From ac2662a913ee5854b1269256adbdc14e57ba480a Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Mon, 7 Jul 2014 15:15:52 +0200 Subject: coroutine: make pool size dynamic Allow coroutine users to adjust the pool size. For example, if the guest has multiple emulated disk drives we should keep around more coroutines. Signed-off-by: Stefan Hajnoczi Reviewed-by: Eric Blake --- include/block/coroutine.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/block/coroutine.h b/include/block/coroutine.h index b408f96b82..b9b7f488c9 100644 --- a/include/block/coroutine.h +++ b/include/block/coroutine.h @@ -223,4 +223,15 @@ void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type, * Note that this function clobbers the handlers for the file descriptor. */ void coroutine_fn yield_until_fd_readable(int fd); + +/** + * Add or subtract from the coroutine pool size + * + * The coroutine implementation keeps a pool of coroutines to be reused by + * qemu_coroutine_create(). This makes coroutine creation cheap. Heavy + * coroutine users should call this to reserve pool space. Call it again with + * a negative number to release pool space. + */ +void qemu_coroutine_adjust_pool_size(int n); + #endif /* QEMU_COROUTINE_H */ -- cgit v1.2.1