summaryrefslogtreecommitdiffstats
path: root/src/ae_epoll.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/ae_epoll.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/src/ae_epoll.c b/src/ae_epoll.c
new file mode 100644
index 0000000..493ffca
--- /dev/null
+++ b/src/ae_epoll.c
@@ -0,0 +1,139 @@
+/* Linux epoll(2) based ae.c module
+ *
+ * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
+ * 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 Redis 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 OWNER 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 <sys/epoll.h>
+
+typedef struct aeApiState {
+ int epfd;
+ struct epoll_event *events;
+} aeApiState;
+
+static int aeApiCreate(aeEventLoop *eventLoop) {
+ aeApiState *state = zmalloc(sizeof(aeApiState));
+
+ if (!state) return -1;
+ state->events = zmalloc(sizeof(struct epoll_event)*eventLoop->setsize);
+ if (!state->events) {
+ zfree(state);
+ return -1;
+ }
+ state->epfd = epoll_create(1024); /* 1024 is just a hint for the kernel */
+ if (state->epfd == -1) {
+ zfree(state->events);
+ zfree(state);
+ return -1;
+ }
+ anetCloexec(state->epfd);
+ eventLoop->apidata = state;
+ return 0;
+}
+
+static int aeApiResize(aeEventLoop *eventLoop, int setsize) {
+ aeApiState *state = eventLoop->apidata;
+
+ state->events = zrealloc(state->events, sizeof(struct epoll_event)*setsize);
+ return 0;
+}
+
+static void aeApiFree(aeEventLoop *eventLoop) {
+ aeApiState *state = eventLoop->apidata;
+
+ close(state->epfd);
+ zfree(state->events);
+ zfree(state);
+}
+
+static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
+ aeApiState *state = eventLoop->apidata;
+ struct epoll_event ee = {0}; /* avoid valgrind warning */
+ /* If the fd was already monitored for some event, we need a MOD
+ * operation. Otherwise we need an ADD operation. */
+ int op = eventLoop->events[fd].mask == AE_NONE ?
+ EPOLL_CTL_ADD : EPOLL_CTL_MOD;
+
+ ee.events = 0;
+ mask |= eventLoop->events[fd].mask; /* Merge old events */
+ if (mask & AE_READABLE) ee.events |= EPOLLIN;
+ if (mask & AE_WRITABLE) ee.events |= EPOLLOUT;
+ ee.data.fd = fd;
+ if (epoll_ctl(state->epfd,op,fd,&ee) == -1) return -1;
+ return 0;
+}
+
+static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int delmask) {
+ aeApiState *state = eventLoop->apidata;
+ struct epoll_event ee = {0}; /* avoid valgrind warning */
+ int mask = eventLoop->events[fd].mask & (~delmask);
+
+ ee.events = 0;
+ if (mask & AE_READABLE) ee.events |= EPOLLIN;
+ if (mask & AE_WRITABLE) ee.events |= EPOLLOUT;
+ ee.data.fd = fd;
+ if (mask != AE_NONE) {
+ epoll_ctl(state->epfd,EPOLL_CTL_MOD,fd,&ee);
+ } else {
+ /* Note, Kernel < 2.6.9 requires a non null event pointer even for
+ * EPOLL_CTL_DEL. */
+ epoll_ctl(state->epfd,EPOLL_CTL_DEL,fd,&ee);
+ }
+}
+
+static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) {
+ aeApiState *state = eventLoop->apidata;
+ int retval, numevents = 0;
+
+ retval = epoll_wait(state->epfd,state->events,eventLoop->setsize,
+ tvp ? (tvp->tv_sec*1000 + (tvp->tv_usec + 999)/1000) : -1);
+ if (retval > 0) {
+ int j;
+
+ numevents = retval;
+ for (j = 0; j < numevents; j++) {
+ int mask = 0;
+ struct epoll_event *e = state->events+j;
+
+ if (e->events & EPOLLIN) mask |= AE_READABLE;
+ if (e->events & EPOLLOUT) mask |= AE_WRITABLE;
+ if (e->events & EPOLLERR) mask |= AE_WRITABLE|AE_READABLE;
+ if (e->events & EPOLLHUP) mask |= AE_WRITABLE|AE_READABLE;
+ eventLoop->fired[j].fd = e->data.fd;
+ eventLoop->fired[j].mask = mask;
+ }
+ } else if (retval == -1 && errno != EINTR) {
+ panic("aeApiPoll: epoll_wait, %s", strerror(errno));
+ }
+
+ return numevents;
+}
+
+static char *aeApiName(void) {
+ return "epoll";
+}