1 files changed, 107 insertions, 0 deletions
diff --git a/sysdeps/htl/pt-mutex-unlock.c b/sysdeps/htl/pt-mutex-unlock.c
new file mode 100644
index 0000000000..b5ea05584f
--- /dev/null
+++ b/sysdeps/htl/pt-mutex-unlock.c
@@ -0,0 +1,107 @@
+/* Unlock a mutex.  Generic version.
+   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 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+
+#include <pt-internal.h>
+
+#define LOSE do { * (int *) 0 = 0; } while (1)
+
+/* Unlock MUTEX, rescheduling a waiting thread.  */
+int
+__pthread_mutex_unlock (pthread_mutex_t *mutex)
+{
+  struct __pthread *wakeup;
+  const struct __pthread_mutexattr *attr = mutex->__attr;
+
+  if (attr == __PTHREAD_ERRORCHECK_MUTEXATTR)
+    attr = &__pthread_errorcheck_mutexattr;
+  if (attr == __PTHREAD_RECURSIVE_MUTEXATTR)
+    attr = &__pthread_recursive_mutexattr;
+
+  __pthread_spin_lock (&mutex->__lock);
+
+  if (attr == NULL || attr->__mutex_type == PTHREAD_MUTEX_NORMAL)
+    {
+#if defined(ALWAYS_TRACK_MUTEX_OWNER)
+# ifndef NDEBUG
+      if (_pthread_self ())
+	{
+	  assert (mutex->__owner);
+	  assert (mutex->__owner == _pthread_self ());
+	  mutex->__owner = NULL;
+	}
+# endif
+#endif
+    }
+  else
+    switch (attr->__mutex_type)
+      {
+      case PTHREAD_MUTEX_ERRORCHECK:
+      case PTHREAD_MUTEX_RECURSIVE:
+	if (mutex->__owner != _pthread_self ())
+	  {
+	    __pthread_spin_unlock (&mutex->__lock);
+	    return EPERM;
+	  }
+
+	if (attr->__mutex_type == PTHREAD_MUTEX_RECURSIVE)
+	  if (--mutex->__locks > 0)
+	    {
+	      __pthread_spin_unlock (&mutex->__lock);
+	      return 0;
+	    }
+
+	mutex->__owner = 0;
+	break;
+
+      default:
+	LOSE;
+      }
+
+
+  if (mutex->__queue == NULL)
+    {
+      __pthread_spin_unlock (&mutex->__held);
+      __pthread_spin_unlock (&mutex->__lock);
+      return 0;
+    }
+
+  wakeup = mutex->__queue;
+  __pthread_dequeue (wakeup);
+
+#ifndef NDEBUG
+# if !defined (ALWAYS_TRACK_MUTEX_OWNER)
+  if (attr != NULL && attr->__mutex_type != PTHREAD_MUTEX_NORMAL)
+# endif
+    {
+      mutex->__owner = wakeup;
+    }
+#endif
+
+  /* We do not unlock MUTEX->held: we are transferring the ownership
+     to the thread that we are waking up.  */
+
+  __pthread_spin_unlock (&mutex->__lock);
+  __pthread_wakeup (wakeup);
+
+  return 0;
+}
+
+strong_alias (__pthread_mutex_unlock, _pthread_mutex_unlock);
+strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock);