1 files changed, 52 insertions, 0 deletions
diff --git a/src/examples/parent.c b/src/examples/parent.c
new file mode 100644
index 0000000..df0e8f7
--- /dev/null
+++ b/src/examples/parent.c
@@ -0,0 +1,52 @@
+/* klaar@ida
+
+   pintos -v -k --fs-disk=2 --qemu -p ../examples/parent -a parent -p ../examples/child -a child -- -f -q run parent | grep PASS > result.txt
+   grep -c 'Lab 0' result.txt
+   grep -c 'Lab 1' result.txt
+   grep -c 'Lab 2' result.txt
+   grep -c 'Lab 3' result.txt
+   
+   A test program that calls itself recursively. In the last step of
+   the recursion child.c is started. Do not use with large values for
+   CHILDREN or DEPTH.
+
+   Shall produce 64 PASS messages, 16 of each, when CHILDREN=4 and DEPTH=3
+
+   CHILDREN^DEPTH=count(PASS) (4^3=64)
+*/
+#include <syscall.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define CHILDREN 4
+#define DEPTH 3
+
+int main(int argc, char* argv[])
+{
+  int i;
+  int pid[CHILDREN];
+  int depth = DEPTH - 1;
+  char cmd[10];
+
+  if (argc == 2)
+    depth = atoi(argv[1]) - 1;
+  
+  for(i = 0; i < CHILDREN; i++)
+  {
+    if (depth)
+      snprintf(cmd, 10, "parent %i", depth);
+    else
+      snprintf(cmd, 10, "child %i", i);
+
+    printf("%s\n", cmd);
+    pid[i] = exec(cmd);
+  }
+//  if (depth <= 1)
+  {
+    for(i = 0; i < CHILDREN; i++)
+    {
+      wait(pid[i]);
+    }
+  }
+  exit(0);
+}