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authorAndy Wingo <wingo@pobox.com>2012-02-23 14:18:56 +0100
committerAndy Wingo <wingo@pobox.com>2012-02-23 14:18:56 +0100
commit81b80b9610798ea910daad78cf525dec211639f9 (patch)
tree4a1ecf3f8e70132c133f54acc2413b2547cf0931 /libguile/weak-table.c
parent44b76a785ce075df07e6af1c2bf7d5ad3f4e3d4f (diff)
downloadguile-81b80b9610798ea910daad78cf525dec211639f9.tar.gz
Revert "with a threaded guile, lock weak sets and tables during a fork"
This reverts commit f609480611cfd1585409fd6b1b90beb730b026cf.
Diffstat (limited to 'libguile/weak-table.c')
-rw-r--r--libguile/weak-table.c108
1 files changed, 14 insertions, 94 deletions
diff --git a/libguile/weak-table.c b/libguile/weak-table.c
index 49d5b6dc9..7764f5254 100644
--- a/libguile/weak-table.c
+++ b/libguile/weak-table.c
@@ -772,79 +772,10 @@ weak_table_remove_x (scm_t_weak_table *table, unsigned long hash,
-
-static void
-lock_weak_table (scm_t_weak_table *table)
-{
- scm_i_pthread_mutex_lock (&table->lock);
-}
-
-static void
-unlock_weak_table (scm_t_weak_table *table)
-{
- scm_i_pthread_mutex_unlock (&table->lock);
-}
-
-/* A weak table of weak tables, for use in the pthread_atfork handler. */
-static SCM all_weak_tables = SCM_BOOL_F;
-
-#if SCM_USE_PTHREAD_THREADS
-
-static void
-lock_all_weak_tables (void)
-{
- scm_t_weak_table *s;
- scm_t_weak_entry *entries;
- unsigned long k, size;
- scm_t_weak_entry copy;
-
- s = SCM_WEAK_TABLE (all_weak_tables);
- lock_weak_table (s);
- size = s->size;
- entries = s->entries;
-
- for (k = 0; k < size; k++)
- if (entries[k].hash)
- {
- copy_weak_entry (&entries[k], &copy);
- if (copy.key)
- lock_weak_table (SCM_WEAK_TABLE (SCM_PACK (copy.key)));
- }
-}
-
-static void
-unlock_all_weak_tables (void)
-{
- scm_t_weak_table *s;
- scm_t_weak_entry *entries;
- unsigned long k, size;
- scm_t_weak_entry copy;
-
- s = SCM_WEAK_TABLE (all_weak_tables);
- size = s->size;
- entries = s->entries;
-
- for (k = 0; k < size; k++)
- if (entries[k].hash)
- {
- copy_weak_entry (&entries[k], &copy);
- if (copy.key)
- unlock_weak_table (SCM_WEAK_TABLE (SCM_PACK (copy.key)));
- }
-
- unlock_weak_table (s);
-}
-
-#endif /* SCM_USE_PTHREAD_THREADS */
-
-
-
-
static SCM
make_weak_table (unsigned long k, scm_t_weak_table_kind kind)
{
scm_t_weak_table *table;
- SCM ret;
int i = 0, n = k ? k : 31;
while (i + 1 < HASHTABLE_SIZE_N && n > hashtable_size[i])
@@ -862,12 +793,7 @@ make_weak_table (unsigned long k, scm_t_weak_table_kind kind)
table->min_size_index = i;
scm_i_pthread_mutex_init (&table->lock, NULL);
- ret = scm_cell (scm_tc7_weak_table, (scm_t_bits)table);
-
- if (scm_is_true (all_weak_tables))
- scm_weak_table_putq_x (all_weak_tables, ret, SCM_BOOL_T);
-
- return ret;
+ return scm_cell (scm_tc7_weak_table, (scm_t_bits)table);
}
void
@@ -891,7 +817,7 @@ do_vacuum_weak_table (SCM table)
if (scm_i_pthread_mutex_trylock (&t->lock) == 0)
{
vacuum_weak_table (t);
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
}
return;
@@ -978,11 +904,11 @@ scm_c_weak_table_ref (SCM table, unsigned long raw_hash,
t = SCM_WEAK_TABLE (table);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
ret = weak_table_ref (t, raw_hash, pred, closure, dflt);
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
return ret;
}
@@ -1000,11 +926,11 @@ scm_c_weak_table_put_x (SCM table, unsigned long raw_hash,
t = SCM_WEAK_TABLE (table);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
weak_table_put_x (t, raw_hash, pred, closure, key, value);
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
}
#undef FUNC_NAME
@@ -1020,11 +946,11 @@ scm_c_weak_table_remove_x (SCM table, unsigned long raw_hash,
t = SCM_WEAK_TABLE (table);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
weak_table_remove_x (t, raw_hash, pred, closure);
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
}
#undef FUNC_NAME
@@ -1072,12 +998,12 @@ scm_weak_table_clear_x (SCM table)
t = SCM_WEAK_TABLE (table);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
memset (t->entries, 0, sizeof (scm_t_weak_entry) * t->size);
t->n_items = 0;
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
return SCM_UNSPECIFIED;
}
@@ -1093,7 +1019,7 @@ scm_c_weak_table_fold (scm_t_table_fold_fn proc, void *closure,
t = SCM_WEAK_TABLE (table);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
size = t->size;
entries = t->entries;
@@ -1109,16 +1035,16 @@ scm_c_weak_table_fold (scm_t_table_fold_fn proc, void *closure,
if (copy.key && copy.value)
{
/* Release table lock while we call the function. */
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
init = proc (closure,
SCM_PACK (copy.key), SCM_PACK (copy.value),
init);
- lock_weak_table (t);
+ scm_i_pthread_mutex_lock (&t->lock);
}
}
}
- unlock_weak_table (t);
+ scm_i_pthread_mutex_unlock (&t->lock);
return init;
}
@@ -1273,12 +1199,6 @@ scm_weak_table_prehistory (void)
GC_new_kind (GC_new_free_list (),
GC_MAKE_PROC (GC_new_proc (mark_weak_value_table), 0),
0, 0);
-
-#if SCM_USE_PTHREAD_THREADS
- all_weak_tables = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
- pthread_atfork (lock_all_weak_tables, unlock_all_weak_tables,
- unlock_all_weak_tables);
-#endif
}
void