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      1 /**************************************************************************
      2  *
      3  * Copyright 2008-2010 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 /**
     29  * @file
     30  * OS independent time-manipulation functions.
     31  *
     32  * @author Jose Fonseca <jfonseca (at) vmware.com>
     33  */
     34 
     35 #ifndef _OS_TIME_H_
     36 #define _OS_TIME_H_
     37 
     38 
     39 #include "pipe/p_config.h"
     40 
     41 #if defined(PIPE_OS_UNIX)
     42 #  include <unistd.h> /* usleep */
     43 #endif
     44 
     45 #include "pipe/p_compiler.h"
     46 
     47 
     48 #ifdef	__cplusplus
     49 extern "C" {
     50 #endif
     51 
     52 
     53 /*
     54  * Get the current time in microseconds from an unknown base.
     55  */
     56 int64_t
     57 os_time_get(void);
     58 
     59 
     60 /*
     61  * Sleep.
     62  */
     63 #if defined(PIPE_OS_UNIX)
     64 #define os_time_sleep(_usecs) usleep(_usecs)
     65 #else
     66 void
     67 os_time_sleep(int64_t usecs);
     68 #endif
     69 
     70 
     71 /*
     72  * Helper function for detecting time outs, taking in account overflow.
     73  *
     74  * Returns true if the current time has elapsed beyond the specified interval.
     75  */
     76 static INLINE boolean
     77 os_time_timeout(int64_t start,
     78                 int64_t end,
     79                 int64_t curr)
     80 {
     81    if(start <= end)
     82       return !(start <= curr && curr < end);
     83    else
     84       return !((start <= curr) || (curr < end));
     85 }
     86 
     87 
     88 #ifdef	__cplusplus
     89 }
     90 #endif
     91 
     92 #endif /* _OS_TIME_H_ */
     93