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Fix status table race condition (#1835)

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This commit is contained in:
Ethan Koenig
2017-05-31 04:57:17 -04:00
committed by Lunny Xiao
parent 0f5b399e35
commit bfb44f8854
5 changed files with 26 additions and 10 deletions
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12
modules/sync/status_pool.go
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@@ -24,6 +24,18 @@ func NewStatusTable() *StatusTable {
}
}
// StartIfNotRunning sets value of given name to true if not already in pool.
// Returns whether set value was set to true
func (p *StatusTable) StartIfNotRunning(name string) bool {
p.lock.Lock()
_, ok := p.pool[name]
if !ok {
p.pool[name] = struct{}{}
}
p.lock.Unlock()
return !ok
}
// Start sets value of given name to true in the pool.
func (p *StatusTable) Start(name string) {
p.lock.Lock()

9
modules/sync/status_pool_test.go
View File

@@ -18,6 +18,15 @@ func Test_StatusTable(t *testing.T) {
table.Start("xyz")
assert.True(t, table.IsRunning("xyz"))
assert.False(t, table.StartIfNotRunning("xyz"))
assert.True(t, table.IsRunning("xyz"))
table.Stop("xyz")
assert.False(t, table.IsRunning("xyz"))
assert.True(t, table.StartIfNotRunning("xyz"))
assert.True(t, table.IsRunning("xyz"))
table.Stop("xyz")
assert.False(t, table.IsRunning("xyz"))
}