1 files changed, 75 insertions, 0 deletions
diff --git a/htl/pt-join.c b/htl/pt-join.c
new file mode 100644
index 0000000000..329163d514
--- /dev/null
+++ b/htl/pt-join.c
@@ -0,0 +1,75 @@
+/* Wait for thread termination.
+   Copyright (C) 2000-2018 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stddef.h>
+
+#include <pt-internal.h>
+
+/* Make calling thread wait for termination of thread THREAD.  Return
+   the exit status of the thread in *STATUS.  */
+int
+pthread_join (pthread_t thread, void **status)
+{
+  struct __pthread *pthread;
+  int err = 0;
+
+  /* Lookup the thread structure for THREAD.  */
+  pthread = __pthread_getid (thread);
+  if (pthread == NULL)
+    return ESRCH;
+
+  __pthread_mutex_lock (&pthread->state_lock);
+  pthread_cleanup_push ((void (*)(void *)) __pthread_mutex_unlock,
+			&pthread->state_lock);
+
+  /* Rely on pthread_cond_wait being a cancellation point to make
+     pthread_join one too.  */
+  while (pthread->state == PTHREAD_JOINABLE)
+    __pthread_cond_wait (&pthread->state_cond, &pthread->state_lock);
+
+  pthread_cleanup_pop (0);
+
+  switch (pthread->state)
+    {
+    case PTHREAD_EXITED:
+      /* THREAD has already exited.  Salvage its exit status.  */
+      if (status != NULL)
+	*status = pthread->status;
+
+      __pthread_mutex_unlock (&pthread->state_lock);
+
+      __pthread_dealloc (pthread);
+      break;
+
+    case PTHREAD_TERMINATED:
+      /* Pretend THREAD wasn't there in the first place.  */
+      __pthread_mutex_unlock (&pthread->state_lock);
+      err = ESRCH;
+      break;
+
+    default:
+      /* Thou shalt not join non-joinable threads!  */
+      __pthread_mutex_unlock (&pthread->state_lock);
+      err = EINVAL;
+      break;
+    }
+
+  return err;
+}