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[software/libev.git] / ev.h

diff --git a/ev.h b/ev.h
index 9290378aa5df3caae305ff06077e64cd260c92aa..aa746a559102f11fcff107a152e7ae6f84ead63b 100644 (file)
--- a/ev.h
+++ b/ev.h
@@ -1,36 +1,150 @@
+/*
+ * 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
 
 #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
+
+/* 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,
+#else
+# define EV_P void
+# define EV_P_
+# define EV_A
+# define EV_A_
+#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          -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 */
+
+/* can be used to add custom fields to all watchers */
+#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
+
+/*
+ * 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 */                          \
+  void (*cb)(EV_P_ struct type *, int revents) /* private */ /* gets invoked with an eventmask */

 
 #define EV_WATCHER_LIST(type)                  \
   EV_WATCHER (type);                           \
 
 #define EV_WATCHER_LIST(type)                  \
   EV_WATCHER (type);                           \

-  struct type *next /* private */
+  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 */
+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);
+};
+
+/* base class, nothing to see here unless you subclass */
+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
 {
 struct ev_timer
 {

-  EV_WATCHER_LIST (ev_timer);
+  EV_WATCHER_TIME (ev_timer);

 
 

-  ev_tstamp at;     /* private */

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

-  unsigned char is_abs; /* ro */

 };
 
 };
 

+/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
+/* revent EV_PERIODIC */
+struct ev_periodic
+{
+  EV_WATCHER_TIME (ev_periodic);
+
+  ev_tstamp interval; /* rw */
+};
+
+/* invoked when fd is either EV_READable or EV_WRITEable */
+/* revent EV_READ, EV_WRITE */

 struct ev_io
 {
   EV_WATCHER_LIST (ev_io);
 struct ev_io
 {
   EV_WATCHER_LIST (ev_io);


@@ -39,6 +153,8 @@ struct ev_io
   int events; /* ro */
 };
 
   int events; /* ro */
 };
 

+/* invoked when the given signal has been received */
+/* revent EV_SIGNAL */

 struct ev_signal
 {
   EV_WATCHER_LIST (ev_signal);
 struct ev_signal
 {
   EV_WATCHER_LIST (ev_signal);


@@ -46,49 +162,201 @@ struct ev_signal
   int signum; /* ro */
 };
 
   int signum; /* ro */
 };
 

-#define EVMETHOD_NONE   0
-#define EVMETHOD_SELECT 1
-#define EVMETHOD_EPOLL  2
-int ev_init (int flags);
-extern int ev_method;
+/* invoked when the nothing else needs to be done, keeps the process from blocking */
+/* revent EV_IDLE */
+struct ev_idle
+{
+  EV_WATCHER (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 */
+struct 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);
+};
+
+/* invoked when sigchld is received and waitpid indicates the givne pid */
+/* revent EV_CHILD */
+/* does not support priorities */
+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 */
+};
+
+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_signal signal;
+  struct ev_idle idle;
+  struct ev_child child;
+  struct ev_prepare prepare;
+  struct ev_check check;
+};

 
 

-void ev_prefork (void);
-void ev_postfork_parent (void);
-void ev_postfork_child (void);
+#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_WIN32   64 /* NYI */
+#define EVMETHOD_ANY     ~0 /* any method, do not consult env */
+
+#if EV_PROTOTYPES
+int ev_version_major (void);
+int ev_version_minor (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 */
+struct ev_loop *ev_default_loop (int methods); /* returns default loop */
+
+/* create and destroy alternative loops that don't handle signals */
+struct ev_loop *ev_loop_new (int methods);
+void ev_loop_destroy (EV_P);
+void ev_loop_fork (EV_P);
+# else
+int ev_default_loop (int methods); /* returns true when successful */
+# 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);
+
+int ev_method (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 */

-void ev_loop (int flags);
-extern int ev_loop_done; /* set to 1 to break out of event loop */
+#define EVUNLOOP_ONCE   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 */
+
+ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */

 
 

-#define EVHOOK_PREPOLL  0 /* called before updating fds, timers and blocking */
-#define EVHOOK_POSTPOLL 1 /* called after blocking */
-#define EVHOOK_NUM      2 /* just the # of hooks */
-typedef void (*ev_hook)(void);
-void ev_hook_register (int type, ev_hook hook);
-void ev_hook_unregister (int type, ev_hook hook);
+/*
+ * 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 */
 
 /* these may evaluate ev multiple times, and the other arguments at most once */

-#define evw_init(ev,cb_,data_)             do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0)
+/* 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 {           \
+  ((struct ev_watcher *)(void *)(ev))->active   =      \
+  ((struct ev_watcher *)(void *)(ev))->pending  =      \
+  ((struct ev_watcher *)(void *)(ev))->priority = 0;   \
+  (ev)->cb = (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_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_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 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)
+#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_is_active(ev) (0 + (ev)->active) /* 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_set_cb(ev,cb_)                   ev_cb (ev) = (cb_)

 
 

-void evio_start (struct ev_io *w);
-void evio_stop  (struct ev_io *w);
+/* 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       (EV_P_ struct ev_io *w);
+void ev_io_stop        (EV_P_ struct ev_io *w);

 
 

-void evtimer_start (struct ev_timer *w);
-void evtimer_stop  (struct ev_timer *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);

 
 

-void evsignal_start (struct ev_signal *w);
-void evsignal_stop  (struct ev_signal *w);
+void ev_periodic_start (EV_P_ struct ev_periodic *w);
+void ev_periodic_stop  (EV_P_ struct ev_periodic *w);
+
+void ev_idle_start     (EV_P_ struct ev_idle *w);
+void ev_idle_stop      (EV_P_ 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_check_start    (EV_P_ struct ev_check *w);
+void ev_check_stop     (EV_P_ 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);
+#endif
+
+#ifdef __cplusplus
+}
+#endif

 
 #endif
 
 
 #endif