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1 | #ifndef _LINUX_SEM_H |
2 | #define _LINUX_SEM_H |
3 | |
4 | #include <linux/ipc.h> |
5 | |
6 | /* semop flags */ |
7 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ |
8 | |
9 | /* semctl Command Definitions. */ |
10 | #define GETPID 11 /* get sempid */ |
11 | #define GETVAL 12 /* get semval */ |
12 | #define GETALL 13 /* get all semval's */ |
13 | #define GETNCNT 14 /* get semncnt */ |
14 | #define GETZCNT 15 /* get semzcnt */ |
15 | #define SETVAL 16 /* set semval */ |
16 | #define SETALL 17 /* set all semval's */ |
17 | |
18 | /* ipcs ctl cmds */ |
19 | #define SEM_STAT 18 |
20 | #define SEM_INFO 19 |
21 | |
22 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
23 | struct semid_ds { |
24 | struct ipc_perm sem_perm; /* permissions .. see ipc.h */ |
25 | __kernel_time_t sem_otime; /* last semop time */ |
26 | __kernel_time_t sem_ctime; /* last change time */ |
27 | struct sem *sem_base; /* ptr to first semaphore in array */ |
28 | struct sem_queue *sem_pending; /* pending operations to be processed */ |
29 | struct sem_queue **sem_pending_last; /* last pending operation */ |
30 | struct sem_undo *undo; /* undo requests on this array */ |
31 | unsigned short sem_nsems; /* no. of semaphores in array */ |
32 | }; |
33 | |
34 | /* Include the definition of semid64_ds */ |
35 | #include <asm/sembuf.h> |
36 | |
37 | /* semop system calls takes an array of these. */ |
38 | struct sembuf { |
39 | unsigned short sem_num; /* semaphore index in array */ |
40 | short sem_op; /* semaphore operation */ |
41 | short sem_flg; /* operation flags */ |
42 | }; |
43 | |
44 | /* arg for semctl system calls. */ |
45 | union semun { |
46 | int val; /* value for SETVAL */ |
47 | struct semid_ds __user *buf; /* buffer for IPC_STAT & IPC_SET */ |
48 | unsigned short __user *array; /* array for GETALL & SETALL */ |
49 | struct seminfo __user *__buf; /* buffer for IPC_INFO */ |
50 | void __user *__pad; |
51 | }; |
52 | |
53 | struct seminfo { |
54 | int semmap; |
55 | int semmni; |
56 | int semmns; |
57 | int semmnu; |
58 | int semmsl; |
59 | int semopm; |
60 | int semume; |
61 | int semusz; |
62 | int semvmx; |
63 | int semaem; |
64 | }; |
65 | |
66 | #define SEMMNI 128 /* <= IPCMNI max # of semaphore identifiers */ |
67 | #define SEMMSL 250 /* <= 8 000 max num of semaphores per id */ |
68 | #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
69 | #define SEMOPM 32 /* <= 1 000 max num of ops per semop call */ |
70 | #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ |
71 | #define SEMAEM SEMVMX /* adjust on exit max value */ |
72 | |
73 | /* unused */ |
74 | #define SEMUME SEMOPM /* max num of undo entries per process */ |
75 | #define SEMMNU SEMMNS /* num of undo structures system wide */ |
76 | #define SEMMAP SEMMNS /* # of entries in semaphore map */ |
77 | #define SEMUSZ 20 /* sizeof struct sem_undo */ |
78 | |
79 | #ifdef __KERNEL__ |
80 | #include <asm/atomic.h> |
81 | #include <linux/rcupdate.h> |
82 | #include <linux/cache.h> |
83 | |
84 | struct task_struct; |
85 | |
86 | /* One semaphore structure for each semaphore in the system. */ |
87 | struct sem { |
88 | int semval; /* current value */ |
89 | int sempid; /* pid of last operation */ |
90 | struct list_head sem_pending; /* pending single-sop operations */ |
91 | }; |
92 | |
93 | /* One sem_array data structure for each set of semaphores in the system. */ |
94 | struct sem_array { |
95 | struct kern_ipc_perm ____cacheline_aligned_in_smp |
96 | sem_perm; /* permissions .. see ipc.h */ |
97 | time_t sem_otime; /* last semop time */ |
98 | time_t sem_ctime; /* last change time */ |
99 | struct sem *sem_base; /* ptr to first semaphore in array */ |
100 | struct list_head sem_pending; /* pending operations to be processed */ |
101 | struct list_head list_id; /* undo requests on this array */ |
102 | int sem_nsems; /* no. of semaphores in array */ |
103 | int complex_count; /* pending complex operations */ |
104 | }; |
105 | |
106 | /* One queue for each sleeping process in the system. */ |
107 | struct sem_queue { |
108 | struct list_head simple_list; /* queue of pending operations */ |
109 | struct list_head list; /* queue of pending operations */ |
110 | struct task_struct *sleeper; /* this process */ |
111 | struct sem_undo *undo; /* undo structure */ |
112 | int pid; /* process id of requesting process */ |
113 | int status; /* completion status of operation */ |
114 | struct sembuf *sops; /* array of pending operations */ |
115 | int nsops; /* number of operations */ |
116 | int alter; /* does the operation alter the array? */ |
117 | }; |
118 | |
119 | /* Each task has a list of undo requests. They are executed automatically |
120 | * when the process exits. |
121 | */ |
122 | struct sem_undo { |
123 | struct list_head list_proc; /* per-process list: all undos from one process. */ |
124 | /* rcu protected */ |
125 | struct rcu_head rcu; /* rcu struct for sem_undo() */ |
126 | struct sem_undo_list *ulp; /* sem_undo_list for the process */ |
127 | struct list_head list_id; /* per semaphore array list: all undos for one array */ |
128 | int semid; /* semaphore set identifier */ |
129 | short * semadj; /* array of adjustments, one per semaphore */ |
130 | }; |
131 | |
132 | /* sem_undo_list controls shared access to the list of sem_undo structures |
133 | * that may be shared among all a CLONE_SYSVSEM task group. |
134 | */ |
135 | struct sem_undo_list { |
136 | atomic_t refcnt; |
137 | spinlock_t lock; |
138 | struct list_head list_proc; |
139 | }; |
140 | |
141 | struct sysv_sem { |
142 | struct sem_undo_list *undo_list; |
143 | }; |
144 | |
145 | #ifdef CONFIG_SYSVIPC |
146 | |
147 | extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk); |
148 | extern void exit_sem(struct task_struct *tsk); |
149 | |
150 | #else |
151 | static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk) |
152 | { |
153 | return 0; |
154 | } |
155 | |
156 | static inline void exit_sem(struct task_struct *tsk) |
157 | { |
158 | return; |
159 | } |
160 | #endif |
161 | |
162 | #endif /* __KERNEL__ */ |
163 | |
164 | #endif /* _LINUX_SEM_H */ |
165 |
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