/*
+ * libev select fd activity backend
+ *
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
* All rights reserved.
*
* 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>
-
+#ifndef _WIN32
/* for unix systems */
-#include <sys/select.h>
+# include <sys/select.h>
+# include <inttypes.h>
+#endif
+
+#ifndef EV_SELECT_USE_FD_SET
+# ifdef NFDBITS
+# define EV_SELECT_USE_FD_SET 0
+# else
+# define EV_SELECT_USE_FD_SET 1
+# endif
+#endif
+
+#if EV_SELECT_IS_WINSOCKET
+# undef EV_SELECT_USE_FD_SET
+# define EV_SELECT_USE_FD_SET 1
+# undef EINTR
+# define EINTR WSAEINTR
+# undef EBADF
+# define EBADF WSAENOTSOCK
+# undef ENOMEM
+# define ENOMEM (errno + 1)
+#endif
+
+#if !EV_SELECT_USE_FD_SET
+# define NFDBYTES (NFDBITS / 8)
+#endif
#include <string.h>
-#include <inttypes.h>
-
-static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
-static int vec_max;
static void
-select_modify (int fd, int oev, int nev)
+select_modify (EV_P_ int fd, int oev, int nev)
{
- 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 *)realloc (vec_ri, new_max * 4);
- vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */
- vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4);
- vec_wo = (unsigned char *)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 (oev == nev)
+ return;
+
+ {
+#if EV_SELECT_USE_FD_SET
+
+ #if EV_SELECT_IS_WINSOCKET
+ SOCKET handle = anfds [fd].handle;
+ #else
+ int handle = fd;
+ #endif
+
+ if (nev & EV_READ)
+ FD_SET (handle, (fd_set *)vec_ri);
+ else
+ FD_CLR (handle, (fd_set *)vec_ri);
+
+ if (nev & EV_WRITE)
+ FD_SET (handle, (fd_set *)vec_wi);
+ else
+ FD_CLR (handle, (fd_set *)vec_wi);
+
+#else
+
+ int word = fd / NFDBITS;
+ int mask = 1UL << (fd % NFDBITS);
+
+ if (expect_false (vec_max < word + 1))
+ {
+ int new_max = word + 1;
+
+ vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
+ vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
+ vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
+ vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
+
+ for (; vec_max < new_max; ++vec_max)
+ ((fd_mask *)vec_ri)[vec_max] =
+ ((fd_mask *)vec_wi)[vec_max] = 0;
+ }
+
+ ((fd_mask *)vec_ri) [word] |= mask;
+ if (!(nev & EV_READ))
+ ((fd_mask *)vec_ri) [word] &= ~mask;
+
+ ((fd_mask *)vec_wi) [word] |= mask;
+ if (!(nev & EV_WRITE))
+ ((fd_mask *)vec_wi) [word] &= ~mask;
+#endif
+ }
}
-static void select_poll (ev_tstamp timeout)
+static void
+select_poll (EV_P_ ev_tstamp timeout)
{
struct timeval tv;
int res;
- memcpy (vec_ro, vec_ri, vec_max * 4);
- memcpy (vec_wo, vec_wi, vec_max * 4);
+#if EV_SELECT_USE_FD_SET
+ memcpy (vec_ro, vec_ri, sizeof (fd_set));
+ memcpy (vec_wo, vec_wi, sizeof (fd_set));
+#else
+ memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
+ memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
+#endif
tv.tv_sec = (long)timeout;
tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
- res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
+ res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
- if (res > 0)
+ if (expect_false (res < 0))
{
- int word, offs;
+ #if EV_SELECT_IS_WINSOCKET
+ errno = WSAGetLastError ();
+ #endif
- for (word = vec_max; word--; )
- {
- if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
- for (offs = 4; offs--; )
- {
- int idx = word * 4 + offs;
- unsigned char byte_r = vec_ro [idx];
- unsigned char byte_w = vec_wo [idx];
- int bit;
-
- if (byte_r | byte_w)
- for (bit = 8; bit--; )
- {
- int events = 0;
- events |= byte_r & (1 << bit) ? EV_READ : 0;
- events |= byte_w & (1 << bit) ? EV_WRITE : 0;
-
- if (events)
- fd_event (idx * 8 + bit, events);
- }
- }
- }
- }
- else if (res < 0)
- {
if (errno == EBADF)
- fd_recheck ();
+ fd_ebadf (EV_A);
+ else if (errno == ENOMEM && !syserr_cb)
+ fd_enomem (EV_A);
+ else if (errno != EINTR)
+ syserr ("(libev) select");
+
+ return;
}
+
+#if EV_SELECT_USE_FD_SET
+
+ {
+ int fd;
+
+ for (fd = 0; fd < anfdmax; ++fd)
+ if (anfds [fd].events)
+ {
+ int events = 0;
+ #if EV_SELECT_IS_WINSOCKET
+ SOCKET handle = anfds [fd].handle;
+ #else
+ int handle = fd;
+ #endif
+
+ if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
+ if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
+
+ if (expect_true (events))
+ fd_event (EV_A_ fd, events);
+ }
+ }
+
+#else
+
+ {
+ int word, bit;
+ for (word = vec_max; word--; )
+ {
+ fd_mask word_r = ((fd_mask *)vec_ro) [word];
+ fd_mask word_w = ((fd_mask *)vec_wo) [word];
+
+ if (word_r || word_w)
+ for (bit = NFDBITS; bit--; )
+ {
+ fd_mask mask = 1UL << bit;
+ int events = 0;
+
+ events |= word_r & mask ? EV_READ : 0;
+ events |= word_w & mask ? EV_WRITE : 0;
+
+ if (expect_true (events))
+ fd_event (EV_A_ word * NFDBITS + bit, events);
+ }
+ }
+ }
+
+#endif
+}
+
+int inline_size
+select_init (EV_P_ int flags)
+{
+ backend_fudge = 0.; /* posix says this is zero */
+ backend_modify = select_modify;
+ backend_poll = select_poll;
+
+#if EV_SELECT_USE_FD_SET
+ vec_max = FD_SETSIZE / 32;
+ vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
+ vec_ro = ev_malloc (sizeof (fd_set));
+ vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
+ vec_wo = ev_malloc (sizeof (fd_set));
+#else
+ vec_max = 0;
+ vec_ri = 0;
+ vec_ri = 0;
+ vec_wo = 0;
+ vec_wo = 0;
+#endif
+
+ return EVBACKEND_SELECT;
}
-void select_init (int flags)
+void inline_size
+select_destroy (EV_P)
{
- ev_method = EVMETHOD_SELECT;
- method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
- method_modify = select_modify;
- method_poll = select_poll;
+ ev_free (vec_ri);
+ ev_free (vec_ro);
+ ev_free (vec_wi);
+ ev_free (vec_wo);
}
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