1 files changed, 79 insertions, 0 deletions
diff --git a/rt/tst-timer6.c b/rt/tst-timer6.c
new file mode 100644
index 0000000000..d0f3b030b6
--- /dev/null
+++ b/rt/tst-timer6.c
@@ -0,0 +1,79 @@
+/* Check re-use timer id for SIGEV_THREAD (BZ 32833)
+   Copyright (C) 2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
+
+#include <signal.h>
+#include <time.h>
+#include <support/check.h>
+
+/* The test depends of the system load and scheduler pressure, so the
+   number of iteration is arbitrary to not take too much time.  */
+enum { niters = 1<<13 };
+
+static void
+on_good_timer (union sigval sv)
+{
+}
+
+static void
+on_bad_timer (union sigval sv)
+{
+  FAIL_EXIT1 ("triggered bad timer");
+}
+
+static int
+do_test (void)
+{
+  struct itimerspec its_long =  {. it_value = { .tv_sec = 180 } };
+  struct itimerspec its_short = { .it_value = { .tv_nsec = 1000 } };
+  struct itimerspec its_zero =  { .it_interval = { .tv_sec = 0} };
+
+  struct sigevent ev_short =
+    {
+      .sigev_notify = SIGEV_THREAD,
+      .sigev_notify_function = on_good_timer,
+    };
+
+  struct sigevent ev_long =
+    {
+      .sigev_notify = SIGEV_THREAD,
+      .sigev_notify_function = on_bad_timer,
+    };
+
+  for (int which = 0; which < niters; which++)
+    {
+      struct sigevent * ev = which & 0x1 ? &ev_short : &ev_long;
+      struct itimerspec * its = which & 0x1? &its_short : &its_long;
+
+      timer_t timerid;
+      if (timer_create (CLOCK_REALTIME, ev, &timerid) == -1)
+	FAIL_EXIT1 ("timer_create: %m");
+
+      if (timer_settime (timerid, 0, its, NULL) == -1)
+	FAIL_EXIT1 ("timer_settime: %m");
+
+      if (timer_settime (timerid, 0, &its_zero, NULL) == -1)
+	FAIL_EXIT1 ("timer_settime: %m");
+
+      if (timer_delete (timerid) == -1)
+	FAIL_EXIT1 ("time_delete: %m");
+    }
+
+  return 0;
+}
+
+#include <support/test-driver.c>