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/* Copyright 2008,2018
Free Software Foundation, Inc.
This file is part of Guile.
Guile is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Guile is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Guile. If not, see
<https://www.gnu.org/licenses/>. */
/* Test whether `scm_with_guile ()' can be called several times from a given
thread, but from a different stack depth. Up to 1.8.5, `scm_with_guile
()' would not update the thread's `base' field, which would then confuse
the GC.
See http://lists.gnu.org/archive/html/guile-devel/2008-11/msg00037.html
for a detailed report. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <libguile.h>
static void *
entry_point (void *arg)
{
/* Invoke the GC. If `THREAD->base' is incorrect, then Guile will just
segfault somewhere in `scm_mark_locations ()'. */
scm_gc ();
return NULL;
}
static void
go_deeper_into_the_stack (unsigned level)
{
/* The assumption is that the compiler is not smart enough to optimize this
out. */
if (level > 0)
go_deeper_into_the_stack (level - 1);
else
scm_with_guile (entry_point, NULL);
}
int
main (int argc, char *argv[])
{
/* Invoke `scm_with_guile ()' from someplace deep into the stack. */
go_deeper_into_the_stack (100);
/* Invoke it from much higher into the stack. This time, Guile is expected
to update the `base' field of the current thread. */
scm_with_guile (entry_point, NULL);
return 0;
}
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