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qemu-thread: optimize QemuLockCnt with futexes on Linux

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This is complex, but I think it is reasonably documented in the source.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170112180800.21085-5-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-01-12 19:07:54 +01:00 • committed by Stefan Hajnoczi
parent d7c99a1282
commit fbcc3e5004
7 changed files with 342 additions and 35 deletions
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2
util/qemu-thread-win32.c
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@ -269,7 +269,7 @@ void qemu_sem_wait(QemuSemaphore *sem)
*
* Valid transitions:
* - free->set, when setting the event
* - busy->set, when setting the event, followed by futex_wake
* - busy->set, when setting the event, followed by SetEvent
* - set->free, when resetting the event
* - free->busy, when waiting
*