fstime.c - Seperate r/w files for each parallel (#85)

* fstime.c - Seperate r/w files for each parallel

Existing workload is using 1 read file and 1 write file for file
read/write/copy test. In multi-parallel scenario, it leads to
high file lock contention, while read/write/copy is not stressed.

This change seperates r/w files for each parallel to satisfy the
multi-parallel test purpose.

Author: pdeng6

UnixBench/src/fstime.c

@@ -48,8 +48,8 @@ char SCCSid[] = "@(#) @(#)fstime.c:3.5 -- 5/15/91 19:30:19";
 #define COUNTSIZE 256
 #define HALFCOUNT (COUNTSIZE/2)         /* Half of COUNTSIZE */
 
-#define FNAME0  "dummy0"
-#define FNAME1  "dummy1"
+char FNAME0[] = "dummy0-XXXXXXXXXX";
+char FNAME1[] = "dummy1-XXXXXXXXXX";
 
 int w_test(int timeSecs);
 int r_test(int timeSecs);
@@ -170,6 +170,10 @@ char    *argv[];
     }
     */
 
+    int pid = getpid();
+    snprintf(FNAME0 + sizeof("dummy0"), sizeof(FNAME0) - sizeof("dummy0"), "%d", pid);
+    snprintf(FNAME1 + sizeof("dummy1"), sizeof(FNAME1) - sizeof("dummy1"), "%d", pid);
+
     if((f = creat(FNAME0, 0600)) == -1) {
             perror("fstime: creat");
             exit(1);