--- /dev/null
+#ifndef _UST_WAIT_H
+#define _UST_WAIT_H
+
+/*
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This 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; version 2.1 of
+ * the License.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <poll.h>
+
+/*
+ * Wait until "cond" gets true or timeout (in ms).
+ */
+#define wait_cond_interruptible_timeout(_cond, _timeout) \
+ ({ \
+ int __ret = 0, __pollret; \
+ int __timeout = _timeout; \
+ \
+ for (;;) { \
+ if (_cond) \
+ break; \
+ if (__timeout <= 0) { \
+ __ret = -ETIMEDOUT; \
+ break; \
+ } \
+ __pollret = poll(NULL, 0, 10); /* wait 10ms */ \
+ if (__pollret < 0) { \
+ __ret = -errno; \
+ break; \
+ } \
+ __timeout -= 10; \
+ } \
+ __ret; \
+ })
+
+
+#endif /* _UST_WAIT_H */