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thread-posix: implement Semaphore with QemuCond and QemuMutex
Now that QemuSemaphore is implemented through pthread_cond_t only, we can use QemuCond and QemuMutex to make the code smaller. Features such as mutex tracing and CLOCK_MONOTONIC timedwait are supported in qemu-sem naturally. Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com> Message-Id: <20220222090507.2028-4-longpeng2@huawei.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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