1 | // Copyright (c) 2012 by István Váradi
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2 |
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3 | // This file is part of libxplcommon, a common utility library for
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4 | // development related to X-Plane
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5 |
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6 | // Redistribution and use in source and binary forms, with or without
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7 | // modification, are permitted provided that the following conditions are met:
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8 |
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9 | // 1. Redistributions of source code must retain the above copyright notice, this
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10 | // list of conditions and the following disclaimer.
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11 | // 2. Redistributions in binary form must reproduce the above copyright notice,
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12 | // this list of conditions and the following disclaimer in the documentation
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13 | // and/or other materials provided with the distribution.
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14 |
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15 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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16 | // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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17 | // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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18 | // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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19 | // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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20 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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21 | // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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22 | // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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23 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 |
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26 | // The views and conclusions contained in the software and documentation are those
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27 | // of the authors and should not be interpreted as representing official policies,
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28 | // either expressed or implied, of the FreeBSD Project.
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29 |
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30 | //------------------------------------------------------------------------------
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31 |
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32 | #include "WaitableEvent.h"
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33 |
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34 | #include <cassert>
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35 | #include <cerrno>
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36 | #include <cstdio>
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37 |
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38 | #include <poll.h>
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39 | #include <unistd.h>
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40 |
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41 | #include <sys/eventfd.h>
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42 |
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43 | //------------------------------------------------------------------------------
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44 |
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45 | using xplcommon::posix::WaitableEvent;
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46 |
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47 | //------------------------------------------------------------------------------
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48 |
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49 | WaitableEvent::WaitableEvent(Waiter* waiter) :
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50 | Waitable(waiter, eventfd(0, (waiter==0) ? 0 : EFD_NONBLOCK), POLLIN),
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51 | fired(false)
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52 | {
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53 | assert(fd>=0);
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54 | }
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55 |
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56 | //------------------------------------------------------------------------------
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57 |
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58 | WaitableEvent::~WaitableEvent()
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59 | {
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60 | close(fd);
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61 | }
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62 |
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63 | //------------------------------------------------------------------------------
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64 |
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65 | void WaitableEvent::fire()
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66 | {
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67 | static const uint64_t one = 1;
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68 | if (write(fd, &one, sizeof(one))<0) {
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69 | if (errno!=EAGAIN) {
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70 | setErrorCode(errno);
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71 | }
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72 | }
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73 | }
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74 |
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75 | //------------------------------------------------------------------------------
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76 |
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77 | bool WaitableEvent::check()
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78 | {
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79 | if (doCheck()) {
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80 | fired = false;
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81 | return true;
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82 | } else {
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83 | return false;
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84 | }
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85 | }
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86 |
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87 | //------------------------------------------------------------------------------
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88 |
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89 | bool WaitableEvent::isReady()
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90 | {
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91 | return fired;
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92 | }
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93 |
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94 | //------------------------------------------------------------------------------
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95 |
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96 | void WaitableEvent::handleEvents(short events)
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97 | {
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98 | if ((events&POLLIN)==POLLIN) {
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99 | doCheck();
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100 | }
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101 | }
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102 |
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103 | //------------------------------------------------------------------------------
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104 |
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105 | bool WaitableEvent::doCheck(bool fromHandleEvents)
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106 | {
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107 | if (failed()) return false;
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108 | if (!fromHandleEvents && fired) return true;
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109 |
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110 | uint64_t value = 0;
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111 | if (read(fd, &value, sizeof(value))<0) {
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112 | if (errno!=EAGAIN) {
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113 | setErrorCode(errno);
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114 | }
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115 | } else {
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116 | fired = fired || value>0;
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117 | }
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118 |
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119 | return fired;
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120 | }
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121 |
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122 | //------------------------------------------------------------------------------
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123 | //------------------------------------------------------------------------------
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124 |
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125 | // Local Variables:
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126 | // mode: C++
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127 | // c-basic-offset: 4
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128 | // indent-tabs-mode: nil
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129 | // End:
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