redis.c split into many different C files.

[redis.git] / src / ae_epoll.c

diff --git a/src/ae_epoll.c b/src/ae_epoll.c
new file mode 100644 (file)
index 0000000..d48977b
--- /dev/null
+++ b/src/ae_epoll.c
@@ -0,0 +1,91 @@
+/* Linux epoll(2) based ae.c module
+ * Copyright (C) 2009-2010 Salvatore Sanfilippo - antirez@gmail.com
+ * Released under the BSD license. See the COPYING file for more info. */
+
+#include <sys/epoll.h>
+
+typedef struct aeApiState {
+    int epfd;
+    struct epoll_event events[AE_SETSIZE];
+} aeApiState;
+
+static int aeApiCreate(aeEventLoop *eventLoop) {
+    aeApiState *state = zmalloc(sizeof(aeApiState));
+
+    if (!state) return -1;
+    state->epfd = epoll_create(1024); /* 1024 is just an hint for the kernel */
+    if (state->epfd == -1) return -1;
+    eventLoop->apidata = state;
+    return 0;
+}
+
+static void aeApiFree(aeEventLoop *eventLoop) {
+    aeApiState *state = eventLoop->apidata;
+
+    close(state->epfd);
+    zfree(state);
+}
+
+static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
+    aeApiState *state = eventLoop->apidata;
+    struct epoll_event ee;
+    /* 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.u64 = 0; /* avoid valgrind warning */
+    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;
+    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.u64 = 0; /* avoid valgrind warning */
+    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,AE_SETSIZE,
+            tvp ? (tvp->tv_sec*1000 + tvp->tv_usec/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;
+            eventLoop->fired[j].fd = e->data.fd;
+            eventLoop->fired[j].mask = mask;
+        }
+    }
+    return numevents;
+}
+
+static char *aeApiName(void) {
+    return "epoll";
+}