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124 | * our syscalls return < 0, not == -1, on error. which is good |
124 | * our syscalls return < 0, not == -1, on error. which is good |
125 | * enough for linux aio. |
125 | * enough for linux aio. |
126 | * TODO: arm is also common nowadays, maybe even mips and x86 |
126 | * TODO: arm is also common nowadays, maybe even mips and x86 |
127 | * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove... |
127 | * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove... |
128 | */ |
128 | */ |
129 | #if __GNUC__ && __linux && ECB_AMD64 |
129 | #if __GNUC__ && __linux && ECB_AMD64 && !defined __OPTIMIZE_SIZE__ |
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130 | /* the costly errno access probably kills this for size optimisation */ |
130 | |
131 | |
131 | #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5) \ |
132 | #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5) \ |
132 | ({ \ |
133 | ({ \ |
133 | long res; \ |
134 | long res; \ |
134 | register unsigned long r5 __asm__ ("r8" ); \ |
135 | register unsigned long r5 __asm__ ("r8" ); \ |
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288 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
289 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
289 | |
290 | |
290 | if (iocb->io.aio_reqprio < 0) |
291 | if (iocb->io.aio_reqprio < 0) |
291 | { |
292 | { |
292 | /* we handed this fd over to epoll, so undo this first */ |
293 | /* we handed this fd over to epoll, so undo this first */ |
293 | /* we do it manually because the optimisations on epoll_modfy won't do us any good */ |
294 | /* we do it manually because the optimisations on epoll_modify won't do us any good */ |
294 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
295 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
295 | anfds [fd].emask = 0; |
296 | anfds [fd].emask = 0; |
296 | iocb->io.aio_reqprio = 0; |
297 | iocb->io.aio_reqprio = 0; |
297 | } |
298 | } |
298 | |
299 | |
299 | if (iocb->io.aio_buf) |
300 | if (iocb->io.aio_buf) |
300 | /* io_cancel always returns some error on relevant kernels, but works */ |
301 | { |
301 | evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0); |
302 | evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0); |
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303 | /* on relevant kernels, io_cancel fails with EINPROGRES if everything is fine */ |
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304 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINPROGRESS)); |
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305 | } |
302 | |
306 | |
303 | if (nev) |
307 | if (nev) |
304 | { |
308 | { |
305 | iocb->io.aio_buf = |
309 | iocb->io.aio_buf = |
306 | (nev & EV_READ ? POLLIN : 0) |
310 | (nev & EV_READ ? POLLIN : 0) |
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424 | /* ignored */; |
428 | /* ignored */; |
425 | else |
429 | else |
426 | ev_syserr ("(libev) linuxaio io_getevents"); |
430 | ev_syserr ("(libev) linuxaio io_getevents"); |
427 | else if (res) |
431 | else if (res) |
428 | { |
432 | { |
429 | /* at least one event received, handle it and any remaining ones in the ring buffer */ |
433 | /* at least one event available, handle it and any remaining ones in the ring buffer */ |
430 | linuxaio_parse_events (EV_A_ ioev, res); |
434 | linuxaio_parse_events (EV_A_ ioev, res); |
431 | linuxaio_get_events_from_ring (EV_A); |
435 | linuxaio_get_events_from_ring (EV_A); |
432 | } |
436 | } |
433 | } |
437 | } |
434 | |
438 | |
435 | static int |
439 | inline_size |
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440 | int |
436 | linuxaio_io_setup (EV_P) |
441 | linuxaio_io_setup (EV_P) |
437 | { |
442 | { |
438 | linuxaio_ctx = 0; |
443 | linuxaio_ctx = 0; |
439 | return evsys_io_setup (linuxaio_nr_events (EV_A), &linuxaio_ctx); |
444 | return evsys_io_setup (linuxaio_nr_events (EV_A), &linuxaio_ctx); |
440 | } |
445 | } |
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506 | /* it's easiest to handle this mess in another iteration */ |
511 | /* it's easiest to handle this mess in another iteration */ |
507 | return; |
512 | return; |
508 | } |
513 | } |
509 | else if (errno == EBADF) |
514 | else if (errno == EBADF) |
510 | { |
515 | { |
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516 | assert (("libev: event loop rejected bad fd", errno != EBADF)); |
511 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
517 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
512 | |
518 | |
513 | res = 1; /* skip this iocb */ |
519 | res = 1; /* skip this iocb */ |
514 | } |
520 | } |
515 | else |
521 | else |
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568 | void |
574 | void |
569 | linuxaio_destroy (EV_P) |
575 | linuxaio_destroy (EV_P) |
570 | { |
576 | { |
571 | epoll_destroy (EV_A); |
577 | epoll_destroy (EV_A); |
572 | linuxaio_free_iocbp (EV_A); |
578 | linuxaio_free_iocbp (EV_A); |
573 | evsys_io_destroy (linuxaio_ctx); |
579 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
574 | } |
580 | } |
575 | |
581 | |
576 | inline_size |
582 | inline_size |
577 | void |
583 | void |
578 | linuxaio_fork (EV_P) |
584 | linuxaio_fork (EV_P) |
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584 | linuxaio_iteration = 0; /* we start over in the child */ |
590 | linuxaio_iteration = 0; /* we start over in the child */ |
585 | |
591 | |
586 | while (linuxaio_io_setup (EV_A) < 0) |
592 | while (linuxaio_io_setup (EV_A) < 0) |
587 | ev_syserr ("(libev) linuxaio io_setup"); |
593 | ev_syserr ("(libev) linuxaio io_setup"); |
588 | |
594 | |
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595 | /* forking epoll should also effectively unregister all fds from the backend */ |
589 | epoll_fork (EV_A); |
596 | epoll_fork (EV_A); |
590 | |
597 | |
591 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
598 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
592 | ev_io_set (EV_A_ &linuxaio_epoll_w, backend_fd, EV_READ); |
599 | ev_io_set (EV_A_ &linuxaio_epoll_w, backend_fd, EV_READ); |
593 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
600 | ev_io_start (EV_A_ &linuxaio_epoll_w); |