… | |
… | |
91 | /*****************************************************************************/ |
91 | /*****************************************************************************/ |
92 | /* syscall wrapdadoop - this section has the raw api/abi definitions */ |
92 | /* syscall wrapdadoop - this section has the raw api/abi definitions */ |
93 | |
93 | |
94 | #include <sys/syscall.h> /* no glibc wrappers */ |
94 | #include <sys/syscall.h> /* no glibc wrappers */ |
95 | |
95 | |
96 | /* aio_abi.h is not versioned in any way, so we cannot test for its existance */ |
96 | /* aio_abi.h is not versioned in any way, so we cannot test for its existence */ |
97 | #define IOCB_CMD_POLL 5 |
97 | #define IOCB_CMD_POLL 5 |
98 | |
98 | |
99 | /* taken from linux/fs/aio.c. yup, that's a .c file. |
99 | /* taken from linux/fs/aio.c. yup, that's a .c file. |
100 | * not only is this totally undocumented, not even the source code |
100 | * not only is this totally undocumented, not even the source code |
101 | * can tell you what the future semantics of compat_features and |
101 | * can tell you what the future semantics of compat_features and |
… | |
… | |
115 | unsigned incompat_features; |
115 | unsigned incompat_features; |
116 | unsigned header_length; /* size of aio_ring */ |
116 | unsigned header_length; /* size of aio_ring */ |
117 | |
117 | |
118 | struct io_event io_events[0]; |
118 | struct io_event io_events[0]; |
119 | }; |
119 | }; |
120 | |
|
|
121 | /* |
|
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122 | * define some syscall wrappers for common architectures |
|
|
123 | * this is mostly for nice looks during debugging, not performance. |
|
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124 | * our syscalls return < 0, not == -1, on error. which is good |
|
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125 | * enough for linux aio. |
|
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126 | * TODO: arm is also common nowadays, maybe even mips and x86 |
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127 | * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove... |
|
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128 | */ |
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129 | #if __GNUC__ && __linux && ECB_AMD64 && !defined __OPTIMIZE_SIZE__ |
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130 | /* the costly errno access probably kills this for size optimisation */ |
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131 | |
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132 | #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5) \ |
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133 | ({ \ |
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134 | long res; \ |
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135 | register unsigned long r5 __asm__ ("r8" ); \ |
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136 | register unsigned long r4 __asm__ ("r10"); \ |
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137 | register unsigned long r3 __asm__ ("rdx"); \ |
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138 | register unsigned long r2 __asm__ ("rsi"); \ |
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139 | register unsigned long r1 __asm__ ("rdi"); \ |
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140 | if (narg >= 5) r5 = (unsigned long)(arg5); \ |
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141 | if (narg >= 4) r4 = (unsigned long)(arg4); \ |
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142 | if (narg >= 3) r3 = (unsigned long)(arg3); \ |
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143 | if (narg >= 2) r2 = (unsigned long)(arg2); \ |
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144 | if (narg >= 1) r1 = (unsigned long)(arg1); \ |
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145 | __asm__ __volatile__ ( \ |
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146 | "syscall\n\t" \ |
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147 | : "=a" (res) \ |
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148 | : "0" (nr), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5) \ |
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149 | : "cc", "r11", "cx", "memory"); \ |
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150 | errno = -res; \ |
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151 | res; \ |
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152 | }) |
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153 | |
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154 | #endif |
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155 | |
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156 | #ifdef ev_syscall |
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157 | #define ev_syscall0(nr) ev_syscall (nr, 0, 0, 0, 0, 0, 0 |
|
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158 | #define ev_syscall1(nr,arg1) ev_syscall (nr, 1, arg1, 0, 0, 0, 0) |
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159 | #define ev_syscall2(nr,arg1,arg2) ev_syscall (nr, 2, arg1, arg2, 0, 0, 0) |
|
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160 | #define ev_syscall3(nr,arg1,arg2,arg3) ev_syscall (nr, 3, arg1, arg2, arg3, 0, 0) |
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161 | #define ev_syscall4(nr,arg1,arg2,arg3,arg4) ev_syscall (nr, 3, arg1, arg2, arg3, arg4, 0) |
|
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162 | #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5) ev_syscall (nr, 5, arg1, arg2, arg3, arg4, arg5) |
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163 | #else |
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164 | #define ev_syscall0(nr) syscall (nr) |
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165 | #define ev_syscall1(nr,arg1) syscall (nr, arg1) |
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166 | #define ev_syscall2(nr,arg1,arg2) syscall (nr, arg1, arg2) |
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167 | #define ev_syscall3(nr,arg1,arg2,arg3) syscall (nr, arg1, arg2, arg3) |
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168 | #define ev_syscall4(nr,arg1,arg2,arg3,arg4) syscall (nr, arg1, arg2, arg3, arg4) |
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169 | #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5) syscall (nr, arg1, arg2, arg3, arg4, arg5) |
|
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170 | #endif |
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171 | |
120 | |
172 | inline_size |
121 | inline_size |
173 | int |
122 | int |
174 | evsys_io_setup (unsigned nr_events, aio_context_t *ctx_idp) |
123 | evsys_io_setup (unsigned nr_events, aio_context_t *ctx_idp) |
175 | { |
124 | { |
… | |
… | |
263 | * this is not well documented, so we better do it. |
212 | * this is not well documented, so we better do it. |
264 | */ |
213 | */ |
265 | memset (iocb, 0, sizeof (*iocb)); |
214 | memset (iocb, 0, sizeof (*iocb)); |
266 | |
215 | |
267 | iocb->io.aio_lio_opcode = IOCB_CMD_POLL; |
216 | iocb->io.aio_lio_opcode = IOCB_CMD_POLL; |
268 | iocb->io.aio_data = offset; |
|
|
269 | iocb->io.aio_fildes = offset; |
217 | iocb->io.aio_fildes = offset; |
270 | |
218 | |
271 | base [offset++] = iocb; |
219 | base [offset++] = iocb; |
272 | } |
220 | } |
273 | } |
221 | } |
… | |
… | |
285 | static void |
233 | static void |
286 | linuxaio_modify (EV_P_ int fd, int oev, int nev) |
234 | linuxaio_modify (EV_P_ int fd, int oev, int nev) |
287 | { |
235 | { |
288 | array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp); |
236 | array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp); |
289 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
237 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
|
|
238 | ANFD *anfd = &anfds [fd]; |
290 | |
239 | |
291 | if (iocb->io.aio_reqprio < 0) |
240 | if (ecb_expect_false (iocb->io.aio_reqprio < 0)) |
292 | { |
241 | { |
293 | /* we handed this fd over to epoll, so undo this first */ |
242 | /* we handed this fd over to epoll, so undo this first */ |
294 | /* we do it manually because the optimisations on epoll_modify won't do us any good */ |
243 | /* we do it manually because the optimisations on epoll_modify won't do us any good */ |
295 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
244 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
296 | anfds [fd].emask = 0; |
245 | anfd->emask = 0; |
297 | iocb->io.aio_reqprio = 0; |
246 | iocb->io.aio_reqprio = 0; |
298 | } |
247 | } |
299 | |
248 | else if (ecb_expect_false (iocb->io.aio_buf)) |
300 | if (iocb->io.aio_buf) |
|
|
301 | { |
249 | { |
|
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250 | /* iocb active, so cancel it first before resubmit */ |
|
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251 | /* this assumes we only ever get one call per fd per loop iteration */ |
|
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252 | for (;;) |
|
|
253 | { |
|
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254 | /* on all relevant kernels, io_cancel fails with EINPROGRESS on "success" */ |
302 | evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0); |
255 | if (ecb_expect_false (evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0) == 0)) |
303 | /* on relevant kernels, io_cancel fails with EINPROGRES if everything is fine */ |
256 | break; |
|
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257 | |
|
|
258 | if (ecb_expect_true (errno == EINPROGRESS)) |
|
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259 | break; |
|
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260 | |
|
|
261 | /* the EINPROGRESS test is for nicer error message. clumsy. */ |
|
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262 | if (errno != EINTR) |
|
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263 | { |
304 | assert (("libev: linuxaio unexpected io_cancel failed", errno == EINPROGRESS)); |
264 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINTR && errno != EINPROGRESS)); |
|
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265 | break; |
|
|
266 | } |
305 | } |
267 | } |
|
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268 | |
|
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269 | /* increment generation counter to avoid handling old events */ |
|
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270 | ++anfd->egen; |
|
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271 | } |
|
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272 | |
|
|
273 | iocb->io.aio_buf = (nev & EV_READ ? POLLIN : 0) |
|
|
274 | | (nev & EV_WRITE ? POLLOUT : 0); |
306 | |
275 | |
307 | if (nev) |
276 | if (nev) |
308 | { |
277 | { |
309 | iocb->io.aio_buf = |
278 | iocb->io.aio_data = (uint32_t)fd | ((__u64)(uint32_t)anfd->egen << 32); |
310 | (nev & EV_READ ? POLLIN : 0) |
|
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311 | | (nev & EV_WRITE ? POLLOUT : 0); |
|
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312 | |
279 | |
313 | /* queue iocb up for io_submit */ |
280 | /* queue iocb up for io_submit */ |
314 | /* this assumes we only ever get one call per fd per loop iteration */ |
281 | /* this assumes we only ever get one call per fd per loop iteration */ |
315 | ++linuxaio_submitcnt; |
282 | ++linuxaio_submitcnt; |
316 | array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit); |
283 | array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit); |
… | |
… | |
336 | static void |
303 | static void |
337 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
304 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
338 | { |
305 | { |
339 | while (nr) |
306 | while (nr) |
340 | { |
307 | { |
341 | int fd = ev->data; |
308 | int fd = ev->data & 0xffffffff; |
|
|
309 | uint32_t gen = ev->data >> 32; |
342 | int res = ev->res; |
310 | int res = ev->res; |
343 | |
311 | |
344 | assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax)); |
312 | assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax)); |
345 | |
313 | |
|
|
314 | /* only accept events if generation counter matches */ |
|
|
315 | if (ecb_expect_true (gen == (uint32_t)anfds [fd].egen)) |
|
|
316 | { |
346 | /* feed events, we do not expect or handle POLLNVAL */ |
317 | /* feed events, we do not expect or handle POLLNVAL */ |
347 | fd_event ( |
318 | fd_event ( |
348 | EV_A_ |
319 | EV_A_ |
349 | fd, |
320 | fd, |
350 | (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
321 | (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
351 | | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
322 | | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
352 | ); |
323 | ); |
353 | |
324 | |
354 | /* linux aio is oneshot: rearm fd. TODO: this does more work than strictly needed */ |
325 | /* linux aio is oneshot: rearm fd. TODO: this does more work than strictly needed */ |
355 | linuxaio_fd_rearm (EV_A_ fd); |
326 | linuxaio_fd_rearm (EV_A_ fd); |
|
|
327 | } |
356 | |
328 | |
357 | --nr; |
329 | --nr; |
358 | ++ev; |
330 | ++ev; |
359 | } |
331 | } |
360 | } |
332 | } |
… | |
… | |
362 | /* get any events from ring buffer, return true if any were handled */ |
334 | /* get any events from ring buffer, return true if any were handled */ |
363 | static int |
335 | static int |
364 | linuxaio_get_events_from_ring (EV_P) |
336 | linuxaio_get_events_from_ring (EV_P) |
365 | { |
337 | { |
366 | struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx; |
338 | struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx; |
|
|
339 | unsigned head, tail; |
367 | |
340 | |
368 | /* the kernel reads and writes both of these variables, */ |
341 | /* the kernel reads and writes both of these variables, */ |
369 | /* as a C extension, we assume that volatile use here */ |
342 | /* as a C extension, we assume that volatile use here */ |
370 | /* both makes reads atomic and once-only */ |
343 | /* both makes reads atomic and once-only */ |
371 | unsigned head = *(volatile unsigned *)&ring->head; |
344 | head = *(volatile unsigned *)&ring->head; |
|
|
345 | ECB_MEMORY_FENCE_ACQUIRE; |
372 | unsigned tail = *(volatile unsigned *)&ring->tail; |
346 | tail = *(volatile unsigned *)&ring->tail; |
373 | |
347 | |
374 | if (head == tail) |
348 | if (head == tail) |
375 | return 0; |
349 | return 0; |
376 | |
350 | |
377 | /* make sure the events up to tail are visible */ |
|
|
378 | ECB_MEMORY_FENCE_ACQUIRE; |
|
|
379 | |
|
|
380 | /* parse all available events, but only once, to avoid starvation */ |
351 | /* parse all available events, but only once, to avoid starvation */ |
381 | if (tail > head) /* normal case around */ |
352 | if (ecb_expect_true (tail > head)) /* normal case around */ |
382 | linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head); |
353 | linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head); |
383 | else /* wrapped around */ |
354 | else /* wrapped around */ |
384 | { |
355 | { |
385 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
356 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
386 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
357 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
… | |
… | |
397 | int |
368 | int |
398 | linuxaio_ringbuf_valid (EV_P) |
369 | linuxaio_ringbuf_valid (EV_P) |
399 | { |
370 | { |
400 | struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx; |
371 | struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx; |
401 | |
372 | |
402 | return expect_true (ring->magic == AIO_RING_MAGIC) |
373 | return ecb_expect_true (ring->magic == AIO_RING_MAGIC) |
403 | && ring->incompat_features == EV_AIO_RING_INCOMPAT_FEATURES |
374 | && ring->incompat_features == EV_AIO_RING_INCOMPAT_FEATURES |
404 | && ring->header_length == sizeof (struct aio_ring); /* TODO: or use it to find io_event[0]? */ |
375 | && ring->header_length == sizeof (struct aio_ring); /* TODO: or use it to find io_event[0]? */ |
405 | } |
376 | } |
406 | |
377 | |
407 | /* read at least one event from kernel, or timeout */ |
378 | /* read at least one event from kernel, or timeout */ |
… | |
… | |
412 | struct timespec ts; |
383 | struct timespec ts; |
413 | struct io_event ioev[8]; /* 256 octet stack space */ |
384 | struct io_event ioev[8]; /* 256 octet stack space */ |
414 | int want = 1; /* how many events to request */ |
385 | int want = 1; /* how many events to request */ |
415 | int ringbuf_valid = linuxaio_ringbuf_valid (EV_A); |
386 | int ringbuf_valid = linuxaio_ringbuf_valid (EV_A); |
416 | |
387 | |
417 | if (expect_true (ringbuf_valid)) |
388 | if (ecb_expect_true (ringbuf_valid)) |
418 | { |
389 | { |
419 | /* if the ring buffer has any events, we don't wait or call the kernel at all */ |
390 | /* if the ring buffer has any events, we don't wait or call the kernel at all */ |
420 | if (linuxaio_get_events_from_ring (EV_A)) |
391 | if (linuxaio_get_events_from_ring (EV_A)) |
421 | return; |
392 | return; |
422 | |
393 | |
… | |
… | |
435 | { |
406 | { |
436 | int res; |
407 | int res; |
437 | |
408 | |
438 | EV_RELEASE_CB; |
409 | EV_RELEASE_CB; |
439 | |
410 | |
440 | ts.tv_sec = (long)timeout; |
411 | EV_TS_SET (ts, timeout); |
441 | ts.tv_nsec = (long)((timeout - ts.tv_sec) * 1e9); |
|
|
442 | |
|
|
443 | res = evsys_io_getevents (linuxaio_ctx, 1, want, ioev, &ts); |
412 | res = evsys_io_getevents (linuxaio_ctx, 1, want, ioev, &ts); |
444 | |
413 | |
445 | EV_ACQUIRE_CB; |
414 | EV_ACQUIRE_CB; |
446 | |
415 | |
447 | if (res < 0) |
416 | if (res < 0) |
… | |
… | |
452 | else if (res) |
421 | else if (res) |
453 | { |
422 | { |
454 | /* at least one event available, handle them */ |
423 | /* at least one event available, handle them */ |
455 | linuxaio_parse_events (EV_A_ ioev, res); |
424 | linuxaio_parse_events (EV_A_ ioev, res); |
456 | |
425 | |
457 | if (expect_true (ringbuf_valid)) |
426 | if (ecb_expect_true (ringbuf_valid)) |
458 | { |
427 | { |
459 | /* if we have a ring buffer, handle any remaining events in it */ |
428 | /* if we have a ring buffer, handle any remaining events in it */ |
460 | linuxaio_get_events_from_ring (EV_A); |
429 | linuxaio_get_events_from_ring (EV_A); |
461 | |
430 | |
462 | /* at this point, we should have handled all outstanding events */ |
431 | /* at this point, we should have handled all outstanding events */ |
… | |
… | |
467 | break; |
436 | break; |
468 | } |
437 | } |
469 | else |
438 | else |
470 | break; /* no events from the kernel, we are done */ |
439 | break; /* no events from the kernel, we are done */ |
471 | |
440 | |
472 | timeout = 0; /* only wait in the first iteration */ |
441 | timeout = EV_TS_CONST (0.); /* only wait in the first iteration */ |
473 | } |
442 | } |
474 | } |
443 | } |
475 | |
444 | |
476 | inline_size |
445 | inline_size |
477 | int |
446 | int |
… | |
… | |
493 | /* which allows us to pinpoint the erroneous iocb */ |
462 | /* which allows us to pinpoint the erroneous iocb */ |
494 | for (submitted = 0; submitted < linuxaio_submitcnt; ) |
463 | for (submitted = 0; submitted < linuxaio_submitcnt; ) |
495 | { |
464 | { |
496 | int res = evsys_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted); |
465 | int res = evsys_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted); |
497 | |
466 | |
498 | if (expect_false (res < 0)) |
467 | if (ecb_expect_false (res < 0)) |
499 | if (errno == EINVAL) |
468 | if (errno == EINVAL) |
500 | { |
469 | { |
501 | /* This happens for unsupported fds, officially, but in my testing, |
470 | /* This happens for unsupported fds, officially, but in my testing, |
502 | * also randomly happens for supported fds. We fall back to good old |
471 | * also randomly happens for supported fds. We fall back to good old |
503 | * poll() here, under the assumption that this is a very rare case. |
472 | * poll() here, under the assumption that this is a very rare case. |
… | |
… | |
533 | } |
502 | } |
534 | |
503 | |
535 | ++linuxaio_iteration; |
504 | ++linuxaio_iteration; |
536 | if (linuxaio_io_setup (EV_A) < 0) |
505 | if (linuxaio_io_setup (EV_A) < 0) |
537 | { |
506 | { |
|
|
507 | /* TODO: rearm all and recreate epoll backend from scratch */ |
|
|
508 | /* TODO: might be more prudent? */ |
|
|
509 | |
538 | /* to bad, we can't get a new aio context, go 100% epoll */ |
510 | /* to bad, we can't get a new aio context, go 100% epoll */ |
539 | linuxaio_free_iocbp (EV_A); |
511 | linuxaio_free_iocbp (EV_A); |
540 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
512 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
541 | ev_ref (EV_A); |
513 | ev_ref (EV_A); |
542 | linuxaio_ctx = 0; |
514 | linuxaio_ctx = 0; |
|
|
515 | |
|
|
516 | backend = EVBACKEND_EPOLL; |
543 | backend_modify = epoll_modify; |
517 | backend_modify = epoll_modify; |
544 | backend_poll = epoll_poll; |
518 | backend_poll = epoll_poll; |
545 | } |
519 | } |
546 | |
520 | |
547 | timeout = 0; |
521 | timeout = EV_TS_CONST (0.); |
548 | /* it's easiest to handle this mess in another iteration */ |
522 | /* it's easiest to handle this mess in another iteration */ |
549 | return; |
523 | return; |
550 | } |
524 | } |
551 | else if (errno == EBADF) |
525 | else if (errno == EBADF) |
552 | { |
526 | { |
553 | assert (("libev: event loop rejected bad fd", errno != EBADF)); |
527 | assert (("libev: event loop rejected bad fd", errno != EBADF)); |
554 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
528 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
555 | |
529 | |
556 | res = 1; /* skip this iocb */ |
530 | res = 1; /* skip this iocb */ |
557 | } |
531 | } |
|
|
532 | else if (errno == EINTR) /* not seen in reality, not documented */ |
|
|
533 | res = 0; /* silently ignore and retry */ |
558 | else |
534 | else |
|
|
535 | { |
559 | ev_syserr ("(libev) linuxaio io_submit"); |
536 | ev_syserr ("(libev) linuxaio io_submit"); |
|
|
537 | res = 0; |
|
|
538 | } |
560 | |
539 | |
561 | submitted += res; |
540 | submitted += res; |
562 | } |
541 | } |
563 | |
542 | |
564 | linuxaio_submitcnt = 0; |
543 | linuxaio_submitcnt = 0; |
… | |
… | |
587 | { |
566 | { |
588 | epoll_destroy (EV_A); |
567 | epoll_destroy (EV_A); |
589 | return 0; |
568 | return 0; |
590 | } |
569 | } |
591 | |
570 | |
592 | ev_io_init (EV_A_ &linuxaio_epoll_w, linuxaio_epoll_cb, backend_fd, EV_READ); |
571 | ev_io_init (&linuxaio_epoll_w, linuxaio_epoll_cb, backend_fd, EV_READ); |
593 | ev_set_priority (&linuxaio_epoll_w, EV_MAXPRI); |
572 | ev_set_priority (&linuxaio_epoll_w, EV_MAXPRI); |
594 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
573 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
595 | ev_unref (EV_A); /* watcher should not keep loop alive */ |
574 | ev_unref (EV_A); /* watcher should not keep loop alive */ |
596 | |
575 | |
597 | backend_modify = linuxaio_modify; |
576 | backend_modify = linuxaio_modify; |
598 | backend_poll = linuxaio_poll; |
577 | backend_poll = linuxaio_poll; |
599 | |
578 | |
600 | linuxaio_iocbpmax = 0; |
579 | linuxaio_iocbpmax = 0; |
601 | linuxaio_iocbps = 0; |
580 | linuxaio_iocbps = 0; |
602 | |
581 | |
603 | linuxaio_submits = 0; |
582 | linuxaio_submits = 0; |
… | |
… | |
614 | epoll_destroy (EV_A); |
593 | epoll_destroy (EV_A); |
615 | linuxaio_free_iocbp (EV_A); |
594 | linuxaio_free_iocbp (EV_A); |
616 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
595 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
617 | } |
596 | } |
618 | |
597 | |
619 | inline_size |
598 | ecb_cold |
620 | void |
599 | static void |
621 | linuxaio_fork (EV_P) |
600 | linuxaio_fork (EV_P) |
622 | { |
601 | { |
623 | /* this frees all iocbs, which is very heavy-handed */ |
|
|
624 | linuxaio_destroy (EV_A); |
|
|
625 | linuxaio_submitcnt = 0; /* all pointers were invalidated */ |
602 | linuxaio_submitcnt = 0; /* all pointers were invalidated */ |
|
|
603 | linuxaio_free_iocbp (EV_A); /* this frees all iocbs, which is very heavy-handed */ |
|
|
604 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
626 | |
605 | |
627 | linuxaio_iteration = 0; /* we start over in the child */ |
606 | linuxaio_iteration = 0; /* we start over in the child */ |
628 | |
607 | |
629 | while (linuxaio_io_setup (EV_A) < 0) |
608 | while (linuxaio_io_setup (EV_A) < 0) |
630 | ev_syserr ("(libev) linuxaio io_setup"); |
609 | ev_syserr ("(libev) linuxaio io_setup"); |
631 | |
610 | |
632 | /* forking epoll should also effectively unregister all fds from the backend */ |
611 | /* forking epoll should also effectively unregister all fds from the backend */ |
633 | epoll_fork (EV_A); |
612 | epoll_fork (EV_A); |
|
|
613 | /* epoll_fork already did this. hopefully */ |
|
|
614 | /*fd_rearm_all (EV_A);*/ |
634 | |
615 | |
635 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
616 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
636 | ev_io_set (EV_A_ &linuxaio_epoll_w, backend_fd, EV_READ); |
617 | ev_io_set (EV_A_ &linuxaio_epoll_w, backend_fd, EV_READ); |
637 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
618 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
638 | |
|
|
639 | /* epoll_fork already did this. hopefully */ |
|
|
640 | /*fd_rearm_all (EV_A);*/ |
|
|
641 | } |
619 | } |
642 | |
620 | |