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1 /* cilk_fiber-unix.h -*-C++-*-
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2 *
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3 *************************************************************************
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4 *
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5 * Copyright (C) 2012-2016, Intel Corporation
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6 * All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * * Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * * Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in
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16 * the documentation and/or other materials provided with the
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17 * distribution.
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18 * * Neither the name of Intel Corporation nor the names of its
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19 * contributors may be used to endorse or promote products derived
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20 * from this software without specific prior written permission.
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21 *
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22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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29 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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32 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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33 * POSSIBILITY OF SUCH DAMAGE.
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34 *
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35 * *********************************************************************
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36 *
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37 * PLEASE NOTE: This file is a downstream copy of a file mainitained in
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38 * a repository at cilkplus.org. Changes made to this file that are not
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39 * submitted through the contribution process detailed at
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40 * http://www.cilkplus.org/submit-cilk-contribution will be lost the next
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41 * time that a new version is released. Changes only submitted to the
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42 * GNU compiler collection or posted to the git repository at
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43 * https://bitbucket.org/intelcilkruntime/intel-cilk-runtime.git are
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44 * not tracked.
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45 *
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46 * We welcome your contributions to this open source project. Thank you
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47 * for your assistance in helping us improve Cilk Plus.
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48 **************************************************************************/
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49
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50 #ifndef INCLUDED_CILK_FIBER_UNIX_DOT_H
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51 #define INCLUDED_CILK_FIBER_UNIX_DOT_H
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52
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53 #ifndef __cplusplus
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54 # error cilk_fiber-unix.h is a C++-only header
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55 #endif
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56
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57 #include "cilk_fiber.h"
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58 #include "jmpbuf.h"
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59
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60 /**
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61 * @file cilk_fiber-unix.h
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62 *
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63 * @brief Unix-specific implementation for cilk_fiber.
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64 */
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65
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66 /**
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67 * @brief Unix-specific fiber class derived from portable fiber class
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68 */
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69 struct cilk_fiber_sysdep : public cilk_fiber
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70 {
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71 public:
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72
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73 #if SUPPORT_GET_CURRENT_FIBER
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74 /**
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75 * @brief Gets the current fiber from TLS.
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76 */
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77 static cilk_fiber_sysdep* get_current_fiber_sysdep();
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78 #endif
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79
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80 /**
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81 * @brief Construct the system-dependent portion of a fiber.
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82 *
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83 * @param stack_size The size of the stack for this fiber.
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84 */
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85 cilk_fiber_sysdep(std::size_t stack_size);
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86
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87 /**
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88 * @brief Construct the system-dependent of a fiber created from a
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89 * thread.
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90 */
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91 cilk_fiber_sysdep(from_thread_t);
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92
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93 /**
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94 * @brief Destructor
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95 */
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96 ~cilk_fiber_sysdep();
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97
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98 /**
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99 * @brief OS-specific calls to convert this fiber back to thread.
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100 *
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101 * Nothing to do for Linux.
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102 */
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103 void convert_fiber_back_to_thread();
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104
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105 /**
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106 * @brief System-dependent function to suspend self and resume execution of "other".
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107 *
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108 * This fiber is suspended.
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109 *
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110 * @pre @c is_resumable() should be true.
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111 *
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112 * @param other Fiber to resume.
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113 */
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114 void suspend_self_and_resume_other_sysdep(cilk_fiber_sysdep* other);
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115
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116 /**
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117 * @brief System-dependent function called to jump to @p other
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118 * fiber.
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119 *
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120 * @pre @c is_resumable() should be false.
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121 *
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122 * @param other Fiber to resume.
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123 */
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124 NORETURN jump_to_resume_other_sysdep(cilk_fiber_sysdep* other);
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125
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126 /**
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127 * @brief Runs the start_proc.
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128 * @pre is_resumable() should be false.
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129 * @pre is_allocated_from_thread() should be false.
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130 * @pre m_start_proc must be valid.
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131 */
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132 NORETURN run();
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133
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134 /**
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135 * @brief Returns the base of this fiber's stack.
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136 */
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137 inline char* get_stack_base_sysdep() { return m_stack_base; }
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138
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139 private:
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140 char* m_stack_base; ///< The base of this fiber's stack.
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141 char* m_stack; ///< Stack memory (low address)
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142 __CILK_JUMP_BUFFER m_resume_jmpbuf; ///< Place to resume fiber
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143 unsigned m_magic; ///< Magic number for checking
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144
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145 static long s_page_size; ///< Page size for stacks.
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146
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147 // Allocate memory for a stack. This method
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148 // initializes m_stack and m_stack_base.
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149 void make_stack(size_t stack_size);
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150
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151 // Deallocates memory for the stack.
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152 void free_stack();
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153
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154 // Common helper method for implementation of resume_other_sysdep
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155 // variants.
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156 inline void resume_other_sysdep(cilk_fiber_sysdep* other);
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157 };
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158
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159 #endif // ! defined(INCLUDED_CILK_FIBER_UNIX_DOT_H)
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