1 files changed, 23 insertions, 0 deletions
diff --git a/util/log.c b/util/log.c
index bab4d29ecb..1a3121610a 100644
--- a/util/log.c
+++ b/util/log.c
@@ -34,6 +34,29 @@ int qemu_loglevel;
 static int log_append = 0;
 static GArray *debug_regions;
 
+/* Lock/unlock output. */
+
+FILE *qemu_log_lock(void)
+{
+    QemuLogFile *logfile;
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile) {
+        qemu_flockfile(logfile->fd);
+        return logfile->fd;
+    } else {
+        return NULL;
+    }
+}
+
+void qemu_log_unlock(FILE *fd)
+{
+    if (fd) {
+        qemu_funlockfile(fd);
+    }
+    rcu_read_unlock();
+}
+
 /* Return the number of characters emitted.  */
 int qemu_log(const char *fmt, ...)
 {