monitor: add more *_locked() functions

Allow flushing and printing to the monitor while mon->mon_lock is
held.  This will help cleaning up the locking of mon->mux_out and
mon->suspend_cnt.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/monitor/monitor.h

@@ -40,6 +40,9 @@ void monitor_flush(Monitor *mon);
 int monitor_set_cpu(Monitor *mon, int cpu_index);
 int monitor_get_cpu_index(Monitor *mon);
 
+int monitor_puts_locked(Monitor *mon, const char *str);
+void monitor_flush_locked(Monitor *mon);
+
 void *gpa2hva(MemoryRegion **p_mr, hwaddr addr, uint64_t size, Error **errp);
 
 void monitor_read_command(MonitorHMP *mon, int show_prompt);

monitor/monitor.c

@@ -154,8 +154,6 @@ static inline bool monitor_is_hmp_non_interactive(const Monitor *mon)
     return !monitor_uses_readline(container_of(mon, MonitorHMP, common));
 }
 
-static void monitor_flush_locked(Monitor *mon);
-
 static gboolean monitor_unblocked(void *do_not_use, GIOCondition cond,
                                   void *opaque)
 {
@@ -168,7 +166,7 @@ static gboolean monitor_unblocked(void *do_not_use, GIOCondition cond,
 }
 
 /* Caller must hold mon->mon_lock */
-static void monitor_flush_locked(Monitor *mon)
+void monitor_flush_locked(Monitor *mon)
 {
     int rc;
     size_t len;
@@ -207,12 +205,11 @@ void monitor_flush(Monitor *mon)
 }
 
 /* flush at every end of line */
-int monitor_puts(Monitor *mon, const char *str)
+int monitor_puts_locked(Monitor *mon, const char *str)
 {
     int i;
     char c;
 
-    qemu_mutex_lock(&mon->mon_lock);
     for (i = 0; str[i]; i++) {
         c = str[i];
         if (c == '\n') {
@@ -223,11 +220,16 @@ int monitor_puts(Monitor *mon, const char *str)
             monitor_flush_locked(mon);
         }
     }
-    qemu_mutex_unlock(&mon->mon_lock);
 
     return i;
 }
 
+int monitor_puts(Monitor *mon, const char *str)
+{
+    QEMU_LOCK_GUARD(&mon->mon_lock);
+    return monitor_puts_locked(mon, str);
+}
+
 int monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
 {
     char *buf;