RFC: patch to trigger thread stats output from cyclictest with SIGHUP

[Clark Williams <williams@redhat.com>]

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John,

Steven suggested a feature for cyclictest that I'd actually been
whining about (internally anyway). During long rteval runs there's
really no feedback available if you want to know how the run is
progressing. Steven suggested sending SIGHUP and dumping the current
state. Below is a patch that seems to work for cyclictest; just
wanted to get some feedback on whether this would be acceptable
behaviour. 

Of course if we get this going then we need to figure out how to wire
it into rteval as well :).

Clark


diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 0a15dcb..51b97cf 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -199,6 +199,11 @@ static char **traceptr;
 static int traceopt_count;
 static int traceopt_size;
 
+static struct thread_param **parameters;
+static struct thread_stat **statistics;
+
+static void print_stat(struct thread_param *par, int index, int verbose);
+
 static int latency_target_fd = -1;
 static int32_t latency_target_value = 0;
 
@@ -1368,6 +1373,19 @@ static int check_timer(void)
 
 static void sighand(int sig)
 {
+	if (sig == SIGHUP) {
+		int i;
+		int oldquiet = quiet;
+
+		quiet = 0;
+		printf("#---------------------------\n");
+		printf("# cyclictest current status:\n");
+		for (i = 0; i < num_threads; i++)
+			print_stat(parameters[i], i, 0);
+		printf("#---------------------------\n");
+		quiet = oldquiet;
+		return;
+	}
 	shutdown = 1;
 	if (refresh_on_max)
 		pthread_cond_signal(&refresh_on_max_cond);
@@ -1503,8 +1521,6 @@ int main(int argc, char **argv)
 	sigset_t sigset;
 	int signum = SIGALRM;
 	int mode;
-	struct thread_param **parameters;
-	struct thread_stat **statistics;
 	int max_cpus = sysconf(_SC_NPROCESSORS_CONF);
 	int i, ret = -1;
 	int status;
@@ -1642,6 +1658,7 @@ int main(int argc, char **argv)
 
 	signal(SIGINT, sighand);
 	signal(SIGTERM, sighand);
+	signal(SIGHUP, sighand);
 
 	parameters = calloc(num_threads, sizeof(struct thread_param *));
 	if (!parameters)

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