diff -ruN kozos25/extintr.c kozos27/extintr.c
--- kozos25/extintr.c	Sun Dec  9 22:19:16 2007
+++ kozos27/extintr.c	Sun Dec  9 22:46:18 2007
@@ -125,7 +125,8 @@
 {
   fd_set fds;
   char *p, *buffer;
-  int fd, id, ret, cnt_fd = -1, size, s, len;
+  int fd, id, ret, cnt_fd = -1, size, s;
+  socklen_t len;
   struct timeval tm = {0, 0};
   intrbuf *ibp;
   int fildes[2];
diff -ruN kozos25/i386-stub.c kozos27/i386-stub.c
--- kozos25/i386-stub.c	Sun Dec  9 22:19:16 2007
+++ kozos27/i386-stub.c	Sun Dec  9 22:26:41 2007
@@ -1075,17 +1075,12 @@
 		if (mode & TAG_DISPLAY) {
 		  ptr = intNToHex(ptr, TAG_DISPLAY, 4); /* mode */
 		  ptr = intNToHex(ptr, 3, 1); /* length */
-		  {
-		    kz_thread *thp2;
+		  if (thp->flags & KZ_THREAD_FLAG_RUNNING) {
+		    strcpy(ptr, "RUN");
+		  } else {
 		    strcpy(ptr, "SLP");
-		    for (thp2 = readyque[thp->pri]; thp2; thp2 = thp2->next) {
-		      if (thp == thp2) {
-			strcpy(ptr, "RUN");
-			break;
-		      }
-		    }
-		    ptr += strlen(ptr);
 		  }
+		  ptr += strlen(ptr);
 		}
 		if (mode & TAG_THREADNAME) {
 		  ptr = intNToHex(ptr, TAG_THREADNAME, 4); /* mode */
diff -ruN kozos25/stubd.c kozos27/stubd.c
--- kozos25/stubd.c	Sun Dec  9 22:19:16 2007
+++ kozos27/stubd.c	Sun Dec  9 22:46:55 2007
@@ -14,7 +14,8 @@
 
 int stubd_main(int argc, char *argv[])
 {
-  int sockt, s, ret, len;
+  int sockt, s, ret;
+  socklen_t len;
   char hostname[256];
   struct hostent *host;
   struct sockaddr_in address;
diff -ruN kozos25/thread.c kozos27/thread.c
--- kozos25/thread.c	Sun Dec  9 22:19:16 2007
+++ kozos27/thread.c	Mon Dec 10 20:23:28 2007
@@ -20,7 +20,10 @@
 } kz_timebuf;
 
 kz_thread threads[THREAD_NUM];
-kz_thread *readyque[PRI_NUM];
+static struct {
+  kz_thread *head;
+  kz_thread *tail;
+} readyque[PRI_NUM];
 static kz_timebuf *timers;
 static kz_thread *sigcalls[SIG_NUM];
 static int debug_sockt = 0;
@@ -31,18 +34,28 @@
 
 static void getcurrent()
 {
-  readyque[current->pri] = current->next;
+  readyque[current->pri].head = current->next;
+  if (readyque[current->pri].head == NULL)
+    readyque[current->pri].tail = NULL;
+  current->flags &= ~KZ_THREAD_FLAG_RUNNING;
   current->next = NULL;
 }
 
 static int putcurrent()
 {
-  kz_thread **thpp;
-  for (thpp = &readyque[current->pri]; *thpp; thpp = &((*thpp)->next)) {
+  if (current->flags & KZ_THREAD_FLAG_RUNNING) {
     /* すでに有る場合は無視 */
-    if (*thpp == current) return -1;
+    return -1;
+  }
+
+  if (readyque[current->pri].tail) {
+    readyque[current->pri].tail->next = current;
+  } else {
+    readyque[current->pri].head = current;
   }
-  *thpp = current;
+  readyque[current->pri].tail = current;
+  current->flags |= KZ_THREAD_FLAG_RUNNING;
+
   return 0;
 }
 
@@ -153,8 +166,10 @@
 {
   kz_membuf *mp;
 
-  mp = current->messages;
-  current->messages = mp->next;
+  mp = current->messages.head;
+  current->messages.head = mp->next;
+  if (current->messages.head == NULL)
+    current->messages.tail = NULL;
   mp->next = NULL;
 
   current->syscall.param->un.recv.ret = mp->size;
@@ -168,7 +183,6 @@
 static void sendmsg(kz_thread *thp, int id, int size, char *p)
 {
   kz_membuf *mp;
-  kz_membuf **mpp;
 
   current = thp;
 
@@ -181,9 +195,13 @@
   mp->size = size;
   mp->id = id;
   mp->p = p;
-  for (mpp = &current->messages; *mpp; mpp = &((*mpp)->next))
-    ;
-  *mpp = mp;
+
+  if (current->messages.tail) {
+    current->messages.tail->next = mp;
+  } else {
+    current->messages.head = mp;
+  }
+  current->messages.tail = mp;
 
   if (putcurrent() == 0) {
     /* 受信する側がブロック中の場合には受信処理を行う */
@@ -200,7 +218,7 @@
 
 static int thread_recv(int *idp, char **pp)
 {
-  if (current->messages == NULL) {
+  if (current->messages.head == NULL) {
     /* メッセージが無いのでブロックする */
     return -1;
   }
@@ -218,6 +236,7 @@
   kz_timebuf *tmp;
   struct timeval tm;
   int diffmsec;
+  struct itimerval itm;
 
   tmp = malloc(sizeof(*tmp));
   tmp->next = NULL;
@@ -247,8 +266,13 @@
   *tmpp = tmp;
 
   alarm_tm = tm;
-  if (tmpp == &timers)
-    ualarm(timers->msec * 1000, 0);
+  if (tmpp == &timers) {
+    itm.it_interval.tv_sec  = 0;
+    itm.it_interval.tv_usec = 0;
+    itm.it_value.tv_sec     =  timers->msec / 1000;
+    itm.it_value.tv_usec    = (timers->msec % 1000) * 1000;
+    setitimer(ITIMER_REAL, &itm, NULL);
+  }
 
   putcurrent();
   return 0;
@@ -257,6 +281,7 @@
 static void alarm_handler()
 {
   kz_timebuf *tmp;
+  struct itimerval itm;
 
   sendmsg(timers->thp, 0, 0, NULL);
   tmp = timers;
@@ -264,14 +289,18 @@
   free(tmp);
   if (timers) {
     gettimeofday(&alarm_tm, NULL);
-    ualarm(timers->msec * 1000, 0);
+    itm.it_interval.tv_sec  = 0;
+    itm.it_interval.tv_usec = 0;
+    itm.it_value.tv_sec     =  timers->msec / 1000;
+    itm.it_value.tv_usec    = (timers->msec % 1000) * 1000;
+    setitimer(ITIMER_REAL, &itm, NULL);
   }
 }
 
 static int thread_pending()
 {
   putcurrent();
-  return current->messages ? 1 : 0;
+  return current->messages.head ? 1 : 0;
 }
 
 static int thread_setsig(int signo)
@@ -373,13 +402,13 @@
 {
   int i;
   for (i = 0; i < PRI_NUM; i++) {
-    if (readyque[i]) break;
+    if (readyque[i].head) break;
   }
   if (i == PRI_NUM) {
     /* 実行可能なスレッドが存在しないので，終了する */
     exit(0);
   }
-  current = readyque[i];
+  current = readyque[i].head;
 }
 
 static void thread_intrvec(int signo)
diff -ruN kozos25/thread.h kozos27/thread.h
--- kozos25/thread.h	Sun Dec  9 22:19:16 2007
+++ kozos27/thread.h	Mon Dec 10 20:19:06 2007
@@ -26,13 +26,18 @@
   kz_func func;
   int pri;
   char *stack;
+  unsigned int flags;
+#define KZ_THREAD_FLAG_RUNNING (1 << 0)
 
   struct {
     kz_syscall_type_t type;
     kz_syscall_param_t *param;
   } syscall;
 
-  kz_membuf *messages;
+  struct {
+    kz_membuf *head;
+    kz_membuf *tail;
+  } messages;
 
   struct {
     ucontext_t uap;
@@ -40,7 +45,6 @@
 } kz_thread;
 
 extern kz_thread threads[THREAD_NUM];
-extern kz_thread *readyque[PRI_NUM];
 extern kz_thread *current;
 extern sigset_t block;