LCOV - code coverage report
Current view: top level - include/linux - futex.h (source / functions) Hit Total Coverage
Test: gcov_data_raspi2_real_modules_combined.info Lines: 5 5 100.0 %
Date: 2020-09-30 20:25:40 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _LINUX_FUTEX_H
       3                 :            : #define _LINUX_FUTEX_H
       4                 :            : 
       5                 :            : #include <linux/sched.h>
       6                 :            : #include <linux/ktime.h>
       7                 :            : 
       8                 :            : #include <uapi/linux/futex.h>
       9                 :            : 
      10                 :            : struct inode;
      11                 :            : struct mm_struct;
      12                 :            : struct task_struct;
      13                 :            : 
      14                 :            : /*
      15                 :            :  * Futexes are matched on equal values of this key.
      16                 :            :  * The key type depends on whether it's a shared or private mapping.
      17                 :            :  * Don't rearrange members without looking at hash_futex().
      18                 :            :  *
      19                 :            :  * offset is aligned to a multiple of sizeof(u32) (== 4) by definition.
      20                 :            :  * We use the two low order bits of offset to tell what is the kind of key :
      21                 :            :  *  00 : Private process futex (PTHREAD_PROCESS_PRIVATE)
      22                 :            :  *       (no reference on an inode or mm)
      23                 :            :  *  01 : Shared futex (PTHREAD_PROCESS_SHARED)
      24                 :            :  *      mapped on a file (reference on the underlying inode)
      25                 :            :  *  10 : Shared futex (PTHREAD_PROCESS_SHARED)
      26                 :            :  *       (but private mapping on an mm, and reference taken on it)
      27                 :            : */
      28                 :            : 
      29                 :            : #define FUT_OFF_INODE    1 /* We set bit 0 if key has a reference on inode */
      30                 :            : #define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */
      31                 :            : 
      32                 :            : union futex_key {
      33                 :            :         struct {
      34                 :            :                 u64 i_seq;
      35                 :            :                 unsigned long pgoff;
      36                 :            :                 unsigned int offset;
      37                 :            :         } shared;
      38                 :            :         struct {
      39                 :            :                 union {
      40                 :            :                         struct mm_struct *mm;
      41                 :            :                         u64 __tmp;
      42                 :            :                 };
      43                 :            :                 unsigned long address;
      44                 :            :                 unsigned int offset;
      45                 :            :         } private;
      46                 :            :         struct {
      47                 :            :                 u64 ptr;
      48                 :            :                 unsigned long word;
      49                 :            :                 unsigned int offset;
      50                 :            :         } both;
      51                 :            : };
      52                 :            : 
      53                 :            : #define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = 0ULL } }
      54                 :            : 
      55                 :            : #ifdef CONFIG_FUTEX
      56                 :            : enum {
      57                 :            :         FUTEX_STATE_OK,
      58                 :            :         FUTEX_STATE_EXITING,
      59                 :            :         FUTEX_STATE_DEAD,
      60                 :            : };
      61                 :            : 
      62                 :            : static inline void futex_init_task(struct task_struct *tsk)
      63                 :            : {
      64                 :     201489 :         tsk->robust_list = NULL;
      65                 :            : #ifdef CONFIG_COMPAT
      66                 :            :         tsk->compat_robust_list = NULL;
      67                 :            : #endif
      68                 :     201489 :         INIT_LIST_HEAD(&tsk->pi_state_list);
      69                 :     201489 :         tsk->pi_state_cache = NULL;
      70                 :     201489 :         tsk->futex_state = FUTEX_STATE_OK;
      71                 :     201489 :         mutex_init(&tsk->futex_exit_mutex);
      72                 :            : }
      73                 :            : 
      74                 :            : void futex_exit_recursive(struct task_struct *tsk);
      75                 :            : void futex_exit_release(struct task_struct *tsk);
      76                 :            : void futex_exec_release(struct task_struct *tsk);
      77                 :            : 
      78                 :            : long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
      79                 :            :               u32 __user *uaddr2, u32 val2, u32 val3);
      80                 :            : #else
      81                 :            : static inline void futex_init_task(struct task_struct *tsk) { }
      82                 :            : static inline void futex_exit_recursive(struct task_struct *tsk) { }
      83                 :            : static inline void futex_exit_release(struct task_struct *tsk) { }
      84                 :            : static inline void futex_exec_release(struct task_struct *tsk) { }
      85                 :            : static inline long do_futex(u32 __user *uaddr, int op, u32 val,
      86                 :            :                             ktime_t *timeout, u32 __user *uaddr2,
      87                 :            :                             u32 val2, u32 val3)
      88                 :            : {
      89                 :            :         return -EINVAL;
      90                 :            : }
      91                 :            : #endif
      92                 :            : 
      93                 :            : #endif

Generated by: LCOV version 1.14