tests: use g_usleep instead of rem = sleep(time)

Relying on sleep to always return having slept isn't safe as a signal
may have occurred. If signals are constantly incoming the program will
never reach its termination condition. This is believed to be the
mechanism causing time outs for qht-test in Travis.

The glib g_usleep() deals with all of this for us so lets use it instead.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

tests/atomic64-bench.c

@@ -74,16 +74,14 @@ static void *thread_func(void *arg)
 
 static void run_test(void)
 {
-    unsigned int remaining;
     unsigned int i;
 
     while (atomic_read(&n_ready_threads) != n_threads) {
         cpu_relax();
     }
+
     atomic_set(&test_start, true);
-    do {
-        remaining = sleep(duration);
-    } while (remaining);
+    g_usleep(duration * G_USEC_PER_SEC);
     atomic_set(&test_stop, true);
 
     for (i = 0; i < n_threads; i++) {

tests/atomic_add-bench.c

@@ -76,16 +76,14 @@ static void *thread_func(void *arg)
 
 static void run_test(void)
 {
-    unsigned int remaining;
     unsigned int i;
 
     while (atomic_read(&n_ready_threads) != n_threads) {
         cpu_relax();
     }
+
     atomic_set(&test_start, true);
-    do {
-        remaining = sleep(duration);
-    } while (remaining);
+    g_usleep(duration * G_USEC_PER_SEC);
     atomic_set(&test_stop, true);
 
     for (i = 0; i < n_threads; i++) {

tests/qht-bench.c

@@ -398,16 +398,14 @@ static void pr_stats(void)
 
 static void run_test(void)
 {
-    unsigned int remaining;
     int i;
 
     while (atomic_read(&n_ready_threads) != n_rw_threads + n_rz_threads) {
         cpu_relax();
     }
+
     atomic_set(&test_start, true);
-    do {
-        remaining = sleep(duration);
-    } while (remaining);
+    g_usleep(duration * G_USEC_PER_SEC);
     atomic_set(&test_stop, true);
 
     for (i = 0; i < n_rw_threads; i++) {