src/libs/Pauser.cpp

   1 #include "Pauser.h"
   2
   3 #include "libs/Kernel.h"
   4 #include "Block.h"
   5 #include "libs/nuts_bolts.h"
   6 #include "libs/utils.h"
   7
   8 #include <string>
   9 using namespace std;
  10
  11 // The Pauser module is the core of the pausing subsystem in smoothie. Basically we want several modules to be able to pause smoothie at the same time
  12 // ( think both the user with a button, and the temperature control because a temperature is not reached ). To do that, modules call the take() methode,
  13 // a pause event is called, and the pause does not end before all modules have called the release() method.
  14 // Please note : Modules should keep track of their pause status themselves
  15 Pauser::Pauser(){
  16     paused_block = NULL;
  17 }
  18
  19 void Pauser::on_module_loaded(){
  20     this->counter = 0;
  21     register_for_event(ON_BLOCK_BEGIN);
  22 }
  23
  24 void Pauser::on_block_begin(void* argument)
  25 {
  26     Block* block = static_cast<Block*>(argument);
  27
  28     if (counter)
  29     {
  30         block->take();
  31         paused_block = block;
  32     }
  33 }
  34
  35 // Pause smoothie if nobody else is currently doing so
  36 void Pauser::take(){
  37     this->counter++;
  38     //THEKERNEL->streams->printf("take: %u \r\n", this->counter );
  39     if( this->counter == 1 ){
  40         THEKERNEL->call_event(ON_PAUSE, &this->counter);
  41     }
  42 }
  43
  44 // Unpause smoothie unless something else is pausing it too
  45 void Pauser::release(){
  46     this->counter--;
  47     //THEKERNEL->streams->printf("release: %u \r\n", this->counter );
  48     if( this->counter == 0 ){
  49         THEKERNEL->call_event(ON_PLAY, &this->counter);
  50         if (paused_block)
  51         {
  52             Block* tmp = paused_block;
  53             paused_block = NULL;
  54             tmp->release();
  55         }
  56     }
  57 }
  58
  59 // Return wether smoothie is paused
  60 bool Pauser::paused(){
  61     return (counter != 0);
  62 }