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BUG/MEDIUM: debug: make the debug_handler check for the thread in threads_to_dump

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It happens that just sending the debug signal to the process makes on
thread wait for its turn while nobody wants to dump. We need to at
least verify that a dump was really requested for this thread.

This can be backported to 2.1 and 2.0.
This commit is contained in:
Willy Tarreau 2020-03-03 08:31:34 +01:00
parent 516853f1cc
commit 82aafc4a0f
1 changed files with 6 additions and 0 deletions
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6
src/debug.c
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@ -645,6 +645,12 @@ void ha_thread_dump_all_to_trash()
/* handles DEBUGSIG to dump the state of the thread it's working on */
void debug_handler(int sig, siginfo_t *si, void *arg)
{
/* first, let's check it's really for us and that we didn't just get
* a spurious DEBUGSIG.
*/
if (!(threads_to_dump & tid_bit))
return;
/* There are 4 phases in the dump process:
* 1- wait for our turn, i.e. when all lower bits are gone.
* 2- perform the action if our bit is set