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monitor: do not use mb_read/mb_set for suspend_cnt

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Clean up monitor_event to just use monitor_suspend/monitor_resume,
using mon->mux_out to protect against incorrect nesting (especially
on startup).

The only remaining case of reading suspend_cnt is in the can_read
callback, which is just advisory and can use qatomic_read.

As an extra benefit, mux_out is now simply protected by mon_lock.
Also, moving the prompt to the beginning of the main loop removes
it from the output in some error cases where QEMU does not actually
start successfully.  It is not a full fix and it would be nice to
also remove the monitor heading, but this is already a small (though
unintentional) improvement.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-03 13:32:13 +01:00
parent 4cb96b9742
commit 6ee7c82d0d
5 changed files with 39 additions and 38 deletions
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3
monitor/monitor-internal.h
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@ -94,7 +94,6 @@ typedef struct HMPCommand {
struct Monitor {
CharBackend chr;
int reset_seen;
int suspend_cnt; /* Needs to be accessed atomically */
bool is_qmp;
bool skip_flush;
@ -115,8 +114,8 @@ struct Monitor {
QLIST_HEAD(, mon_fd_t) fds;
GString *outbuf;
guint out_watch;
/* Read under either BQL or mon_lock, written with BQL+mon_lock. */
int mux_out;
int reset_seen;
};
struct MonitorHMP {