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-rw-r--r--pkg/goid/BUILD3
-rw-r--r--pkg/goid/empty_test.go22
-rw-r--r--pkg/goid/goid.go56
-rw-r--r--pkg/goid/goid_race.go25
-rw-r--r--pkg/goid/goid_test.go99
-rw-r--r--pkg/goid/goid_unsafe.go64
6 files changed, 105 insertions, 164 deletions
diff --git a/pkg/goid/BUILD b/pkg/goid/BUILD
index 7a82631c5..d855b702c 100644
--- a/pkg/goid/BUILD
+++ b/pkg/goid/BUILD
@@ -8,8 +8,6 @@ go_library(
"goid.go",
"goid_amd64.s",
"goid_arm64.s",
- "goid_race.go",
- "goid_unsafe.go",
],
visibility = ["//visibility:public"],
)
@@ -18,7 +16,6 @@ go_test(
name = "goid_test",
size = "small",
srcs = [
- "empty_test.go",
"goid_test.go",
],
library = ":goid",
diff --git a/pkg/goid/empty_test.go b/pkg/goid/empty_test.go
deleted file mode 100644
index c0a4b17ab..000000000
--- a/pkg/goid/empty_test.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2020 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 !race
-
-package goid
-
-import "testing"
-
-// TestNothing exists to make the build system happy.
-func TestNothing(t *testing.T) {}
diff --git a/pkg/goid/goid.go b/pkg/goid/goid.go
index 39df30031..17c384cb0 100644
--- a/pkg/goid/goid.go
+++ b/pkg/goid/goid.go
@@ -12,13 +12,61 @@
// See the License for the specific language governing permissions and
// limitations under the License.
-// +build !race
+// +build go1.12
+// +build !go1.17
-// Package goid provides access to the ID of the current goroutine in
-// race/gotsan builds.
+// Check type signatures when updating Go version.
+
+// Package goid provides the Get function.
package goid
// Get returns the ID of the current goroutine.
func Get() int64 {
- panic("unimplemented for non-race builds")
+ return getg().goid
+}
+
+// Structs from Go runtime. These may change in the future and require
+// updating. These structs are currently the same on both AMD64 and ARM64,
+// but may diverge in the future.
+
+type stack struct {
+ lo uintptr
+ hi uintptr
+}
+
+type gobuf struct {
+ sp uintptr
+ pc uintptr
+ g uintptr
+ ctxt uintptr
+ ret uint64
+ lr uintptr
+ bp uintptr
}
+
+type g struct {
+ stack stack
+ stackguard0 uintptr
+ stackguard1 uintptr
+
+ _panic uintptr
+ _defer uintptr
+ m uintptr
+ sched gobuf
+ syscallsp uintptr
+ syscallpc uintptr
+ stktopsp uintptr
+ param uintptr
+ atomicstatus uint32
+ stackLock uint32
+ goid int64
+
+ // More fields...
+ //
+ // We only use goid and the fields before it are only listed to
+ // calculate the correct offset.
+}
+
+// Defined in assembly. This can't use go:linkname since runtime.getg() isn't a
+// real function, it's a compiler intrinsic.
+func getg() *g
diff --git a/pkg/goid/goid_race.go b/pkg/goid/goid_race.go
deleted file mode 100644
index 1766beaee..000000000
--- a/pkg/goid/goid_race.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2020 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.
-
-// Only available in race/gotsan builds.
-// +build race
-
-// Package goid provides access to the ID of the current goroutine in
-// race/gotsan builds.
-package goid
-
-// Get returns the ID of the current goroutine.
-func Get() int64 {
- return goid()
-}
diff --git a/pkg/goid/goid_test.go b/pkg/goid/goid_test.go
index 31970ce79..54be11d63 100644
--- a/pkg/goid/goid_test.go
+++ b/pkg/goid/goid_test.go
@@ -12,63 +12,70 @@
// See the License for the specific language governing permissions and
// limitations under the License.
-// +build race
-
package goid
import (
"runtime"
"sync"
"testing"
+ "time"
)
-func TestInitialGoID(t *testing.T) {
- const max = 10000
- if id := goid(); id < 0 || id > max {
- t.Errorf("got goid = %d, want 0 < goid <= %d", id, max)
- }
-}
+func TestUniquenessAndConsistency(t *testing.T) {
+ const (
+ numGoroutines = 5000
-// TestGoIDSquence verifies that goid returns values which could plausibly be
-// goroutine IDs. If this test breaks or becomes flaky, the structs in
-// goid_unsafe.go may need to be updated.
-func TestGoIDSquence(t *testing.T) {
- // Goroutine IDs are cached by each P.
- runtime.GOMAXPROCS(1)
+ // maxID is not an intrinsic property of goroutine IDs; it is only a
+ // property of how the Go runtime currently assigns them. Future
+ // changes to the Go runtime may require that maxID be raised, or that
+ // assertions regarding it be removed entirely.
+ maxID = numGoroutines + 1000
+ )
- // Fill any holes in lower range.
- for i := 0; i < 50; i++ {
- var wg sync.WaitGroup
- wg.Add(1)
+ var (
+ goidsMu sync.Mutex
+ goids = make(map[int64]struct{})
+ checkedWG sync.WaitGroup
+ exitCh = make(chan struct{})
+ )
+ for i := 0; i < numGoroutines; i++ {
+ checkedWG.Add(1)
go func() {
- wg.Done()
-
- // Leak the goroutine to prevent the ID from being
- // reused.
- select {}
- }()
- wg.Wait()
- }
-
- id := goid()
- for i := 0; i < 100; i++ {
- var (
- newID int64
- wg sync.WaitGroup
- )
- wg.Add(1)
- go func() {
- newID = goid()
- wg.Done()
-
- // Leak the goroutine to prevent the ID from being
- // reused.
- select {}
+ id := Get()
+ if id > maxID {
+ t.Errorf("observed unexpectedly large goroutine ID %d", id)
+ }
+ goidsMu.Lock()
+ if _, dup := goids[id]; dup {
+ t.Errorf("observed duplicate goroutine ID %d", id)
+ }
+ goids[id] = struct{}{}
+ goidsMu.Unlock()
+ checkedWG.Done()
+ for {
+ if curID := Get(); curID != id {
+ t.Errorf("goroutine ID changed from %d to %d", id, curID)
+ // Don't spam logs by repeating the check; wait quietly for
+ // the test to finish.
+ <-exitCh
+ return
+ }
+ // Check if the test is over.
+ select {
+ case <-exitCh:
+ return
+ default:
+ }
+ // Yield to other goroutines, and possibly migrate to another P.
+ runtime.Gosched()
+ }
}()
- wg.Wait()
- if max := id + 100; newID <= id || newID > max {
- t.Errorf("unexpected goroutine ID pattern, got goid = %d, want %d < goid <= %d (previous = %d)", newID, id, max, id)
- }
- id = newID
}
+ // Wait for all goroutines to perform uniqueness checks.
+ checkedWG.Wait()
+ // Wait for an additional second to allow goroutines to spin checking for
+ // ID consistency.
+ time.Sleep(time.Second)
+ // Request that all goroutines exit.
+ close(exitCh)
}
diff --git a/pkg/goid/goid_unsafe.go b/pkg/goid/goid_unsafe.go
deleted file mode 100644
index ded8004dd..000000000
--- a/pkg/goid/goid_unsafe.go
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright 2020 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 goid
-
-// Structs from Go runtime. These may change in the future and require
-// updating. These structs are currently the same on both AMD64 and ARM64,
-// but may diverge in the future.
-
-type stack struct {
- lo uintptr
- hi uintptr
-}
-
-type gobuf struct {
- sp uintptr
- pc uintptr
- g uintptr
- ctxt uintptr
- ret uint64
- lr uintptr
- bp uintptr
-}
-
-type g struct {
- stack stack
- stackguard0 uintptr
- stackguard1 uintptr
-
- _panic uintptr
- _defer uintptr
- m uintptr
- sched gobuf
- syscallsp uintptr
- syscallpc uintptr
- stktopsp uintptr
- param uintptr
- atomicstatus uint32
- stackLock uint32
- goid int64
-
- // More fields...
- //
- // We only use goid and the fields before it are only listed to
- // calculate the correct offset.
-}
-
-func getg() *g
-
-// goid returns the ID of the current goroutine.
-func goid() int64 {
- return getg().goid
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 18:34:29 +0000