futex: make clock selectable for FUTEX_WAIT_BITSET

[safe/jmp/linux-2.6] / include / linux / futex.h

diff --git a/include/linux/futex.h b/include/linux/futex.h
index 1bd8dfc..3bf5bb5 100644 (file)
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -1,8 +1,12 @@
 #ifndef _LINUX_FUTEX_H
 #define _LINUX_FUTEX_H
 
-#include <linux/sched.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
 
+struct inode;
+struct mm_struct;
+struct task_struct;
 union ktime;
 
 /* Second argument to futex syscall */
@@ -17,7 +21,23 @@ union ktime;
 #define FUTEX_LOCK_PI          6
 #define FUTEX_UNLOCK_PI                7
 #define FUTEX_TRYLOCK_PI       8
-#define FUTEX_CMP_REQUEUE_PI   9
+#define FUTEX_WAIT_BITSET      9
+#define FUTEX_WAKE_BITSET      10
+
+#define FUTEX_PRIVATE_FLAG     128
+#define FUTEX_CLOCK_REALTIME   256
+#define FUTEX_CMD_MASK         ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)
+
+#define FUTEX_WAIT_PRIVATE     (FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAKE_PRIVATE     (FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
+#define FUTEX_REQUEUE_PRIVATE  (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG)
+#define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAKE_OP_PRIVATE  (FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG)
+#define FUTEX_LOCK_PI_PRIVATE  (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG)
+#define FUTEX_UNLOCK_PI_PRIVATE        (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG)
+#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAIT_BITSET_PRIVATE      (FUTEX_WAIT_BITS | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAKE_BITSET_PRIVATE      (FUTEX_WAKE_BITS | FUTEX_PRIVATE_FLAG)
 
 /*
  * Support for robust futexes: the kernel cleans up held futexes at
@@ -86,14 +106,9 @@ struct robust_list_head {
 #define FUTEX_OWNER_DIED       0x40000000
 
 /*
- * Some processes have been requeued on this PI-futex
- */
-#define FUTEX_WAITER_REQUEUED  0x20000000
-
-/*
  * The rest of the robust-futex field is for the TID:
  */
-#define FUTEX_TID_MASK         0x0fffffff
+#define FUTEX_TID_MASK         0x3fffffff
 
 /*
  * This limit protects against a deliberately circular list.
@@ -101,6 +116,12 @@ struct robust_list_head {
  */
 #define ROBUST_LIST_LIMIT      2048
 
+/*
+ * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a
+ * match of any bit.
+ */
+#define FUTEX_BITSET_MATCH_ANY 0xffffffff
+
 #ifdef __KERNEL__
 long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout,
              u32 __user *uaddr2, u32 val2, u32 val3);
@@ -114,10 +135,19 @@ handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);
  * Don't rearrange members without looking at hash_futex().
  *
  * offset is aligned to a multiple of sizeof(u32) (== 4) by definition.
- * We set bit 0 to indicate if it's an inode-based key.
- */
+ * We use the two low order bits of offset to tell what is the kind of key :
+ *  00 : Private process futex (PTHREAD_PROCESS_PRIVATE)
+ *       (no reference on an inode or mm)
+ *  01 : Shared futex (PTHREAD_PROCESS_SHARED)
+ *     mapped on a file (reference on the underlying inode)
+ *  10 : Shared futex (PTHREAD_PROCESS_SHARED)
+ *       (but private mapping on an mm, and reference taken on it)
+*/
+
+#define FUT_OFF_INODE    1 /* We set bit 0 if key has a reference on inode */
+#define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */
+
 union futex_key {
-       u32 __user *uaddr;
        struct {
                unsigned long pgoff;
                struct inode *inode;
@@ -134,13 +164,13 @@ union futex_key {
                int offset;
        } both;
 };
-int get_futex_key(u32 __user *uaddr, union futex_key *key);
-void get_futex_key_refs(union futex_key *key);
-void drop_futex_key_refs(union futex_key *key);
+
+#define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } }
 
 #ifdef CONFIG_FUTEX
 extern void exit_robust_list(struct task_struct *curr);
 extern void exit_pi_state_list(struct task_struct *curr);
+extern int futex_cmpxchg_enabled;
 #else
 static inline void exit_robust_list(struct task_struct *curr)
 {