On 16.10.19 19:09, Vladimir Sementsov-Ogievskiy wrote: > Introduce an API for some shared splittable resource, like memory. > It's going to be used by backup. Backup uses both read/write io and > copy_range. copy_range may consume memory implictly, so the new API is > abstract: it doesn't allocate any real memory by but only hands out
-by > tickets. > > The idea is that we have some total amount of something and callers > should wait in coroutine queue if there is not enough of the resource > at the moment. > > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > --- > include/qemu/co-shared-resource.h | 71 +++++++++++++++++++++++++++++ > util/qemu-co-shared-resource.c | 76 +++++++++++++++++++++++++++++++ > util/Makefile.objs | 1 + > 3 files changed, 148 insertions(+) > create mode 100644 include/qemu/co-shared-resource.h > create mode 100644 util/qemu-co-shared-resource.c > > diff --git a/include/qemu/co-shared-resource.h > b/include/qemu/co-shared-resource.h > new file mode 100644 > index 0000000000..04c9c3d5be > --- /dev/null > +++ b/include/qemu/co-shared-resource.h > @@ -0,0 +1,71 @@ > +/* > + * Helper functionality for distributing a fixed total amount of > + * an abstract resource among multiple coroutines. > + * > + * Copyright (c) 2019 Virtuozzo International GmbH > + * > + * Permission is hereby granted, free of charge, to any person obtaining a > copy > + * of this software and associated documentation files (the "Software"), to > deal > + * in the Software without restriction, including without limitation the > rights > + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell > + * copies of the Software, and to permit persons to whom the Software is > + * furnished to do so, subject to the following conditions: > + * > + * The above copyright notice and this permission notice shall be included in > + * all copies or substantial portions of the Software. > + * > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING > FROM, > + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN > + * THE SOFTWARE. > + */ > + > +#ifndef QEMU_CO_SHARED_AMOUNT_H > +#define QEMU_CO_SHARED_AMOUNT_H You should probably adjust these include guards to match the new filename. With those bits fixed: Reviewed-by: Max Reitz <mre...@redhat.com>
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