Fix race condition, can increment no. of logs before assignment, so they need to be initially NULL

swiftmpistepsim.c

@@ -321,14 +321,14 @@ static void pick_logs(void) {
   size_t nlogs = mpiuse_nr_logs();
 
   /* Duplicate of logs. */
-  reqs_queue = (struct mpiuse_log_entry **)malloc(
-      sizeof(struct mpiuse_log_entry *) * nlogs);
+  reqs_queue = (struct mpiuse_log_entry **)calloc(
+      nlogs, sizeof(struct mpiuse_log_entry *));
   nr_reqs = 0;
-  sends_queue = (struct mpiuse_log_entry **)malloc(
-      sizeof(struct mpiuse_log_entry *) * nlogs);
+  sends_queue = (struct mpiuse_log_entry **)calloc(
+      nlogs, sizeof(struct mpiuse_log_entry *) * nlogs);
   nr_sends = 0;
-  recvs_queue = (struct mpiuse_log_entry **)malloc(
-      sizeof(struct mpiuse_log_entry *) * nlogs);
+  recvs_queue = (struct mpiuse_log_entry **)calloc(
+      nlogs, sizeof(struct mpiuse_log_entry *));
   nr_recvs = 0;
 
   for (int k = 0; k < nlogs; k++) {
@@ -354,8 +354,9 @@ static void pick_logs(void) {
 
   /* Check. */
   for (int k = 0; k < nr_reqs - 1; k++) {
-    if (reqs_queue[k]->tic > reqs_queue[k+1]->tic)
-      message("reqs_queue: %lld > %lld", reqs_queue[k]->tic, reqs_queue[k+1]->tic);
+    if (reqs_queue[k]->tic > reqs_queue[k + 1]->tic)
+      message("reqs_queue: %lld > %lld", reqs_queue[k]->tic,
+              reqs_queue[k + 1]->tic);
   }
 }