1 files changed, 62 insertions, 0 deletions
diff --git a/htl/pt-cancel.c b/htl/pt-cancel.c
new file mode 100644
index 0000000000..9f877243b9
--- /dev/null
+++ b/htl/pt-cancel.c
@@ -0,0 +1,62 @@
+/* Cancel a thread.
+   Copyright (C) 2002-2018 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 <pthread.h>
+
+#include <pt-internal.h>
+
+int
+pthread_cancel (pthread_t t)
+{
+  int err = 0;
+  struct __pthread *p;
+
+  p = __pthread_getid (t);
+  if (p == NULL)
+    return ESRCH;
+
+  __pthread_mutex_lock (&p->cancel_lock);
+  if (p->cancel_pending)
+    {
+      __pthread_mutex_unlock (&p->cancel_lock);
+      return 0;
+    }
+
+  p->cancel_pending = 1;
+
+  if (p->cancel_state != PTHREAD_CANCEL_ENABLE)
+    {
+      __pthread_mutex_unlock (&p->cancel_lock);
+      return 0;
+    }
+
+  if (p->cancel_type == PTHREAD_CANCEL_ASYNCHRONOUS)
+    /* CANCEL_LOCK is unlocked by this call.  */
+    err = __pthread_do_cancel (p);
+  else
+    {
+      if (p->cancel_hook != NULL)
+	/* Thread blocking on a cancellation point.  Invoke hook to unblock.
+	   See __pthread_cond_timedwait_internal.  */
+	p->cancel_hook (p->cancel_hook_arg);
+
+      __pthread_mutex_unlock (&p->cancel_lock);
+    }
+
+  return err;
+}