os: Time abstractions.

Simplified version of u_time.[ch]

1 files changed, 92 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/os/os_time.h b/src/gallium/auxiliary/os/os_time.h
new file mode 100644
index 00000000000..5b55c1b3747
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+++ b/src/gallium/auxiliary/os/os_time.h
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+/**************************************************************************
+ *
+ * Copyright 2008-2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * OS independent time-manipulation functions.
+ * 
+ * @author Jose Fonseca <[email protected]>
+ */
+
+#ifndef _OS_TIME_H_
+#define _OS_TIME_H_
+
+
+#include "pipe/p_config.h"
+
+#if defined(PIPE_OS_UNIX)
+#  include <unistd.h> /* usleep */
+#endif
+
+#include "pipe/p_compiler.h"
+
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+/*
+ * Get the current time in microseconds from an unknown base.
+ */
+int64_t
+os_time_get(void);
+
+
+/*
+ * Sleep.
+ */
+#if defined(PIPE_OS_UNIX)
+#define os_time_sleep(_usecs) usleep(_usecs)
+#else
+void
+os_time_sleep(int64_t usecs);
+#endif
+
+
+/*
+ * Helper function for detecting time outs, taking in account overflow.
+ *
+ * Returns true the the current time has elapsed beyond the specified interval.
+ */
+static INLINE boolean
+os_time_timeout(int64_t start,
+                int64_t end,
+                int64_t curr)
+{
+   if(start <= end)
+      return !(start <= curr && curr < end);
+   else
+      return !((start <= curr) || (curr < end));
+}
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _OS_TIME_H_ */