1 files changed, 46 insertions, 0 deletions
diff --git a/libpthread/sysdeps/l4/hurd/pt-wakeup.c b/libpthread/sysdeps/l4/hurd/pt-wakeup.c
new file mode 100644
index 00000000..e568a6f9
--- /dev/null
+++ b/libpthread/sysdeps/l4/hurd/pt-wakeup.c
@@ -0,0 +1,46 @@
+/* Wakeup a thread.  Viengoos version.
+   Copyright (C) 2008 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,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <pt-internal.h>
+
+#include <hurd/stddef.h>
+#include <hurd/futex.h>
+#include <stdint.h>
+
+/* Wakeup THREAD.  */
+void
+__pthread_wakeup (struct __pthread *thread)
+{
+  /* We need to loop here as the blocked thread may not yet be
+     blocked!  Here's what happens when a thread blocks: it registers
+     itself as blocked, drops the relevant lock and then actually
+     blocks (via __pthread_block).  This means that after dropping the
+     lock and before blocking, it may be interrupted and another
+     thread may try to wake it.  */
+  long ret;
+  do
+    {
+      ret = futex_wake (&thread->threadid, INT_MAX);
+      assertx (ret <= 1, "tid: %x, ret: %d", thread->threadid, ret);
+
+      if (ret == 0)
+	l4_thread_switch (thread->threadid);
+    }
+  while (ret == 0);
+}