#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 */
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
#define FUTEX_WAKE_OP 5
+#define FUTEX_LOCK_PI 6
+#define FUTEX_UNLOCK_PI 7
+#define FUTEX_TRYLOCK_PI 8
+#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
#define FUTEX_OWNER_DIED 0x40000000
/*
- * Reserved bit:
+ * The rest of the robust-futex field is for the TID:
*/
-#define FUTEX_OWNER_PENDING 0x20000000
+#define FUTEX_TID_MASK 0x3fffffff
/*
- * The rest of the robust-futex field is for the TID:
+ * This limit protects against a deliberately circular list.
+ * (Not worth introducing an rlimit for it)
*/
-#define FUTEX_TID_MASK 0x1fffffff
+#define ROBUST_LIST_LIMIT 2048
/*
- * A limit of one million locks held per thread (!) ought to be enough
- * for some time. This also protects against a deliberately circular
- * list. Not worth introducing an rlimit for this:
+ * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a
+ * match of any bit.
*/
-#define ROBUST_LIST_LIMIT 1048576
+#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);
+
+extern int
+handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);
-long do_futex(unsigned long uaddr, int op, int val,
- unsigned long timeout, unsigned long uaddr2, int val2,
- int val3);
+/*
+ * Futexes are matched on equal values of this key.
+ * The key type depends on whether it's a shared or private mapping.
+ * Don't rearrange members without looking at hash_futex().
+ *
+ * offset is aligned to a multiple of sizeof(u32) (== 4) by definition.
+ * 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 {
+ struct {
+ unsigned long pgoff;
+ struct inode *inode;
+ int offset;
+ } shared;
+ struct {
+ unsigned long address;
+ struct mm_struct *mm;
+ int offset;
+ } private;
+ struct {
+ unsigned long word;
+ void *ptr;
+ int offset;
+ } both;
+};
-extern int handle_futex_death(u32 __user *uaddr, struct task_struct *curr);
+#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)
{
}
+static inline void exit_pi_state_list(struct task_struct *curr)
+{
+}
#endif
+#endif /* __KERNEL__ */
#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */