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50 | * limits the applicability over poll, so this is not a generic |
50 | * limits the applicability over poll, so this is not a generic |
51 | * poll replacement. |
51 | * poll replacement. |
52 | * |
52 | * |
53 | * lots of "weird code" and complication handling in this file is due |
53 | * lots of "weird code" and complication handling in this file is due |
54 | * to these design problems with epoll, as we try very hard to avoid |
54 | * to these design problems with epoll, as we try very hard to avoid |
55 | * epoll_ctl syscalls for common usage patterns. |
55 | * epoll_ctl syscalls for common usage patterns and handle the breakage |
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56 | * ensuing from receiving events for closed and otherwise long gone |
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57 | * file descriptors. |
56 | */ |
58 | */ |
57 | |
59 | |
58 | #include <sys/epoll.h> |
60 | #include <sys/epoll.h> |
59 | |
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60 | void inline_size |
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61 | unsigned_char_init (unsigned char *base, int count) |
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62 | { |
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63 | /* memset might be overkill */ |
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64 | while (count--) |
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65 | *base++ = 0; |
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66 | } |
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67 | |
61 | |
68 | static void |
62 | static void |
69 | epoll_modify (EV_P_ int fd, int oev, int nev) |
63 | epoll_modify (EV_P_ int fd, int oev, int nev) |
70 | { |
64 | { |
71 | struct epoll_event ev; |
65 | struct epoll_event ev; |
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136 | |
130 | |
137 | for (i = 0; i < eventcnt; ++i) |
131 | for (i = 0; i < eventcnt; ++i) |
138 | { |
132 | { |
139 | struct epoll_event *ev = epoll_events + i; |
133 | struct epoll_event *ev = epoll_events + i; |
140 | |
134 | |
141 | int fd = (uint32_t)ev->data.u64; /* mask out the lower 32 bits */ |
135 | int fd = (uint32_t)ev->data.u64; /* mask out the lower 32 bits */ |
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136 | int want = anfds [fd].events; |
142 | int got = (ev->events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
137 | int got = (ev->events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
143 | | (ev->events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0); |
138 | | (ev->events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0); |
144 | int want = anfds [fd].events; |
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145 | |
139 | |
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140 | /* check for spurious notification */ |
146 | if (anfds [fd].egen != (unsigned char)(ev->data.u64 >> 32)) |
141 | if (expect_false (anfds [fd].egen != (unsigned char)(ev->data.u64 >> 32))) |
147 | /*fprintf (stderr, "spurious notification fd %d, %d vs %d\n", fd, (int)(ev->data.u64 >> 32), anfds [fd].egen);*/ |
142 | { |
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143 | /* recreate kernel state */ |
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144 | postfork = 1; |
148 | continue; |
145 | continue; |
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146 | } |
149 | |
147 | |
150 | if (expect_false (got & ~want)) |
148 | if (expect_false (got & ~want)) |
151 | { |
149 | { |
152 | anfds [fd].emask = want; |
150 | anfds [fd].emask = want; |
153 | |
151 | |
154 | /* we received an event but are not interested in it, try mod or del */ |
152 | /* we received an event but are not interested in it, try mod or del */ |
155 | /* I don't think we ever need MOD, but let's handle it anyways */ |
153 | /* I don't think we ever need MOD, but let's handle it anyways */ |
156 | ev->events = (want & EV_READ ? EPOLLIN : 0) |
154 | ev->events = (want & EV_READ ? EPOLLIN : 0) |
157 | | (want & EV_WRITE ? EPOLLOUT : 0); |
155 | | (want & EV_WRITE ? EPOLLOUT : 0); |
158 | |
156 | |
159 | epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev); |
157 | if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev)) |
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158 | { |
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159 | postfork = 1; /* an error occured, recreate kernel state */ |
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160 | continue; |
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161 | } |
160 | } |
162 | } |
161 | |
163 | |
162 | fd_event (EV_A_ fd, got); |
164 | fd_event (EV_A_ fd, got); |
163 | } |
165 | } |
164 | |
166 | |
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183 | |
185 | |
184 | backend_fudge = 0.; /* kernel sources seem to indicate this to be zero */ |
186 | backend_fudge = 0.; /* kernel sources seem to indicate this to be zero */ |
185 | backend_modify = epoll_modify; |
187 | backend_modify = epoll_modify; |
186 | backend_poll = epoll_poll; |
188 | backend_poll = epoll_poll; |
187 | |
189 | |
188 | epoll_eventmax = 64; /* intiial number of events receivable per poll */ |
190 | epoll_eventmax = 64; /* initial number of events receivable per poll */ |
189 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
191 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
190 | |
192 | |
191 | return EVBACKEND_EPOLL; |
193 | return EVBACKEND_EPOLL; |
192 | } |
194 | } |
193 | |
195 | |