logging: Fix print tid value in multithreadded programs

Change-Id: I363751ab1368d916aad8905b056ec4f9d62b7175
---
M src/core/logging.c
1 file changed, 9 insertions(+), 3 deletions(-)


git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/85/42085/1

diff --git a/src/core/logging.c b/src/core/logging.c
index db5433e..acfdf3c 100644
--- a/src/core/logging.c
+++ b/src/core/logging.c
@@ -606,9 +606,15 @@
 			OSMO_STRBUF_PRINTF(sb, " ");
 		}
 		if (target->print_tid) {
-			if (log_thread_state.tid == 0)
-				log_thread_state.tid = (long int)osmo_gettid();
-			OSMO_STRBUF_PRINTF(sb, "%ld ", log_thread_state.tid);
+			long int tid;
+			if (!osmo_log_tgt_mutex_on) {
+				tid = log_thread_state.tid;
+				if (OSMO_UNLIKELY(tid == 0))
+					tid = log_thread_state.tid = (long int)osmo_gettid();
+			} else {
+				tid = (long int)osmo_gettid();
+			}
+			OSMO_STRBUF_PRINTF(sb, "%ld ", tid);
 		}
 		if (target->print_category)
 			OSMO_STRBUF_PRINTF(sb, "%s%s%s%s ",

