c33d9e31cc
In the multithreaded evaluator, it's possible for multiple threads to wait on the same thunk. If evaluation of the thunk results in an exception, the waiting threads shouldn't try to re-force the thunk. Instead, they should rethrow the same exception, without duplicating any work. Therefore, there is now a new value type `tFailed` that stores an std::exception_ptr. If evaluation of a thunk/app results in an exception, `forceValue()` overwrites the value with a `tFailed`. If `forceValue()` encounters a `tFailed`, it rethrows the exception. So you normally never need to check for failed values (since forcing them causes a rethrow). Co-authored-by: Robert Hensing <robert@roberthensing.nl>
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16 B
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2 lines
16 B
Plaintext
trace: throwing
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