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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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507 | /* it's easiest to handle this mess in another iteration */ |
511 | /* it's easiest to handle this mess in another iteration */ |
508 | return; |
512 | return; |
509 | } |
513 | } |
510 | else if (errno == EBADF) |
514 | else if (errno == EBADF) |
511 | { |
515 | { |
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516 | assert (("libev: event loop rejected bad fd", errno != EBADF)); |
512 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
517 | fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes); |
513 | |
518 | |
514 | res = 1; /* skip this iocb */ |
519 | res = 1; /* skip this iocb */ |
515 | } |
520 | } |
516 | else |
521 | else |
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569 | void |
574 | void |
570 | linuxaio_destroy (EV_P) |
575 | linuxaio_destroy (EV_P) |
571 | { |
576 | { |
572 | epoll_destroy (EV_A); |
577 | epoll_destroy (EV_A); |
573 | linuxaio_free_iocbp (EV_A); |
578 | linuxaio_free_iocbp (EV_A); |
574 | evsys_io_destroy (linuxaio_ctx); |
579 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
575 | } |
580 | } |
576 | |
581 | |
577 | inline_size |
582 | inline_size |
578 | void |
583 | void |
579 | linuxaio_fork (EV_P) |
584 | linuxaio_fork (EV_P) |
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585 | linuxaio_iteration = 0; /* we start over in the child */ |
590 | linuxaio_iteration = 0; /* we start over in the child */ |
586 | |
591 | |
587 | while (linuxaio_io_setup (EV_A) < 0) |
592 | while (linuxaio_io_setup (EV_A) < 0) |
588 | ev_syserr ("(libev) linuxaio io_setup"); |
593 | ev_syserr ("(libev) linuxaio io_setup"); |
589 | |
594 | |
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595 | /* forking epoll should also effectively unregister all fds from the backend */ |
590 | epoll_fork (EV_A); |
596 | epoll_fork (EV_A); |
591 | |
597 | |
592 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
598 | ev_io_stop (EV_A_ &linuxaio_epoll_w); |
593 | 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); |
594 | ev_io_start (EV_A_ &linuxaio_epoll_w); |
600 | ev_io_start (EV_A_ &linuxaio_epoll_w); |