DO NOT MERGE Put a small sleep back in the start of toolbox top.

We saw a divide-by-zero crash that we can't reproduce, and having some
delay between scans of /proc should give us better data anyway.

Bug: http://b/32478213
Test: manual
Change-Id: If57720c57113a966b86022291c5be57127852427

toolbox/top.c

@@ -31,6 +31,7 @@
 
 #include <ctype.h>
 #include <dirent.h>
+#include <errno.h>
 #include <grp.h>
 #include <inttypes.h>
 #include <pwd.h>
@@ -38,6 +39,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
+#include <time.h>
 #include <unistd.h>
 
 #include <cutils/sched_policy.h>
@@ -180,6 +182,11 @@ int top_main(int argc, char *argv[]) {
     new_procs = old_procs = NULL;
 
     read_procs();
+
+    // Pause 250ms to get better data and avoid divide by zero later (http://b/32478213).
+    struct timespec ts = { .tv_sec = 0, .tv_nsec = 250000000 };
+    TEMP_FAILURE_RETRY(nanosleep(&ts, &ts));
+
     while ((iterations == -1) || (iterations-- > 0)) {
         old_procs = new_procs;
         num_old_procs = num_new_procs;