Adding new fields into class task_prefix

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Adding new fields into class task_prefix

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Hello~

I am trying to add some variables into the task_prefix class.

According to the comment in the task.h, fields are ordered in way that preserves backwards compatibility and yields good packing on typical 32-bit and 64-bit platforms.

I have already added one integer variable and found nothing wrong.

However, after adding another boolean variable, the small program I write crashes due to the segmentation fault.

Could anyone tell me how to add variable into task_prefix class safely?

Dennis

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