spinlock.h (fb3a6bbc912b12347614e5742c7c61416cdb0ca0) spinlock.h (e5931943d02bf751b1ec849c0d2ade23d76a8d41)
1#ifndef __ASM_SPINLOCK_H
2#define __ASM_SPINLOCK_H
3
4#include <asm/system.h>
5#include <asm/processor.h>
6#include <asm/spinlock_types.h>
7
8static inline int arch_spin_is_locked(arch_spinlock_t *x)

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64 * Readers use the lock to serialise their access to the counter (which
65 * records how many readers currently hold the lock).
66 * Writers hold the spinlock, preventing any readers or other writers from
67 * grabbing the rwlock.
68 */
69
70/* Note that we have to ensure interrupts are disabled in case we're
71 * interrupted by some other code that wants to grab the same read lock */
1#ifndef __ASM_SPINLOCK_H
2#define __ASM_SPINLOCK_H
3
4#include <asm/system.h>
5#include <asm/processor.h>
6#include <asm/spinlock_types.h>
7
8static inline int arch_spin_is_locked(arch_spinlock_t *x)

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64 * Readers use the lock to serialise their access to the counter (which
65 * records how many readers currently hold the lock).
66 * Writers hold the spinlock, preventing any readers or other writers from
67 * grabbing the rwlock.
68 */
69
70/* Note that we have to ensure interrupts are disabled in case we're
71 * interrupted by some other code that wants to grab the same read lock */
72static __inline__ void __raw_read_lock(arch_rwlock_t *rw)
72static __inline__ void arch_read_lock(arch_rwlock_t *rw)
73{
74 unsigned long flags;
75 local_irq_save(flags);
76 arch_spin_lock_flags(&rw->lock, flags);
77 rw->counter++;
78 arch_spin_unlock(&rw->lock);
79 local_irq_restore(flags);
80}
81
82/* Note that we have to ensure interrupts are disabled in case we're
83 * interrupted by some other code that wants to grab the same read lock */
73{
74 unsigned long flags;
75 local_irq_save(flags);
76 arch_spin_lock_flags(&rw->lock, flags);
77 rw->counter++;
78 arch_spin_unlock(&rw->lock);
79 local_irq_restore(flags);
80}
81
82/* Note that we have to ensure interrupts are disabled in case we're
83 * interrupted by some other code that wants to grab the same read lock */
84static __inline__ void __raw_read_unlock(arch_rwlock_t *rw)
84static __inline__ void arch_read_unlock(arch_rwlock_t *rw)
85{
86 unsigned long flags;
87 local_irq_save(flags);
88 arch_spin_lock_flags(&rw->lock, flags);
89 rw->counter--;
90 arch_spin_unlock(&rw->lock);
91 local_irq_restore(flags);
92}
93
94/* Note that we have to ensure interrupts are disabled in case we're
95 * interrupted by some other code that wants to grab the same read lock */
85{
86 unsigned long flags;
87 local_irq_save(flags);
88 arch_spin_lock_flags(&rw->lock, flags);
89 rw->counter--;
90 arch_spin_unlock(&rw->lock);
91 local_irq_restore(flags);
92}
93
94/* Note that we have to ensure interrupts are disabled in case we're
95 * interrupted by some other code that wants to grab the same read lock */
96static __inline__ int __raw_read_trylock(arch_rwlock_t *rw)
96static __inline__ int arch_read_trylock(arch_rwlock_t *rw)
97{
98 unsigned long flags;
99 retry:
100 local_irq_save(flags);
101 if (arch_spin_trylock(&rw->lock)) {
102 rw->counter++;
103 arch_spin_unlock(&rw->lock);
104 local_irq_restore(flags);

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114 while (arch_spin_is_locked(&rw->lock) && rw->counter >= 0)
115 cpu_relax();
116
117 goto retry;
118}
119
120/* Note that we have to ensure interrupts are disabled in case we're
121 * interrupted by some other code that wants to read_trylock() this lock */
97{
98 unsigned long flags;
99 retry:
100 local_irq_save(flags);
101 if (arch_spin_trylock(&rw->lock)) {
102 rw->counter++;
103 arch_spin_unlock(&rw->lock);
104 local_irq_restore(flags);

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114 while (arch_spin_is_locked(&rw->lock) && rw->counter >= 0)
115 cpu_relax();
116
117 goto retry;
118}
119
120/* Note that we have to ensure interrupts are disabled in case we're
121 * interrupted by some other code that wants to read_trylock() this lock */
122static __inline__ void __raw_write_lock(arch_rwlock_t *rw)
122static __inline__ void arch_write_lock(arch_rwlock_t *rw)
123{
124 unsigned long flags;
125retry:
126 local_irq_save(flags);
127 arch_spin_lock_flags(&rw->lock, flags);
128
129 if (rw->counter != 0) {
130 arch_spin_unlock(&rw->lock);

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136 goto retry;
137 }
138
139 rw->counter = -1; /* mark as write-locked */
140 mb();
141 local_irq_restore(flags);
142}
143
123{
124 unsigned long flags;
125retry:
126 local_irq_save(flags);
127 arch_spin_lock_flags(&rw->lock, flags);
128
129 if (rw->counter != 0) {
130 arch_spin_unlock(&rw->lock);

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136 goto retry;
137 }
138
139 rw->counter = -1; /* mark as write-locked */
140 mb();
141 local_irq_restore(flags);
142}
143
144static __inline__ void __raw_write_unlock(arch_rwlock_t *rw)
144static __inline__ void arch_write_unlock(arch_rwlock_t *rw)
145{
146 rw->counter = 0;
147 arch_spin_unlock(&rw->lock);
148}
149
150/* Note that we have to ensure interrupts are disabled in case we're
151 * interrupted by some other code that wants to read_trylock() this lock */
145{
146 rw->counter = 0;
147 arch_spin_unlock(&rw->lock);
148}
149
150/* Note that we have to ensure interrupts are disabled in case we're
151 * interrupted by some other code that wants to read_trylock() this lock */
152static __inline__ int __raw_write_trylock(arch_rwlock_t *rw)
152static __inline__ int arch_write_trylock(arch_rwlock_t *rw)
153{
154 unsigned long flags;
155 int result = 0;
156
157 local_irq_save(flags);
158 if (arch_spin_trylock(&rw->lock)) {
159 if (rw->counter == 0) {
160 rw->counter = -1;

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168
169 return result;
170}
171
172/*
173 * read_can_lock - would read_trylock() succeed?
174 * @lock: the rwlock in question.
175 */
153{
154 unsigned long flags;
155 int result = 0;
156
157 local_irq_save(flags);
158 if (arch_spin_trylock(&rw->lock)) {
159 if (rw->counter == 0) {
160 rw->counter = -1;

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168
169 return result;
170}
171
172/*
173 * read_can_lock - would read_trylock() succeed?
174 * @lock: the rwlock in question.
175 */
176static __inline__ int __raw_read_can_lock(arch_rwlock_t *rw)
176static __inline__ int arch_read_can_lock(arch_rwlock_t *rw)
177{
178 return rw->counter >= 0;
179}
180
181/*
182 * write_can_lock - would write_trylock() succeed?
183 * @lock: the rwlock in question.
184 */
177{
178 return rw->counter >= 0;
179}
180
181/*
182 * write_can_lock - would write_trylock() succeed?
183 * @lock: the rwlock in question.
184 */
185static __inline__ int __raw_write_can_lock(arch_rwlock_t *rw)
185static __inline__ int arch_write_can_lock(arch_rwlock_t *rw)
186{
187 return !rw->counter;
188}
189
186{
187 return !rw->counter;
188}
189
190#define __raw_read_lock_flags(lock, flags) __raw_read_lock(lock)
191#define __raw_write_lock_flags(lock, flags) __raw_write_lock(lock)
190#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
191#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
192
193#define arch_spin_relax(lock) cpu_relax()
194#define arch_read_relax(lock) cpu_relax()
195#define arch_write_relax(lock) cpu_relax()
196
197#endif /* __ASM_SPINLOCK_H */
192
193#define arch_spin_relax(lock) cpu_relax()
194#define arch_read_relax(lock) cpu_relax()
195#define arch_write_relax(lock) cpu_relax()
196
197#endif /* __ASM_SPINLOCK_H */