mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Konstantin Bogomolov
44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
// Copyright 2023 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sysmsg
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import (
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/hostsyscall"
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)
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// SleepOnState makes the caller sleep on the ThreadContext.State futex.
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func (c *ThreadContext) SleepOnState(curState ContextState, timeout *unix.Timespec) syscall.Errno {
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_, _, errno := unix.Syscall6(unix.SYS_FUTEX, uintptr(unsafe.Pointer(&c.State)),
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linux.FUTEX_WAIT, uintptr(curState), uintptr(unsafe.Pointer(timeout)), 0, 0)
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if errno == unix.EAGAIN || errno == unix.EINTR {
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errno = 0
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}
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return errno
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}
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// WakeSysmsgThread calls futex wake on Sysmsg.State.
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func (m *Msg) WakeSysmsgThread() (bool, syscall.Errno) {
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if !m.State.CompareAndSwap(ThreadStateAsleep, ThreadStatePrep) {
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return false, 0
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}
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e := hostsyscall.RawSyscallErrno(unix.SYS_FUTEX, uintptr(unsafe.Pointer(&m.State)), linux.FUTEX_WAKE, 1)
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return true, e
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}
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