From 1f76aceebf3a8ed9d4d54df443c09c578562752e Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 22 Oct 2009 17:54:36 +0200 Subject: Add qemu_aio_process_queue() We'll leave some AIO completions unhandled when we can't call the callback. qemu_aio_process_queue() is used later to run any callbacks that are left and can be run then. Signed-off-by: Kevin Wolf Signed-off-by: Anthony Liguori --- aio.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'aio.c') diff --git a/aio.c b/aio.c index da18443369..f164a478c5 100644 --- a/aio.c +++ b/aio.c @@ -33,6 +33,7 @@ struct AioHandler IOHandler *io_read; IOHandler *io_write; AioFlushHandler *io_flush; + AioProcessQueue *io_process_queue; int deleted; void *opaque; QLIST_ENTRY(AioHandler) node; @@ -55,6 +56,7 @@ int qemu_aio_set_fd_handler(int fd, IOHandler *io_read, IOHandler *io_write, AioFlushHandler *io_flush, + AioProcessQueue *io_process_queue, void *opaque) { AioHandler *node; @@ -87,6 +89,7 @@ int qemu_aio_set_fd_handler(int fd, node->io_read = io_read; node->io_write = io_write; node->io_flush = io_flush; + node->io_process_queue = io_process_queue; node->opaque = opaque; } @@ -115,6 +118,26 @@ void qemu_aio_flush(void) } while (qemu_bh_poll() || ret > 0); } +int qemu_aio_process_queue(void) +{ + AioHandler *node; + int ret = 0; + + walking_handlers = 1; + + QLIST_FOREACH(node, &aio_handlers, node) { + if (node->io_process_queue) { + if (node->io_process_queue(node->opaque)) { + ret = 1; + } + } + } + + walking_handlers = 0; + + return ret; +} + void qemu_aio_wait(void) { int ret; @@ -122,6 +145,13 @@ void qemu_aio_wait(void) if (qemu_bh_poll()) return; + /* + * If there are callbacks left that have been queued, we need to call then. + * Return afterwards to avoid waiting needlessly in select(). + */ + if (qemu_aio_process_queue()) + return; + do { AioHandler *node; fd_set rdfds, wrfds; -- cgit v1.2.3