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mdl_dbug_print_locks(): make it useful in gdb too

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This commit is contained in:
Sergei Golubchik 2021-05-03 23:31:33 +02:00
parent b81803f065
commit 7e9bc7bf4e
2 changed files with 32 additions and 37 deletions
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64
sql/mdl.cc
View file

@ -224,6 +224,35 @@ private:
static const uint MAX_SEARCH_DEPTH= 32;
};
#ifndef DBUG_OFF
/*
Print a list of all locks to DBUG trace to help with debugging
*/
static int mdl_dbug_print_lock(MDL_ticket *mdl_ticket, void *arg, bool granted)
{
String *tmp= (String*) arg;
char buffer[128];
MDL_key *mdl_key= mdl_ticket->get_key();
size_t length;
length= my_snprintf(buffer, sizeof(buffer)-1,
"\nname: %s db: %.*s key_name: %.*s (%s)",
mdl_ticket->get_type_name()->str,
(int) mdl_key->db_name_length(), mdl_key->db_name(),
(int) mdl_key->name_length(), mdl_key->name(),
granted ? "granted" : "waiting");
tmp->append(buffer, length);
return 0;
}
const char *mdl_dbug_print_locks()
{
static String tmp;
mdl_iterate(mdl_dbug_print_lock, (void*) &tmp);
return tmp.c_ptr();
}
#endif /* DBUG_OFF */
/**
Enter a node of a wait-for graph. After
@ -2358,7 +2387,9 @@ MDL_context::acquire_lock(MDL_request *mdl_request, double lock_wait_timeout)
switch (wait_status)
{
case MDL_wait::VICTIM:
mdl_dbug_print_locks();
DBUG_LOCK_FILE;
DBUG_PRINT("mdl_locks", ("%s", mdl_dbug_print_locks()));
DBUG_UNLOCK_FILE;
my_error(ER_LOCK_DEADLOCK, MYF(0));
break;
case MDL_wait::TIMEOUT:
@ -3241,34 +3272,3 @@ void MDL_ticket::wsrep_report(bool debug)
psi_stage->m_name);
}
#endif /* WITH_WSREP */
#ifndef DBUG_OFF
/*
Print a list of all locks to DBUG trace to help with debugging
*/
static int mdl_dbug_print_lock(MDL_ticket *mdl_ticket, void *arg, bool granted)
{
String *tmp= (String*) arg;
char buffer[128];
MDL_key *mdl_key= mdl_ticket->get_key();
size_t length;
length= my_snprintf(buffer, sizeof(buffer)-1,
"\nname: %s db: %.*s key_name: %.*s (%s)",
mdl_ticket->get_type_name()->str,
(int) mdl_key->db_name_length(), mdl_key->db_name(),
(int) mdl_key->name_length(), mdl_key->name(),
granted ? "granted" : "waiting");
tmp->append(buffer, length);
return 0;
}
void mdl_dbug_print_locks()
{
String tmp;
mdl_iterate(mdl_dbug_print_lock, (void*) &tmp);
DBUG_PRINT("mdl_locks", ("%s", tmp.c_ptr()));
}
#endif /* DBUG_OFF */

5
sql/mdl.h
View file

@ -1106,9 +1106,4 @@ typedef int (*mdl_iterator_callback)(MDL_ticket *ticket, void *arg,
bool granted);
extern MYSQL_PLUGIN_IMPORT
int mdl_iterate(mdl_iterator_callback callback, void *arg);
#ifndef DBUG_OFF
void mdl_dbug_print_locks();
#else
static inline void mdl_dbug_print_locks() {}
#endif /* DBUG_OFF */
#endif /* MDL_H */