main-loop.h: introduce qemu_in_main_thread()
authorEmanuele Giuseppe Esposito <eesposit@redhat.com>
Thu, 3 Mar 2022 15:15:46 +0000 (10:15 -0500)
committerKevin Wolf <kwolf@redhat.com>
Fri, 4 Mar 2022 17:18:15 +0000 (18:18 +0100)
commit6538692e2802666926e62d9309ddddda5ec9dc3b
tree2e846ea0c7ecaf993195b3fd55a7bf43b75afb5e
parentad6fe44bea25e9b0efe050d00751466ad2779631
main-loop.h: introduce qemu_in_main_thread()

When invoked from the main loop, this function is the same
as qemu_mutex_iothread_locked, and returns true if the BQL is held.
When invoked from iothreads or tests, it returns true only
if the current AioContext is the Main Loop.

This essentially just extends qemu_mutex_iothread_locked to work
also in unit tests or other users like storage-daemon, that run
in the Main Loop but end up using the implementation in
stubs/iothread-lock.c.

Using qemu_mutex_iothread_locked in unit tests defaults to false
because they use the implementation in stubs/iothread-lock,
making all assertions added in next patches fail despite the
AioContext is still the main loop.

See the comment in the function header for more information.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220303151616.325444-2-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
include/qemu/main-loop.h
softmmu/cpus.c
stubs/iothread-lock-block.c [new file with mode: 0644]
stubs/meson.build
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