libgo/go/runtime/lockrank_test.go

   1 // Copyright 2021 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package runtime_test
   6
   7 import (
   8         . "runtime"
   9         "testing"
  10 )
  11
  12 // Check that the partial order in lockPartialOrder fits within the total order
  13 // determined by the order of the lockRank constants.
  14 func TestLockRankPartialOrder(t *testing.T) {
  15         for r, list := range LockPartialOrder {
  16                 rank := LockRank(r)
  17                 for _, e := range list {
  18                         entry := LockRank(e)
  19                         if entry > rank {
  20                                 t.Errorf("lockPartialOrder row %v entry %v is inconsistent with total lock ranking order", rank, entry)
  21                         }
  22                 }
  23         }
  24 }
  25
  26 // Verify that partial order lists are kept sorted. This is a purely cosemetic
  27 // check to make manual reviews simpler. It does not affect correctness, unlike
  28 // the above test.
  29 func TestLockRankPartialOrderSortedEntries(t *testing.T) {
  30         for r, list := range LockPartialOrder {
  31                 rank := LockRank(r)
  32                 var prev LockRank
  33                 for _, e := range list {
  34                         entry := LockRank(e)
  35                         if entry <= prev {
  36                                 t.Errorf("Partial order for rank %v out of order: %v <= %v in %v", rank, entry, prev, list)
  37                         }
  38                         prev = entry
  39                 }
  40         }
  41 }