qemu/monitor
Kevin Wolf e69ee454b5 monitor: Make current monitor a per-coroutine property
This way, a monitor command handler will still be able to access the
current monitor, but when it yields, all other code code will correctly
get NULL from monitor_cur().

This uses a hash table to map the coroutine pointer to the current
monitor of that coroutine.  Outside of coroutine context, we associate
the current monitor with the leader coroutine of the current thread.

Approaches to implement some form of coroutine local storage directly in
the coroutine core code have been considered and discarded because they
didn't end up being much more generic than the hash table and their
performance impact on coroutines not using coroutine local storage was
unclear. As the block layer uses a coroutine per I/O request, this is a
fast path and we have to be careful. It's safest to just stay out of
this path with code only used by the monitor.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201005155855.256490-8-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-10-09 07:08:19 +02:00
..
hmp-cmds.c monitor: Add Monitor parameter to monitor_get_cpu_index() 2020-10-09 07:08:19 +02:00
hmp.c monitor: Make current monitor a per-coroutine property 2020-10-09 07:08:19 +02:00
meson.build configure: do not include dependency flags in QEMU_CFLAGS and LIBS 2020-09-08 11:43:16 +02:00
misc.c hmp: Update current monitor only in handle_hmp_command() 2020-10-09 07:08:19 +02:00
monitor-internal.h qom: Clean up inconsistent use of gchar * vs. char * 2020-05-15 06:26:02 +02:00
monitor.c monitor: Make current monitor a per-coroutine property 2020-10-09 07:08:19 +02:00
qmp-cmds-control.c monitor: Use getter/setter functions for cur_mon 2020-10-09 07:08:19 +02:00
qmp-cmds.c monitor: Use getter/setter functions for cur_mon 2020-10-09 07:08:19 +02:00
qmp.c qmp: Call monitor_set_cur() only in qmp_dispatch() 2020-10-09 07:08:19 +02:00
trace-events monitor: Split out monitor/monitor.c 2019-06-18 08:14:17 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00