#3583 use write range -+infinity lock to lock a dictionary refs[t:3583]

git-svn-id: file:///svn/toku/tokudb@32119 c7de825b-a66e-492c-adef-691d508d4ae1

src/lock_tree/locktree.c

@@ -1483,10 +1483,6 @@ static int lt_try_acquire_range_read_lock(toku_lock_tree* tree,
                 add 'K' to selfread('txn') and selfwrite('txn').
                 This requires merging.. see below.
     */
-    if (tree->table_is_locked) {
-        r = (txn==tree->table_lock_owner) ? 0 : DB_LOCK_NOTGRANTED;
-        goto cleanup;
-    }
 
     /* if 'K' is dominated by selfwrite('txn') then return success. */
     r = lt_rt_dominates(tree, &query, 
@@ -1546,49 +1542,6 @@ static inline int border_escalation_trivial(toku_lock_tree* tree,
     return r;
 }
 
-static int lt_global_lock(toku_lock_tree* tree, TXNID txn) {
-    int r;
-
-    assert(!tree->table_is_locked);
-    //Create the self write table if it does not exist.
-    //This saves the fact that txn is still locked.
-    toku_range_tree* selfwrite;
-    if ((r = lt_selfwrite(tree, txn, &selfwrite))) 
-        return r;
-
-    //Clear out the borderwrite, selfwrite, selfread, and mainread tables.
-    //The selfread and selfwrite tables also need to free memory.
-    toku_rt_clear(tree->borderwrite);
-    //Errors at this point on are panics.
-
-    uint32_t ranges;
-    r = toku_rt_get_size(selfwrite, &ranges);
-    if ((r = lt_free_contents(tree, selfwrite, FALSE))) {
-        r = lt_panic(tree, r);
-        goto cleanup;
-    }
-
-    toku_range_tree* selfread = toku_lt_ifexist_selfread(tree, txn);
-    if (selfread) {
-        uint32_t size;
-        r = toku_rt_get_size(selfread, &size);
-        assert_zero(r);
-        ranges += size;
-
-        if ((r = lt_free_contents(tree, selfread, FALSE))) {
-            r = lt_panic(tree, r);
-            goto cleanup;
-        }
-    }
-
-    ltm_lock_decr(tree->mgr, ranges);
-    tree->table_lock_owner = txn;
-    tree->table_is_locked  = TRUE;
-    r = 0;
-cleanup:
-    return r;
-}
-
 /*  */
 static inline int escalate_writes_from_border_range(toku_lock_tree* tree, 
                                                     toku_range* border_range) {
@@ -1616,15 +1569,7 @@ static inline int escalate_writes_from_border_range(toku_lock_tree* tree,
     /*
      * Insert border_range into self_write table
      */
-    if (border_range->ends.left->key_payload==toku_lt_neg_infinity &&
-        border_range->ends.right->key_payload==toku_lt_infinity) {
-        //Lock Entire Table
-        if ((r = lt_global_lock(tree, txn))) 
-            goto cleanup;
-    }
-    else {
-        uint32_t i;
-        for (i = 0; i < numfound; i++) {
+    for (uint32_t i = 0; i < numfound; i++) {
         r = toku_rt_delete(self_write, &tree->buf[i]);
         if (r != 0) { 
             r = lt_panic(tree, r); goto cleanup; 
@@ -1641,13 +1586,13 @@ static inline int escalate_writes_from_border_range(toku_lock_tree* tree,
             p_free(tree, tree->buf[i].ends.right);
         }
     }
+    
     //Insert escalated range.
     r = toku_rt_insert(self_write, border_range);
     if (r != 0) { 
         r = lt_panic(tree, r); goto cleanup; 
     }
     ltm_lock_incr(tree->mgr, numfound);
-    }
 
     r = 0;
 cleanup:
@@ -1862,24 +1807,6 @@ static int lt_try_acquire_range_write_lock(toku_lock_tree* tree,
     if (r != 0)
         goto cleanup;
 
-    if (tree->table_is_locked) {
-        r = (txn==tree->table_lock_owner) ? 0 : DB_LOCK_NOTGRANTED;
-        goto cleanup;
-    }
-
-    if (key_left == toku_lt_neg_infinity && key_right == toku_lt_infinity) {
-        // If there are any other writes, we fail.
-        r = lt_check_borderwrite_conflict(tree, txn, &query);
-        if (r != 0)
-            goto cleanup;
-        // If there are any other reads, we fail.
-        r = lt_write_range_conflicts_reads(tree, txn, &query);
-        if (r != 0) 
-            goto cleanup;
-        r = lt_global_lock(tree, txn);
-        if (r != 0)
-            goto cleanup;
-    } else {
     // if query is dominated by selfwrite('txn') then return success
     BOOL dominated;
     r = lt_rt_dominates(tree, &query, toku_lt_ifexist_selfwrite(tree, txn), &dominated);
@@ -1899,8 +1826,6 @@ static int lt_try_acquire_range_write_lock(toku_lock_tree* tree,
     r = consolidate_writes(tree, &to_insert, txn);
     if (r != 0)
         goto cleanup;
-    }
-
 cleanup:
     if (tree)
         lt_postprocess(tree);
@@ -2097,8 +2022,6 @@ static inline int lt_unlock_txn(toku_lock_tree* tree, TXNID txn) {
         if (r != 0) 
             return lt_panic(tree, r);
     }
-    if (tree->table_lock_owner == txn) 
-        tree->table_is_locked = FALSE;
 
     if (selfread || selfwrite) 
         toku_rth_delete(tree->rth, txn);
@@ -2154,7 +2077,6 @@ static inline void lt_clear(toku_lock_tree* tree) {
     toku_rth_clear(tree->txns_to_unlock);
     /* tree->txns_still_locked is already empty, so we do not clear it. */
     ltm_lock_decr(tree->mgr, ranges);
-    tree->table_is_locked = FALSE;
 }
 
 int toku_lt_unlock(toku_lock_tree* tree, TXNID txn) {

src/lock_tree/locktree.h

@@ -116,8 +116,6 @@ struct __toku_lock_tree {
     uint32_t          ref_count;
     /** DICTIONARY_ID associated with the lock tree */
     DICTIONARY_ID      dict_id;
-    TXNID              table_lock_owner;
-    BOOL               table_is_locked;
     OMT                dbs; //The extant dbs using this lock tree.
 };