f8d9fa9e80
This upgrades all of libgo other than the runtime package to the Go 1.4 release. In Go 1.4 much of the runtime was rewritten into Go. Merging that code will take more time and will not change the API, so I'm putting it off for now. There are a few runtime changes anyhow, to accomodate other packages that rely on minor modifications to the runtime support. The compiler changes slightly to add a one-bit flag to each type descriptor kind that is stored directly in an interface, which for gccgo is currently only pointer types. Another one-bit flag (gcprog) is reserved because it is used by the gc compiler, but gccgo does not currently use it. There is another error check in the compiler since I ran across it during testing. gotools/: * Makefile.am (go_cmd_go_files): Sort entries. Add generate.go. * Makefile.in: Rebuild. From-SVN: r219627
98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux
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package runtime
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import "unsafe"
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func epollcreate(size int32) int32
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func epollcreate1(flags int32) int32
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//go:noescape
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func epollctl(epfd, op, fd int32, ev *epollevent) int32
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//go:noescape
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func epollwait(epfd int32, ev *epollevent, nev, timeout int32) int32
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func closeonexec(fd int32)
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var (
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epfd int32 = -1 // epoll descriptor
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netpolllasterr int32
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)
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func netpollinit() {
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epfd = epollcreate1(_EPOLL_CLOEXEC)
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if epfd >= 0 {
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return
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}
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epfd = epollcreate(1024)
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if epfd >= 0 {
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closeonexec(epfd)
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return
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}
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println("netpollinit: failed to create epoll descriptor", -epfd)
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gothrow("netpollinit: failed to create descriptor")
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}
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func netpollopen(fd uintptr, pd *pollDesc) int32 {
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var ev epollevent
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ev.events = _EPOLLIN | _EPOLLOUT | _EPOLLRDHUP | _EPOLLET
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*(**pollDesc)(unsafe.Pointer(&ev.data)) = pd
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return -epollctl(epfd, _EPOLL_CTL_ADD, int32(fd), &ev)
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}
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func netpollclose(fd uintptr) int32 {
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var ev epollevent
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return -epollctl(epfd, _EPOLL_CTL_DEL, int32(fd), &ev)
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}
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func netpollarm(pd *pollDesc, mode int) {
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gothrow("unused")
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}
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// polls for ready network connections
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// returns list of goroutines that become runnable
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func netpoll(block bool) (gp *g) {
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if epfd == -1 {
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return
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}
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waitms := int32(-1)
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if !block {
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waitms = 0
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}
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var events [128]epollevent
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retry:
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n := epollwait(epfd, &events[0], int32(len(events)), waitms)
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if n < 0 {
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if n != -_EINTR && n != netpolllasterr {
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netpolllasterr = n
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println("runtime: epollwait on fd", epfd, "failed with", -n)
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}
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goto retry
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}
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for i := int32(0); i < n; i++ {
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ev := &events[i]
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if ev.events == 0 {
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continue
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}
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var mode int32
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if ev.events&(_EPOLLIN|_EPOLLRDHUP|_EPOLLHUP|_EPOLLERR) != 0 {
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mode += 'r'
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}
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if ev.events&(_EPOLLOUT|_EPOLLHUP|_EPOLLERR) != 0 {
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mode += 'w'
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}
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if mode != 0 {
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pd := *(**pollDesc)(unsafe.Pointer(&ev.data))
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netpollready((**g)(noescape(unsafe.Pointer(&gp))), pd, mode)
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}
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}
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if block && gp == nil {
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goto retry
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}
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return gp
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}
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