pico.v and dependencies

thirdparty/picoev/src/picoev_epoll.c

@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2009, Cybozu Labs, Inc.
+ * 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.
+ * * Neither the name of the <ORGANIZATION> nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ * 
+ * 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 HOLDER 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.
+ */
+
+#include <errno.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#include "picoev.h"
+
+#ifndef PICOEV_EPOLL_DEFER_DELETES
+# define PICOEV_EPOLL_DEFER_DELETES 1
+#endif
+
+typedef struct picoev_loop_epoll_st {
+  picoev_loop loop;
+  int epfd;
+  struct epoll_event events[1024];
+} picoev_loop_epoll;
+
+picoev_globals picoev;
+
+picoev_loop* picoev_create_loop(int max_timeout)
+{
+  picoev_loop_epoll* loop;
+  
+  /* init parent */
+  assert(PICOEV_IS_INITED);
+  if ((loop = (picoev_loop_epoll*)malloc(sizeof(picoev_loop_epoll))) == NULL) {
+    return NULL;
+  }
+  if (picoev_init_loop_internal(&loop->loop, max_timeout) != 0) {
+    free(loop);
+    return NULL;
+  }
+  
+  /* init myself */
+  if ((loop->epfd = epoll_create(picoev.max_fd)) == -1) {
+    picoev_deinit_loop_internal(&loop->loop);
+    free(loop);
+    return NULL;
+  }
+  
+  loop->loop.now = time(NULL);
+  return &loop->loop;
+}
+
+int picoev_destroy_loop(picoev_loop* _loop)
+{
+  picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
+  
+  if (close(loop->epfd) != 0) {
+    return -1;
+  }
+  picoev_deinit_loop_internal(&loop->loop);
+  free(loop);
+  return 0;
+}
+
+int picoev_update_events_internal(picoev_loop* _loop, int fd, int events)
+{
+  picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
+  picoev_fd* target = picoev.fds + fd;
+  struct epoll_event ev;
+  int epoll_ret;
+  
+  memset( &ev, 0, sizeof( ev ) );
+  assert(PICOEV_FD_BELONGS_TO_LOOP(&loop->loop, fd));
+  
+  if ((events & PICOEV_READWRITE) == target->events) {
+    return 0;
+  }
+  
+  ev.events = ((events & PICOEV_READ) != 0 ? EPOLLIN : 0)
+    | ((events & PICOEV_WRITE) != 0 ? EPOLLOUT : 0);
+  ev.data.fd = fd;
+  
+#define SET(op, check_error) do {		    \
+    epoll_ret = epoll_ctl(loop->epfd, op, fd, &ev); \
+    assert(! check_error || epoll_ret == 0);	    \
+  } while (0)
+  
+#if PICOEV_EPOLL_DEFER_DELETES
+  
+  if ((events & PICOEV_DEL) != 0) {
+    /* nothing to do */
+  } else if ((events & PICOEV_READWRITE) == 0) {
+    SET(EPOLL_CTL_DEL, 1);
+  } else {
+    SET(EPOLL_CTL_MOD, 0);
+    if (epoll_ret != 0) {
+      assert(errno == ENOENT);
+      SET(EPOLL_CTL_ADD, 1);
+    }
+  }
+  
+#else
+  
+  if ((events & PICOEV_READWRITE) == 0) {
+    SET(EPOLL_CTL_DEL, 1);
+  } else {
+    SET(target->events == 0 ? EPOLL_CTL_ADD : EPOLL_CTL_MOD, 1);
+  }
+  
+#endif
+  
+#undef SET
+  
+  target->events = events;
+  
+  return 0;
+}
+
+int picoev_poll_once_internal(picoev_loop* _loop, int max_wait)
+{
+  picoev_loop_epoll* loop = (picoev_loop_epoll*)_loop;
+  int i, nevents;
+  
+  nevents = epoll_wait(loop->epfd, loop->events,
+		       sizeof(loop->events) / sizeof(loop->events[0]),
+		       max_wait * 1000);
+  if (nevents == -1) {
+    return -1;
+  }
+  for (i = 0; i < nevents; ++i) {
+    struct epoll_event* event = loop->events + i;
+    picoev_fd* target = picoev.fds + event->data.fd;
+    if (loop->loop.loop_id == target->loop_id
+	&& (target->events & PICOEV_READWRITE) != 0) {
+      int revents = ((event->events & EPOLLIN) != 0 ? PICOEV_READ : 0)
+	| ((event->events & EPOLLOUT) != 0 ? PICOEV_WRITE : 0);
+      if (revents != 0) {
+	(*target->callback)(&loop->loop, event->data.fd, revents,
+			    target->cb_arg);
+      }
+    } else {
+#if PICOEV_EPOLL_DEFER_DELETES
+      event->events = 0;
+      epoll_ctl(loop->epfd, EPOLL_CTL_DEL, event->data.fd, event);
+#endif
+    }
+  }
+  return 0;
+}