Add wall_clock option to the log subsystem to get absolute time stamps

common/utils/LOG/DOC/rtusage.md

@@ -9,7 +9,7 @@ All logging facility parameters are defined in the log_config section. Some para
 |:---:|:---:|:---:|:----|
 | `global_log_level` | `pre-defined string of char` | `info` |  Allows printing of messages up to the specified  level. Available levels, from lower to higher are `error`,`warn`,`analysis`,`info`,`debug`,`trace` |
 | `global_log_online` | `boolean` | 1 (=true) | If false, all console messages are discarded, whatever their level |
-| `global_log_options` | `list of pre-defined string of char` |  |  5 options can be specified to trigger the information added in the header of the message:  `nocolor`, disable color usage in log messages, usefull when redirecting logs to a file, where escape sequences used for color selection can be annoying, `level`, add a one letter level id in the message header (T,D,I,A,W,E for trace, debug, info, analysis, warning, error),`thread`, add the thread name in the message header, `thread_id`, adds the thread ID in the message header, `function`, adds the function name, `line_num`, adds the line number, `time` adds the time since process starts|
+| `global_log_options` | `list of pre-defined string of char` |  |  5 options can be specified to trigger the information added in the header of the message:  `nocolor`, disable color usage in log messages, usefull when redirecting logs to a file, where escape sequences used for color selection can be annoying, `level`, add a one letter level id in the message header (T,D,I,A,W,E for trace, debug, info, analysis, warning, error),`thread`, add the thread name in the message header, `thread_id`, adds the thread ID in the message header, `function`, adds the function name, `line_num`, adds the line number, `time` adds the time since process starts, `wall_clock` adds the system-wide clock time that measures real (i.e., wall-clock) time |
 
 ### Component specific parameters
 | name | type | default | description |

common/utils/LOG/log.c

@@ -84,10 +84,10 @@ mapping log_options[] = {
   {"function", FLAG_FUNCT},
   {"time",     FLAG_TIME},
   {"thread_id", FLAG_THREAD_ID},
+  {"wall_clock", FLAG_REAL_TIME},
   {NULL,-1}
 };
 
-
 mapping log_maskmap[] = LOG_MASKMAP_INIT;
 
 char *log_level_highlight_start[] = {LOG_RED, LOG_ORANGE, LOG_GREEN, "", LOG_BLUE, LOG_CYBL};  /*!< \brief Optional start-format strings for highlighting */
@@ -512,6 +512,9 @@ int logInit (void)
     memset(&(g_log->log_component[i]),0,sizeof(log_component_t));
   }
 
+  AssertFatal(!((g_log->flag & FLAG_TIME) && (g_log->flag & FLAG_REAL_TIME)),
+		   "Invalid log options: time and wall_clock both set but are mutually exclusive\n");
+
   g_log->flag =  g_log->flag | FLAG_INITIALIZED;
   printf("log init done\n");
   return 0;
@@ -554,10 +557,12 @@ static inline int log_header(log_component_t *c,
   else
     l[0] = 0;
 
+  // output time information
   char timeString[32];
-  if ( flag & FLAG_TIME ) {
+  if ((flag & FLAG_TIME) || (flag & FLAG_REAL_TIME)) {
     struct timespec t;
-    if (clock_gettime(CLOCK_MONOTONIC, &t) == -1)
+    const clockid_t clock = flag & FLAG_TIME ? CLOCK_MONOTONIC : CLOCK_REALTIME;
+    if (clock_gettime(clock, &t) == -1)
         abort();
     snprintf(timeString, sizeof(timeString), "%lu.%06lu ",
              t.tv_sec,

common/utils/LOG/log.h

@@ -129,6 +129,7 @@ extern "C" {
 #define FLAG_FILE_LINE   0x0040
 #define FLAG_TIME        0x0100
 #define FLAG_THREAD_ID   0x0200
+#define FLAG_REAL_TIME   0x0400
 #define FLAG_INITIALIZED 0x8000
 
 #define SET_LOG_OPTION(O)   g_log->flag = (g_log->flag | O)