Mercurial
annotate third_party/wrk/src/ae_evport.c @ 211:a6d8d32a0261
[MrJuneJune] Simple animations for darkmode.
| author | MrJuneJune <me@mrjunejune.com> |
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| date | Sun, 15 Feb 2026 21:38:23 -0800 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* ae.c module for illumos event ports. |
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2 * |
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3 * Copyright (c) 2012, Joyent, Inc. All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions are met: |
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7 * |
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8 * * Redistributions of source code must retain the above copyright notice, |
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9 * this list of conditions and the following disclaimer. |
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10 * * Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * * Neither the name of Redis nor the names of its contributors may be used |
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14 * to endorse or promote products derived from this software without |
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15 * specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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27 * POSSIBILITY OF SUCH DAMAGE. |
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28 */ |
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29 |
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30 |
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31 #include <assert.h> |
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32 #include <errno.h> |
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33 #include <port.h> |
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34 #include <poll.h> |
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35 |
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36 #include <sys/types.h> |
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37 #include <sys/time.h> |
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38 |
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39 #include <stdio.h> |
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40 |
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41 static int evport_debug = 0; |
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42 |
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43 /* |
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44 * This file implements the ae API using event ports, present on Solaris-based |
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45 * systems since Solaris 10. Using the event port interface, we associate file |
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46 * descriptors with the port. Each association also includes the set of poll(2) |
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47 * events that the consumer is interested in (e.g., POLLIN and POLLOUT). |
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48 * |
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49 * There's one tricky piece to this implementation: when we return events via |
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50 * aeApiPoll, the corresponding file descriptors become dissociated from the |
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51 * port. This is necessary because poll events are level-triggered, so if the |
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52 * fd didn't become dissociated, it would immediately fire another event since |
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53 * the underlying state hasn't changed yet. We must re-associate the file |
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54 * descriptor, but only after we know that our caller has actually read from it. |
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55 * The ae API does not tell us exactly when that happens, but we do know that |
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56 * it must happen by the time aeApiPoll is called again. Our solution is to |
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57 * keep track of the last fds returned by aeApiPoll and re-associate them next |
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58 * time aeApiPoll is invoked. |
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59 * |
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60 * To summarize, in this module, each fd association is EITHER (a) represented |
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61 * only via the in-kernel association OR (b) represented by pending_fds and |
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62 * pending_masks. (b) is only true for the last fds we returned from aeApiPoll, |
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63 * and only until we enter aeApiPoll again (at which point we restore the |
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64 * in-kernel association). |
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65 */ |
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66 #define MAX_EVENT_BATCHSZ 512 |
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67 |
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68 typedef struct aeApiState { |
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69 int portfd; /* event port */ |
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70 int npending; /* # of pending fds */ |
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71 int pending_fds[MAX_EVENT_BATCHSZ]; /* pending fds */ |
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72 int pending_masks[MAX_EVENT_BATCHSZ]; /* pending fds' masks */ |
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73 } aeApiState; |
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74 |
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75 static int aeApiCreate(aeEventLoop *eventLoop) { |
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76 int i; |
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77 aeApiState *state = zmalloc(sizeof(aeApiState)); |
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78 if (!state) return -1; |
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79 |
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80 state->portfd = port_create(); |
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81 if (state->portfd == -1) { |
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82 zfree(state); |
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83 return -1; |
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84 } |
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85 |
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86 state->npending = 0; |
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87 |
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88 for (i = 0; i < MAX_EVENT_BATCHSZ; i++) { |
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89 state->pending_fds[i] = -1; |
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90 state->pending_masks[i] = AE_NONE; |
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91 } |
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92 |
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93 eventLoop->apidata = state; |
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94 return 0; |
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95 } |
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96 |
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97 static int aeApiResize(aeEventLoop *eventLoop, int setsize) { |
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98 /* Nothing to resize here. */ |
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99 return 0; |
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100 } |
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101 |
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102 static void aeApiFree(aeEventLoop *eventLoop) { |
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103 aeApiState *state = eventLoop->apidata; |
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104 |
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105 close(state->portfd); |
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106 zfree(state); |
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107 } |
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108 |
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109 static int aeApiLookupPending(aeApiState *state, int fd) { |
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110 int i; |
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111 |
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112 for (i = 0; i < state->npending; i++) { |
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113 if (state->pending_fds[i] == fd) |
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114 return (i); |
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115 } |
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116 |
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117 return (-1); |
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118 } |
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119 |
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120 /* |
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121 * Helper function to invoke port_associate for the given fd and mask. |
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122 */ |
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123 static int aeApiAssociate(const char *where, int portfd, int fd, int mask) { |
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124 int events = 0; |
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125 int rv, err; |
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126 |
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127 if (mask & AE_READABLE) |
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128 events |= POLLIN; |
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129 if (mask & AE_WRITABLE) |
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130 events |= POLLOUT; |
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131 |
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132 if (evport_debug) |
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133 fprintf(stderr, "%s: port_associate(%d, 0x%x) = ", where, fd, events); |
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134 |
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135 rv = port_associate(portfd, PORT_SOURCE_FD, fd, events, |
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136 (void *)(uintptr_t)mask); |
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137 err = errno; |
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138 |
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139 if (evport_debug) |
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140 fprintf(stderr, "%d (%s)\n", rv, rv == 0 ? "no error" : strerror(err)); |
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141 |
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142 if (rv == -1) { |
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143 fprintf(stderr, "%s: port_associate: %s\n", where, strerror(err)); |
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144 |
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145 if (err == EAGAIN) |
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146 fprintf(stderr, "aeApiAssociate: event port limit exceeded."); |
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147 } |
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148 |
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149 return rv; |
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150 } |
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151 |
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152 static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) { |
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153 aeApiState *state = eventLoop->apidata; |
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154 int fullmask, pfd; |
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155 |
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156 if (evport_debug) |
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157 fprintf(stderr, "aeApiAddEvent: fd %d mask 0x%x\n", fd, mask); |
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158 |
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159 /* |
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160 * Since port_associate's "events" argument replaces any existing events, we |
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161 * must be sure to include whatever events are already associated when |
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162 * we call port_associate() again. |
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163 */ |
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164 fullmask = mask | eventLoop->events[fd].mask; |
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165 pfd = aeApiLookupPending(state, fd); |
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166 |
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167 if (pfd != -1) { |
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168 /* |
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169 * This fd was recently returned from aeApiPoll. It should be safe to |
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170 * assume that the consumer has processed that poll event, but we play |
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171 * it safer by simply updating pending_mask. The fd will be |
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172 * re-associated as usual when aeApiPoll is called again. |
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173 */ |
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174 if (evport_debug) |
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175 fprintf(stderr, "aeApiAddEvent: adding to pending fd %d\n", fd); |
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176 state->pending_masks[pfd] |= fullmask; |
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177 return 0; |
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178 } |
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179 |
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180 return (aeApiAssociate("aeApiAddEvent", state->portfd, fd, fullmask)); |
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181 } |
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182 |
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183 static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) { |
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184 aeApiState *state = eventLoop->apidata; |
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185 int fullmask, pfd; |
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186 |
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187 if (evport_debug) |
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188 fprintf(stderr, "del fd %d mask 0x%x\n", fd, mask); |
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189 |
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190 pfd = aeApiLookupPending(state, fd); |
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191 |
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192 if (pfd != -1) { |
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193 if (evport_debug) |
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194 fprintf(stderr, "deleting event from pending fd %d\n", fd); |
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195 |
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196 /* |
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197 * This fd was just returned from aeApiPoll, so it's not currently |
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198 * associated with the port. All we need to do is update |
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199 * pending_mask appropriately. |
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200 */ |
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201 state->pending_masks[pfd] &= ~mask; |
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202 |
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203 if (state->pending_masks[pfd] == AE_NONE) |
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204 state->pending_fds[pfd] = -1; |
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205 |
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206 return; |
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207 } |
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208 |
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209 /* |
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210 * The fd is currently associated with the port. Like with the add case |
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211 * above, we must look at the full mask for the file descriptor before |
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212 * updating that association. We don't have a good way of knowing what the |
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213 * events are without looking into the eventLoop state directly. We rely on |
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214 * the fact that our caller has already updated the mask in the eventLoop. |
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215 */ |
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216 |
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217 fullmask = eventLoop->events[fd].mask; |
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218 if (fullmask == AE_NONE) { |
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219 /* |
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220 * We're removing *all* events, so use port_dissociate to remove the |
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221 * association completely. Failure here indicates a bug. |
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222 */ |
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223 if (evport_debug) |
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224 fprintf(stderr, "aeApiDelEvent: port_dissociate(%d)\n", fd); |
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225 |
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226 if (port_dissociate(state->portfd, PORT_SOURCE_FD, fd) != 0) { |
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227 perror("aeApiDelEvent: port_dissociate"); |
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228 abort(); /* will not return */ |
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229 } |
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230 } else if (aeApiAssociate("aeApiDelEvent", state->portfd, fd, |
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231 fullmask) != 0) { |
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232 /* |
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233 * ENOMEM is a potentially transient condition, but the kernel won't |
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234 * generally return it unless things are really bad. EAGAIN indicates |
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235 * we've reached an resource limit, for which it doesn't make sense to |
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236 * retry (counter-intuitively). All other errors indicate a bug. In any |
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237 * of these cases, the best we can do is to abort. |
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238 */ |
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239 abort(); /* will not return */ |
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240 } |
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241 } |
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242 |
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243 static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) { |
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244 aeApiState *state = eventLoop->apidata; |
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245 struct timespec timeout, *tsp; |
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246 int mask, i; |
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247 uint_t nevents; |
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248 port_event_t event[MAX_EVENT_BATCHSZ]; |
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249 |
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250 /* |
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251 * If we've returned fd events before, we must re-associate them with the |
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252 * port now, before calling port_get(). See the block comment at the top of |
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253 * this file for an explanation of why. |
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254 */ |
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255 for (i = 0; i < state->npending; i++) { |
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256 if (state->pending_fds[i] == -1) |
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257 /* This fd has since been deleted. */ |
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258 continue; |
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259 |
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260 if (aeApiAssociate("aeApiPoll", state->portfd, |
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261 state->pending_fds[i], state->pending_masks[i]) != 0) { |
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262 /* See aeApiDelEvent for why this case is fatal. */ |
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263 abort(); |
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264 } |
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265 |
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266 state->pending_masks[i] = AE_NONE; |
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267 state->pending_fds[i] = -1; |
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268 } |
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269 |
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270 state->npending = 0; |
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271 |
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272 if (tvp != NULL) { |
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273 timeout.tv_sec = tvp->tv_sec; |
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274 timeout.tv_nsec = tvp->tv_usec * 1000; |
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275 tsp = &timeout; |
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276 } else { |
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277 tsp = NULL; |
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278 } |
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279 |
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280 /* |
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281 * port_getn can return with errno == ETIME having returned some events (!). |
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282 * So if we get ETIME, we check nevents, too. |
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283 */ |
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284 nevents = 1; |
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285 if (port_getn(state->portfd, event, MAX_EVENT_BATCHSZ, &nevents, |
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286 tsp) == -1 && (errno != ETIME || nevents == 0)) { |
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287 if (errno == ETIME || errno == EINTR) |
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288 return 0; |
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289 |
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290 /* Any other error indicates a bug. */ |
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291 perror("aeApiPoll: port_get"); |
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292 abort(); |
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293 } |
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294 |
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295 state->npending = nevents; |
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296 |
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297 for (i = 0; i < nevents; i++) { |
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298 mask = 0; |
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299 if (event[i].portev_events & POLLIN) |
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300 mask |= AE_READABLE; |
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301 if (event[i].portev_events & POLLOUT) |
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302 mask |= AE_WRITABLE; |
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303 |
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304 eventLoop->fired[i].fd = event[i].portev_object; |
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305 eventLoop->fired[i].mask = mask; |
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306 |
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307 if (evport_debug) |
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308 fprintf(stderr, "aeApiPoll: fd %d mask 0x%x\n", |
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309 (int)event[i].portev_object, mask); |
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310 |
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311 state->pending_fds[i] = event[i].portev_object; |
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312 state->pending_masks[i] = (uintptr_t)event[i].portev_user; |
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313 } |
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314 |
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315 return nevents; |
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316 } |
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317 |
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318 static char *aeApiName(void) { |
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319 return "evport"; |
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320 } |