modified IOMultiplexer (added epoll & kevent support)

[TransparentIRC.git] / src / IOEngine_kevent.c

diff --git a/src/IOEngine_kevent.c b/src/IOEngine_kevent.c
new file mode 100644 (file)
index 0000000..5d6f55b
--- /dev/null
+++ b/src/IOEngine_kevent.c
@@ -0,0 +1,166 @@
+/* IOengine_kevent.c - TransparentIRC 0.1
+ * Copyright (C) 2011-2012  Philipp Kreil (pk910)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License 
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. 
+ */
+#include "IOEngine.h"
+#include "IOHandler.h"
+
+#ifdef HAVE_SYS_EVENT_H
+#include <sys/event.h>
+
+#define MAX_EVENTS 32
+
+static int kevent_fd;
+
+static int engine_kevent_init() {
+    kevent_fd = kqueue();
+    if (kevent_fd < 0)
+        return 0;
+    return 1;
+}
+
+static void engine_kevent_add(struct IODescriptor *iofd) {
+    if(iofd->type == IOTYPE_TIMER) return;
+    //add descriptor to the kevent queue
+    struct kevent changes[2];
+    int nchanges = 0;
+    int res;
+
+    EV_SET(&changes[nchanges++], iofd->fd, EVFILT_READ, EV_ADD, 0, 0, iofd);
+    if (iohandler_wants_writes(iofd))
+        EV_SET(&changes[nchanges++], iofd->fd, EVFILT_WRITE, EV_ADD, 0, 0, iofd);
+    
+    res = kevent(kevent_fd, changes, nchanges, NULL, 0, NULL);
+    if(res < 0)
+        iohandler_log(IOLOG_ERROR, "could not add IODescriptor %d to kevent queue. (returned: %d)", res);
+    }
+}
+
+static void engine_kevent_remove(struct IODescriptor *iofd) {
+    if(iofd->type == IOTYPE_TIMER) return;
+    struct kevent changes[2];
+    int nchanges = 0;
+
+    EV_SET(&changes[nchanges++], iofd->fd, EVFILT_READ, EV_DELETE, 0, 0, iofd);
+    EV_SET(&changes[nchanges++], iofd->fd, EVFILT_WRITE, EV_DELETE, 0, 0, iofd);
+    kevent(kevent_fd, changes, nchanges, NULL, 0, NULL);
+}
+
+static void engine_kevent_update(struct IODescriptor *iofd) {
+    if(iofd->type == IOTYPE_TIMER) return;
+    struct kevent changes[2];
+    int nchanges = 0;
+    int res;
+
+    EV_SET(&changes[nchanges++], iofd->fd, EVFILT_READ, EV_ADD, 0, 0, iofd);
+    EV_SET(&changes[nchanges++], iofd->fd, EVFILT_WRITE, iohandler_wants_writes(iofd) ? EV_ADD : EV_DELETE, 0, 0, iofd);
+    
+    res = kevent(kevent_fd, changes, nchanges, NULL, 0, NULL);
+    if(res < 0) {
+        iohandler_log(IOLOG_ERROR, "could not update IODescriptor %d in kevent queue. (returned: %d)", res);
+    }
+}
+
+static void engine_kevent_loop(struct timeval *timeout) {
+    struct kevent evts[MAX_EVENTS];
+    struct timeval now, tdiff;
+    struct timespec ts, *ptr
+    int msec;
+    int events;
+    int kevent_result;
+    
+    gettimeofday(&now, NULL);
+    
+    while(timer_priority) {
+        tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+        tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+        if(tdiff.tv_sec < 0 || (tdiff.tv_sec == 0 && tdiff.tv_usec <= 0)) {
+            iohandler_events(timer_priority, 0, 0);
+            iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+            continue;
+        } else if(tdiff.tv_usec < 0) {
+            tdiff.tv_sec--;
+            tdiff.tv_usec += 1000000; //1 sec
+        }
+        if(timeval_is_smaler((&tdiff), timeout)) {
+            timeout->tv_sec = tdiff.tv_sec;
+            timeout->tv_usec = tdiff.tv_usec;
+        }
+        break;
+    }
+    
+    if (timeout) {
+        ts.tv_sec = timeout->tv_sec;
+        ts.tv_nsec = timeout->tv_usec * 1000;
+        pts = &ts;
+    } else {
+        pts = NULL;
+    }
+    
+    //select system call
+    kevent_result = kevent(kq_fd, NULL, 0, events, MAX_EVENTS, pts);
+    
+    if (kevent_result < 0) {
+        if (errno != EINTR) {
+            iohandler_log(IOLOG_FATAL, "kevent() failed with errno %d: %s", errno, strerror(errno));
+            return;
+        }
+    } else {
+        int i;
+        for(i = 0; i < kevent_result; i++)
+            iohandler_events(evts[i].udata, (evts[i].filter == EVFILT_READ), (evts[i].filter == EVFILT_WRITE));
+    }
+    
+    //check timers
+    while(timer_priority) {
+        tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+        tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+        if(tdiff.tv_sec < 0 || (tdiff.tv_sec == 0 && tdiff.tv_usec <= 0)) {
+            iohandler_events(timer_priority, 0, 0);
+            iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+            continue;
+        }
+        break;
+    }
+    
+}
+
+static void engine_kevent_cleanup() {
+    close(kevent_fd);
+}
+
+struct IOEngine engine_kevent = {
+    .name = "kevent",
+    .init = engine_kevent_init,
+    .add = engine_kevent_add,
+    .remove = engine_kevent_remove,
+    .update = engine_kevent_update,
+    .loop = engine_kevent_loop,
+    .cleanup = engine_kevent_cleanup,
+};
+
+#else
+
+struct IOEngine engine_kevent = {
+    .name = "kevent",
+    .init = NULL,
+    .add = NULL,
+    .remove = NULL,
+    .update = NULL,
+    .loop = NULL,
+    .cleanup = NULL,
+};
+
+#endif