make timers best-effort non-drifting

[software/libev.git] / ev_select.c

diff --git a/ev_select.c b/ev_select.c
index 5f75e376504b268069d858db79319f948382735d..7fe9084c4b34a4d2792854434fe8818559d6a7a5 100644 (file)
--- a/ev_select.c
+++ b/ev_select.c
@@ -29,49 +29,74 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* for broken bsd's */
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-
 /* for unix systems */
-#ifndef WIN32
+#if WIN32
+typedef unsigned int uint32_t;
+# ifndef EV_SELECT_USE_FD_SET
+#  define EV_SELECT_USE_FD_SET 1
+# endif
+#else
 # include <sys/select.h>
+# include <inttypes.h>
+#endif
+
+#if EV_SELECT_USE_WIN32_HANDLES
+# undef EV_SELECT_USE_FD_SET
+# define EV_SELECT_USE_FD_SET 1
 #endif
 
 #include <string.h>
-#include <inttypes.h>
 
 static void
 select_modify (EV_P_ int fd, int oev, int nev)
 {
-  int offs = fd >> 3;
-  int mask = 1 << (fd & 7);
-
   if (oev == nev)
     return;
 
-  if (vec_max < (fd >> 5) + 1)
-    {
-      int new_max = (fd >> 5) + 1;
-
-      vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
-      vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
-      vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
-      vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
-
-      for (; vec_max < new_max; ++vec_max)
-        ((uint32_t *)vec_ri)[vec_max] =
-        ((uint32_t *)vec_wi)[vec_max] = 0;
-    }
-
-  vec_ri [offs] |= mask;
-  if (!(nev & EV_READ))
-    vec_ri [offs] &= ~mask;
-
-  vec_wi [offs] |= mask;
-  if (!(nev & EV_WRITE))
-    vec_wi [offs] &= ~mask;
+#if EV_SELECT_USE_FD_SET
+# if EV_SELECT_USE_WIN32_HANDLES
+  fd = _get_osfhandle (fd);
+  if (fd < 0)
+    return;
+# endif
+
+  if (nev & EV_READ)
+    FD_SET (fd, (struct fd_set *)vec_ri);
+  else
+    FD_CLR (fd, (struct fd_set *)vec_ri);
+
+  if (nev & EV_WRITE)
+    FD_SET (fd, (struct fd_set *)vec_wi);
+  else
+    FD_CLR (fd, (struct fd_set *)vec_wi);
+#else
+  {
+    int offs = fd >> 3;
+    int mask = 1 << (fd & 7);
+
+    if (vec_max < (fd >> 5) + 1)
+      {
+        int new_max = (fd >> 5) + 1;
+
+        vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
+        vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
+        vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
+        vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
+
+        for (; vec_max < new_max; ++vec_max)
+          ((uint32_t *)vec_ri)[vec_max] =
+          ((uint32_t *)vec_wi)[vec_max] = 0;
+      }
+
+    vec_ri [offs] |= mask;
+    if (!(nev & EV_READ))
+      vec_ri [offs] &= ~mask;
+
+    vec_wi [offs] |= mask;
+    if (!(nev & EV_WRITE))
+      vec_wi [offs] &= ~mask;
+  }
+#endif
 }
 
 static void
@@ -81,8 +106,13 @@ select_poll (EV_P_ ev_tstamp timeout)
   struct timeval tv;
   int res;
 
+#if EV_SELECT_USE_FD_SET
+  memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
+  memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
+#else
   memcpy (vec_ro, vec_ri, vec_max * 4);
   memcpy (vec_wo, vec_wi, vec_max * 4);
+#endif
 
   tv.tv_sec  = (long)timeout;
   tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
@@ -91,16 +121,53 @@ select_poll (EV_P_ ev_tstamp timeout)
 
   if (res < 0)
     {
+#ifdef WIN32
+      if (errno == WSAEINTR   ) errno = EINTR;
+      if (errno == WSAENOTSOCK) errno = EBADF;
+#endif
+
       if (errno == EBADF)
         fd_ebadf (EV_A);
       else if (errno == ENOMEM && !syserr_cb)
         fd_enomem (EV_A);
       else if (errno != EINTR)
-        syserr ();
+        syserr ("(libev) select");
 
       return;
     }
 
+#if EV_SELECT_USE_FD_SET
+# if EV_SELECT_USE_WIN32_HANDLES
+  for (word = 0; word < anfdmax; ++word)
+    {
+      if (!anfd [word].events)
+        {
+          int fd = _get_osfhandle (word);
+
+          if (fd >= 0)
+            {
+              int events = 0;
+
+              if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ;
+              if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE;
+
+              if (events)
+                fd_event (EV_A_ word, events);
+            }
+        }
+    }
+# else
+  for (word = 0; word < FD_SETSIZE; ++word)
+    {
+      int events = 0;
+      if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
+      if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
+
+      if (events)
+        fd_event (EV_A_ word, events);
+    }
+# endif
+#else
   for (word = vec_max; word--; )
     {
       if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
@@ -123,6 +190,7 @@ select_poll (EV_P_ ev_tstamp timeout)
                 }
           }
     }
+#endif
 }
 
 static int
@@ -132,11 +200,19 @@ select_init (EV_P_ int flags)
   method_modify = select_modify;
   method_poll   = select_poll;
 
+#if EV_SELECT_USE_FD_SET
+  vec_max = FD_SETSIZE / 32;
+  vec_ri  = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
+  vec_ro  = ev_malloc (sizeof (struct fd_set));
+  vec_wi  = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
+  vec_wo  = ev_malloc (sizeof (struct fd_set));
+#else
   vec_max = 0;
   vec_ri  = 0; 
   vec_ri  = 0;   
   vec_wo  = 0; 
   vec_wo  = 0; 
+#endif
 
   return EVMETHOD_SELECT;
 }