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[software/libev.git] / ev.h

diff --git a/ev.h b/ev.h
index 300573b5298fa9bdeead556c644ba5d2f059e8d1..9fcae613de03f1902451493cb74b516d2c3041c5 100644 (file)
--- a/ev.h
+++ b/ev.h
@@ -1,85 +1,496 @@
-#ifndef EV_H
-#define EV_H
+/*
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *
+ *     * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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 EV_H__
+#define EV_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif

 
 typedef double ev_tstamp;
 
 
 typedef double ev_tstamp;
 

+/* these priorities are inclusive, higher priorities will be called earlier */
+#ifndef EV_MINPRI
+# define EV_MINPRI -2
+#endif
+#ifndef EV_MAXPRI
+# define EV_MAXPRI +2
+#endif
+
+#ifndef EV_MULTIPLICITY
+# define EV_MULTIPLICITY 1
+#endif
+
+#ifndef EV_PERIODIC_ENABLE
+# define EV_PERIODIC_ENABLE 1
+#endif
+
+#ifndef EV_STAT_ENABLE
+# define EV_STAT_ENABLE 1
+#endif
+
+#ifndef EV_EMBED_ENABLE
+# define EV_EMBED_ENABLE 1
+#endif
+
+/*****************************************************************************/
+
+#if EV_STAT_ENABLE
+# include <sys/stat.h>
+#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_
+
+# undef EV_EMBED_ENABLE
+#endif
+

 /* eventmask, revents, events... */
 /* eventmask, revents, events... */

-#define EV_UNDEF   -1 /* guaranteed to be invalid */
-#define EV_NONE    0
-#define EV_READ    1
-#define EV_WRITE   2
-#define EV_TIMEOUT 4
-#define EV_SIGNAL  8
+#define EV_UNDEF            -1L /* guaranteed to be invalid */
+#define EV_NONE           0x00L /* no events */
+#define EV_READ           0x01L /* ev_io detected read will not block */
+#define EV_WRITE          0x02L /* ev_io detected write will not block */
+#define EV_TIMEOUT  0x00000100L /* timer timed out */
+#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
+#define EV_SIGNAL   0x00000400L /* signal was received */
+#define EV_IDLE     0x00000800L /* event loop is idling */
+#define EV_PREPARE  0x00001000L /* event loop about to poll */
+#define EV_CHECK    0x00002000L /* event loop finished poll */
+#define EV_CHILD    0x00004000L /* child/pid had status change */
+#define EV_EMBED    0x00008000L /* embedded event loop needs sweep */
+#define EV_STAT     0x00010000L /* stat data changed */
+#define EV_ERROR    0x80000000L /* sent when an error occurs */
+
+/* can be used to add custom fields to all watchers, while losing binary compatibility */
+#ifndef EV_COMMON
+# define EV_COMMON void *data;
+#endif
+#ifndef EV_PROTOTYPES
+# define EV_PROTOTYPES 1
+#endif
+
+#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.
+ * ro: can be read anytime, but only changed when the watcher isn't active
+ * rw: can be read and modified anytime, even when the watcher is active
+ */

 
 /* shared by all watchers */
 #define EV_WATCHER(type)                       \
   int active; /* private */                    \
   int pending; /* private */                   \
 
 /* shared by all watchers */
 #define EV_WATCHER(type)                       \
   int active; /* private */                    \
   int pending; /* private */                   \

-  void *data; /* rw */                         \
-  void (*cb)(struct type *, int revents) /* rw */
+  int priority; /* private */                  \
+  EV_COMMON /* rw */                           \
+  EV_CB_DECLARE (type) /* private */

 
 #define EV_WATCHER_LIST(type)                  \
 
 #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 */
+
+/* base class, nothing to see here unless you subclass */
+typedef struct ev_watcher
+{
+  EV_WATCHER (ev_watcher)
+} ev_watcher;
+
+/* base class, nothing to see here unless you subclass */
+typedef struct ev_watcher_list
+{
+  EV_WATCHER_LIST (ev_watcher_list)
+} ev_watcher_list;

 
 

-struct ev_timer
+/* base class, nothing to see here unless you subclass */
+typedef struct ev_watcher_time

 {
 {

-  EV_WATCHER_LIST (ev_timer);
+  EV_WATCHER_TIME (ev_watcher_time)
+} ev_watcher_time;
+
+/* invoked after a specific time, repeatable (based on monotonic clock) */
+/* revent EV_TIMEOUT */
+typedef struct ev_timer
+{
+  EV_WATCHER_TIME (ev_timer)

 
 

-  ev_tstamp at;     /* ro */

   ev_tstamp repeat; /* rw */
   ev_tstamp repeat; /* rw */

-  unsigned char is_abs; /* rw */
-};
+} ev_timer;
+
+/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
+/* revent EV_PERIODIC */
+typedef struct ev_periodic
+{
+  EV_WATCHER_TIME (ev_periodic)
+
+  ev_tstamp interval; /* rw */
+  ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* rw */
+} ev_periodic;

 
 

-struct ev_io
+/* invoked when fd is either EV_READable or EV_WRITEable */
+/* revent EV_READ, EV_WRITE */
+typedef struct ev_io

 {
 {

-  EV_WATCHER_LIST (ev_io);
+  EV_WATCHER_LIST (ev_io)

 
   int fd;     /* ro */
   int events; /* ro */
 
   int fd;     /* ro */
   int events; /* ro */

-};
+} ev_io;

 
 

-struct ev_signal
+/* invoked when the given signal has been received */
+/* revent EV_SIGNAL */
+typedef struct ev_signal

 {
 {

-  EV_WATCHER_LIST (ev_signal);
+  EV_WATCHER_LIST (ev_signal)

 
   int signum; /* ro */
 
   int signum; /* ro */

+} ev_signal;
+
+/* invoked when the nothing else needs to be done, keeps the process from blocking */
+/* revent EV_IDLE */
+typedef struct ev_idle
+{
+  EV_WATCHER (ev_idle)
+} ev_idle;
+
+/* invoked for each run of the mainloop, just before the blocking call */
+/* you can still change events in any way you like */
+/* revent EV_PREPARE */
+typedef struct ev_prepare
+{
+  EV_WATCHER (ev_prepare)
+} ev_prepare;
+
+/* invoked for each run of the mainloop, just after the blocking call */
+/* revent EV_CHECK */
+typedef struct ev_check
+{
+  EV_WATCHER (ev_check)
+} ev_check;
+
+/* invoked when sigchld is received and waitpid indicates the given pid */
+/* revent EV_CHILD */
+/* does not support priorities */
+typedef struct 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 */
+} ev_child;
+
+#if EV_EMBED_ENABLE
+/* used to embed an event loop inside another */
+/* the callback gets invoked when the event loop has handled events, and can be 0 */
+typedef struct ev_embed
+{
+  EV_WATCHER (ev_embed)
+
+  ev_io io; /* private */
+  struct ev_loop *loop; /* ro */
+} ev_embed;
+#endif
+
+#if EV_STAT_ENABLE
+/* st_nlink = 0 means missing file or other error */
+typedef struct stat ev_statdata;
+
+/* invoked each time the stat data changes for a given path */
+/* revent EV_STAT */
+typedef struct ev_stat
+{
+  EV_WATCHER (ev_stat)
+
+  ev_timer timer;     /* private */
+  ev_tstamp interval; /* rw */
+  const char *path;   /* ro */
+  ev_statdata prev;   /* ro */
+  ev_statdata attr;   /* ro */
+} ev_stat;
+#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;
+#if EV_EMBED_ENABLE
+  struct ev_embed embed;
+#endif
+#if EV_STAT_ENABLE
+  struct ev_stat stat;
+#endif

 };
 
 };
 

-#define EVMETHOD_NONE   0
-#define EVMETHOD_SELECT 1
-#define EVMETHOD_EPOLL  2
-int ev_init (int flags);
-extern int ev_method;
+/* 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
+int ev_version_major (void);
+int ev_version_minor (void);

 
 

-void ev_prefork (void);
-void ev_postfork_parent (void);
-void ev_postfork_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);
 
 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 EVLOOP_NONBLOCK        1 /* do not block/wait */
 #define EVLOOP_ONESHOT 2 /* block *once* only */

-int ev_loop (int flags);
-extern int ev_loop_done; /* set to 1 to break out of event loop */
+#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 (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 (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_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
+#define ev_init(ev,cb_) do {                           \
+  ((ev_watcher *)(void *)(ev))->active   =     \
+  ((ev_watcher *)(void *)(ev))->pending  =     \
+  ((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_,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_stat_set(ev,path_,interval_)     do { (ev)->path = (path_); (ev)->interval = (interval_); } 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_stat_init(ev,cb,path,interval)   do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
+
+#define ev_is_pending(ev)                   (0 + ((ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
+#define ev_is_active(ev)                    (0 + ((ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */
+
+#define ev_priority(ev)                     ((ev_watcher *)(void *)(ev))->priority /* rw */
+#define ev_cb(ev)                           (ev)->cb /* rw */
+#define ev_set_priority(ev,pri)             ev_priority (ev) = (pri)
+
+#ifndef ev_set_cb
+# define ev_set_cb(ev,cb_)                  ev_cb (ev) = (cb_)
+#endif

 
 

-#define evw_init(ev,cb_,data_)             do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0)
-#define evio_set(ev,fd_,events_)           do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
-#define evtimer_set_rel(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); (ev)->is_abs = 0; } while (0)
-#define evtimer_set_abs(ev,at_,repeat_)    do { (ev)->at = (at_); (ev)->repeat = (repeat_); (ev)->is_abs = 1; } while (0)
-#define evsignal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
+/* 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

 
 

-#define ev_is_active(ev) (0 + (ev)->active) /* wether the watcher has been started */
+/* 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 evio_start (struct ev_io *w);
-void evio_stop  (struct ev_io *w);
+void ev_io_start       (EV_P_ ev_io *w);
+void ev_io_stop        (EV_P_ ev_io *w);

 
 

-void evtimer_start (struct ev_timer *w);
-void evtimer_stop  (struct ev_timer *w);
+void ev_timer_start    (EV_P_ ev_timer *w);
+void ev_timer_stop     (EV_P_ 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_ ev_timer *w);

 
 

-void evsignal_start (struct ev_signal *w);
-void evsignal_stop  (struct ev_signal *w);
+#if EV_PERIODIC_ENABLE
+void ev_periodic_start (EV_P_ ev_periodic *w);
+void ev_periodic_stop  (EV_P_ ev_periodic *w);
+void ev_periodic_again (EV_P_ ev_periodic *w);
+#endif
+
+void ev_idle_start     (EV_P_ ev_idle *w);
+void ev_idle_stop      (EV_P_ ev_idle *w);
+
+void ev_prepare_start  (EV_P_ ev_prepare *w);
+void ev_prepare_stop   (EV_P_ ev_prepare *w);
+
+void ev_check_start    (EV_P_ ev_check *w);
+void ev_check_stop     (EV_P_ ev_check *w);
+
+/* only supported in the default loop */
+void ev_signal_start   (EV_P_ ev_signal *w);
+void ev_signal_stop    (EV_P_ ev_signal *w);
+
+/* only supported in the default loop */
+void ev_child_start    (EV_P_ ev_child *w);
+void ev_child_stop     (EV_P_ ev_child *w);
+
+# if EV_EMBED_ENABLE
+/* only supported when loop to be embedded is in fact embeddable */
+void ev_embed_start    (EV_P_ ev_embed *w);
+void ev_embed_stop     (EV_P_ ev_embed *w);
+void ev_embed_sweep    (EV_P_ ev_embed *w);
+# endif
+
+# if EV_STAT_ENABLE
+void ev_stat_start     (EV_P_ ev_stat *w);
+void ev_stat_stop      (EV_P_ ev_stat *w);
+void ev_stat_stat      (EV_P_ ev_stat *w);
+# endif
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif

 
 #endif
 
 
 #endif