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Improve stack overflow recovery
It's now possible to use sigaltstack() to recover from stack overflows on Windows. Several bugs in sigaltstack() have been fixed, for all our supported platforms. There's a newer better example showing how to use this, along with three independent unit tests just to further showcase the various techniques.
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#include "libc/intrin/likely.h"
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#include "libc/runtime/runtime.h"
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#define _NTTRACE 1 /* not configurable w/ flag yet */
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#define _NTTRACE 0 /* not configurable w/ flag yet */
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#define _POLLTRACE 0 /* not configurable w/ flag yet */
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#define _DATATRACE 1 /* not configurable w/ flag yet */
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#define _LOCKTRACE 0 /* not configurable w/ flag yet */
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