- lower buzy_process priority below timer interrupt priority to prevent
uninterruptible while(1); loop on RT systems
- synchronize thread start to run test properly
--
Stefan Assmann | SUSE LINUX Products GmbH
Software Engineer | Maxfeldstr. 5, D-90409 Nuernberg
Mail : [EMAIL PROTECTED] | GF: Markus Rex, HRB 16746 (AG Nuernberg)
Index: ltp-full-20061017/testcases/open_posix_testsuite/conformance/interfaces/sched_yield/1-1.c
===================================================================
--- ltp-full-20061017.orig/testcases/open_posix_testsuite/conformance/interfaces/sched_yield/1-1.c
+++ ltp-full-20061017/testcases/open_posix_testsuite/conformance/interfaces/sched_yield/1-1.c
@@ -50,6 +50,9 @@
#define LOOP 1000 /* Shall be >= 1 */
+static pthread_mutex_t start_spinner;
+static pthread_cond_t start_cond;
+static int ready;
volatile int nb_call = 0;
/* Get the number of CPUs */
@@ -131,11 +134,12 @@ int set_thread_affinity(int cpu)
void * runner(void * arg) {
int i=0, nc;
long result = 0;
+
#ifdef LINUX
set_thread_affinity(*(int *)arg);
fprintf(stderr, "%ld bind to cpu: %d\n", pthread_self(), *(int*)arg);
#endif
-
+
for(;i<LOOP;i++){
nc = nb_call;
sched_yield();
@@ -154,11 +158,17 @@ void * runner(void * arg) {
}
void * busy_thread(void *arg){
+
#ifdef LINUX
set_thread_affinity(*(int *)arg);
fprintf(stderr, "%ld bind to cpu: %d\n", pthread_self(), *(int*)arg);
#endif
- while(1){
+
+ pthread_mutex_lock(&start_spinner);
+ ready=1;
+ pthread_cond_signal(&start_cond);
+ pthread_mutex_unlock(&start_spinner);
+ while(1){
nb_call++;
sched_yield();
}
@@ -175,7 +185,9 @@ void buzy_process(int cpu){
set_process_affinity(cpu);
fprintf(stderr, "%d bind to cpu: %d\n", getpid(), cpu);
#endif
- param.sched_priority = sched_get_priority_max(SCHED_FIFO);
+ /* this priority should be below the priority of the timer
+ * interrupt to avoid an uninterruptible while(1); loop */
+ param.sched_priority = sched_get_priority_min(SCHED_FIFO) + 2;
if(sched_setscheduler(getpid(), SCHED_FIFO, ¶m) != 0) {
perror("An error occurs when calling sched_setparam()");
return;
@@ -198,6 +210,8 @@ int main() {
struct sched_param param;
int thread_cpu;
+ pthread_cond_init(&start_cond, NULL);
+ pthread_mutex_init(&start_spinner, NULL);
ncpu = get_ncpu();
if(ncpu == -1) {
@@ -242,6 +256,11 @@ int main() {
perror("An error occurs when calling pthread_create()");
return PTS_UNRESOLVED;
}
+
+ pthread_mutex_lock(&start_spinner);
+ while(!ready)
+ pthread_cond_wait(&start_cond, &start_spinner);
+ pthread_mutex_unlock(&start_spinner);
if(pthread_create(&tid_runner, &attr, runner, &thread_cpu) != 0) {
perror("An error occurs when calling pthread_create()");
@@ -257,6 +276,10 @@ int main() {
waitpid(child_pid[i], NULL, 0);
result = (long)tmpresult;
+
+ pthread_cond_destroy(&start_cond);
+ pthread_mutex_destroy(&start_spinner);
+
if(result){
printf("A thread does not relinquish the processor.\n");
return PTS_FAIL;
-------------------------------------------------------------------------
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