Halaman utama Jelajahi Bantuan
Masuk
SoftwareDesign
/
csu3_am335x
8
0
Fork 0
Berkas Masalah 0 Permintaan Tarik 0 Wiki
Cabang: master
Ranting Tag
csu3_am335x
/
linux-devkit
/
sysroots
/
armv7ahf-neon-linux-gnueabi
/
usr
/
include
/
tbb
/
null_mutex.h

null_mutex.h 2.2 KB
Permalink Riwayat Mentahan

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263 
  1. /*
    2. 

  2.     Copyright 2005-2013 Intel Corporation.  All Rights Reserved.
    3. 

  3. 

  4.     This file is part of Threading Building Blocks.
    5. 

  5. 

  6.     Threading Building Blocks is free software; you can redistribute it
    7. 

  7.     and/or modify it under the terms of the GNU General Public License
    8. 

  8.     version 2 as published by the Free Software Foundation.
    9. 

  9. 

  10.     Threading Building Blocks is distributed in the hope that it will be
    11. 

  11.     useful, but WITHOUT ANY WARRANTY; without even the implied warranty
    12. 

  12.     of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13. 

  13.     GNU General Public License for more details.
    14. 

  14. 

  15.     You should have received a copy of the GNU General Public License
    16. 

  16.     along with Threading Building Blocks; if not, write to the Free Software
    17. 

  17.     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18. 

  18. 

  19.     As a special exception, you may use this file as part of a free software
    20. 

  20.     library without restriction.  Specifically, if other files instantiate
    21. 

  21.     templates or use macros or inline functions from this file, or you compile
    22. 

  22.     this file and link it with other files to produce an executable, this
    23. 

  23.     file does not by itself cause the resulting executable to be covered by
    24. 

  24.     the GNU General Public License.  This exception does not however
    25. 

  25.     invalidate any other reasons why the executable file might be covered by
    26. 

  26.     the GNU General Public License.
    27. 

  27. */
    28. 

  28. 

  29. #ifndef __TBB_null_mutex_H
    30. 

  30. #define __TBB_null_mutex_H
    31. 

  31. 

  32. namespace tbb {
    33. 

  33.     
    34. 

  34. //! A mutex which does nothing
    35. 

  35. /** A null_mutex does no operation and simulates success.
    36. 

  36.     @ingroup synchronization */
    37. 

  37. class null_mutex {   
    38. 

  38.     //! Deny assignment and copy construction 
    39. 

  39.     null_mutex( const null_mutex& );   
    40. 

  40.     void operator=( const null_mutex& );   
    41. 

  41. public:   
    42. 

  42.     //! Represents acquisition of a mutex.
    43. 

  43.     class scoped_lock {   
    44. 

  44.     public:   
    45. 

  45.         scoped_lock() {}
    46. 

  46.         scoped_lock( null_mutex& ) {}   
    47. 

  47.         ~scoped_lock() {}
    48. 

  48.         void acquire( null_mutex& ) {}
    49. 

  49.         bool try_acquire( null_mutex& ) { return true; }
    50. 

  50.         void release() {}
    51. 

  51.     };
    52. 

  52.   
    53. 

  53.     null_mutex() {}
    54. 

  54.     
    55. 

  55.     // Mutex traits   
    56. 

  56.     static const bool is_rw_mutex = false;   
    57. 

  57.     static const bool is_recursive_mutex = true;
    58. 

  58.     static const bool is_fair_mutex = true;
    59. 

  59. };  
    60. 

  60. 

  61. }
    62. 

  62. 

  63. #endif /* __TBB_null_mutex_H */
    64.