Re: [PATCH 1/6] system/cpus: rename qemu_mutex_lock_iothread() to qemu_bql_lock()

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On 11/29/23 22:26, Stefan Hajnoczi wrote:
The Big QEMU Lock (BQL) has many names and they are confusing. The
actual QemuMutex variable is called qemu_global_mutex but it's commonly
referred to as the BQL in discussions and some code comments. The
locking APIs, however, are called qemu_mutex_lock_iothread() and
qemu_mutex_unlock_iothread().

The "iothread" name is historic and comes from when the main thread was
split into into KVM vcpu threads and the "iothread" (now called the main
loop thread). I have contributed to the confusion myself by introducing
a separate --object iothread, a separate concept unrelated to the BQL.

The "iothread" name is no longer appropriate for the BQL. Rename the
locking APIs to:
- void qemu_bql_lock(void)
- void qemu_bql_unlock(void)
- bool qemu_bql_locked(void)

There are more APIs with "iothread" in their names. Subsequent patches
will rename them. There are also comments and documentation that will be
updated in later patches.

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>


Reviewed-by: Cédric Le Goater <clg@xxxxxxxx>

Thanks,

C.







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