The runtime needs to be able to put a pointer into thread-local storage. The runtime needs to be able to put a pointer into thread-local storage. Access to a single thread-local pointer.
The runtime will use this for storing ~Task.
XXX: Add runtime checks for usage of inconsistent pointer types. and for overwriting an existing pointer.
| borrow | Borrow the thread-local value from thread-local storage. While the value is borrowed it is not available in TLS. |
| exists | Check whether there is a thread-local pointer installed. |
| init_tls_key | Initialize the TLS key. Other ops will fail if this isn't executed first. |
| maybe_tls_key | |
| put | Give a pointer to thread-local storage. |
| take | Take ownership of a pointer from thread-local storage. |
| try_unsafe_borrow | |
| unsafe_borrow | Borrow a mutable reference to the thread-local value |
| unsafe_take | Take ownership of a pointer from thread-local storage. |
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