Add SLEEP(seconds) function, which always returns 0 after the given

number of seconds (which can include microseconds). (Bug #6760)

5 files changed, 29 insertions, 0 deletions

diff --git a/sql/item_create.cc b/sql/item_create.cc
index b7d8d50f9b3..8798bf889fc 100644
--- a/sql/item_create.cc
+++ b/sql/item_create.cc
@@ -354,6 +354,11 @@ Item *create_func_sha(Item* a)
   return new Item_func_sha(a);
 }
 
+Item *create_func_sleep(Item* a)
+{
+  return new Item_func_sleep(a);
+}
+
 Item *create_func_space(Item *a)
 {
   CHARSET_INFO *cs= current_thd->variables.collation_connection;
diff --git a/sql/item_create.h b/sql/item_create.h
index 0a9af144ec0..d757318bfc1 100644
--- a/sql/item_create.h
+++ b/sql/item_create.h
@@ -83,6 +83,7 @@ Item *create_func_sec_to_time(Item* a);
 Item *create_func_sign(Item* a);
 Item *create_func_sin(Item* a);
 Item *create_func_sha(Item* a);
+Item *create_func_sleep(Item* a);
 Item *create_func_soundex(Item* a);
 Item *create_func_space(Item *);
 Item *create_func_sqrt(Item* a);
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 71e0f29ffc7..ef1c85f6120 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -3259,6 +3259,17 @@ void Item_func_benchmark::print(String *str)
   str->append(')');
 }
 
+/* This function is just used to create tests with time gaps */
+
+longlong Item_func_sleep::val_int()
+{
+  DBUG_ASSERT(fixed == 1);
+  double time= args[0]->val_real();
+  my_sleep((ulong)time*1000000L);
+  return 0;
+}
+
+
 #define extra_size sizeof(double)
 
 static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
diff --git a/sql/item_func.h b/sql/item_func.h
index e8db9d70ae7..1f25b762b70 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -874,6 +874,7 @@ public:
   }
 };
 
+
 class Item_func_benchmark :public Item_int_func
 {
   ulong loop_count;
@@ -888,6 +889,16 @@ public:
 };
 
 
+class Item_func_sleep :public Item_int_func
+{
+public:
+  Item_func_sleep(Item *a) :Item_int_func(a) {}
+  const char *func_name() const { return "sleep"; }
+  longlong val_int();
+};
+
+
+
 #ifdef HAVE_DLOPEN
 
 class Item_udf_func :public Item_func
diff --git a/sql/lex.h b/sql/lex.h
index 122e7040c80..7b6d86e327e 100644
--- a/sql/lex.h
+++ b/sql/lex.h
@@ -734,6 +734,7 @@ static SYMBOL sql_functions[] = {
   { "SIN",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_sin)},
   { "SHA",              F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_sha)},
   { "SHA1",             F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_sha)},
+  { "SLEEP",            F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_sleep)},
   { "SOUNDEX",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_soundex)},
   { "SPACE",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_space)},
   { "SQRT",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_sqrt)},