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Revert "testing: add TB.SetGOMAXPROCS function"

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This reverts CL 519235.

Reason for revert: Proposal is still in incoming.

For #62020

Change-Id: Icccb930209f36097f5d930c01eda6b5042bdddc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/573516
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2024-03-21 21:42:52 +00:00 committed by Gopher Robot
parent b5e377cedc
commit 27f41bb153
4 changed files with 2 additions and 149 deletions
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4
api/next/62020.txt
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@ -1,4 +0,0 @@
pkg testing, type TB interface, SetGOMAXPROCS(int) #62020
pkg testing, method (*T) SetGOMAXPROCS(int) #62020
pkg testing, method (*B) SetGOMAXPROCS(int) #62020
pkg testing, method (*F) SetGOMAXPROCS(int) #62020

1
doc/next/6-stdlib/99-minor/testing/62020.md
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@ -1 +0,0 @@
The [`SetGOMAXPROCS`](/pkg/testing#T.SetGOMAXPROCS) method changes GOMAXPROCS for the duration of a single test.

45
src/testing/testing.go
View File

@ -890,7 +890,6 @@ type TB interface {
Logf(format string, args ...any)
Name() string
Setenv(key, value string)
SetGOMAXPROCS(n int)
Skip(args ...any)
SkipNow()
Skipf(format string, args ...any)
@ -918,7 +917,6 @@ var _ TB = (*B)(nil)
type T struct {
common
isEnvSet bool
isGOMAXPROCSSet bool
context *testContext // For running tests and subtests.
}
@ -1308,19 +1306,6 @@ func (c *common) Setenv(key, value string) {
}
}
// SetGOMAXPROCS calls runtime.GOMAXPROCS(n) and uses Cleanup to
// restore the value of GOMAXPROCS after the test.
//
// Because GOMAXPROCS affects the whole process, it cannot be used
// in parallel tests or tests with parallel ancestors.
func (c *common) SetGOMAXPROCS(n int) {
c.checkFuzzFn("SetGOMAXPROCS")
prev := runtime.GOMAXPROCS(n)
c.Cleanup(func() {
runtime.GOMAXPROCS(prev)
})
}
// panicHanding controls the panic handling used by runCleanup.
type panicHandling int
@ -1461,9 +1446,6 @@ func (t *T) Parallel() {
if t.isEnvSet {
panic("testing: t.Parallel called after t.Setenv; cannot set environment variables in parallel tests")
}
if t.isGOMAXPROCSSet {
panic("testing: t.Parallel called after t.SetGOMAXPROCS; cannot set GOMAXPROCS in parallel tests")
}
t.isParallel = true
if t.parent.barrier == nil {
// T.Parallel has no effect when fuzzing.
@ -1545,33 +1527,6 @@ func (t *T) Setenv(key, value string) {
t.common.Setenv(key, value)
}
// SetGOMAXPROCS calls runtime.GOMAXPROCS(n) and uses Cleanup to
// restore the value of GOMAXPROCS after the test.
//
// Because GOMAXPROCS affects the whole process, it cannot be used
// in parallel tests or tests with parallel ancestors.
func (t *T) SetGOMAXPROCS(n int) {
// Non-parallel subtests that have parallel ancestors may still
// run in parallel with other tests: they are only non-parallel
// with respect to the other subtests of the same parent.
// Since SetGOMAXPROCS affects the whole process, we need to disallow it
// if the current test or any parent is parallel.
isParallel := false
for c := &t.common; c != nil; c = c.parent {
if c.isParallel {
isParallel = true
break
}
}
if isParallel {
panic("testing: t.SetGOMAXPROCS called after t.Parallel; cannot set GOMAXPROCS in parallel tests")
}
t.isGOMAXPROCSSet = true
t.common.SetGOMAXPROCS(n)
}
// InternalTest is an internal type but exported because it is cross-package;
// it is part of the implementation of the "go test" command.
type InternalTest struct {

97
src/testing/testing_test.go
View File

@ -13,7 +13,6 @@ import (
"os/exec"
"path/filepath"
"regexp"
"runtime"
"slices"
"strings"
"sync"
@ -259,102 +258,6 @@ func TestSetenvWithParallelGrandParentBeforeSetenv(t *testing.T) {
})
}
func TestSetGOMAXPROCS(t *testing.T) {
if runtime.GOARCH == "wasm" {
t.Skip("not supported on wasm yet")
}
tests := []struct {
name string
newP int
}{
{
name: "overriding value",
newP: 1,
},
}
for _, test := range tests {
p := runtime.GOMAXPROCS(0)
t.Run(test.name, func(t *testing.T) {
t.SetGOMAXPROCS(test.newP + 1)
if runtime.GOMAXPROCS(0) != test.newP+1 {
t.Fatalf("unexpected value after t.SetGOMAXPROCS: got %d, want %d", runtime.GOMAXPROCS(0), test.newP+1)
}
})
if runtime.GOMAXPROCS(0) != p {
t.Fatalf("unexpected value after t.SetGOMAXPROCS cleanup: got %d, want %d", runtime.GOMAXPROCS(0), p)
}
}
}
func TestSetGOMAXPROCSWithParallelAfterSetGOMAXPROCS(t *testing.T) {
if runtime.GOARCH == "wasm" {
t.Skip("not supported on wasm yet")
}
defer func() {
want := "testing: t.Parallel called after t.SetGOMAXPROCS; cannot set GOMAXPROCS in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
p := runtime.GOMAXPROCS(0)
t.SetGOMAXPROCS(p + 1)
t.Parallel()
}
func TestSetGOMAXPROCSWithParallelBeforeSetGOMAXPROCS(t *testing.T) {
if runtime.GOARCH == "wasm" {
t.Skip("not supported on wasm yet")
}
defer func() {
want := "testing: t.SetGOMAXPROCS called after t.Parallel; cannot set GOMAXPROCS in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
t.Parallel()
p := runtime.GOMAXPROCS(0)
t.SetGOMAXPROCS(p + 1)
}
func TestSetGOMAXPROCSWithParallelParentBeforeSetGOMAXPROCS(t *testing.T) {
if runtime.GOARCH == "wasm" {
t.Skip("not supported on wasm yet")
}
t.Parallel()
t.Run("child", func(t *testing.T) {
defer func() {
want := "testing: t.SetGOMAXPROCS called after t.Parallel; cannot set GOMAXPROCS in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
p := runtime.GOMAXPROCS(0)
t.SetGOMAXPROCS(p + 1)
})
}
func TestSetGOMAXPROCSWithParallelGrandParentBeforeSetGOMAXPROCS(t *testing.T) {
if runtime.GOARCH == "wasm" {
t.Skip("not supported on wasm yet")
}
t.Parallel()
t.Run("child", func(t *testing.T) {
t.Run("grand-child", func(t *testing.T) {
defer func() {
want := "testing: t.SetGOMAXPROCS called after t.Parallel; cannot set GOMAXPROCS in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
p := runtime.GOMAXPROCS(0)
t.SetGOMAXPROCS(p + 1)
})
})
}
// testingTrueInInit is part of TestTesting.
var testingTrueInInit = false