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Use atomic_flag_test_and_set to ensure that FTL_TCP_worker_terminating() cannot run two times even when called exactly at the same time.

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Signed-off-by: DL6ER <dl6er@dl6er.de>
This commit is contained in:
DL6ER
2020-07-18 21:27:47 +02:00
parent de8c633009
commit b338fa78fb
1 changed files with 4 additions and 3 deletions
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src/dnsmasq_interface.c
+4 -3
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@@ -38,6 +38,8 @@
#include "args.h"
// handle_realtime_signals()
#include "signals.h"
// atomic_flag_test_and_set()
#include <stdatomic.h>
static void print_flags(const unsigned int flags);
static void save_reply_type(const unsigned int flags, const union all_addr *addr,
@@ -1785,15 +1787,14 @@ static void prepare_blocking_metadata(void)
// Called when a (forked) TCP worker is terminated by receiving SIGALRM
// We close the dedicated database connection this client had opened
// to avoid dangling database locks
static volatile bool worker_already_terminating = false;
volatile atomic_flag worker_already_terminating = ATOMIC_FLAG_INIT;
void FTL_TCP_worker_terminating(bool finished)
{
if(worker_already_terminating)
if(atomic_flag_test_and_set(&worker_already_terminating))
{
logg("TCP worker already terminating!");
return;
}
worker_already_terminating = true;
// Possible debug logging
if(config.debug != 0)