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debug_sync: Print all current active signals within the trace file during wait

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When running with DBUG trace enabled, print all current active signals.

The output looks like this with the signals present in curr:
T@6 ... debug_sync_exec: wait for 'nothing'  at: 'now', curr: 'something,from_function,from_myvar'
This commit is contained in:
Vicențiu Ciorbaru 2023-02-03 15:00:49 +02:00
parent 2a08b2c15c
commit 9f16d15357
1 changed files with 50 additions and 5 deletions
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55
sql/debug_sync.cc
View file

@ -18,6 +18,7 @@
#include "mariadb.h"
#include "debug_sync.h"
#include <cstring>
#if defined(ENABLED_DEBUG_SYNC)
@ -351,6 +352,40 @@ void debug_sync_init_thread(THD *thd)
}
/**
Returns an allocated buffer containing a comma-separated C string of all
active signals.
Buffer must be freed by the caller.
*/
static const char *get_signal_set_as_string()
{
mysql_mutex_assert_owner(&debug_sync_global.ds_mutex);
size_t req_size= 1; // In case of empty set for the end '\0' char.
for (size_t i= 0; i < debug_sync_global.ds_signal_set.size(); i++)
req_size+= debug_sync_global.ds_signal_set.at(i)->length + 1;
char *buf= (char *) my_malloc(PSI_NOT_INSTRUMENTED, req_size, MYF(0));
if (!buf)
return nullptr;
memset(buf, '\0', req_size);
char *cur_pos= buf;
for (size_t i= 0; i < debug_sync_global.ds_signal_set.size(); i++)
{
const LEX_CSTRING *signal= debug_sync_global.ds_signal_set.at(i);
memcpy(cur_pos, signal->str, signal->length);
if (i != debug_sync_global.ds_signal_set.size() - 1)
cur_pos[signal->length]= ',';
else
cur_pos[signal->length] = '\0';
cur_pos+= signal->length + 1;
}
return buf;
}
/**
End the debug sync facility at thread end.
@ -1581,12 +1616,22 @@ static void debug_sync_execute(THD *thd, st_debug_sync_action *action)
restore_current_mutex = false;
set_timespec(abstime, action->timeout);
// TODO turn this into a for loop printing.
DBUG_EXECUTE("debug_sync_exec", {
/* Functions as DBUG_PRINT args can change keyword and line nr. */
DBUG_PRINT("debug_sync_exec",
("wait for '%s' at: '%s'",
sig_wait, dsp_name));});
const char *signal_set= get_signal_set_as_string();
if (!signal_set)
{
DBUG_PRINT("debug_sync_exec",
("Out of memory when fetching signal set"));
}
else
{
/* Functions as DBUG_PRINT args can change keyword and line nr. */
DBUG_PRINT("debug_sync_exec",
("wait for '%s' at: '%s', curr: '%s'",
sig_wait, dsp_name, signal_set));
my_free((void *)signal_set);
}});
/*
Wait until global signal string matches the wait_for string.