46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
/*
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Copyright (C) 2024 John Cox john.cox@raspberrypi.com
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef AVCODEC_WEAK_LINK_H
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#define AVCODEC_WEAK_LINK_H
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struct ff_weak_link_master;
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struct ff_weak_link_client;
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struct ff_weak_link_master * ff_weak_link_new(void * p);
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void ff_weak_link_break(struct ff_weak_link_master ** ppLink);
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struct ff_weak_link_client* ff_weak_link_ref(struct ff_weak_link_master * w);
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void ff_weak_link_unref(struct ff_weak_link_client ** ppLink);
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// Returns NULL if link broken - in this case it will also zap
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// *ppLink and unref the weak_link.
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// Returns NULL if *ppLink is NULL (so a link once broken stays broken)
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//
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// The above does mean that there is a race if this is called simultainiously
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// by two threads using the same weak_link_client (so don't do that)
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void * ff_weak_link_lock(struct ff_weak_link_client ** ppLink);
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void ff_weak_link_unlock(struct ff_weak_link_client * c);
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#endif
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