From 5e9b4c670dccf534490a0b2f6ebcb5fcb730c680 Mon Sep 17 00:00:00 2001
From: Laurent MAZET <laurent.mazet@thalesgroup.com>
Date: Fri, 3 Oct 2025 18:03:17 +0200
Subject: [PATCH] add a test on thread create only

---
 thread.c => thread_c+j.c | 11 ++++----
 thread_c.c               | 55 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 5 deletions(-)
 rename thread.c => thread_c+j.c (82%)
 create mode 100644 thread_c.c

diff --git a/thread.c b/thread_c+j.c
similarity index 82%
rename from thread.c
rename to thread_c+j.c
index 92cec97..6e10272 100644
--- a/thread.c
+++ b/thread_c+j.c
@@ -13,13 +13,14 @@
 dts_t *deltas = NULL;
 int nb_measurements = 0;
 
-char *message = "thread";
+char *message = "Thread (create and join) latency";
 void (*usage_ext) (FILE *) = NULL;
 int (*parse_arg_ext) (char *) = NULL;
 
-void* dummy_thread(void *arg) {
-    (void)arg;
-    return NULL;
+
+void* dummy_thread (__attribute__((unused)) void *arg)
+{
+    pthread_exit (NULL);
 }
 
 int test (dts_t *buffer, int nb)
@@ -48,7 +49,7 @@ int test (dts_t *buffer, int nb)
         ts_t ts2;
         sys_timestamp (&ts2);
 
-        deltas[i++] = diff_timestamp (&ts2, &ts1);
+        deltas[i] = diff_timestamp (&ts2, &ts1);
     }
 
     return 0;
diff --git a/thread_c.c b/thread_c.c
new file mode 100644
index 0000000..d237157
--- /dev/null
+++ b/thread_c.c
@@ -0,0 +1,55 @@
+/* depend: */
+/* cflags: */
+/* linker: mtime.o test.o stat.o -lm -lpthread -lrt */
+
+#include <pthread.h>
+#include <stdio.h>
+
+#include "mtime.h"
+#include "test.h"
+
+/* global variables */
+
+dts_t *deltas = NULL;
+int nb_measurements = 0;
+
+char *message = "Thread (create) latency";
+void (*usage_ext) (FILE *) = NULL;
+int (*parse_arg_ext) (char *) = NULL;
+
+ts_t ts1, ts2;
+int try = 0;
+
+void* dummy_thread (__attribute__((unused)) void *arg)
+{
+    sys_timestamp (&ts2);
+    pthread_exit (NULL);
+}
+
+int test (dts_t *buffer, int nb)
+{
+
+    /* set global variables */
+
+    deltas = buffer;
+    nb_measurements = nb;
+
+    /* thread test */
+
+    for (int i = 0; i < nb_measurements; i++) {
+
+        sys_timestamp (&ts1);
+
+        pthread_t posix_t;
+        if (pthread_create(&posix_t, NULL, dummy_thread, NULL) != 0) {
+            fprintf (stderr, "error on pthread_create\n");
+            return 1;
+        }
+
+        pthread_join(posix_t, NULL);
+
+        deltas[i] = diff_timestamp (&ts2, &ts1);
+    }
+
+    return 0;
+}
-- 
2.30.2