stuffs

[software/libev.git] / ev.c

diff --git a/ev.c b/ev.c
index f580a888374dde75fdc507a3bfe248feb35c692f..8a09326689781cc46d8270135b2d77ca54622ec1 100644 (file)
--- a/ev.c
+++ b/ev.c
@@ -38,11 +38,11 @@
 
 #include <assert.h>
 #include <errno.h>
 
 #include <assert.h>
 #include <errno.h>

+#include <sys/types.h>
+#include <sys/wait.h>

 #include <sys/time.h>
 #include <time.h>
 
 #include <sys/time.h>
 #include <time.h>
 

-#define HAVE_EPOLL 1
-

 #ifndef HAVE_MONOTONIC
 # ifdef CLOCK_MONOTONIC
 #  define HAVE_MONOTONIC 1
 #ifndef HAVE_MONOTONIC
 # ifdef CLOCK_MONOTONIC
 #  define HAVE_MONOTONIC 1


@@ -63,6 +63,7 @@
 
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 #define MAX_BLOCKTIME 60.
 
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 #define MAX_BLOCKTIME 60.

+#define PID_HASHSIZE  16 /* size of pid hahs table, must be power of two */

 
 #include "ev.h"
 
 
 #include "ev.h"
 


@@ -114,7 +115,13 @@ get_clock (void)
 #define array_needsize(base,cur,cnt,init)              \
   if ((cnt) > cur)                                     \
     {                                                  \
 #define array_needsize(base,cur,cnt,init)              \
   if ((cnt) > cur)                                     \
     {                                                  \

-      int newcnt = cur ? cur << 1 : 16;                        \
+      int newcnt = cur;                                        \
+      do                                               \
+        {                                              \
+          newcnt = (newcnt << 1) | 4 & ~3;             \
+        }                                              \
+      while ((cnt) > newcnt);                          \
+                                                       \

       base = realloc (base, sizeof (*base) * (newcnt));        \
       init (base + cur, newcnt - cur);                 \
       cur = newcnt;                                    \
       base = realloc (base, sizeof (*base) * (newcnt));        \
       init (base + cur, newcnt - cur);                 \
       cur = newcnt;                                    \


@@ -190,6 +197,22 @@ queue_events (W *events, int eventcnt, int type)
     event (events [i], type);
 }
 
     event (events [i], type);
 }
 

+/* called on EBADF to verify fds */
+static void
+fd_recheck (void)
+{
+  int fd;
+
+  for (fd = 0; fd < anfdmax; ++fd)
+    if (anfds [fd].wev)
+      if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
+        while (anfds [fd].head)
+          {
+            event ((W)anfds [fd].head, EV_ERROR);
+            evio_stop (anfds [fd].head);
+          }
+}
+

 /*****************************************************************************/
 
 static struct ev_timer **timers;
 /*****************************************************************************/
 
 static struct ev_timer **timers;


@@ -315,11 +338,38 @@ siginit (void)
 static struct ev_idle **idles;
 static int idlemax, idlecnt;
 
 static struct ev_idle **idles;
 static int idlemax, idlecnt;
 

+static struct ev_prepare **prepares;
+static int preparemax, preparecnt;
+

 static struct ev_check **checks;
 static int checkmax, checkcnt;
 
 /*****************************************************************************/
 
 static struct ev_check **checks;
 static int checkmax, checkcnt;
 
 /*****************************************************************************/
 

+static struct ev_child *childs [PID_HASHSIZE];
+static struct ev_signal childev;
+
+#ifndef WCONTINUED
+# define WCONTINUED 0
+#endif
+
+static void
+childcb (struct ev_signal *sw, int revents)
+{
+  struct ev_child *w;
+  int pid, status;
+
+  while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
+    for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
+      if (w->pid == pid || w->pid == -1)
+        {
+          w->status = status;
+          event ((W)w, EV_CHILD);
+        }
+}
+
+/*****************************************************************************/
+

 #if HAVE_EPOLL
 # include "ev_epoll.c"
 #endif
 #if HAVE_EPOLL
 # include "ev_epoll.c"
 #endif


@@ -327,35 +377,53 @@ static int checkmax, checkcnt;
 # include "ev_select.c"
 #endif
 
 # include "ev_select.c"
 #endif
 

+int
+ev_version_major (void)
+{
+  return EV_VERSION_MAJOR;
+}
+
+int
+ev_version_minor (void)
+{
+  return EV_VERSION_MINOR;
+}
+

 int ev_init (int flags)
 {
 int ev_init (int flags)
 {

+  if (!ev_method)
+    {

 #if HAVE_MONOTONIC
 #if HAVE_MONOTONIC

-  {
-    struct timespec ts;
-    if (!clock_gettime (CLOCK_MONOTONIC, &ts))
-      have_monotonic = 1;
-  }
+      {
+        struct timespec ts;
+        if (!clock_gettime (CLOCK_MONOTONIC, &ts))
+          have_monotonic = 1;
+      }

 #endif
 
 #endif
 

-  ev_now = ev_time ();
-  now    = get_clock ();
-  diff   = ev_now - now;
+      ev_now = ev_time ();
+      now    = get_clock ();
+      diff   = ev_now - now;

 
 

-  if (pipe (sigpipe))
-    return 0;
+      if (pipe (sigpipe))
+        return 0;

 
 

-  ev_method = EVMETHOD_NONE;
+      ev_method = EVMETHOD_NONE;

 #if HAVE_EPOLL
 #if HAVE_EPOLL

-  if (ev_method == EVMETHOD_NONE) epoll_init (flags);
+      if (ev_method == EVMETHOD_NONE) epoll_init (flags);

 #endif
 #if HAVE_SELECT
 #endif
 #if HAVE_SELECT

-  if (ev_method == EVMETHOD_NONE) select_init (flags);
+      if (ev_method == EVMETHOD_NONE) select_init (flags);

 #endif
 
 #endif
 

-  if (ev_method)
-    {
-      evw_init (&sigev, sigcb);
-      siginit ();
+      if (ev_method)
+        {
+          evw_init (&sigev, sigcb);
+          siginit ();
+
+          evsignal_init (&childev, childcb, SIGCHLD);
+          evsignal_start (&childev);
+        }

     }
 
   return ev_method;
     }
 
   return ev_method;


@@ -363,17 +431,20 @@ int ev_init (int flags)
 
 /*****************************************************************************/
 
 
 /*****************************************************************************/
 

-void ev_prefork (void)
+void
+ev_prefork (void)

 {
   /* nop */
 }
 
 {
   /* nop */
 }
 

-void ev_postfork_parent (void)
+void
+ev_postfork_parent (void)

 {
   /* nop */
 }
 
 {
   /* nop */
 }
 

-void ev_postfork_child (void)
+void
+ev_postfork_child (void)

 {
 #if HAVE_EPOLL
   if (ev_method == EVMETHOD_EPOLL)
 {
 #if HAVE_EPOLL
   if (ev_method == EVMETHOD_EPOLL)


@@ -416,13 +487,11 @@ fd_reify (void)
 }
 
 static void
 }
 
 static void

-call_pending ()
+call_pending (void)

 {
 {

-  int i;
-
-  for (i = 0; i < pendingcnt; ++i)
+  while (pendingcnt)

     {
     {

-      ANPENDING *p = pendings + i;
+      ANPENDING *p = pendings + --pendingcnt;

 
       if (p->w)
         {
 
       if (p->w)
         {


@@ -430,12 +499,10 @@ call_pending ()
           p->w->cb (p->w, p->events);
         }
     }
           p->w->cb (p->w, p->events);
         }
     }

-
-  pendingcnt = 0;

 }
 
 static void
 }
 
 static void

-timers_reify ()
+timers_reify (void)

 {
   while (timercnt && timers [0]->at <= now)
     {
 {
   while (timercnt && timers [0]->at <= now)
     {


@@ -456,7 +523,7 @@ timers_reify ()
 }
 
 static void
 }
 
 static void

-periodics_reify ()
+periodics_reify (void)

 {
   while (periodiccnt && periodics [0]->at <= ev_now)
     {
 {
   while (periodiccnt && periodics [0]->at <= ev_now)
     {


@@ -502,7 +569,7 @@ periodics_reschedule (ev_tstamp diff)
 }
 
 static void
 }
 
 static void

-time_update ()
+time_update (void)

 {
   int i;
 
 {
   int i;
 


@@ -548,20 +615,22 @@ void ev_loop (int flags)
   double block;
   ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
 
   double block;
   ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
 

-  if (checkcnt)
-    {
-      queue_events ((W *)checks, checkcnt, EV_CHECK);
-      call_pending ();
-    }
-

   do
     {
   do
     {

+      /* queue check watchers (and execute them) */
+      if (preparecnt)
+        {
+          queue_events ((W *)prepares, preparecnt, EV_PREPARE);
+          call_pending ();
+        }
+

       /* update fd-related kernel structures */
       fd_reify ();
 
       /* calculate blocking time */
 
       /* update fd-related kernel structures */
       fd_reify ();
 
       /* calculate blocking time */
 

-      /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
+      /* we only need this for !monotonic clockor timers, but as we basically
+         always have timers, we just calculate it always */

       ev_now = ev_time ();
 
       if (flags & EVLOOP_NONBLOCK || idlecnt)
       ev_now = ev_time ();
 
       if (flags & EVLOOP_NONBLOCK || idlecnt)


@@ -591,15 +660,16 @@ void ev_loop (int flags)
       time_update ();
 
       /* queue pending timers and reschedule them */
       time_update ();
 
       /* queue pending timers and reschedule them */

-      periodics_reify (); /* absolute timers first */
-      timers_reify (); /* relative timers second */
+      timers_reify (); /* relative timers called last */
+      periodics_reify (); /* absolute timers called first */

 
       /* queue idle watchers unless io or timers are pending */
       if (!pendingcnt)
         queue_events ((W *)idles, idlecnt, EV_IDLE);
 
 
       /* queue idle watchers unless io or timers are pending */
       if (!pendingcnt)
         queue_events ((W *)idles, idlecnt, EV_IDLE);
 

-      /* queue check and possibly idle watchers */
-      queue_events ((W *)checks, checkcnt, EV_CHECK);
+      /* queue check watchers, to be executed first */
+      if (checkcnt)
+        queue_events ((W *)checks, checkcnt, EV_CHECK);

 
       call_pending ();
     }
 
       call_pending ();
     }


@@ -828,6 +898,26 @@ void evidle_stop (struct ev_idle *w)
   ev_stop ((W)w);
 }
 
   ev_stop ((W)w);
 }
 

+void evprepare_start (struct ev_prepare *w)
+{
+  if (ev_is_active (w))
+    return;
+
+  ev_start ((W)w, ++preparecnt);
+  array_needsize (prepares, preparemax, preparecnt, );
+  prepares [preparecnt - 1] = w;
+}
+
+void evprepare_stop (struct ev_prepare *w)
+{
+  ev_clear ((W)w);
+  if (ev_is_active (w))
+    return;
+
+  prepares [w->active - 1] = prepares [--preparecnt];
+  ev_stop ((W)w);
+}
+

 void evcheck_start (struct ev_check *w)
 {
   if (ev_is_active (w))
 void evcheck_start (struct ev_check *w)
 {
   if (ev_is_active (w))


@@ -848,6 +938,25 @@ void evcheck_stop (struct ev_check *w)
   ev_stop ((W)w);
 }
 
   ev_stop ((W)w);
 }
 

+void evchild_start (struct ev_child *w)
+{
+  if (ev_is_active (w))
+    return;
+
+  ev_start ((W)w, 1);
+  wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+}
+
+void evchild_stop (struct ev_child *w)
+{
+  ev_clear ((W)w);
+  if (ev_is_active (w))
+    return;
+
+  wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
+  ev_stop ((W)w);
+}
+

 /*****************************************************************************/
 
 struct ev_once
 /*****************************************************************************/
 
 struct ev_once