1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/pthread/tst-pthread-raise-blocked-self.c b/sysdeps/pthread/tst-pthread-raise-blocked-self.c
new file mode 100644
index 0000000000..128e1a6071
--- /dev/null
+++ b/sysdeps/pthread/tst-pthread-raise-blocked-self.c
@@ -0,0 +1,92 @@
+/* Test that raise sends signal to current thread even if blocked.
+   Copyright (C) 2021 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; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <signal.h>
+#include <support/check.h>
+#include <support/xsignal.h>
+#include <support/xthread.h>
+#include <pthread.h>
+#include <unistd.h>
+
+/* Used to create a dummy thread ID distinct from all other thread
+   IDs.  */
+static void *
+noop (void *ignored)
+{
+  return NULL;
+}
+
+static volatile pthread_t signal_thread;
+
+static void
+signal_handler (int signo)
+{
+  signal_thread = pthread_self ();
+}
+
+/* Used to ensure that waiting_thread has launched and can accept
+   signals.  */
+static pthread_barrier_t barrier;
+
+static void *
+waiting_thread (void *ignored)
+{
+  xpthread_barrier_wait (&barrier);
+  pause ();
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  xsignal (SIGUSR1, signal_handler);
+  xpthread_barrier_init (&barrier, NULL, 2);
+
+  /* Distinct thread ID value to */
+  pthread_t dummy = xpthread_create (NULL, noop, NULL);
+  signal_thread = dummy;
+
+  pthread_t helper = xpthread_create (NULL, waiting_thread, NULL);
+
+  /* Make sure that the thread is running.  */
+  xpthread_barrier_wait (&barrier);
+
+  /* Block signals on this thread.  */
+  sigset_t set;
+  sigfillset (&set);
+  xpthread_sigmask (SIG_BLOCK, &set, NULL);
+
+  /* Send the signal to this thread.  It must not be delivered.  */
+  raise (SIGUSR1);
+  TEST_VERIFY (signal_thread == dummy);
+
+  /* Wait a bit to give a chance for signal delivery (increases
+     chances of failure with bug 28407).  */
+  usleep (50 * 1000);
+
+  /* Unblocking should cause synchronous delivery of the signal.  */
+  xpthread_sigmask (SIG_UNBLOCK, &set, NULL);
+  TEST_VERIFY (signal_thread == pthread_self ());
+
+  xpthread_cancel (helper);
+  xpthread_join (helper);
+  xpthread_join (dummy);
+  return 0;
+}
+
+#include <support/test-driver.c>