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

1. Do you really have something like "# ifndef" on line 1, where there's a space between?

2. You cannot use a typedef name before it has been typedef'ed. So TCB isn't a valid name until you get to TCB; at the end of line 59. That does you no good in line 58. You'll have to give the struct a real name, like

Code:

---

typedef struct realname {
  /* all your stuff */
  struct realname *next;
} TCB;

---

The other errors are as if the compiler couldn't find the end of the typedef; fix these other errors first and see what happens.

your recommendation works.
Thank you very much!

but there is still a problem with "warning: invalid white space character in directive" :(

Notice that that's line 1 of "thr_init.c", not this header file. (I didn't notice that the first time either.) So look at that line 1 and take out the illegal space.

The following is my code

Code:

---

1.#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;

        //record start exe time for main thread
        if (gettimeofday(&head->exest, NULL))
        {
      fprintf(stderr, "cannot get start time of main thread\n");
      exit(1);
        }

        //record context
        ucontext_t headcontext;
        if (getcontext(&headcontext)!=0)
        {
                fprintf( stderr, "cannot get context for main thread" );
                exit(1);
        }
        head->context = headcontext;

        //start timer
        time_t n = THR_QUANTUM_DEFAULT;
        thr_quantum(n);
33.}

---

the current problem:
"thr_init.c", line 1: warning: invalid white space character in directive
"thr_init.c", line 33: warning: newline not last character in file

I cannot figure out why it always warns me these :(

Quote:

---

"thr_init.c", line 33: warning: newline not last character in file

---

That one should be easy for you to figure out.

Quote:

---

"thr_init.c", line 1: warning: invalid white space character in directive

---

Did you write this code yourself? What OS and text editor did you use?

Yes.
I write this code by my self
my OS is solaris unix
my text editor is vi

Somehow some weird character got in your file. Does your vi show you [unix] at the bottom when you edit this file? (It would be worse if it said [dos] or [mac], but I think you have to set filemode to automatically show yourself.) It's a silly suggestion, but:
go to line 1 of your .c file
type dd to delete the line
type it in again very carefully
save it and try again

More than that, I don't know.

It would help if you used [code][/code] tags for code, instead of trying to be creative.