1 | // (C) Copyright 2013 Ruslan Baratov
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2 | //
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3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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5 |
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6 | // See www.boost.org/libs/thread for documentation.
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7 |
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8 | #ifndef BOOST_THREAD_WITH_LOCK_GUARD_HPP
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9 | #define BOOST_THREAD_WITH_LOCK_GUARD_HPP
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10 |
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11 | #include <boost/thread/lock_guard.hpp>
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12 | #include <boost/utility/result_of.hpp>
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13 |
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14 | namespace boost {
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15 |
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16 | #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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17 |
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18 | /**
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19 | * Utility to run functions in scope protected by mutex.
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20 | *
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21 | * Examples:
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22 | *
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23 | * int func(int, int&);
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24 | * boost::mutex m;
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25 | * int a;
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26 | * int result = boost::with_lock_guard(m, func, 1, boost::ref(a));
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27 | *
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28 | * // using boost::bind
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29 | * int result = boost::with_lock_guard(
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30 | * m, boost::bind(func, 2, boost::ref(a))
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31 | * );
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32 | *
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33 | * // using lambda
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34 | * int a;
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35 | * int result = boost::with_lock_guard(
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36 | * m,
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37 | * [&a](int x) {
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38 | * a = 3;
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39 | * return x + 4;
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40 | * },
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41 | * 5
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42 | * );
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43 | */
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44 | template <class Lockable, class Function, class... Args>
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45 | auto with_lock_guard(
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46 | Lockable& m,
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47 | BOOST_FWD_REF(Function) f,
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48 | BOOST_FWD_REF(Args)... args
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49 | ) -> decltype(f(boost::forward<Args>(args)...)) {
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50 | boost::lock_guard<Lockable> lock(m);
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51 | return f(boost::forward<Args>(args)...);
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52 | }
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53 |
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54 | #else
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55 |
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56 | // Workaround versions for compilers without c++11 support.
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57 | // (function arguments limit: 4, no lambda support)
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58 |
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59 | template <class Lockable, class Func>
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60 | typename boost::result_of<Func()>::type with_lock_guard(
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61 | Lockable& m,
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62 | Func func
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63 | ) {
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64 | boost::lock_guard<Lockable> lock(m);
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65 | return func();
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66 | }
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67 |
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68 | template <class Lockable, class Func, class Arg>
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69 | typename boost::result_of<Func(Arg)>::type with_lock_guard(
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70 | Lockable& m,
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71 | Func func,
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72 | BOOST_FWD_REF(Arg) arg
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73 | ) {
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74 | boost::lock_guard<Lockable> lock(m);
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75 | return func(
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76 | boost::forward<Arg>(arg)
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77 | );
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78 | }
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79 |
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80 | template <class Lockable, class Func, class Arg1, class Arg2>
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81 | typename boost::result_of<Func(Arg1, Arg2)>::type with_lock_guard(
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82 | Lockable& m,
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83 | Func func,
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84 | BOOST_FWD_REF(Arg1) arg1,
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85 | BOOST_FWD_REF(Arg2) arg2
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86 | ) {
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87 | boost::lock_guard<Lockable> lock(m);
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88 | return func(
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89 | boost::forward<Arg1>(arg1),
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90 | boost::forward<Arg2>(arg2)
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91 | );
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92 | }
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93 |
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94 | template <class Lockable, class Func, class Arg1, class Arg2, class Arg3>
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95 | typename boost::result_of<Func(Arg1, Arg2, Arg3)>::type with_lock_guard(
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96 | Lockable& m,
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97 | Func func,
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98 | BOOST_FWD_REF(Arg1) arg1,
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99 | BOOST_FWD_REF(Arg2) arg2,
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100 | BOOST_FWD_REF(Arg3) arg3
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101 | ) {
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102 | boost::lock_guard<Lockable> lock(m);
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103 | return func(
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104 | boost::forward<Arg1>(arg1),
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105 | boost::forward<Arg2>(arg2),
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106 | boost::forward<Arg3>(arg3)
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107 | );
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108 | }
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109 |
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110 | template <
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111 | class Lockable, class Func, class Arg1, class Arg2, class Arg3, class Arg4
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112 | >
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113 | typename boost::result_of<Func(Arg1, Arg2, Arg3, Arg4)>::type with_lock_guard(
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114 | Lockable& m,
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115 | Func func,
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116 | BOOST_FWD_REF(Arg1) arg1,
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117 | BOOST_FWD_REF(Arg2) arg2,
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118 | BOOST_FWD_REF(Arg3) arg3,
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119 | BOOST_FWD_REF(Arg4) arg4
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120 | ) {
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121 | boost::lock_guard<Lockable> lock(m);
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122 | return func(
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123 | boost::forward<Arg1>(arg1),
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124 | boost::forward<Arg2>(arg2),
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125 | boost::forward<Arg3>(arg3),
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126 | boost::forward<Arg4>(arg4)
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127 | );
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128 | }
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129 |
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130 | #endif // BOOST_NO_CXX11_VARIADIC_TEMPLATES
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131 |
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132 | } // namespace boost
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133 |
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134 | #endif // BOOST_THREAD_WITH_LOCK_GUARD_HPP
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