From 81b80b9610798ea910daad78cf525dec211639f9 Mon Sep 17 00:00:00 2001 From: Andy Wingo Date: Thu, 23 Feb 2012 14:18:56 +0100 Subject: Revert "with a threaded guile, lock weak sets and tables during a fork" This reverts commit f609480611cfd1585409fd6b1b90beb730b026cf. --- libguile/weak-table.c | 108 +++++++------------------------------------------- 1 file changed, 14 insertions(+), 94 deletions(-) (limited to 'libguile/weak-table.c') 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], ©); - 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], ©); - 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 -- cgit v1.2.3