src/add-ons/kernel/debugger/invalidate_on_exit/invalidate_on_exit.cpp

   1 /*
   2  * Copyright 2008, Michael Lotz, mmlr@mlotz.ch
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <debug.h>
   8
   9 #include <signal.h>
  10
  11 #include <kscheduler.h>
  12 #include <smp.h>
  13
  14
  15 static sem_id sRequestSem = -1;
  16
  17
  18 static int32
  19 invalidate_loop(void *data)
  20 {
  21         while (true) {
  22                 if (acquire_sem(sRequestSem) != B_OK)
  23                         break;
  24
  25                 uint32 message[3];
  26                 message[0] = sizeof(message);   // size
  27                 message[1] = 'KDLE';                    // message code
  28                 message[2] = 0;                                 // flags
  29
  30                 // where "d:0:baron' stands for desktop x of user y which both
  31                 // currently are hardcoded and where '_PTL' is the port link code
  32                 write_port(find_port("d:0:baron"), '_PTL', &message, sizeof(message));
  33         }
  34
  35         return 0;
  36 }
  37
  38
  39 static void
  40 exit_debugger()
  41 {
  42         release_sem_etc(sRequestSem, 1, B_DO_NOT_RESCHEDULE);
  43 }
  44
  45
  46 static status_t
  47 std_ops(int32 op, ...)
  48 {
  49         if (op == B_MODULE_INIT) {
  50                 sRequestSem = create_sem(0, "invalidate_loop_request");
  51                 if (sRequestSem < B_OK)
  52                         return sRequestSem;
  53
  54                 thread_id thread = spawn_kernel_thread(&invalidate_loop,
  55                         "invalidate_loop", B_NORMAL_PRIORITY, NULL);
  56                 if (thread < B_OK)
  57                         return thread;
  58
  59                 resume_thread(thread);
  60                 return B_OK;
  61         } else if (op == B_MODULE_UNINIT) {
  62                 // deleting the sem will also cause the thread to exit
  63                 delete_sem(sRequestSem);
  64                 sRequestSem = -1;
  65                 return B_OK;
  66         }
  67
  68         return B_BAD_VALUE;
  69 }
  70
  71
  72 static struct debugger_module_info sModuleInfo = {
  73         {
  74                 "debugger/invalidate_on_exit/v1",
  75                 B_KEEP_LOADED,
  76                 &std_ops
  77         },
  78
  79         NULL,
  80         exit_debugger,
  81         NULL,
  82         NULL
  83 };
  84
  85 module_info *modules[] = {
  86         (module_info *)&sModuleInfo,
  87         NULL
  88 };