diff options
Diffstat (limited to 'libgo/go/context/context.go')
| -rw-r--r-- | libgo/go/context/context.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libgo/go/context/context.go b/libgo/go/context/context.go index b561968..b3fdb82 100644 --- a/libgo/go/context/context.go +++ b/libgo/go/context/context.go @@ -230,6 +230,9 @@ type CancelFunc func() // Canceling this context releases resources associated with it, so code should // call cancel as soon as the operations running in this Context complete. func WithCancel(parent Context) (ctx Context, cancel CancelFunc) { + if parent == nil { + panic("cannot create context from nil parent") + } c := newCancelCtx(parent) propagateCancel(parent, &c) return &c, func() { c.cancel(true, Canceled) } @@ -425,6 +428,9 @@ func (c *cancelCtx) cancel(removeFromParent bool, err error) { // Canceling this context releases resources associated with it, so code should // call cancel as soon as the operations running in this Context complete. func WithDeadline(parent Context, d time.Time) (Context, CancelFunc) { + if parent == nil { + panic("cannot create context from nil parent") + } if cur, ok := parent.Deadline(); ok && cur.Before(d) { // The current deadline is already sooner than the new one. return WithCancel(parent) @@ -511,6 +517,9 @@ func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) { // struct{}. Alternatively, exported context key variables' static // type should be a pointer or interface. func WithValue(parent Context, key, val interface{}) Context { + if parent == nil { + panic("cannot create context from nil parent") + } if key == nil { panic("nil key") } |