An unsuccessful attempt to fix output corruption in
flood's <report>relative_times</report>.

Index: flood_report_relative_times.c
===================================================================
--- flood_report_relative_times.c	(revision 449338)
+++ flood_report_relative_times.c	(working copy)
@@ -27,10 +27,20 @@
 extern apr_file_t *local_stdout;
 extern apr_file_t *local_stderr;
 
+struct relative_times {
+    apr_thread_mutex_t *mutex;
+};
+
 apr_status_t relative_times_report_init(report_t **report, config_t *config, 
                               const char *profile_name, apr_pool_t *pool)
 {
-    return APR_SUCCESS;
+    struct relative_times *me;
+    me = apr_palloc(pool, sizeof(struct relative_times));
+    if (me == NULL) {
+        return APR_ENOMEM;
+    }
+    *report = me;
+    return apr_thread_mutex_create(&me->mutex, APR_THREAD_MUTEX_DEFAULT, pool);
 }
 
 apr_status_t relative_times_process_stats(report_t *report, int verified, request_t *req, response_t *resp, flood_timer_t *timer)
@@ -38,6 +48,7 @@
 #define FLOOD_PRINT_BUF 256
     apr_size_t buflen;
     char buf[FLOOD_PRINT_BUF];
+    struct relative_times *me = report;
 
     buflen = apr_snprintf(buf, FLOOD_PRINT_BUF,
                           "%" APR_INT64_T_FMT " %" APR_INT64_T_FMT
@@ -60,10 +71,15 @@
         apr_snprintf(buf+buflen, FLOOD_PRINT_BUF-buflen, " %d ", verified);
     }
 
-    /* FIXME: this call may need to be in a critical section */
 #if APR_HAS_THREADS
+    apr_thread_mutex_lock(me->mutex);
+    apr_file_lock(local_stdout, APR_FLOCK_EXCLUSIVE);
     apr_file_printf(local_stdout, "%s %ld %s\n", buf, apr_os_thread_current(), req->uri);
+    apr_file_flush(local_stdout);
+    apr_file_unlock(local_stdout);
+    apr_thread_mutex_unlock(me->mutex);
 #else
+#error no threads?
     apr_file_printf(local_stdout, "%s %d %s\n", buf, getpid(), req->uri);
 #endif
 
@@ -77,5 +93,7 @@
 
 apr_status_t relative_times_destroy_report(report_t *report)
 {
+    struct relative_times *me = report;
+    apr_thread_mutex_destroy(me->mutex);
     return APR_SUCCESS;
 }