Add exceptions support to C++ interface.

[software/libev.git] / ev.c

diff --git a/ev.c b/ev.c
index 2f46f79ba9567441c8112c087997daee11361155..d024017fe249eea3d041f920f95127652c4f7f44 100644 (file)
--- a/ev.c
+++ b/ev.c
@@ -4,29 +4,37 @@
  * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * 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:
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, 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.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, 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 OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.

  *
  *

- *     * 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.
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License ("GPL") version 2 or any later version,
+ * in which case the provisions of the GPL are applicable instead of
+ * the above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the BSD license, indicate your decision
+ * by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file under
+ * either the BSD or the GPL.

  */
 
 #ifdef __cplusplus
  */
 
 #ifdef __cplusplus


@@ -56,6 +64,14 @@ extern "C" {
 #  endif
 # endif
 
 #  endif
 # endif
 

+# ifndef EV_USE_NANOSLEEP
+#  if HAVE_NANOSLEEP
+#   define EV_USE_NANOSLEEP 1
+#  else
+#   define EV_USE_NANOSLEEP 0
+#  endif
+# endif
+

 # ifndef EV_USE_SELECT
 #  if HAVE_SELECT && HAVE_SYS_SELECT_H
 #   define EV_USE_SELECT 1
 # ifndef EV_USE_SELECT
 #  if HAVE_SELECT && HAVE_SYS_SELECT_H
 #   define EV_USE_SELECT 1


@@ -148,6 +164,10 @@ extern "C" {
 # define EV_USE_REALTIME 0
 #endif
 
 # define EV_USE_REALTIME 0
 #endif
 

+#ifndef EV_USE_NANOSLEEP
+# define EV_USE_NANOSLEEP 0
+#endif
+

 #ifndef EV_USE_SELECT
 # define EV_USE_SELECT 1
 #endif
 #ifndef EV_USE_SELECT
 # define EV_USE_SELECT 1
 #endif


@@ -209,6 +229,12 @@ extern "C" {
 # define EV_USE_INOTIFY 0
 #endif
 
 # define EV_USE_INOTIFY 0
 #endif
 

+#if !EV_USE_NANOSLEEP
+# ifndef _WIN32
+#  include <sys/select.h>
+# endif
+#endif
+

 #if EV_USE_INOTIFY
 # include <sys/inotify.h>
 #endif
 #if EV_USE_INOTIFY
 # include <sys/inotify.h>
 #endif


@@ -264,7 +290,11 @@ typedef ev_watcher *W;
 typedef ev_watcher_list *WL;
 typedef ev_watcher_time *WT;
 
 typedef ev_watcher_list *WL;
 typedef ev_watcher_time *WT;
 

-static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
+#if EV_USE_MONOTONIC
+/* sig_atomic_t is used to avoid per-thread variables or locking but still */
+/* giving it a reasonably high chance of working on typical architetcures */
+static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
+#endif

 
 #ifdef _WIN32
 # include "ev_win32.c"
 
 #ifdef _WIN32
 # include "ev_win32.c"


@@ -410,6 +440,33 @@ ev_now (EV_P)
 }
 #endif
 
 }
 #endif
 

+void
+ev_sleep (ev_tstamp delay)
+{
+  if (delay > 0.)
+    {
+#if EV_USE_NANOSLEEP
+      struct timespec ts;
+
+      ts.tv_sec  = (time_t)delay;
+      ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
+
+      nanosleep (&ts, 0);
+#elif defined(_WIN32)
+      Sleep (delay * 1e3);
+#else
+      struct timeval tv;
+
+      tv.tv_sec  = (time_t)delay;
+      tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
+
+      select (0, 0, 0, 0, &tv);
+#endif
+    }
+}
+
+/*****************************************************************************/
+

 int inline_size
 array_nextsize (int elem, int cur, int cnt)
 {
 int inline_size
 array_nextsize (int elem, int cur, int cnt)
 {


@@ -545,7 +602,11 @@ fd_reify (EV_P)
       if (events)
         {
           unsigned long argp;
       if (events)
         {
           unsigned long argp;

-          anfd->handle = _get_osfhandle (fd);
+          #ifdef EV_FD_TO_WIN32_HANDLE
+            anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
+          #else
+            anfd->handle = _get_osfhandle (fd);
+          #endif

           assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
         }
 #endif
           assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
         }
 #endif


@@ -927,9 +988,13 @@ ev_recommended_backends (void)
 unsigned int
 ev_embeddable_backends (void)
 {
 unsigned int
 ev_embeddable_backends (void)
 {

-  return EVBACKEND_EPOLL
-       | EVBACKEND_KQUEUE
-       | EVBACKEND_PORT;
+  int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
+
+  /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
+  /* please fix it and tell me how to detect the fix */
+  flags &= ~EVBACKEND_EPOLL;
+
+  return flags;

 }
 
 unsigned int
 }
 
 unsigned int


@@ -944,6 +1009,18 @@ ev_loop_count (EV_P)
   return loop_count;
 }
 
   return loop_count;
 }
 

+void
+ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
+{
+  io_blocktime = interval;
+}
+
+void
+ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
+{
+  timeout_blocktime = interval;
+}
+

 static void noinline
 loop_init (EV_P_ unsigned int flags)
 {
 static void noinline
 loop_init (EV_P_ unsigned int flags)
 {


@@ -962,6 +1039,9 @@ loop_init (EV_P_ unsigned int flags)
       now_floor = mn_now;
       rtmn_diff = ev_rt_now - mn_now;
 
       now_floor = mn_now;
       rtmn_diff = ev_rt_now - mn_now;
 

+      io_blocktime      = 0.;
+      timeout_blocktime = 0.;
+

       /* pid check not overridable via env */
 #ifndef _WIN32
       if (flags & EVFLAG_FORKCHECK)
       /* pid check not overridable via env */
 #ifndef _WIN32
       if (flags & EVFLAG_FORKCHECK)


@@ -1088,6 +1168,7 @@ loop_fork (EV_P)
         syserr ("(libev) error creating pipe");
 
       siginit (EV_A);
         syserr ("(libev) error creating pipe");
 
       siginit (EV_A);

+      sigcb (EV_A_ &sigev, EV_READ);

     }
 
   postfork = 0;
     }
 
   postfork = 0;


@@ -1119,7 +1200,7 @@ ev_loop_destroy (EV_P)
 void
 ev_loop_fork (EV_P)
 {
 void
 ev_loop_fork (EV_P)
 {

-  postfork = 1;
+  postfork = 1; // must be in line with ev_default_fork

 }
 
 #endif
 }
 
 #endif


@@ -1193,7 +1274,7 @@ ev_default_fork (void)
 #endif
 
   if (backend)
 #endif
 
   if (backend)

-    postfork = 1;
+    postfork = 1; // must be in line with ev_loop_fork

 }
 
 /*****************************************************************************/
 }
 
 /*****************************************************************************/


@@ -1458,39 +1539,50 @@ ev_loop (EV_P_ int flags)
 
       /* calculate blocking time */
       {
 
       /* calculate blocking time */
       {

-        ev_tstamp block;
+        ev_tstamp waittime  = 0.;
+        ev_tstamp sleeptime = 0.;

 
 

-        if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
-          block = 0.; /* do not block at all */
-        else
+        if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))

           {
             /* update time to cancel out callback processing overhead */
             time_update (EV_A_ 1e100);
 
           {
             /* update time to cancel out callback processing overhead */
             time_update (EV_A_ 1e100);
 

-            block = MAX_BLOCKTIME;
+            waittime = MAX_BLOCKTIME;

 
             if (timercnt)
               {
                 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
 
             if (timercnt)
               {
                 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;

-                if (block > to) block = to;
+                if (waittime > to) waittime = to;

               }
 
 #if EV_PERIODIC_ENABLE
             if (periodiccnt)
               {
                 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
               }
 
 #if EV_PERIODIC_ENABLE
             if (periodiccnt)
               {
                 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;

-                if (block > to) block = to;
+                if (waittime > to) waittime = to;

               }
 #endif
 
               }
 #endif
 

-            if (expect_false (block < 0.)) block = 0.;
+            if (expect_false (waittime < timeout_blocktime))
+              waittime = timeout_blocktime;
+
+            sleeptime = waittime - backend_fudge;
+
+            if (expect_true (sleeptime > io_blocktime))
+              sleeptime = io_blocktime;
+
+            if (sleeptime)
+              {
+                ev_sleep (sleeptime);
+                waittime -= sleeptime;
+              }

           }
 
         ++loop_count;
           }
 
         ++loop_count;

-        backend_poll (EV_A_ block);
+        backend_poll (EV_A_ waittime);

 
         /* update ev_rt_now, do magic */
 
         /* update ev_rt_now, do magic */

-        time_update (EV_A_ block);
+        time_update (EV_A_ waittime + sleeptime);

       }
 
       /* queue pending timers and reschedule them */
       }
 
       /* queue pending timers and reschedule them */


@@ -2195,7 +2287,7 @@ embed_io_cb (EV_P_ ev_io *io, int revents)
   if (ev_cb (w))
     ev_feed_event (EV_A_ (W)w, EV_EMBED);
   else
   if (ev_cb (w))
     ev_feed_event (EV_A_ (W)w, EV_EMBED);
   else

-    ev_embed_sweep (loop, w);
+    ev_loop (w->other, EVLOOP_NONBLOCK);

 }
 
 static void
 }
 
 static void


@@ -2203,8 +2295,24 @@ embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
 {
   ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
 
 {
   ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
 

-  fd_reify (w->other);
+  {
+    struct ev_loop *loop = w->other;
+
+    while (fdchangecnt)
+      {
+        fd_reify (EV_A);
+        ev_loop (EV_A_ EVLOOP_NONBLOCK);
+      }
+  }
+}
+
+#if 0
+static void
+embed_idle_cb (EV_P_ ev_idle *idle, int revents)
+{
+  ev_idle_stop (EV_A_ idle);

 }
 }

+#endif

 
 void
 ev_embed_start (EV_P_ ev_embed *w)
 
 void
 ev_embed_start (EV_P_ ev_embed *w)


@@ -2225,6 +2333,8 @@ ev_embed_start (EV_P_ ev_embed *w)
   ev_set_priority (&w->prepare, EV_MINPRI);
   ev_prepare_start (EV_A_ &w->prepare);
 
   ev_set_priority (&w->prepare, EV_MINPRI);
   ev_prepare_start (EV_A_ &w->prepare);
 

+  /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
+

   ev_start (EV_A_ (W)w, 1);
 }
 
   ev_start (EV_A_ (W)w, 1);
 }