/* _longjmp_unwind -- Clean up stack frames unwound by longjmp. Hurd version.
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#error "<jmpbuf-unwind.h> fails to define _JMPBUF_UNWINDS"
static inline uintptr_t
demangle_ptr (uintptr_t x)
# ifdef PTR_DEMANGLE
/* This function is called by `longjmp' (with its arguments) to restore
active resources to a sane state before the frames code using them are
jumped out of. */
_longjmp_unwind (jmp_buf env, int val)
struct hurd_sigstate *ss = _hurd_self_sigstate ();
struct hurd_userlink *link;
/* All access to SS->active_resources must take place inside a critical
section where signal handlers cannot run. */
/* Remove local signal preemptors being unwound past. */
while (ss->preemptors &&
_JMPBUF_UNWINDS (env.__jmpbuf, ss->preemptors, demangle_ptr))
ss->preemptors = ss->preemptors->next;
/* Iterate over the current thread's list of active resources.
Process the head portion of the list whose links reside
in stack frames being unwound by this jump. */
for (link = ss->active_resources;
link && _JMPBUF_UNWINDS (env.__jmpbuf, link, demangle_ptr);
link = link->thread.next)
/* Remove this link from the resource's users list,
since the frame using the resource is being unwound.
This call returns nonzero if that was the last user. */
if (_hurd_userlink_unlink (link))
/* One of the frames being unwound by the longjmp was the last user
of its resource. Call the cleanup function to deallocate it. */
(*link->cleanup) (link->cleanup_data, env, val);