#include "classes.h"
#include "language.h"
#include "constants.h"
#include "trace.h"

#ifndef _THREADS_H
#define _THREADS_H

#define NEW              0 // Just been created
#define DEAD             1 // run() has exited
#define STARTED          2 // start() has been called but we haven't run yet
#define RUNNING          3 // We're running!
#define MON_WAITING      4 // Trying to enter a synchronized block
#define CONDVAR_WAITING  5 // Someone called wait() on us in a synchronized block.
#define SLEEPING         6 // ZZZZZzzzzzzzz

#define INTERRUPT_CLEARED    0
#define INTERRUPT_REQUESTED  1
#define INTERRUPT_GRANTED    2

// These values must match the statics in Thread.java
#define MIN_PRIORITY  1
#define NORM_PRIORITY 5
#define MAX_PRIORITY  10

#define SF_SIZE (sizeof(StackFrame))

extern Thread *currentThread;
extern Thread *bootThread;
extern byte gThreadCounter;
extern Thread *threadQ[];
extern byte gProgramNumber;
extern boolean gRequestSuicide;

/**
 * A stack frame record
 */
typedef struct S_StackFrame
{
  MethodRecord *methodRecord;
  // Object's monitor if method is synchronized
  Object *monitor;
  // The following field is constant for a given stack frame.
  STACKWORD *localsBase;
  // The following fields only need to be assigned to on switch_thread.
  byte *pc;
  STACKWORD *stackTop;
} StackFrame;

extern boolean init_thread (Thread *thread);
extern StackFrame *current_stackframe();
extern void enter_monitor (Thread *pThread, Object* obj);
extern void exit_monitor (Thread *pThread, Object* obj);
extern boolean switch_thread();
extern void join_thread(Thread *thread);
extern void dequeue_thread(Thread *thread);
extern void enqueue_thread(Thread *thread);
extern void monitor_wait(Object *obj, const FOURBYTES time);
extern void monitor_notify(Object *obj, const boolean all);
extern void monitor_notify_unchecked(Object *obj, const boolean all);

#define stackframe_array_ptr()   (word2ptr(currentThread->stackFrameArray))
#define stack_array_ptr()        (word2ptr(currentThread->stackArray))
#define is_reference_array_ptr() (word2ptr(currentThread->isReferenceArray))
#define stackframe_array()       ((StackFrame *) ((byte *) stackframe_array_ptr() + HEADER_SIZE))
#define stack_array()            ((STACKWORD *) ((byte *) stack_array_ptr() + HEADER_SIZE))
#define is_reference_array()     ((JBYTE *) ((byte *) is_reference_array_ptr() + HEADER_SIZE))
#define set_program_number(N_)   {gProgramNumber = (N_);}
#define inc_program_number()     {if (++gProgramNumber >= get_num_entry_classes()) gProgramNumber = 0;}
#define get_program_number()     gProgramNumber 

static inline void init_threads()
{
  int i;
  Thread **pQ = threadQ;
  gThreadCounter = 0;
  currentThread = JNULL;
  for (i = 0; i<10; i++)
  {
    *pQ++ = null;
  }
}

/**
 * Sets thread state to SLEEPING.
 * Thread should be switched immediately after calling this method.
 */
static inline void sleep_thread (const FOURBYTES time)
{
  #ifdef VERIFY
  assert (currentThread != JNULL, THREADS3);
  assert (currentThread->state != MON_WAITING, THREADS9);
  #endif

  currentThread->state = SLEEPING;
  currentThread->sleepUntil = get_sys_time() + time; 	
}

static inline int get_thread_priority(Thread *thread)
{
  #if DEBUG_THREADS
  printf("Thread priority is %d\n", thread->priority);
  #endif
  return thread->priority;
}

/**
 * Mark thread as interrupted.
 */
static inline void interrupt_thread(Thread *thread)
{
  thread->interruptState = INTERRUPT_REQUESTED;
}

extern void set_thread_priority(Thread *thread, const FOURBYTES priority);

#endif