31 lines
1.2 KiB
YAML
31 lines
1.2 KiB
YAML
define: DUK_OPT_EXEC_TIMEOUT_CHECK
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introduced: 1.2.0
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requires:
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- DUK_OPT_INTERRUPT_COUNTER
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tags:
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- execution
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- sandbox
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- experimental
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description: >
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NOTE: This mechanism is EXPERIMENTAL and the details may change
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between releases.
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Provide a hook to check for bytecode execution timeout. The macro gets
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a void ptr userdata argument (the userdata given to duk_heap_create())
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and must evaluate to a duk_bool_t. Duktape calls the macro as:
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"if (DUK_OPT_EXEC_TIMEOUT_CHECK(udata)) { ... }".
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The macro is called occasionally by the Duktape bytecode executor (i.e.
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when executing ECMAScript code), typically from a few times per second
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to a hundred times per second, but the interval varies a great deal
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depending on what kind of code is being executed.
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To indicate an execution timeout, the macro must return a non-zero value.
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When that happens, Duktape starts to bubble a ``RangeError`` outwards
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until control has been returned to the original protected call made by
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the application. Until that happens, the exec timeout macro must always
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return non-zero to indicate an execution timeout is still in progress.
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This mechanism and its limitations is described in more detail in
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doc/sandboxing.rst.
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