Deflake TestSIGALRMToMainThread.

Bump up the threshold on number of SIGALRMs received by worker
threads from 50 to 200. Even with the new threshold we still
expect that the majority of SIGALRMs are received by the
thread group leader.

PiperOrigin-RevId: 254289787

1 files changed, 6 insertions, 1 deletions

diff --git a/test/syscalls/linux/itimer.cc b/test/syscalls/linux/itimer.cc
index 57ffd1595..51ce323b9 100644
--- a/test/syscalls/linux/itimer.cc
+++ b/test/syscalls/linux/itimer.cc
@@ -197,12 +197,17 @@ int TestSIGALRMToMainThread() {
   // (but don't guarantee it), so we expect to see most samples on the main
   // thread.
   //
+  // The number of SIGALRMs delivered to a worker should not exceed 20%
+  // of the number of total signals expected (this is somewhat arbitrary).
+  const int worker_threshold = result.expected_total / 5;
+
+  //
   // Linux only guarantees timers will never expire before the requested time.
   // Thus, we only check the upper bound and also it at least have one sample.
   TEST_CHECK(result.main_thread_samples <= result.expected_total);
   TEST_CHECK(result.main_thread_samples > 0);
   for (int num : result.worker_samples) {
-    TEST_CHECK_MSG(num <= 50, "worker received too many samples");
+    TEST_CHECK_MSG(num <= worker_threshold, "worker received too many samples");
   }
 
   return 0;