1 files changed, 89 insertions, 0 deletions
diff --git a/src/examples/longrun_nowait.c b/src/examples/longrun_nowait.c
new file mode 100644
index 0000000..4c78b2e
--- /dev/null
+++ b/src/examples/longrun_nowait.c
@@ -0,0 +1,89 @@
+/* klaar@ida
+
+   pintos -v -k --fs-disk=2 --qemu -p ../examples/longrun_nowait -a nowait -p ../examples/generic_parent -a generic_parent -p ../examples/busy -a dummy -- -f -q run 'nowait 10 50'
+
+   Start a lot of processes and let them finish to test if we
+   eventually run out of process slots.
+ 
+    'longrun_nowait 10 50'
+ 
+   Will call generic_parent to start 10 children 50 times (500
+   processes). One slot will be used by longrun_nowait itself. 50
+   slots will be used by generic_parent (they must be kept so long as
+   longrun_nowait still execute, since it may want to wait for any of
+   them). All other slots needed should also be freed as soon as both
+   generic_parent and it's set of children exits.
+  
+   To run the test effectively, if you have a limit on number of
+   processes, lower that limit to 61 processes and run this test like
+ 
+    'longrun_nowait 10 50'
+ 
+   Note that some pintos tests requires at least 16 simultaneous
+   processes to work, so be sure to increase the limit before running
+   pintos tests.   
+ */
+
+#include <syscall.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define MAX_SIMULTANEOUS 50
+#define MAX_REPEAT 1000
+#define BUF_SIZE 64
+
+int main(int argc, char* argv[])
+{
+  char cmd[BUF_SIZE];
+  unsigned j = 0;
+  unsigned simul = 0;
+  unsigned repeat = 0;
+
+  if (argc != 3)
+  {
+    printf("Usage: %s simultaneous repeat\n"
+           "Where 'simultaneous' is the number of simultaneous processes to \n"
+           "start before busywaiting a short while, and 'repeat' how many \n"
+           "times this should be repeated.\n", argv[0]
+      );
+    return -1;
+  }
+
+  simul = atoi(argv[1]);
+  repeat = atoi(argv[2]);
+
+  if (simul > MAX_SIMULTANEOUS)
+  {
+    printf("This test program is compiled with a limitation to max %d \n"
+           "simultaneos processes.\n", MAX_SIMULTANEOUS);
+    return -1;
+  }
+  
+  if (repeat > MAX_REPEAT)
+  {
+    printf("This test program is compiled with a limitation to max %d \n"
+           "repetitions.\n", MAX_REPEAT);
+    return -1;
+  }
+  
+  printf("Will try to start a total of %d processes in groups of %d\n",
+         simul * repeat, simul);
+  
+  for (j = 0; j < repeat; ++j)
+  {
+    /* you may have to increase the multiple to more than 5 */
+    int ticks = 10 * 1000 * 1000 * j / repeat;
+    
+    snprintf(cmd, BUF_SIZE, "generic_parent %s %i %i", "dummy", j*simul, simul);
+    
+    exec(cmd);
+    
+//    plist();
+
+    /* since we do not have the wait systemcall yet */
+    printf("Now entering busy-loop to let some processes finish\n");
+    while (ticks--)
+      ;
+  }
+  return 0;
+}