Thread: problem with struct?

It seems that there is some problem with struct TCB
but I cannot find out what's wrong with it.
Please help!
Thank you very much!

The head file is the following:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Code:

#ifndef UTHREAD_H 
#define UTHREAD_H 

#include <stdio.h> 
#include <ucontext.h> 
#include <semaphore.h> 
#include <unistd.h> 
#include <stdlib.h> 
#include <errno.h> 
#include <signal.h> 
#include <sys/time.h> 

/* you might find some of these definitions helpful */ 
#define THR_QUANTUM_DEFAULT 5 /* default time quantum ms */ 
#define THR_STACK_DEFAULT 65536 /* default stack bytes */ 
#define THR_FAILURE -1 /* unable to create thread */ 
#define THR_NOSUCHTHREAD -1 /* bad access to thread */ 
#define MAX_JOIN_NUM 100 //maximum joinalbe number of thread 
#define MILLION 1000000L    //convert sec to msec 

#ifdef __CPLUS_PLUS__ 
// C++:  Provide C linkages 
namespace "std" { 
  extern "C" { 
#endif 

    typedef int ThreadId_t; 

    /* thread states */ 
    typedef enum { 
      BLOCKED, /* blocked */ 
      RUNNING, /* currently dispatched */ 
      READY, /* in ready queue */ 
      COMPLETED, /* returned from thread */ 
      KILLED, /* killed by another thread 
* (you don't need to implement this one) 
*/ 
    } ThreadState_t; 

typedef enum { 
      THR_QUIET, /* no information */ 
      THR_SWITCH, /* report thread switch */ 
      THR_SUMMARY /* provide the same information as in thr_summary */ 
    } thr_diagnostic_t; 
  
    /* Thread control block 
    * Add to this structure as you see fit, but you may not 
    * change the name 
    */ 
    typedef struct { 
      ThreadId_t  id; /* unique identifier */ 
      ThreadState_t state; 
  ucontext_t context; //record context 
  void *result; //record final result 
  ThreadId_t j[MAX_JOIN_NUM]; //maxinum number of joinable thread for thr_join 
  int acn; //record the active number of thread 
  struct timeval exest; //record start of exe time 
  struct timeval exendt; //record end of exe time 
  struct timeval qust; //record start time in READY queue 
  long qtime; //record end time in READY queue 
  thr_diagnostic_t debug; //set debug 
  double acw; //average context switch time 
58   TCB *next; 
    } TCB; 

TCB *head; 


64    void thr_init(); /* Initialize thread package */ 
    
65    void thr_quantum(int N_ms);   /* Set time quantum to N ms */ 

66    ThreadId_t thr_create(void * (*start_fn)(void *), void *arg); 

67    void thr_exit(void *result); 

68    int thr_join(ThreadId_t id, void **result); 

69    void thr_diagnostics(thr_diagnostic_t Verbosity); 

70    void thr_summary(FILE *FileHandle); 
#ifdef __CPLUS_PLUS 
  } 
} 
#endif 
  
#endif

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

thr_init.c is the following:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Code:

#include "uthread.h" 

void thr_init() 
{ 
// initiate thread queue 
head = (TCB *)malloc(sizeof(TCB)); 
head->next = NULL; 
head->id = 0; 
head->state = RUNNING; 
head->result = NULL; 
head->acn = 1; 
head->qtime = 0; 

。。。。。。。。。。。。。。 
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
when I compile, the following problems always comes out:
"thr_init.c", line 1: warning: invalid white space character in directive （why it is invalid?）
"uthread.h", line 58: syntax error before or at: TCB
"uthread.h", line 64: member cannot be function: thr_init
"uthread.h", line 65: member cannot be function: thr_quantum
"uthread.h", line 66: member cannot be function: thr_create
"uthread.h", line 67: member cannot be function: thr_exit
"uthread.h", line 68: member cannot be function: thr_join
"uthread.h", line 69: member cannot be function: thr_diagnostics
"uthread.h", line 70: member cannot be function: thr_summary