1 files changed, 95 insertions, 0 deletions
diff --git a/src/pkg/runtime/netpoll_epoll.c b/src/pkg/runtime/netpoll_epoll.c
new file mode 100644
index 000000000..9b5980700
--- /dev/null
+++ b/src/pkg/runtime/netpoll_epoll.c
@@ -0,0 +1,95 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+#include "runtime.h"
+#include "defs_GOOS_GOARCH.h"
+
+int32	runtime·epollcreate(int32 size);
+int32	runtime·epollcreate1(int32 flags);
+int32	runtime·epollctl(int32 epfd, int32 op, int32 fd, EpollEvent *ev);
+int32	runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+void	runtime·closeonexec(int32 fd);
+
+static int32 epfd = -1;  // epoll descriptor
+
+void
+runtime·netpollinit(void)
+{
+	epfd = runtime·epollcreate1(EPOLL_CLOEXEC);
+	if(epfd >= 0)
+		return;
+	epfd = runtime·epollcreate(1024);
+	if(epfd >= 0) {
+		runtime·closeonexec(epfd);
+		return;
+	}
+	runtime·printf("netpollinit: failed to create descriptor (%d)\n", -epfd);
+	runtime·throw("netpollinit: failed to create descriptor");
+}
+
+int32
+runtime·netpollopen(int32 fd, PollDesc *pd)
+{
+	EpollEvent ev;
+	int32 res;
+
+	ev.events = EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET;
+	ev.data = (uint64)pd;
+	res = runtime·epollctl(epfd, EPOLL_CTL_ADD, fd, &ev);
+	return -res;
+}
+
+int32
+runtime·netpollclose(int32 fd)
+{
+	EpollEvent ev;
+	int32 res;
+
+	res = runtime·epollctl(epfd, EPOLL_CTL_DEL, fd, &ev);
+	return -res;
+}
+
+// polls for ready network connections
+// returns list of goroutines that become runnable
+G*
+runtime·netpoll(bool block)
+{
+	static int32 lasterr;
+	EpollEvent events[128], *ev;
+	int32 n, i, waitms, mode;
+	G *gp;
+
+	if(epfd == -1)
+		return nil;
+	waitms = -1;
+	if(!block)
+		waitms = 0;
+retry:
+	n = runtime·epollwait(epfd, events, nelem(events), waitms);
+	if(n < 0) {
+		if(n != -EINTR && n != lasterr) {
+			lasterr = n;
+			runtime·printf("runtime: epollwait on fd %d failed with %d\n", epfd, -n);
+		}
+		goto retry;
+	}
+	gp = nil;
+	for(i = 0; i < n; i++) {
+		ev = &events[i];
+		if(ev->events == 0)
+			continue;
+		mode = 0;
+		if(ev->events & (EPOLLIN|EPOLLRDHUP|EPOLLHUP|EPOLLERR))
+			mode += 'r';
+		if(ev->events & (EPOLLOUT|EPOLLHUP|EPOLLERR))
+			mode += 'w';
+		if(mode)
+			runtime·netpollready(&gp, (void*)ev->data, mode);
+	}
+	if(block && gp == nil)
+		goto retry;
+	return gp;
+}