1 | // https://github.com/rbehrends/vspace |
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2 | #include "vspace.h" |
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3 | #include "kernel/mod2.h" |
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4 | #ifdef HAVE_VSPACE |
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5 | #include <cstdlib> |
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6 | #include <unistd.h> |
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7 | #include <sys/mman.h> |
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8 | #include <sys/stat.h> |
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9 | |
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10 | #ifdef HAVE_CPP_THREADS |
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11 | #include <thread> |
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12 | #endif |
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13 | |
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14 | namespace vspace { |
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15 | namespace internals { |
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16 | |
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17 | size_t config[4] |
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18 | = { METABLOCK_SIZE, MAX_PROCESS, SEGMENT_SIZE, MAX_SEGMENTS }; |
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19 | |
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20 | VMem VMem::vmem_global; |
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21 | |
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22 | // offsetof() only works for POD types, so we need to construct |
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23 | // a portable version of it for metapage fields. |
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24 | |
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25 | #define metapageaddr(field) \ |
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26 | ((char *) &vmem.metapage->field - (char *) vmem.metapage) |
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27 | |
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28 | size_t VMem::filesize() { |
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29 | struct stat stat; |
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30 | fstat(fd, &stat); |
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31 | return stat.st_size; |
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32 | } |
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33 | |
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34 | Status VMem::init(int fd) { |
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35 | this->fd = fd; |
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36 | for (int i = 0; i < MAX_SEGMENTS; i++) |
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37 | segments[i] = VSeg(NULL); |
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38 | for (int i = 0; i < MAX_PROCESS; i++) { |
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39 | int channel[2]; |
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40 | if (pipe(channel) < 0) { |
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41 | for (int j = 0; j < i; j++) { |
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42 | close(channels[j].fd_read); |
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43 | close(channels[j].fd_write); |
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44 | } |
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45 | return Status(ErrOS); |
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46 | } |
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47 | channels[i].fd_read = channel[0]; |
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48 | channels[i].fd_write = channel[1]; |
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49 | } |
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50 | lock_metapage(); |
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51 | init_metapage(filesize() == 0); |
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52 | unlock_metapage(); |
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53 | freelist = metapage->freelist; |
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54 | return Status(ErrNone); |
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55 | } |
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56 | |
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57 | Status VMem::init() { |
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58 | FILE *fp = tmpfile(); |
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59 | Status result = init(fileno(fp)); |
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60 | if (!result.ok()) |
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61 | return result; |
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62 | current_process = 0; |
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63 | file_handle = fp; |
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64 | metapage->process_info[0].pid = getpid(); |
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65 | return Status(ErrNone); |
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66 | } |
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67 | |
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68 | Status VMem::init(const char *path) { |
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69 | int fd = open(path, O_RDWR | O_CREAT, 0600); |
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70 | if (fd < 0) |
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71 | return Status(ErrFile); |
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72 | init(fd); |
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73 | lock_metapage(); |
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74 | // TODO: enter process in meta table |
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75 | unlock_metapage(); |
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76 | return Status(ErrNone); |
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77 | } |
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78 | |
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79 | void VMem::deinit() { |
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80 | if (file_handle) { |
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81 | fclose(file_handle); |
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82 | file_handle = NULL; |
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83 | } else { |
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84 | close(fd); |
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85 | } |
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86 | munmap(metapage, METABLOCK_SIZE); |
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87 | metapage = NULL; |
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88 | current_process = -1; |
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89 | freelist = NULL; |
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90 | for (int i = 0; i < MAX_SEGMENTS; i++) { |
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91 | if (!segments[i].is_free()) |
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92 | munmap(segments[i].base, SEGMENT_SIZE); |
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93 | segments[i] = VSeg(NULL); |
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94 | } |
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95 | for (int i = 0; i < MAX_PROCESS; i++) { |
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96 | close(channels[i].fd_read); |
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97 | close(channels[i].fd_write); |
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98 | } |
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99 | } |
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100 | |
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101 | void *VMem::mmap_segment(int seg) { |
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102 | lock_metapage(); |
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103 | void *map = mmap(NULL, SEGMENT_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, |
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104 | METABLOCK_SIZE + seg * SEGMENT_SIZE); |
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105 | if (map == MAP_FAILED) { |
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106 | // This is an "impossible to proceed from here, because system state |
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107 | // is impossible to proceed from" situation, so we abort the program. |
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108 | perror("mmap"); |
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109 | abort(); |
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110 | } |
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111 | unlock_metapage(); |
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112 | return map; |
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113 | } |
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114 | |
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115 | void VMem::add_segment() { |
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116 | int seg = metapage->segment_count++; |
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117 | ftruncate(fd, METABLOCK_SIZE + metapage->segment_count * SEGMENT_SIZE); |
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118 | void *map_addr = mmap_segment(seg); |
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119 | segments[seg] = VSeg(map_addr); |
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120 | Block *top = block_ptr(seg * SEGMENT_SIZE); |
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121 | top->next = freelist[LOG2_SEGMENT_SIZE]; |
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122 | top->prev = VADDR_NULL; |
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123 | freelist[LOG2_SEGMENT_SIZE] = seg * SEGMENT_SIZE; |
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124 | } |
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125 | |
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126 | void FastLock::lock() { |
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127 | #ifdef HAVE_CPP_THREADS |
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128 | while (_lock.test_and_set()) { |
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129 | } |
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130 | bool empty = _owner < 0; |
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131 | if (empty) { |
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132 | _owner = vmem.current_process; |
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133 | } else { |
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134 | int p = vmem.current_process; |
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135 | vmem.metapage->process_info[p].next = -1; |
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136 | if (_head < 0) |
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137 | _head = p; |
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138 | else |
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139 | vmem.metapage->process_info[_tail].next = p; |
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140 | _tail = p; |
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141 | } |
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142 | _lock.clear(); |
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143 | if (!empty) |
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144 | wait_signal(false); |
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145 | #else |
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146 | lock_file(vmem.fd, _offset); |
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147 | #endif |
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148 | } |
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149 | |
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150 | void FastLock::unlock() { |
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151 | #ifdef HAVE_CPP_THREADS |
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152 | while (_lock.test_and_set()) { |
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153 | } |
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154 | _owner = _head; |
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155 | if (_owner >= 0) |
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156 | _head = vmem.metapage->process_info[_head].next; |
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157 | _lock.clear(); |
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158 | if (_owner >= 0) |
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159 | send_signal(_owner, 0, false); |
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160 | #else |
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161 | unlock_file(vmem.fd, _offset); |
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162 | #endif |
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163 | } |
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164 | |
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165 | static void lock_allocator() { |
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166 | vmem.metapage->allocator_lock.lock(); |
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167 | } |
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168 | |
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169 | static void unlock_allocator() { |
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170 | vmem.metapage->allocator_lock.unlock(); |
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171 | } |
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172 | |
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173 | static void print_freelists() { |
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174 | for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) { |
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175 | vaddr_t vaddr = vmem.freelist[i]; |
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176 | if (vaddr != VADDR_NULL) { |
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177 | std::printf("%2d: %ld", i, vaddr); |
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178 | vaddr_t prev = block_ptr(vaddr)->prev; |
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179 | if (prev != VADDR_NULL) { |
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180 | std::printf("(%ld)", prev); |
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181 | } |
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182 | assert(block_ptr(vaddr)->prev == VADDR_NULL); |
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183 | for (;;) { |
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184 | vaddr_t last_vaddr = vaddr; |
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185 | Block *block = block_ptr(vaddr); |
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186 | vaddr = block->next; |
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187 | if (vaddr == VADDR_NULL) |
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188 | break; |
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189 | std::printf(" -> %ld", vaddr); |
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190 | vaddr_t prev = block_ptr(vaddr)->prev; |
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191 | if (prev != last_vaddr) { |
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192 | std::printf("(%ld)", prev); |
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193 | } |
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194 | } |
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195 | std::printf("\n"); |
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196 | } |
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197 | } |
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198 | std::fflush(stdout); |
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199 | } |
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200 | |
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201 | void vmem_free(vaddr_t vaddr) { |
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202 | lock_allocator(); |
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203 | vaddr -= offsetof(Block, data); |
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204 | vmem.ensure_is_mapped(vaddr); |
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205 | size_t segno = vmem.segment_no(vaddr); |
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206 | VSeg seg = vmem.segment(vaddr); |
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207 | segaddr_t addr = vmem.segaddr(vaddr); |
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208 | int level = seg.block_ptr(addr)->level(); |
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209 | assert(!seg.is_free(addr)); |
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210 | while (level < LOG2_SEGMENT_SIZE) { |
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211 | segaddr_t buddy = find_buddy(addr, level); |
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212 | Block *block = seg.block_ptr(buddy); |
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213 | // is buddy free and at the same level? |
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214 | if (!block->is_free() || block->level() != level) |
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215 | break; |
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216 | // remove buddy from freelist. |
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217 | Block *prev = vmem.block_ptr(block->prev); |
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218 | Block *next = vmem.block_ptr(block->next); |
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219 | block->data[0] = level; |
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220 | if (prev) { |
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221 | assert(prev->next == vmem.vaddr(segno, buddy)); |
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222 | prev->next = block->next; |
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223 | } else { |
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224 | // head of freelist. |
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225 | assert(vmem.freelist[level] == vmem.vaddr(segno, buddy)); |
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226 | vmem.freelist[level] = block->next; |
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227 | } |
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228 | if (next) { |
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229 | assert(next->prev == vmem.vaddr(segno, buddy)); |
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230 | next->prev = block->prev; |
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231 | } |
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232 | // coalesce block with buddy |
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233 | level++; |
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234 | if (buddy < addr) |
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235 | addr = buddy; |
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236 | } |
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237 | // Add coalesced block to free list |
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238 | Block *block = seg.block_ptr(addr); |
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239 | block->prev = VADDR_NULL; |
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240 | block->next = vmem.freelist[level]; |
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241 | block->mark_as_free(level); |
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242 | vaddr_t blockaddr = vmem.vaddr(segno, addr); |
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243 | if (block->next != VADDR_NULL) |
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244 | vmem.block_ptr(block->next)->prev = blockaddr; |
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245 | vmem.freelist[level] = blockaddr; |
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246 | unlock_allocator(); |
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247 | } |
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248 | |
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249 | vaddr_t vmem_alloc(size_t size) { |
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250 | lock_allocator(); |
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251 | size_t alloc_size = size + offsetof(Block, data); |
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252 | int level = find_level(alloc_size); |
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253 | int flevel = level; |
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254 | while (flevel < LOG2_SEGMENT_SIZE && vmem.freelist[flevel] == VADDR_NULL) |
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255 | flevel++; |
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256 | if (vmem.freelist[flevel] == VADDR_NULL) { |
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257 | vmem.add_segment(); |
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258 | } |
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259 | vmem.ensure_is_mapped(vmem.freelist[flevel]); |
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260 | while (flevel > level) { |
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261 | // get and split a block |
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262 | vaddr_t blockaddr = vmem.freelist[flevel]; |
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263 | assert((blockaddr & ((1 << flevel) - 1)) == 0); |
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264 | Block *block = vmem.block_ptr(blockaddr); |
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265 | vmem.freelist[flevel] = block->next; |
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266 | if (vmem.freelist[flevel] != VADDR_NULL) |
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267 | vmem.block_ptr(vmem.freelist[flevel])->prev = VADDR_NULL; |
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268 | vaddr_t blockaddr2 = blockaddr + (1 << (flevel - 1)); |
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269 | Block *block2 = vmem.block_ptr(blockaddr2); |
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270 | flevel--; |
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271 | block2->next = vmem.freelist[flevel]; |
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272 | block2->prev = blockaddr; |
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273 | block->next = blockaddr2; |
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274 | block->prev = VADDR_NULL; |
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275 | // block->prev == VADDR_NULL already. |
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276 | vmem.freelist[flevel] = blockaddr; |
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277 | } |
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278 | assert(vmem.freelist[level] != VADDR_NULL); |
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279 | Block *block = vmem.block_ptr(vmem.freelist[level]); |
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280 | vaddr_t vaddr = vmem.freelist[level]; |
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281 | vaddr_t result = vaddr + offsetof(Block, data); |
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282 | vmem.freelist[level] = block->next; |
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283 | if (block->next != VADDR_NULL) |
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284 | vmem.block_ptr(block->next)->prev = VADDR_NULL; |
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285 | block->mark_as_allocated(vaddr, level); |
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286 | unlock_allocator(); |
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287 | memset(block->data, 0, size); |
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288 | return result; |
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289 | } |
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290 | |
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291 | void init_flock_struct( |
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292 | struct flock &lock_info, size_t offset, size_t len, bool lock) { |
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293 | lock_info.l_start = offset; |
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294 | lock_info.l_len = len; |
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295 | lock_info.l_pid = 0; |
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296 | lock_info.l_type = lock ? F_WRLCK : F_UNLCK; |
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297 | lock_info.l_whence = SEEK_SET; |
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298 | } |
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299 | |
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300 | void lock_file(int fd, size_t offset, size_t len) { |
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301 | struct flock lock_info; |
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302 | init_flock_struct(lock_info, offset, len, true); |
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303 | fcntl(fd, F_SETLKW, &lock_info); |
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304 | } |
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305 | |
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306 | void unlock_file(int fd, size_t offset, size_t len) { |
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307 | struct flock lock_info; |
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308 | init_flock_struct(lock_info, offset, len, false); |
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309 | fcntl(fd, F_SETLKW, &lock_info); |
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310 | } |
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311 | |
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312 | void lock_metapage() { |
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313 | lock_file(vmem.fd, 0); |
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314 | } |
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315 | |
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316 | void unlock_metapage() { |
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317 | unlock_file(vmem.fd, 0); |
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318 | } |
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319 | |
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320 | void init_metapage(bool create) { |
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321 | if (create) |
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322 | ftruncate(vmem.fd, METABLOCK_SIZE); |
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323 | vmem.metapage = (MetaPage *) mmap( |
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324 | NULL, METABLOCK_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, vmem.fd, 0); |
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325 | if (create) { |
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326 | std::memcpy(vmem.metapage->config_header, config, sizeof(config)); |
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327 | for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) { |
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328 | vmem.metapage->freelist[i] = VADDR_NULL; |
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329 | } |
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330 | vmem.metapage->segment_count = 0; |
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331 | vmem.metapage->allocator_lock = FastLock(metapageaddr(allocator_lock)); |
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332 | } else { |
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333 | assert(std::memcmp(vmem.metapage->config_header, config, |
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334 | sizeof(config)) != 0); |
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335 | } |
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336 | } |
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337 | |
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338 | static void lock_process(int processno) { |
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339 | lock_file(vmem.fd, |
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340 | metapageaddr(process_info) |
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341 | + sizeof(ProcessInfo) * vmem.current_process); |
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342 | } |
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343 | |
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344 | static void unlock_process(int processno) { |
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345 | unlock_file(vmem.fd, |
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346 | metapageaddr(process_info) |
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347 | + sizeof(ProcessInfo) * vmem.current_process); |
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348 | } |
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349 | |
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350 | static ProcessInfo &process_info(int processno) { |
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351 | return vmem.metapage->process_info[processno]; |
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352 | } |
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353 | |
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354 | bool send_signal(int processno, ipc_signal_t sig, bool lock) { |
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355 | if (lock) |
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356 | lock_process(processno); |
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357 | if (process_info(processno).sigstate != Waiting) { |
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358 | unlock_process(processno); |
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359 | return false; |
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360 | } |
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361 | if (processno == vmem.current_process) { |
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362 | process_info(processno).sigstate = Accepted; |
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363 | process_info(processno).signal = sig; |
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364 | } else { |
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365 | process_info(processno).sigstate = Pending; |
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366 | process_info(processno).signal = sig; |
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367 | int fd = vmem.channels[processno].fd_write; |
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368 | char buf[1] = { 0 }; |
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369 | while (write(fd, buf, 1) != 1) { |
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370 | } |
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371 | } |
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372 | if (lock) |
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373 | unlock_process(processno); |
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374 | return true; |
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375 | } |
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376 | |
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377 | ipc_signal_t check_signal(bool resume, bool lock) { |
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378 | ipc_signal_t result; |
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379 | if (lock) |
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380 | lock_process(vmem.current_process); |
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381 | SignalState sigstate = process_info(vmem.current_process).sigstate; |
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382 | switch (sigstate) { |
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383 | case Waiting: |
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384 | case Pending: { |
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385 | int fd = vmem.channels[vmem.current_process].fd_read; |
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386 | char buf[1]; |
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387 | if (lock && sigstate == Waiting) { |
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388 | unlock_process(vmem.current_process); |
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389 | while (read(fd, buf, 1) != 1) { |
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390 | } |
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391 | lock_process(vmem.current_process); |
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392 | } else { |
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393 | while (read(fd, buf, 1) != 1) { |
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394 | } |
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395 | } |
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396 | result = process_info(vmem.current_process).signal; |
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397 | process_info(vmem.current_process).sigstate |
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398 | = resume ? Waiting : Accepted; |
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399 | if (lock) |
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400 | unlock_process(vmem.current_process); |
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401 | break; |
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402 | } |
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403 | case Accepted: |
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404 | result = process_info(vmem.current_process).signal; |
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405 | if (resume) |
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406 | process_info(vmem.current_process).sigstate = Waiting; |
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407 | if (lock) |
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408 | unlock_process(vmem.current_process); |
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409 | break; |
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410 | } |
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411 | return result; |
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412 | } |
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413 | |
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414 | void accept_signals() { |
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415 | lock_process(vmem.current_process); |
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416 | process_info(vmem.current_process).sigstate = Waiting; |
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417 | unlock_process(vmem.current_process); |
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418 | } |
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419 | |
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420 | ipc_signal_t wait_signal(bool lock) { |
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421 | return check_signal(true, lock); |
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422 | } |
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423 | |
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424 | } // namespace internals |
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425 | |
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426 | pid_t fork_process() { |
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427 | using namespace internals; |
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428 | lock_metapage(); |
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429 | for (int p = 0; p < MAX_PROCESS; p++) { |
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430 | if (vmem.metapage->process_info[p].pid == 0) { |
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431 | pid_t pid = fork(); |
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432 | if (pid < 0) { |
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433 | // error |
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434 | return -1; |
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435 | } else if (pid == 0) { |
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436 | // child process |
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437 | int parent = vmem.current_process; |
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438 | vmem.current_process = p; |
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439 | lock_metapage(); |
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440 | vmem.metapage->process_info[p].pid = getpid(); |
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441 | unlock_metapage(); |
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442 | send_signal(parent); |
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443 | } else { |
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444 | // parent process |
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445 | unlock_metapage(); |
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446 | wait_signal(); |
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447 | // child has unlocked metapage, so we don't need to. |
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448 | } |
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449 | return pid; |
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450 | } |
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451 | } |
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452 | unlock_metapage(); |
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453 | return -1; |
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454 | } |
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455 | |
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456 | void Semaphore::post() { |
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457 | int wakeup = -1; |
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458 | internals::ipc_signal_t sig; |
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459 | _lock.lock(); |
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460 | if (_head == _tail) { |
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461 | _value++; |
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462 | } else { |
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463 | // don't increment value, as we'll pass that on to the next process. |
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464 | wakeup = _waiting[_head]; |
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465 | sig = _signals[_head]; |
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466 | next(_head); |
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467 | } |
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468 | _lock.unlock(); |
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469 | if (wakeup >= 0) { |
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470 | internals::send_signal(wakeup, sig); |
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471 | } |
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472 | } |
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473 | |
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474 | bool Semaphore::try_wait() { |
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475 | bool result = false; |
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476 | _lock.lock(); |
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477 | if (_value > 0) { |
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478 | _value--; |
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479 | result = true; |
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480 | } |
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481 | _lock.unlock(); |
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482 | return result; |
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483 | } |
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484 | |
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485 | void Semaphore::wait() { |
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486 | _lock.lock(); |
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487 | if (_value > 0) { |
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488 | _value--; |
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489 | _lock.unlock(); |
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490 | return; |
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491 | } |
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492 | _waiting[_tail] = internals::vmem.current_process; |
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493 | _signals[_tail] = 0; |
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494 | next(_tail); |
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495 | _lock.unlock(); |
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496 | internals::wait_signal(); |
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497 | } |
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498 | |
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499 | bool Semaphore::start_wait(internals::ipc_signal_t sig) { |
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500 | _lock.lock(); |
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501 | if (_value > 0) { |
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502 | if (internals::send_signal(internals::vmem.current_process, sig)) |
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503 | _value--; |
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504 | _lock.unlock(); |
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505 | return false; |
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506 | } |
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507 | _waiting[_tail] = internals::vmem.current_process; |
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508 | _signals[_tail] = sig; |
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509 | next(_tail); |
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510 | _lock.unlock(); |
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511 | return true; |
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512 | } |
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513 | |
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514 | bool Semaphore::stop_wait() { |
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515 | bool result = false; |
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516 | _lock.lock(); |
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517 | for (int i = _head; i != _tail; next(i)) { |
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518 | if (_waiting[i] == internals::vmem.current_process) { |
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519 | int last = i; |
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520 | next(i); |
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521 | while (i != _tail) { |
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522 | _waiting[last] = _waiting[i]; |
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523 | _signals[last] = _signals[i]; |
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524 | last = i; |
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525 | next(i); |
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526 | } |
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527 | _tail = last; |
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528 | result = true; |
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529 | break; |
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530 | } |
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531 | } |
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532 | _lock.unlock(); |
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533 | return result; |
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534 | } |
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535 | |
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536 | void EventSet::add(Event *event) { |
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537 | event->_next = NULL; |
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538 | if (_head == NULL) { |
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539 | _head = _tail = event; |
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540 | } else { |
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541 | _tail->_next = event; |
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542 | _tail = event; |
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543 | } |
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544 | } |
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545 | |
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546 | int EventSet::wait() { |
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547 | size_t n = 0; |
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548 | for (Event *event = _head; event; event = event->_next) { |
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549 | if (!event->start_listen((int) (n++))) { |
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550 | break; |
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551 | } |
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552 | } |
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553 | internals::ipc_signal_t result = internals::check_signal(); |
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554 | for (Event *event = _head; event; event = event->_next) { |
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555 | event->stop_listen(); |
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556 | } |
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557 | internals::accept_signals(); |
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558 | return (int) result; |
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559 | } |
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560 | |
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561 | } // namespace vspace |
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562 | #endif |
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