1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // clib/cfathread.cfa -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Tue Sep 22 15:31:20 2020 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : |
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14 | // |
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15 | |
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16 | #define EPOLL_FOR_SOCKETS |
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17 | |
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18 | #include "fstream.hfa" |
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19 | #include "locks.hfa" |
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20 | #include "kernel.hfa" |
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21 | #include "stats.hfa" |
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22 | #include "thread.hfa" |
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23 | #include "time.hfa" |
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24 | |
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25 | #include "cfathread.h" |
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26 | |
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27 | extern "C" { |
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28 | #include <string.h> |
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29 | #include <errno.h> |
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30 | } |
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31 | |
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32 | extern void ?{}(processor &, const char[], cluster &, thread$ *); |
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33 | extern "C" { |
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34 | extern void __cfactx_invoke_thread(void (*main)(void *), void * this); |
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35 | extern int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); |
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36 | } |
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37 | |
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38 | extern Time __kernel_get_time(); |
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39 | extern unsigned register_proc_id( void ); |
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40 | |
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41 | //================================================================================ |
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42 | // Epoll support for sockets |
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43 | |
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44 | #if defined(EPOLL_FOR_SOCKETS) |
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45 | extern "C" { |
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46 | #include <sys/epoll.h> |
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47 | #include <sys/resource.h> |
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48 | } |
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49 | |
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50 | static pthread_t master_poller; |
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51 | static int master_epollfd = 0; |
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52 | static size_t poller_cnt = 0; |
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53 | static int * poller_fds = 0p; |
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54 | static struct leaf_poller * pollers = 0p; |
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55 | |
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56 | struct __attribute__((aligned)) fd_info_t { |
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57 | int pollid; |
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58 | size_t rearms; |
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59 | }; |
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60 | rlim_t fd_limit = 0; |
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61 | static fd_info_t * volatile * fd_map = 0p; |
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62 | |
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63 | void * master_epoll( __attribute__((unused)) void * args ) { |
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64 | unsigned id = register_proc_id(); |
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65 | |
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66 | enum { MAX_EVENTS = 5 }; |
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67 | struct epoll_event events[MAX_EVENTS]; |
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68 | for() { |
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69 | int ret = epoll_wait(master_epollfd, events, MAX_EVENTS, -1); |
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70 | if ( ret < 0 ) { |
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71 | abort | "Master epoll error: " | strerror(errno); |
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72 | } |
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73 | |
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74 | for(i; ret) { |
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75 | thread$ * thrd = (thread$ *)events[i].data.u64; |
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76 | unpark( thrd ); |
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77 | } |
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78 | } |
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79 | |
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80 | return 0p; |
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81 | } |
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82 | |
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83 | static inline int epoll_rearm(int epollfd, int fd, uint32_t event) { |
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84 | struct epoll_event eevent; |
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85 | eevent.events = event | EPOLLET | EPOLLONESHOT; |
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86 | eevent.data.u64 = (uint64_t)active_thread(); |
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87 | |
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88 | if(0 != epoll_ctl(epollfd, EPOLL_CTL_MOD, fd, &eevent)) |
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89 | { |
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90 | if(errno == ENOENT) return -1; |
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91 | abort | acquire | "epoll" | epollfd | "ctl rearm" | fd | "error: " | errno | strerror(errno); |
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92 | } |
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93 | |
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94 | park(); |
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95 | return 0; |
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96 | } |
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97 | |
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98 | thread leaf_poller { |
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99 | int epollfd; |
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100 | }; |
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101 | |
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102 | void ?{}(leaf_poller & this, int fd) { this.epollfd = fd; } |
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103 | |
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104 | void main(leaf_poller & this) { |
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105 | enum { MAX_EVENTS = 1024 }; |
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106 | struct epoll_event events[MAX_EVENTS]; |
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107 | const int max_retries = 5; |
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108 | int retries = max_retries; |
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109 | |
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110 | struct epoll_event event; |
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111 | event.events = EPOLLIN | EPOLLET | EPOLLONESHOT; |
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112 | event.data.u64 = (uint64_t)&(thread&)this; |
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113 | |
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114 | if(0 != epoll_ctl(master_epollfd, EPOLL_CTL_ADD, this.epollfd, &event)) |
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115 | { |
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116 | abort | "master epoll ctl add leaf: " | errno | strerror(errno); |
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117 | } |
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118 | |
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119 | park(); |
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120 | |
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121 | for() { |
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122 | yield(); |
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123 | int ret = epoll_wait(this.epollfd, events, MAX_EVENTS, 0); |
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124 | if ( ret < 0 ) { |
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125 | abort | "Leaf epoll error: " | errno | strerror(errno); |
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126 | } |
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127 | |
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128 | if(ret) { |
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129 | for(i; ret) { |
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130 | thread$ * thrd = (thread$ *)events[i].data.u64; |
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131 | unpark( thrd ); |
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132 | } |
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133 | } |
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134 | else if(0 >= --retries) { |
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135 | epoll_rearm(master_epollfd, this.epollfd, EPOLLIN); |
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136 | } |
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137 | } |
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138 | } |
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139 | |
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140 | void setup_epoll( void ) __attribute__(( constructor )); |
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141 | void setup_epoll( void ) { |
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142 | if(master_epollfd) abort | "Master epoll already setup"; |
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143 | |
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144 | master_epollfd = epoll_create1(0); |
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145 | if(master_epollfd == -1) { |
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146 | abort | "failed to create master epoll: " | errno | strerror(errno); |
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147 | } |
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148 | |
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149 | struct rlimit rlim; |
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150 | if(int ret = getrlimit(RLIMIT_NOFILE, &rlim); 0 != ret) { |
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151 | abort | "failed to get nofile limit: " | errno | strerror(errno); |
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152 | } |
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153 | |
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154 | fd_limit = rlim.rlim_cur; |
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155 | fd_map = alloc(fd_limit); |
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156 | for(i;fd_limit) { |
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157 | fd_map[i] = 0p; |
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158 | } |
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159 | |
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160 | poller_cnt = 24; |
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161 | poller_fds = alloc(poller_cnt); |
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162 | pollers = alloc(poller_cnt); |
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163 | for(i; poller_cnt) { |
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164 | poller_fds[i] = epoll_create1(0); |
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165 | if(poller_fds[i] == -1) { |
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166 | abort | "failed to create leaf epoll [" | i | "]: " | errno | strerror(errno); |
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167 | } |
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168 | |
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169 | (pollers[i]){ poller_fds[i] }; |
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170 | } |
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171 | |
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172 | pthread_attr_t attr; |
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173 | if (int ret = pthread_attr_init(&attr); 0 != ret) { |
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174 | abort | "failed to create master epoll thread attr: " | ret | strerror(ret); |
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175 | } |
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176 | |
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177 | if (int ret = pthread_create(&master_poller, &attr, master_epoll, 0p); 0 != ret) { |
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178 | abort | "failed to create master epoll thread: " | ret | strerror(ret); |
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179 | } |
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180 | } |
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181 | |
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182 | static inline int epoll_wait(int fd, uint32_t event) { |
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183 | if(fd_map[fd] >= 1p) { |
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184 | fd_map[fd]->rearms++; |
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185 | epoll_rearm(poller_fds[fd_map[fd]->pollid], fd, event); |
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186 | return 0; |
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187 | } |
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188 | |
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189 | for() { |
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190 | fd_info_t * expected = 0p; |
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191 | fd_info_t * sentinel = 1p; |
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192 | if(__atomic_compare_exchange_n( &(fd_map[fd]), &expected, sentinel, true, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED)) { |
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193 | struct epoll_event eevent; |
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194 | eevent.events = event | EPOLLET | EPOLLONESHOT; |
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195 | eevent.data.u64 = (uint64_t)active_thread(); |
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196 | |
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197 | int id = thread_rand() % poller_cnt; |
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198 | if(0 != epoll_ctl(poller_fds[id], EPOLL_CTL_ADD, fd, &eevent)) |
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199 | { |
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200 | abort | "epoll ctl add" | poller_fds[id] | fd | fd_map[fd] | expected | "error: " | errno | strerror(errno); |
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201 | } |
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202 | |
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203 | fd_info_t * ninfo = alloc(); |
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204 | ninfo->pollid = id; |
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205 | ninfo->rearms = 0; |
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206 | __atomic_store_n( &fd_map[fd], ninfo, __ATOMIC_SEQ_CST); |
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207 | |
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208 | park(); |
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209 | return 0; |
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210 | } |
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211 | |
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212 | if(expected >= 0) { |
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213 | fd_map[fd]->rearms++; |
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214 | epoll_rearm(poller_fds[fd_map[fd]->pollid], fd, event); |
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215 | return 0; |
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216 | } |
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217 | |
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218 | Pause(); |
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219 | } |
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220 | } |
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221 | #endif |
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222 | |
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223 | //================================================================================ |
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224 | // Thread run by the C Interface |
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225 | |
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226 | struct cfathread_object { |
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227 | thread$ self; |
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228 | void * (*themain)( void * ); |
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229 | void * arg; |
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230 | void * ret; |
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231 | }; |
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232 | void main(cfathread_object & this); |
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233 | void ^?{}(cfathread_object & mutex this); |
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234 | |
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235 | static inline thread$ * get_thread( cfathread_object & this ) { return &this.self; } |
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236 | |
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237 | typedef ThreadCancelled(cfathread_object) cfathread_exception; |
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238 | typedef ThreadCancelled_vtable(cfathread_object) cfathread_vtable; |
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239 | |
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240 | void defaultResumptionHandler(ThreadCancelled(cfathread_object) & except) { |
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241 | abort | "A thread was cancelled"; |
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242 | } |
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243 | |
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244 | cfathread_vtable _cfathread_vtable_instance; |
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245 | |
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246 | cfathread_vtable & const _default_vtable = _cfathread_vtable_instance; |
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247 | |
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248 | cfathread_vtable const & get_exception_vtable(cfathread_exception *) { |
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249 | return _cfathread_vtable_instance; |
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250 | } |
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251 | |
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252 | static void ?{}( cfathread_object & this, cluster & cl, void *(*themain)( void * ), void * arg ) { |
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253 | this.themain = themain; |
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254 | this.arg = arg; |
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255 | (this.self){"C-thread", cl}; |
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256 | __thrd_start(this, main); |
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257 | } |
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258 | |
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259 | void ^?{}(cfathread_object & mutex this) { |
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260 | ^(this.self){}; |
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261 | } |
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262 | |
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263 | void main( cfathread_object & this ) { |
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264 | __attribute__((unused)) void * const thrd_obj = (void*)&this; |
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265 | __attribute__((unused)) void * const thrd_hdl = (void*)active_thread(); |
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266 | /* paranoid */ verify( thrd_obj == thrd_hdl ); |
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267 | |
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268 | this.ret = this.themain( this.arg ); |
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269 | } |
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270 | |
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271 | //================================================================================ |
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272 | // Special Init Thread responsible for the initialization or processors |
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273 | struct __cfainit { |
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274 | thread$ self; |
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275 | void (*init)( void * ); |
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276 | void * arg; |
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277 | }; |
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278 | void main(__cfainit & this); |
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279 | void ^?{}(__cfainit & mutex this); |
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280 | |
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281 | static inline thread$ * get_thread( __cfainit & this ) { return &this.self; } |
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282 | |
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283 | typedef ThreadCancelled(__cfainit) __cfainit_exception; |
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284 | typedef ThreadCancelled_vtable(__cfainit) __cfainit_vtable; |
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285 | |
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286 | void defaultResumptionHandler(ThreadCancelled(__cfainit) & except) { |
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287 | abort | "The init thread was cancelled"; |
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288 | } |
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289 | |
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290 | __cfainit_vtable ___cfainit_vtable_instance; |
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291 | |
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292 | __cfainit_vtable const & get_exception_vtable(__cfainit_exception *) { |
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293 | return ___cfainit_vtable_instance; |
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294 | } |
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295 | |
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296 | static void ?{}( __cfainit & this, void (*init)( void * ), void * arg ) { |
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297 | this.init = init; |
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298 | this.arg = arg; |
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299 | (this.self){"Processir Init"}; |
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300 | |
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301 | // Don't use __thrd_start! just prep the context manually |
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302 | thread$ * this_thrd = get_thread(this); |
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303 | void (*main_p)(__cfainit &) = main; |
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304 | |
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305 | disable_interrupts(); |
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306 | __cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread); |
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307 | |
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308 | this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP]; |
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309 | /* paranoid */ verify( this_thrd->context.SP ); |
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310 | |
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311 | this_thrd->state = Ready; |
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312 | enable_interrupts(); |
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313 | } |
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314 | |
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315 | void ^?{}(__cfainit & mutex this) { |
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316 | ^(this.self){}; |
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317 | } |
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318 | |
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319 | void main( __cfainit & this ) { |
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320 | __attribute__((unused)) void * const thrd_obj = (void*)&this; |
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321 | __attribute__((unused)) void * const thrd_hdl = (void*)active_thread(); |
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322 | /* paranoid */ verify( thrd_obj == thrd_hdl ); |
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323 | |
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324 | this.init( this.arg ); |
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325 | } |
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326 | |
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327 | //================================================================================ |
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328 | // Main Api |
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329 | extern "C" { |
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330 | int cfathread_cluster_create(cfathread_cluster_t * cl) __attribute__((nonnull(1))) { |
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331 | *cl = new(); |
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332 | return 0; |
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333 | } |
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334 | |
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335 | cfathread_cluster_t cfathread_cluster_self(void) { |
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336 | return active_cluster(); |
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337 | } |
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338 | |
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339 | int cfathread_cluster_print_stats( cfathread_cluster_t cl ) { |
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340 | #if !defined(__CFA_NO_STATISTICS__) |
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341 | print_stats_at_exit( *cl, CFA_STATS_READY_Q | CFA_STATS_IO ); |
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342 | print_stats_now( *cl, CFA_STATS_READY_Q | CFA_STATS_IO ); |
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343 | #endif |
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344 | return 0; |
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345 | } |
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346 | |
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347 | int cfathread_cluster_add_worker(cfathread_cluster_t cl, pthread_t* tid, void (*init_routine) (void *), void * arg) { |
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348 | __cfainit * it = 0p; |
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349 | if(init_routine) { |
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350 | it = alloc(); |
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351 | (*it){init_routine, arg}; |
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352 | } |
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353 | processor * proc = alloc(); |
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354 | (*proc){ "C-processor", *cl, get_thread(*it) }; |
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355 | |
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356 | // Wait for the init thread to return before continuing |
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357 | if(it) { |
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358 | ^(*it){}; |
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359 | free(it); |
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360 | } |
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361 | |
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362 | if(tid) *tid = proc->kernel_thread; |
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363 | return 0; |
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364 | } |
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365 | |
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366 | int cfathread_cluster_pause (cfathread_cluster_t) { |
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367 | abort | "Pausing clusters is not supported"; |
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368 | exit(1); |
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369 | } |
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370 | |
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371 | int cfathread_cluster_resume(cfathread_cluster_t) { |
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372 | abort | "Resuming clusters is not supported"; |
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373 | exit(1); |
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374 | } |
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375 | |
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376 | //-------------------- |
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377 | // Thread attributes |
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378 | int cfathread_attr_init(cfathread_attr_t *attr) __attribute__((nonnull (1))) { |
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379 | attr->cl = active_cluster(); |
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380 | return 0; |
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381 | } |
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382 | |
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383 | //-------------------- |
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384 | // Thread |
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385 | int cfathread_create( cfathread_t * handle, const cfathread_attr_t * attr, void *(*main)( void * ), void * arg ) __attribute__((nonnull (1))) { |
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386 | cluster * cl = attr ? attr->cl : active_cluster(); |
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387 | cfathread_t thrd = alloc(); |
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388 | (*thrd){ *cl, main, arg }; |
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389 | *handle = thrd; |
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390 | return 0; |
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391 | } |
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392 | |
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393 | int cfathread_join( cfathread_t thrd, void ** retval ) { |
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394 | void * ret = join( *thrd ).ret; |
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395 | ^( *thrd ){}; |
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396 | free(thrd); |
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397 | if(retval) { |
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398 | *retval = ret; |
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399 | } |
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400 | return 0; |
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401 | } |
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402 | |
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403 | int cfathread_get_errno(void) { |
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404 | return errno; |
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405 | } |
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406 | |
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407 | cfathread_t cfathread_self(void) { |
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408 | return (cfathread_t)active_thread(); |
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409 | } |
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410 | |
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411 | int cfathread_usleep(useconds_t usecs) { |
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412 | sleep(usecs`us); |
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413 | return 0; |
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414 | } |
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415 | |
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416 | int cfathread_sleep(unsigned int secs) { |
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417 | sleep(secs`s); |
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418 | return 0; |
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419 | } |
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420 | |
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421 | void cfathread_park( void ) { |
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422 | park(); |
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423 | } |
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424 | |
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425 | void cfathread_unpark( cfathread_t thrd ) { |
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426 | unpark( *thrd ); |
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427 | } |
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428 | |
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429 | void cfathread_yield( void ) { |
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430 | yield(); |
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431 | } |
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432 | |
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433 | typedef struct cfathread_mutex * cfathread_mutex_t; |
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434 | |
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435 | //-------------------- |
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436 | // Mutex |
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437 | struct cfathread_mutex { |
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438 | linear_backoff_then_block_lock impl; |
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439 | }; |
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440 | int cfathread_mutex_init(cfathread_mutex_t *restrict mut, const cfathread_mutexattr_t *restrict) __attribute__((nonnull (1))) { *mut = new(); return 0; } |
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441 | int cfathread_mutex_destroy(cfathread_mutex_t *mut) __attribute__((nonnull (1))) { delete( *mut ); return 0; } |
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442 | int cfathread_mutex_lock (cfathread_mutex_t *mut) __attribute__((nonnull (1))) { lock( (*mut)->impl ); return 0; } |
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443 | int cfathread_mutex_unlock (cfathread_mutex_t *mut) __attribute__((nonnull (1))) { unlock( (*mut)->impl ); return 0; } |
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444 | int cfathread_mutex_trylock(cfathread_mutex_t *mut) __attribute__((nonnull (1))) { |
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445 | bool ret = try_lock( (*mut)->impl ); |
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446 | if( ret ) return 0; |
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447 | else return EBUSY; |
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448 | } |
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449 | |
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450 | //-------------------- |
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451 | // Condition |
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452 | struct cfathread_condition { |
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453 | condition_variable(linear_backoff_then_block_lock) impl; |
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454 | }; |
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455 | int cfathread_cond_init(cfathread_cond_t *restrict cond, const cfathread_condattr_t *restrict) __attribute__((nonnull (1))) { *cond = new(); return 0; } |
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456 | int cfathread_cond_signal(cfathread_cond_t *cond) __attribute__((nonnull (1))) { notify_one( (*cond)->impl ); return 0; } |
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457 | int cfathread_cond_wait(cfathread_cond_t *restrict cond, cfathread_mutex_t *restrict mut) __attribute__((nonnull (1,2))) { wait( (*cond)->impl, (*mut)->impl ); return 0; } |
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458 | int cfathread_cond_timedwait(cfathread_cond_t *restrict cond, cfathread_mutex_t *restrict mut, const struct timespec *restrict abstime) __attribute__((nonnull (1,2,3))) { |
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459 | Time t = { *abstime }; |
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460 | timespec curr; |
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461 | clock_gettime( CLOCK_REALTIME, &curr ); |
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462 | Time c = { curr }; |
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463 | if( wait( (*cond)->impl, (*mut)->impl, t - c ) ) { |
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464 | return 0; |
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465 | } |
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466 | errno = ETIMEDOUT; |
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467 | return ETIMEDOUT; |
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468 | } |
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469 | } |
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470 | |
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471 | #include <iofwd.hfa> |
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472 | |
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473 | extern "C" { |
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474 | #include <unistd.h> |
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475 | #include <sys/types.h> |
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476 | #include <sys/socket.h> |
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477 | |
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478 | //-------------------- |
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479 | // IO operations |
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480 | int cfathread_socket(int domain, int type, int protocol) { |
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481 | return socket(domain, type |
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482 | #if defined(EPOLL_FOR_SOCKETS) |
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483 | | SOCK_NONBLOCK |
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484 | #endif |
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485 | , protocol); |
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486 | } |
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487 | int cfathread_bind(int socket, const struct sockaddr *address, socklen_t address_len) { |
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488 | return bind(socket, address, address_len); |
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489 | } |
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490 | |
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491 | int cfathread_listen(int socket, int backlog) { |
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492 | return listen(socket, backlog); |
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493 | } |
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494 | |
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495 | int cfathread_accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len) { |
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496 | #if defined(EPOLL_FOR_SOCKETS) |
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497 | int ret; |
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498 | for() { |
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499 | yield(); |
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500 | ret = accept4(socket, address, address_len, SOCK_NONBLOCK); |
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501 | if(ret >= 0) break; |
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502 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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503 | |
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504 | epoll_wait(socket, EPOLLIN); |
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505 | } |
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506 | return ret; |
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507 | #else |
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508 | return cfa_accept4(socket, address, address_len, 0, CFA_IO_LAZY); |
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509 | #endif |
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510 | } |
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511 | |
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512 | int cfathread_connect(int socket, const struct sockaddr *address, socklen_t address_len) { |
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513 | #if defined(EPOLL_FOR_SOCKETS) |
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514 | int ret; |
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515 | for() { |
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516 | ret = connect(socket, address, address_len); |
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517 | if(ret >= 0) break; |
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518 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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519 | |
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520 | epoll_wait(socket, EPOLLIN); |
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521 | } |
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522 | return ret; |
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523 | #else |
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524 | return cfa_connect(socket, address, address_len, CFA_IO_LAZY); |
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525 | #endif |
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526 | } |
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527 | |
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528 | int cfathread_dup(int fildes) { |
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529 | return dup(fildes); |
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530 | } |
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531 | |
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532 | int cfathread_close(int fildes) { |
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533 | return cfa_close(fildes, CFA_IO_LAZY); |
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534 | } |
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535 | |
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536 | ssize_t cfathread_sendmsg(int socket, const struct msghdr *message, int flags) { |
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537 | #if defined(EPOLL_FOR_SOCKETS) |
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538 | ssize_t ret; |
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539 | __STATS__( false, io.ops.sockwrite++; ) |
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540 | for() { |
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541 | ret = sendmsg(socket, message, flags); |
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542 | if(ret >= 0) break; |
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543 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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544 | |
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545 | __STATS__( false, io.ops.epllwrite++; ) |
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546 | epoll_wait(socket, EPOLLOUT); |
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547 | } |
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548 | #else |
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549 | ssize_t ret = cfa_sendmsg(socket, message, flags, CFA_IO_LAZY); |
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550 | #endif |
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551 | return ret; |
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552 | } |
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553 | |
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554 | ssize_t cfathread_write(int fildes, const void *buf, size_t nbyte) { |
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555 | // Use send rather then write for socket since it's faster |
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556 | #if defined(EPOLL_FOR_SOCKETS) |
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557 | ssize_t ret; |
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558 | // __STATS__( false, io.ops.sockwrite++; ) |
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559 | for() { |
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560 | ret = send(fildes, buf, nbyte, 0); |
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561 | if(ret >= 0) break; |
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562 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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563 | |
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564 | // __STATS__( false, io.ops.epllwrite++; ) |
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565 | epoll_wait(fildes, EPOLLOUT); |
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566 | } |
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567 | #else |
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568 | ssize_t ret = cfa_send(fildes, buf, nbyte, 0, CFA_IO_LAZY); |
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569 | #endif |
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570 | return ret; |
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571 | } |
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572 | |
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573 | ssize_t cfathread_recvfrom(int socket, void *restrict buffer, size_t length, int flags, struct sockaddr *restrict address, socklen_t *restrict address_len) { |
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574 | struct iovec iov; |
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575 | iov.iov_base = buffer; |
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576 | iov.iov_len = length; |
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577 | |
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578 | struct msghdr msg; |
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579 | msg.msg_name = address; |
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580 | msg.msg_namelen = address_len ? (socklen_t)*address_len : (socklen_t)0; |
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581 | msg.msg_iov = &iov; |
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582 | msg.msg_iovlen = 1; |
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583 | msg.msg_control = 0p; |
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584 | msg.msg_controllen = 0; |
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585 | |
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586 | #if defined(EPOLL_FOR_SOCKETS) |
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587 | ssize_t ret; |
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588 | yield(); |
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589 | for() { |
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590 | ret = recvmsg(socket, &msg, flags); |
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591 | if(ret >= 0) break; |
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592 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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593 | |
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594 | epoll_wait(socket, EPOLLIN); |
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595 | } |
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596 | #else |
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597 | ssize_t ret = cfa_recvmsg(socket, &msg, flags, CFA_IO_LAZY); |
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598 | #endif |
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599 | |
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600 | if(address_len) *address_len = msg.msg_namelen; |
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601 | return ret; |
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602 | } |
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603 | |
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604 | ssize_t cfathread_read(int fildes, void *buf, size_t nbyte) { |
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605 | // Use recv rather then read for socket since it's faster |
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606 | #if defined(EPOLL_FOR_SOCKETS) |
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607 | ssize_t ret; |
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608 | __STATS__( false, io.ops.sockread++; ) |
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609 | yield(); |
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610 | for() { |
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611 | ret = recv(fildes, buf, nbyte, 0); |
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612 | if(ret >= 0) break; |
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613 | if(errno != EAGAIN && errno != EWOULDBLOCK) break; |
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614 | |
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615 | __STATS__( false, io.ops.epllread++; ) |
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616 | epoll_wait(fildes, EPOLLIN); |
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617 | } |
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618 | #else |
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619 | ssize_t ret = cfa_recv(fildes, buf, nbyte, 0, CFA_IO_LAZY); |
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620 | #endif |
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621 | return ret; |
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622 | } |
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623 | |
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624 | } |
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