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Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 10 |
1 files changed, 10 insertions, 0 deletions
@@ -27669,6 +27669,16 @@ if it is an ordinary value, it is returned; otherwise, if it is a yield object, its stored value is returned and the state is updated with the new yield object's continuation. +The +.code obtain +macro registers a finalizer against the returned function. +The finalizer invokes the function, passing it the symbol +.codn sys:cont-poison , +thereby triggering unwinding in the most recently captured +continuation. Thus, abandoned +.code obtain +blocks are subject to unwinding when they become garbage. + .TP* Notes: These macros provide a simple abstraction for the use of continuations. |