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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [include/] [asm-ia64/] [semaphore.h] - Blame information for rev 1780

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#ifndef _ASM_IA64_SEMAPHORE_H
#define _ASM_IA64_SEMAPHORE_H
 
/*
 * Copyright (C) 1998-2000 Hewlett-Packard Co
 * Copyright (C) 1998-2000 David Mosberger-Tang <davidm@hpl.hp.com>
 */
 
#include <linux/wait.h>
#include <linux/rwsem.h>
 
#include <asm/atomic.h>
 
struct semaphore {
        atomic_t count;
        int sleepers;
        wait_queue_head_t wait;
#if WAITQUEUE_DEBUG
        long __magic;           /* initialized by __SEM_DEBUG_INIT() */
#endif
};
 
#if WAITQUEUE_DEBUG
# define __SEM_DEBUG_INIT(name)         , (long) &(name).__magic
#else
# define __SEM_DEBUG_INIT(name)
#endif
 
#define __SEMAPHORE_INITIALIZER(name,count)                                     \
{                                                                               \
        ATOMIC_INIT(count), 0, __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)        \
        __SEM_DEBUG_INIT(name)                                                  \
}
 
#define __MUTEX_INITIALIZER(name)       __SEMAPHORE_INITIALIZER(name,1)
 
#define __DECLARE_SEMAPHORE_GENERIC(name,count)                                 \
        struct semaphore name = __SEMAPHORE_INITIALIZER(name, count)
 
#define DECLARE_MUTEX(name)             __DECLARE_SEMAPHORE_GENERIC(name, 1)
#define DECLARE_MUTEX_LOCKED(name)      __DECLARE_SEMAPHORE_GENERIC(name, 0)
 
static inline void
sema_init (struct semaphore *sem, int val)
{
        *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val);
}
 
static inline void
init_MUTEX (struct semaphore *sem)
{
        sema_init(sem, 1);
}
 
static inline void
init_MUTEX_LOCKED (struct semaphore *sem)
{
        sema_init(sem, 0);
}
 
extern void __down (struct semaphore * sem);
extern int  __down_interruptible (struct semaphore * sem);
extern int  __down_trylock (struct semaphore * sem);
extern void __up (struct semaphore * sem);
 
/*
 * Atomically decrement the semaphore's count.  If it goes negative,
 * block the calling thread in the TASK_UNINTERRUPTIBLE state.
 */
static inline void
down (struct semaphore *sem)
{
#if WAITQUEUE_DEBUG
        CHECK_MAGIC(sem->__magic);
#endif
        if (atomic_dec_return(&sem->count) < 0)
                __down(sem);
}
 
/*
 * Atomically decrement the semaphore's count.  If it goes negative,
 * block the calling thread in the TASK_INTERRUPTIBLE state.
 */
static inline int
down_interruptible (struct semaphore * sem)
{
        int ret = 0;
 
#if WAITQUEUE_DEBUG
        CHECK_MAGIC(sem->__magic);
#endif
        if (atomic_dec_return(&sem->count) < 0)
                ret = __down_interruptible(sem);
        return ret;
}
 
static inline int
down_trylock (struct semaphore *sem)
{
        int ret = 0;
 
#if WAITQUEUE_DEBUG
        CHECK_MAGIC(sem->__magic);
#endif
        if (atomic_dec_return(&sem->count) < 0)
                ret = __down_trylock(sem);
        return ret;
}
 
static inline void
up (struct semaphore * sem)
{
#if WAITQUEUE_DEBUG
        CHECK_MAGIC(sem->__magic);
#endif
        if (atomic_inc_return(&sem->count) <= 0)
                __up(sem);
}
 
static inline int sem_getcount(struct semaphore *sem)
{
        return atomic_read(&sem->count);
}
 
#endif /* _ASM_IA64_SEMAPHORE_H */

Line No.	Rev	Author	Line
1	1275	phoenix	`#ifndef _ASM_IA64_SEMAPHORE_H`
2			`#define _ASM_IA64_SEMAPHORE_H`
3
4			`/*`
5			`* Copyright (C) 1998-2000 Hewlett-Packard Co`
6			`* Copyright (C) 1998-2000 David Mosberger-Tang <davidm@hpl.hp.com>`
7			`*/`
8
9			`#include <linux/wait.h>`
10			`#include <linux/rwsem.h>`
11
12			`#include <asm/atomic.h>`
13
14			`struct semaphore {`
15			`atomic_t count;`
16			`int sleepers;`
17			`wait_queue_head_t wait;`
18			`#if WAITQUEUE_DEBUG`
19			`long __magic; /* initialized by __SEM_DEBUG_INIT() */`
20			`#endif`
21			`};`
22
23			`#if WAITQUEUE_DEBUG`
24			`# define __SEM_DEBUG_INIT(name) , (long) &(name).__magic`
25			`#else`
26			`# define __SEM_DEBUG_INIT(name)`
27			`#endif`
28
29			`#define __SEMAPHORE_INITIALIZER(name,count) \`
30			`{ \`
31			`ATOMIC_INIT(count), 0, __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \`
32			`__SEM_DEBUG_INIT(name) \`
33			`}`
34
35			`#define __MUTEX_INITIALIZER(name) __SEMAPHORE_INITIALIZER(name,1)`
36
37			`#define __DECLARE_SEMAPHORE_GENERIC(name,count) \`
38			`struct semaphore name = __SEMAPHORE_INITIALIZER(name, count)`
39
40			`#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name, 1)`
41			`#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name, 0)`
42
43			`static inline void`
44			`sema_init (struct semaphore *sem, int val)`
45			`{`
46			`sem = (struct semaphore) __SEMAPHORE_INITIALIZER(sem, val);`
47			`}`
48
49			`static inline void`
50			`init_MUTEX (struct semaphore *sem)`
51			`{`
52			`sema_init(sem, 1);`
53			`}`
54
55			`static inline void`
56			`init_MUTEX_LOCKED (struct semaphore *sem)`
57			`{`
58			`sema_init(sem, 0);`
59			`}`
60
61			`extern void __down (struct semaphore * sem);`
62			`extern int __down_interruptible (struct semaphore * sem);`
63			`extern int __down_trylock (struct semaphore * sem);`
64			`extern void __up (struct semaphore * sem);`
65
66			`/*`
67			`* Atomically decrement the semaphore's count. If it goes negative,`
68			`* block the calling thread in the TASK_UNINTERRUPTIBLE state.`
69			`*/`
70			`static inline void`
71			`down (struct semaphore *sem)`
72			`{`
73			`#if WAITQUEUE_DEBUG`
74			`CHECK_MAGIC(sem->__magic);`
75			`#endif`
76			`if (atomic_dec_return(&sem->count) < 0)`
77			`__down(sem);`
78			`}`
79
80			`/*`
81			`* Atomically decrement the semaphore's count. If it goes negative,`
82			`* block the calling thread in the TASK_INTERRUPTIBLE state.`
83			`*/`
84			`static inline int`
85			`down_interruptible (struct semaphore * sem)`
86			`{`
87			`int ret = 0;`
88
89			`#if WAITQUEUE_DEBUG`
90			`CHECK_MAGIC(sem->__magic);`
91			`#endif`
92			`if (atomic_dec_return(&sem->count) < 0)`
93			`ret = __down_interruptible(sem);`
94			`return ret;`
95			`}`
96
97			`static inline int`
98			`down_trylock (struct semaphore *sem)`
99			`{`
100			`int ret = 0;`
101
102			`#if WAITQUEUE_DEBUG`
103			`CHECK_MAGIC(sem->__magic);`
104			`#endif`
105			`if (atomic_dec_return(&sem->count) < 0)`
106			`ret = __down_trylock(sem);`
107			`return ret;`
108			`}`
109
110			`static inline void`
111			`up (struct semaphore * sem)`
112			`{`
113			`#if WAITQUEUE_DEBUG`
114			`CHECK_MAGIC(sem->__magic);`
115			`#endif`
116			`if (atomic_inc_return(&sem->count) <= 0)`
117			`__up(sem);`
118			`}`
119
120			`static inline int sem_getcount(struct semaphore *sem)`
121			`{`
122			`return atomic_read(&sem->count);`
123			`}`
124
125			`#endif /* _ASM_IA64_SEMAPHORE_H */`

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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [include/] [asm-ia64/] [semaphore.h] - Blame information for rev 1780