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authorStefan Hajnoczi <stefanha@redhat.com>2014-03-03 11:30:03 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2014-03-13 14:42:21 +0100
commit2da61b671eb89fcaa306738f44eed472977d6587 (patch)
tree61673e48ab889a6ea113ff4d2be2d48d7108d1a1 /async.c
parent11f590b1a242492a0108da42f40f0e2b20f0a778 (diff)
rfifolock: add recursive FIFO lock
QemuMutex does not guarantee fairness and cannot be acquired recursively: Fairness means each locker gets a turn and the scheduler cannot cause starvation. Recursive locking is useful for composition, it allows a sequence of locking operations to be invoked atomically by acquiring the lock around them. This patch adds RFifoLock, a recursive lock that guarantees FIFO order. Its first user is added in the next patch. RFifoLock has one additional feature: it can be initialized with an optional contention callback. The callback is invoked whenever a thread must wait for the lock. For example, it can be used to poke the current owner so that they release the lock soon. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'async.c')
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