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Add ephemeron-table-clear!; ephemeron key can be immediate

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* libguile/ephemerons.c (scm_make_ephemeron): Relax restriction that key
be a heap object.  It's too annoying otherwise.
(scm_c_ephemeron_table_clear_x):
(scm_ephemeron_table_clear_x): New interface.
* module/ice-9/ephemerons.scm: Expose ephemeron-table-clear!.
* test-suite/tests/ephemerons.test ("ephemerons"): Update tests.
This commit is contained in:
Andy Wingo 2025-05-13 14:55:38 +02:00
parent c35cbd65f1
commit d457aaa57d
4 changed files with 49 additions and 10 deletions
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16
libguile/atomics-internal.h
View file

@ -57,6 +57,12 @@ scm_atomic_ref_pointer (void **loc)
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return (void *) atomic_load (a_loc);
}
static inline void *
scm_atomic_swap_pointer (void **loc, void *new_val)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return (void *) atomic_exchange (a_loc, (uintptr_t) new_val);
}
static inline void
scm_atomic_set_bits (scm_t_bits *loc, scm_t_bits val)
{
@ -141,6 +147,16 @@ scm_atomic_ref_pointer (void **loc)
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline void *
scm_atomic_swap_pointer (void **loc, void *new_val)
{
void *ret;
scm_i_pthread_mutex_lock (&atomics_lock);
ret = *loc;
*loc = new_val;
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline void
scm_atomic_set_bits (scm_t_bits *loc, scm_t_bits val)

28
libguile/ephemerons.c
View file

@ -30,6 +30,7 @@
#include <stdio.h>
#include <unistd.h>
#include "atomics-internal.h"
#include "extensions.h"
#include "gc-internal.h"
#include "gsubr.h"
@ -147,7 +148,6 @@ SCM_DEFINE_STATIC (scm_make_ephemeron, "make-ephemeron", 2, 0, 0,
"as @var{key} and the ephemeron itself are alive.")
#define FUNC_NAME s_scm_make_ephemeron
{
SCM_MAKE_VALIDATE (1, key, HEAP_OBJECT_P);
return PTR2SCM (scm_c_make_ephemeron (key, val));
}
#undef FUNC_NAME
@ -299,6 +299,15 @@ scm_c_ephemeron_table_try_push_x (struct scm_ephemeron_table *et, size_t idx,
return prev;
}
static struct gc_ephemeron*
scm_c_ephemeron_table_clear_x (struct scm_ephemeron_table *et, size_t idx)
{
if (idx >= et->size)
abort();
return scm_atomic_swap_pointer ((void**) &et->contents[idx], NULL);
}
struct scm_ephemeron_table*
scm_c_ephemeron_table_copy (struct scm_ephemeron_table *et)
{
@ -408,6 +417,23 @@ SCM_DEFINE_STATIC (scm_ephemeron_table_try_push_x, "ephemeron-table-try-push!",
}
#undef FUNC_NAME
SCM_DEFINE_STATIC (scm_ephemeron_table_clear_x, "ephemeron-table-clear!",
2, 0, 0, (SCM et, SCM idx),
"Clear the slot @var{idx} of the ephemeron table @var{et} "
"and return its previous value.")
#define FUNC_NAME s_scm_ephemeron_table_clear_x
{
SCM_VALIDATE_EPHEMERON_TABLE (1, et);
SCM_ASSERT_RANGE (2, idx,
scm_to_size_t (idx) < scm_as_ephemeron_table (et)->size);
struct gc_ephemeron *prev =
scm_c_ephemeron_table_clear_x (scm_as_ephemeron_table (et),
scm_to_size_t (idx));
return prev ? PTR2SCM (prev) : SCM_BOOL_F;
}
#undef FUNC_NAME
int
scm_i_print_ephemeron_table (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
{