diff options
Diffstat (limited to 'pkg/procid')
| -rw-r--r-- | pkg/procid/BUILD | 33 | ||||
| -rw-r--r-- | pkg/procid/procid.go | 21 | ||||
| -rw-r--r-- | pkg/procid/procid_amd64.s | 30 | ||||
| -rw-r--r-- | pkg/procid/procid_arm64.s | 29 | ||||
| -rw-r--r-- | pkg/procid/procid_net_test.go | 21 | ||||
| -rw-r--r-- | pkg/procid/procid_test.go | 85 |
6 files changed, 219 insertions, 0 deletions
diff --git a/pkg/procid/BUILD b/pkg/procid/BUILD new file mode 100644 index 000000000..697e7a2f4 --- /dev/null +++ b/pkg/procid/BUILD @@ -0,0 +1,33 @@ +load("//tools/go_stateify:defs.bzl", "go_library", "go_test") + +package(licenses = ["notice"]) + +go_library( + name = "procid", + srcs = [ + "procid.go", + "procid_amd64.s", + "procid_arm64.s", + ], + importpath = "gvisor.dev/gvisor/pkg/procid", + visibility = ["//visibility:public"], +) + +go_test( + name = "procid_test", + size = "small", + srcs = [ + "procid_test.go", + ], + embed = [":procid"], +) + +go_test( + name = "procid_net_test", + size = "small", + srcs = [ + "procid_net_test.go", + "procid_test.go", + ], + embed = [":procid"], +) diff --git a/pkg/procid/procid.go b/pkg/procid/procid.go new file mode 100644 index 000000000..78b92422c --- /dev/null +++ b/pkg/procid/procid.go @@ -0,0 +1,21 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Package procid provides a way to get the current system thread identifier. +package procid + +// Current returns the current system thread identifier. +// +// Precondition: This should only be called with the runtime OS thread locked. +func Current() uint64 diff --git a/pkg/procid/procid_amd64.s b/pkg/procid/procid_amd64.s new file mode 100644 index 000000000..30ec8e6e2 --- /dev/null +++ b/pkg/procid/procid_amd64.s @@ -0,0 +1,30 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// +build amd64 +// +build go1.8 +// +build !go1.14 + +#include "textflag.h" + +TEXT ·Current(SB),NOSPLIT,$0-8 + // The offset specified here is the m_procid offset for Go1.8+. + // Changes to this offset should be caught by the tests, and major + // version changes require an explicit tag change above. + MOVQ TLS, AX + MOVQ 0(AX)(TLS*1), AX + MOVQ 48(AX), AX // g_m (may change in future versions) + MOVQ 72(AX), AX // m_procid (may change in future versions) + MOVQ AX, ret+0(FP) + RET diff --git a/pkg/procid/procid_arm64.s b/pkg/procid/procid_arm64.s new file mode 100644 index 000000000..e340d9f98 --- /dev/null +++ b/pkg/procid/procid_arm64.s @@ -0,0 +1,29 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// +build arm64 +// +build go1.8 +// +build !go1.14 + +#include "textflag.h" + +TEXT ·Current(SB),NOSPLIT,$0-8 + // The offset specified here is the m_procid offset for Go1.8+. + // Changes to this offset should be caught by the tests, and major + // version changes require an explicit tag change above. + MOVD g, R0 // g + MOVD 48(R0), R0 // g_m (may change in future versions) + MOVD 72(R0), R0 // m_procid (may change in future versions) + MOVD R0, ret+0(FP) + RET diff --git a/pkg/procid/procid_net_test.go b/pkg/procid/procid_net_test.go new file mode 100644 index 000000000..b628e2285 --- /dev/null +++ b/pkg/procid/procid_net_test.go @@ -0,0 +1,21 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package procid + +// This file is just to force the inclusion of the "net" package, which will +// make the test binary a cgo one. +import ( + _ "net" +) diff --git a/pkg/procid/procid_test.go b/pkg/procid/procid_test.go new file mode 100644 index 000000000..88dd0b3ae --- /dev/null +++ b/pkg/procid/procid_test.go @@ -0,0 +1,85 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package procid + +import ( + "os" + "runtime" + "sync" + "syscall" + "testing" +) + +// runOnMain is used to send functions to run on the main (initial) thread. +var runOnMain = make(chan func(), 10) + +func checkProcid(t *testing.T, start *sync.WaitGroup, done *sync.WaitGroup) { + defer done.Done() + + runtime.LockOSThread() + defer runtime.UnlockOSThread() + + start.Done() + start.Wait() + + procID := Current() + tid := syscall.Gettid() + + if procID != uint64(tid) { + t.Logf("Bad procid: expected %v, got %v", tid, procID) + t.Fail() + } +} + +func TestProcidInitialized(t *testing.T) { + var start sync.WaitGroup + var done sync.WaitGroup + + count := 100 + start.Add(count + 1) + done.Add(count + 1) + + // Run the check on the main thread. + // + // When cgo is not included, the only case when procid isn't initialized + // is in the main (initial) thread, so we have to test this case + // specifically. + runOnMain <- func() { + checkProcid(t, &start, &done) + } + + // Run the check on a number of different threads. + for i := 0; i < count; i++ { + go checkProcid(t, &start, &done) + } + + done.Wait() +} + +func TestMain(m *testing.M) { + // Make sure we remain at the main (initial) thread. + runtime.LockOSThread() + + // Start running tests in a different goroutine. + go func() { + os.Exit(m.Run()) + }() + + // Execute any functions that have been sent for execution in the main + // thread. + for f := range runOnMain { + f() + } +} |