchers */ +/* can be used to add custom fields to all watchers, while losing binary compatibility */ #ifndef EV_COMMON -# define EV_COMMON void *data +# define EV_COMMON void *data; #endif #ifndef EV_PROTOTYPES # define EV_PROTOTYPES 1 @@ -69,6 +96,13 @@ #define EV_VERSION_MAJOR 1 #define EV_VERSION_MINOR 1 +#ifndef EV_CB_DECLARE +# define EV_CB_DECLARE(type) void (*cb)(EV_P_ struct type *w, int revents); +#endif +#ifndef EV_CB_INVOKE +# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents)) +#endif + /* * struct member types: * private: you can look at them, but not change them, and they might not mean anything to you. @@ -80,38 +114,41 @@ #define EV_WATCHER(type) \ int active; /* private */ \ int pending; /* private */ \ - int priority; /* ro */ \ - EV_COMMON; /* rw */ \ - void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ + int priority; /* private */ \ + EV_COMMON /* rw */ \ + EV_CB_DECLARE (type) /* private */ #define EV_WATCHER_LIST(type) \ - EV_WATCHER (type); \ - struct type *next /* private */ + EV_WATCHER (type) \ + struct ev_watcher_list *next; /* private */ #define EV_WATCHER_TIME(type) \ - EV_WATCHER (type); \ - ev_tstamp at /* private */ + EV_WATCHER (type) \ + ev_tstamp at; /* private */ /* base class, nothing to see here unless you subclass */ -struct ev_watcher { - EV_WATCHER (ev_watcher); +struct ev_watcher +{ + EV_WATCHER (ev_watcher) }; /* base class, nothing to see here unless you subclass */ -struct ev_watcher_list { - EV_WATCHER_LIST (ev_watcher_list); +struct ev_watcher_list +{ + EV_WATCHER_LIST (ev_watcher_list) }; /* base class, nothing to see here unless you subclass */ -struct ev_watcher_time { - EV_WATCHER_TIME (ev_watcher_time); +struct ev_watcher_time +{ + EV_WATCHER_TIME (ev_watcher_time) }; /* invoked after a specific time, repeatable (based on monotonic clock) */ /* revent EV_TIMEOUT */ struct ev_timer { - EV_WATCHER_TIME (ev_timer); + EV_WATCHER_TIME (ev_timer) ev_tstamp repeat; /* rw */ }; @@ -120,16 +157,17 @@ /* revent EV_PERIODIC */ struct ev_periodic { - EV_WATCHER_TIME (ev_periodic); + EV_WATCHER_TIME (ev_periodic) ev_tstamp interval; /* rw */ + ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* rw */ }; /* invoked when fd is either EV_READable or EV_WRITEable */ /* revent EV_READ, EV_WRITE */ struct ev_io { - EV_WATCHER_LIST (ev_io); + EV_WATCHER_LIST (ev_io) int fd; /* ro */ int events; /* ro */ @@ -139,7 +177,7 @@ /* revent EV_SIGNAL */ struct ev_signal { - EV_WATCHER_LIST (ev_signal); + EV_WATCHER_LIST (ev_signal) int signum; /* ro */ }; @@ -148,7 +186,7 @@ /* revent EV_IDLE */ struct ev_idle { - EV_WATCHER (ev_idle); + EV_WATCHER (ev_idle) }; /* invoked for each run of the mainloop, just before the blocking call */ @@ -156,113 +194,249 @@ /* revent EV_PREPARE */ struct ev_prepare { - EV_WATCHER (ev_prepare); + EV_WATCHER (ev_prepare) }; /* invoked for each run of the mainloop, just after the blocking call */ /* revent EV_CHECK */ struct ev_check { - EV_WATCHER (ev_check); + EV_WATCHER (ev_check) }; -/* invoked when sigchld is received and waitpid indicates the givne pid */ +/* invoked when sigchld is received and waitpid indicates the given pid */ /* revent EV_CHILD */ +/* does not support priorities */ struct ev_child { - EV_WATCHER_LIST (ev_child); + EV_WATCHER_LIST (ev_child) int pid; /* ro */ int rpid; /* rw, holds the received pid */ int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */ }; -#define EVMETHOD_AUTO 0 /* consults environment */ -#define EVMETHOD_SELECT 1 -#define EVMETHOD_POLL 2 -#define EVMETHOD_EPOLL 4 -#define EVMETHOD_KQUEUE 8 -#define EVMETHOD_DEVPOLL 16 /* NYI */ -#define EVMETHOD_PORT 32 /* NYI */ -#define EVMETHOD_ANY ~0 /* any method, do not consult env */ +#if EV_MULTIPLICITY +/* used to embed an event loop inside another */ +/* the callback gets invoked when the event loop has handled events, and can be 0 */ +struct ev_embed +{ + EV_WATCHER (ev_embed) + + struct ev_io io; /* private */ + struct ev_loop *loop; /* ro */ +}; +#endif + +/* the presence of this union forces similar struct layout */ +union ev_any_watcher +{ + struct ev_watcher w; + struct ev_watcher_list wl; + + struct ev_io io; + struct ev_timer timer; + struct ev_periodic periodic; + struct ev_idle idle; + struct ev_prepare prepare; + struct ev_check check; + struct ev_signal signal; + struct ev_child child; + struct ev_embed embed; +}; + +/* bits for ev_default_loop and ev_loop_new */ +/* the default */ +#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */ +/* flag bits */ +#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */ +/* method bits to be ored together */ +#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */ +#define EVBACKEND_POLL 0x00000002UL /* !win */ +#define EVBACKEND_EPOLL 0x00000004UL /* linux */ +#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */ +#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 */ /* NYI */ +#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */ + #if EV_PROTOTYPES -extern int ev_method; -int ev_init (int methods); /* returns ev_method */ int ev_version_major (void); int ev_version_minor (void); -/* these three calls are suitable for plugging into pthread_atfork */ -void ev_fork_prepare (void); -void ev_fork_parent (void); -void ev_fork_child (void); +unsigned int ev_supported_backends (void); +unsigned int ev_recommended_backends (void); +unsigned int ev_embeddable_backends (void); -extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ ev_tstamp ev_time (void); + +/* Sets the allocation function to use, works like realloc. + * It is used to allocate and free memory. + * If it returns zero when memory needs to be allocated, the library might abort + * or take some potentially destructive action. + * The default is your system realloc function. + */ +void ev_set_allocator (void *(*cb)(void *ptr, long size)); + +/* set the callback function to call on a + * retryable syscall error + * (such as failed select, poll, epoll_wait) + */ +void ev_set_syserr_cb (void (*cb)(const char *msg)); + +# if EV_MULTIPLICITY +/* the default loop is the only one that handles signals and child watchers */ +/* you can call this as often as you like */ +static struct ev_loop * +ev_default_loop (unsigned int flags) +{ + extern struct ev_loop *ev_default_loop_ptr; + extern struct ev_loop *ev_default_loop_init (unsigned int flags); + + if (!ev_default_loop_ptr) + ev_default_loop_init (flags); + + return ev_default_loop_ptr; +} + +/* create and destroy alternative loops that don't handle signals */ +struct ev_loop *ev_loop_new (unsigned int flags); +void ev_loop_destroy (EV_P); +void ev_loop_fork (EV_P); + +ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */ + +# else + +int ev_default_loop (unsigned int flags); /* returns true when successful */ + +static ev_tstamp +ev_now (void) +{ + extern ev_tstamp ev_rt_now; + + return ev_rt_now; +} +# endif + +void ev_default_destroy (void); /* destroy the default loop */ +/* this needs to be called after fork, to duplicate the default loop */ +/* if you create alternative loops you have to call ev_loop_fork on them */ +/* you can call it in either the parent or the child */ +/* you can actually call it at any time, anywhere :) */ +void ev_default_fork (void); + +unsigned int ev_backend (EV_P); #endif #define EVLOOP_NONBLOCK 1 /* do not block/wait */ #define EVLOOP_ONESHOT 2 /* block *once* only */ +#define EVUNLOOP_CANCEL 0 /* undo unloop */ +#define EVUNLOOP_ONE 1 /* unloop once */ +#define EVUNLOOP_ALL 2 /* unloop all loops */ + #if EV_PROTOTYPES -void ev_loop (int flags); -extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ +void ev_loop (EV_P_ int flags); +void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ + +/* + * ref/unref can be used to add or remove a refcount on the mainloop. every watcher + * keeps one reference. if you have a long-runing watcher you never unregister that + * should not keep ev_loop from running, unref() after starting, and ref() before stopping. + */ +void ev_ref (EV_P); +void ev_unref (EV_P); /* convinience function, wait for a single event, without registering an event watcher */ /* if timeout is < 0, do wait indefinitely */ -void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg); +void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg); #endif /* these may evaluate ev multiple times, and the other arguments at most once */ -/* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */ -#define ev_watcher_init(ev,cb_) do { (ev)->active = (ev)->pending = (ev)->priority = 0; (ev)->cb = (cb_); } while (0) +/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */ +#define ev_init(ev,cb_) do { \ + ((struct ev_watcher *)(void *)(ev))->active = \ + ((struct ev_watcher *)(void *)(ev))->pending = \ + ((struct ev_watcher *)(void *)(ev))->priority = 0; \ + ev_set_cb ((ev), cb_); \ +} while (0) #define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) #define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) -#define ev_periodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) +#define ev_periodic_set(ev,at_,ival_,res_) do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0) #define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) #define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */ #define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */ #define ev_check_set(ev) /* nop, yes, this is a serious in-joke */ #define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0) +#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0) -#define ev_io_init(ev,cb,fd,events) do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0) -#define ev_timer_init(ev,cb,after,repeat) do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0) -#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0) -#define ev_signal_init(ev,cb,signum) do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0) -#define ev_idle_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0) -#define ev_prepare_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0) -#define ev_check_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0) -#define ev_child_init(ev,cb,pid) do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0) +#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0) +#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0) +#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0) +#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0) +#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0) +#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0) +#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0) +#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0) +#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0) + +#define ev_is_pending(ev) (0 + ((struct ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */ +#define ev_is_active(ev) (0 + ((struct ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */ + +#define ev_priority(ev) ((struct ev_watcher *)(void *)(ev))->priority /* rw */ +#define ev_cb(ev) (ev)->cb /* rw */ +#define ev_set_priority(ev,pri) ev_priority (ev) = (pri) -#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ -#define ev_set_priority(ev,pri) (ev)->priority = pri +#ifndef ev_set_cb +# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_) +#endif /* stopping (enabling, adding) a watcher does nothing if it is already running */ /* stopping (disabling, deleting) a watcher does nothing unless its already running */ #if EV_PROTOTYPES -void ev_io_start (struct ev_io *w); -void ev_io_stop (struct ev_io *w); -void ev_timer_start (struct ev_timer *w); -void ev_timer_stop (struct ev_timer *w); -void ev_timer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ - -void ev_periodic_start (struct ev_periodic *w); -void ev_periodic_stop (struct ev_periodic *w); +/* feeds an event into a watcher as if the event actually occured */ +/* accepts any ev_watcher type */ +void ev_feed_event (EV_P_ void *w, int revents); +void ev_feed_fd_event (EV_P_ int fd, int revents); +void ev_feed_signal_event (EV_P_ int signum); + +void ev_io_start (EV_P_ struct ev_io *w); +void ev_io_stop (EV_P_ struct ev_io *w); + +void ev_timer_start (EV_P_ struct ev_timer *w); +void ev_timer_stop (EV_P_ struct ev_timer *w); +/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ +void ev_timer_again (EV_P_ struct ev_timer *w); + +#if EV_PERIODICS +void ev_periodic_start (EV_P_ struct ev_periodic *w); +void ev_periodic_stop (EV_P_ struct ev_periodic *w); +void ev_periodic_again (EV_P_ struct ev_periodic *w); +#endif -void ev_signal_start (struct ev_signal *w); -void ev_signal_stop (struct ev_signal *w); +void ev_idle_start (EV_P_ struct ev_idle *w); +void ev_idle_stop (EV_P_ struct ev_idle *w); -void ev_idle_start (struct ev_idle *w); -void ev_idle_stop (struct ev_idle *w); +void ev_prepare_start (EV_P_ struct ev_prepare *w); +void ev_prepare_stop (EV_P_ struct ev_prepare *w); -void ev_prepare_start (struct ev_prepare *w); -void ev_prepare_stop (struct ev_prepare *w); +void ev_check_start (EV_P_ struct ev_check *w); +void ev_check_stop (EV_P_ struct ev_check *w); -void ev_check_start (struct ev_check *w); -void ev_check_stop (struct ev_check *w); +/* only supported in the default loop */ +void ev_signal_start (EV_P_ struct ev_signal *w); +void ev_signal_stop (EV_P_ struct ev_signal *w); + +/* only supported in the default loop */ +void ev_child_start (EV_P_ struct ev_child *w); +void ev_child_stop (EV_P_ struct ev_child *w); + +# if EV_MULTIPLICITY +/* only supported when loop to be embedded is in fact embeddable */ +void ev_embed_start (EV_P_ struct ev_embed *w); +void ev_embed_stop (EV_P_ struct ev_embed *w); +# endif -void ev_child_start (struct ev_child *w); -void ev_child_stop (struct ev_child *w); #endif #ifdef __cplusplus