X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/blobdiff_plain/0658a929038b8748f5ef610ee5364a8995d60f66..c6fbe95aea00066c24a4d2c2f84bb848374c08c7:/sys/sys/thread.h

diff --git a/sys/sys/thread.h b/sys/sys/thread.h
index 5c26a1c7fd..18baa5733a 100644
--- a/sys/sys/thread.h
+++ b/sys/sys/thread.h
@@ -98,57 +98,26 @@ struct intrframe;
  * Tokens are managed through a helper reference structure, lwkt_tokref,
  * which is typically declared on the caller's stack.  Multiple tokref's
  * may reference the same token.
- *
- * It is possible to detect that your token was temporarily lost via
- * lwkt_token_is_stale(), which uses the t_lastowner field.  This field
- * does NOT necessarily represent the current owner and can become stale
- * (not point to a valid structure).  It is used solely to detect
- * whether the token was temporarily lost to another thread.  The lost
- * state is cleared by the function.
  */
 
 typedef struct lwkt_token {
-#ifdef SMP
-    struct spinlock	t_spinlock;	/* Controls access */
-#else
-    struct spinlock	t_unused01;
-#endif
-    struct thread	*t_owner;	/* The current owner of the token */
-    int			t_count;	/* Per-thread count */
-    struct thread       *t_lastowner;	/* Last owner that acquired token */ 
+    struct lwkt_tokref	*t_ref;		/* Owning ref or NULL */
 } lwkt_token;
 
-#ifdef SMP
-#define LWKT_TOKEN_INITIALIZER(head) \
-{ \
-	.t_spinlock = SPINLOCK_INITIALIZER(head.t_spinlock), \
-	.t_owner = NULL, \
-	.t_lastowner = NULL, \
-	.t_count = 0 \
+#define LWKT_TOKEN_INITIALIZER(head)	\
+{					\
+	.t_ref = NULL			\
 }
-#else
-#define LWKT_TOKEN_INITIALIZER(head) \
-{ \
-	.t_owner = NULL, \
-	.t_lastowner = NULL, \
-	.t_count = 0 \
-}
-#endif
 
-#define ASSERT_LWKT_TOKEN_HELD(token) \
-	KKASSERT((token)->t_owner == curthread)
+#define ASSERT_LWKT_TOKEN_HELD(tok) \
+	KKASSERT((tok)->t_ref->tr_owner == curthread)
 
 typedef struct lwkt_tokref {
     lwkt_token_t	tr_tok;		/* token in question */
+    struct thread	*tr_owner;	/* me */
     lwkt_tokref_t	tr_next;	/* linked list */
-    int			tr_state;	/* 0 = don't have, 1 = have */
 } lwkt_tokref;
 
-#define LWKT_TOKREF_INIT(tok)		\
-			{ tok, NULL, 0 }
-#define LWKT_TOKREF_DECLARE(name, tok)	\
-			lwkt_tokref name = LWKT_TOKREF_INIT(tok)
-
 #define MAXCPUFIFO      16	/* power of 2 */
 #define MAXCPUFIFO_MASK	(MAXCPUFIFO - 1)
 #define LWKT_MAXTOKENS	16	/* max tokens beneficially held by thread */
@@ -211,6 +180,11 @@ typedef struct lwkt_cpu_msg {
  *
  * NOTE: td_pri is bumped by TDPRI_CRIT when entering a critical section,
  * but this does not effect how the thread is scheduled by LWKT.
+ *
+ * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
+ *	 trap, and AST/signal transitions to provide a stable ucred for
+ *	 (primarily) system calls.  This field will be NULL for pure kernel
+ *	 threads.
  */
 struct md_intr_info;
 struct caps_kinfo;
@@ -253,6 +227,7 @@ struct thread {
     struct timeval td_start;	/* start time for a thread/process */
     char	td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
     struct thread *td_preempted; /* we preempted this thread */
+    struct ucred *td_ucred;		/* synchronized from p_ucred */
     struct caps_kinfo *td_caps;	/* list of client and server registrations */
     lwkt_tokref_t td_toks;	/* tokens beneficially held */
 #ifdef DEBUG_CRIT_SECTIONS
@@ -379,10 +354,10 @@ extern void lwkt_relalltokens(thread_t);
 extern void lwkt_drain_token_requests(void);
 extern void lwkt_token_init(lwkt_token_t);
 extern void lwkt_token_uninit(lwkt_token_t);
-extern int  lwkt_token_is_stale(lwkt_tokref_t);
 
 extern void lwkt_token_pool_init(void);
-extern lwkt_token_t lwkt_token_pool_get(void *);
+extern lwkt_token_t lwkt_token_pool_lookup(void *);
+extern void lwkt_getpooltoken(lwkt_tokref_t, void *);
 
 extern void lwkt_setpri(thread_t, int);
 extern void lwkt_setpri_initial(thread_t, int);
@@ -426,8 +401,6 @@ extern int  lwkt_create (void (*func)(void *), void *, struct thread **,
 		         struct thread *, int, int, const char *, ...);
 extern void lwkt_exit (void) __dead2;
 extern void lwkt_remove_tdallq (struct thread *);
-extern void lwkt_mp_lock_contested(void);
-extern void lwkt_mp_lock_uncontested(void);
 
 #endif