[PATCH i-g-t v2 1/1] lib/igt_core: flush output on each line

[Jan Sokolowski <jan.sokolowski@intel.com>]

It was found while running tests that if a test launches threads with
even more subthreads, some igt_debug calls might not print their lines.

Fflush after each line to make sure we see everything we want to see.

Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
---

v2: Only flushes if no runner is connected as it's not needed otherwise.

---
 lib/igt_core.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/igt_core.c b/lib/igt_core.c
index 65325f08d4..4479201972 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -3294,10 +3294,8 @@ void igt_vlog(const char *domain, enum igt_log_level level, const char *format,
 	pthread_mutex_lock(&print_mutex);
 
 	/* use stderr for warning messages and above */
-	if (level >= IGT_LOG_WARN) {
+	if (level >= IGT_LOG_WARN)
 		file = stderr;
-		fflush(stdout);
-	}
 	else
 		file = stdout;
 
@@ -3309,6 +3307,13 @@ void igt_vlog(const char *domain, enum igt_log_level level, const char *format,
 		_log_line_fprintf(file, "%s%s", thread_id, line);
 	}
 
+	/* Ensure output is flushed explicitly, as concurrent test threads
+	 * may otherwise cause messages to be dropped or reordered.
+	 * Runner uses sockets so it's not needed there.
+	 */
+	if (!runner_connected())
+		fflush(file);
+
 	pthread_mutex_unlock(&print_mutex);
 
 out:
-- 
2.43.0