X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Flttng%2Fwait.h;fp=include%2Flttng%2Fwait.h;h=6cc0e3732cec710133000d9d9dfd15b6556d1938;hb=4318ae1be57eb7983ab4857a7a8eeb4a030a8216;hp=0000000000000000000000000000000000000000;hpb=d4419b81b243bc3a6bdd4a09b3ca2216d044a1c7;p=ust.git

diff --git a/include/lttng/wait.h b/include/lttng/wait.h
new file mode 100644
index 0000000..6cc0e37
--- /dev/null
+++ b/include/lttng/wait.h
@@ -0,0 +1,50 @@
+#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 */