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Line 29... | Line 29... | ||
29 | #include <arch.h> |
29 | #include <arch.h> |
30 | 30 | ||
31 | #include <arch/atomic.h> |
31 | #include <arch/atomic.h> |
32 | #include <arch/barrier.h> |
32 | #include <arch/barrier.h> |
33 | #include <synch/spinlock.h> |
33 | #include <synch/spinlock.h> |
- | 34 | #include <preemption.h> |
|
34 | #include <print.h> |
35 | #include <print.h> |
35 | 36 | ||
36 | #ifdef __SMP__ |
37 | #ifdef __SMP__ |
37 | 38 | ||
38 | void spinlock_initialize(spinlock_t *sl) |
39 | void spinlock_initialize(spinlock_t *sl) |
Line 44... | Line 45... | ||
44 | void spinlock_lock(spinlock_t *sl) |
45 | void spinlock_lock(spinlock_t *sl) |
45 | { |
46 | { |
46 | int i = 0; |
47 | int i = 0; |
47 | __address caller = ((__u32 *) &sl)[-1]; |
48 | __address caller = ((__u32 *) &sl)[-1]; |
48 | 49 | ||
- | 50 | preemption_disable(); |
|
49 | while (test_and_set(&sl->val)) { |
51 | while (test_and_set(&sl->val)) { |
50 | if (i++ > 300000) { |
52 | if (i++ > 300000) { |
51 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
53 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
52 | i = 0; |
54 | i = 0; |
53 | } |
55 | } |
Line 56... | Line 58... | ||
56 | 58 | ||
57 | } |
59 | } |
58 | #else |
60 | #else |
59 | void spinlock_lock(spinlock_t *sl) |
61 | void spinlock_lock(spinlock_t *sl) |
60 | { |
62 | { |
- | 63 | preemption_disable(); |
|
- | 64 | ||
61 | /* |
65 | /* |
62 | * Each architecture has its own efficient/recommended |
66 | * Each architecture has its own efficient/recommended |
63 | * implementation of spinlock. |
67 | * implementation of spinlock. |
64 | */ |
68 | */ |
65 | spinlock_arch(&sl->val); |
69 | spinlock_arch(&sl->val); |
Line 69... | Line 73... | ||
69 | 73 | ||
70 | int spinlock_trylock(spinlock_t *sl) |
74 | int spinlock_trylock(spinlock_t *sl) |
71 | { |
75 | { |
72 | int rc; |
76 | int rc; |
73 | 77 | ||
- | 78 | preemption_disable(); |
|
74 | rc = !test_and_set(&sl->val); |
79 | rc = !test_and_set(&sl->val); |
75 | CS_ENTER_BARRIER(); |
80 | CS_ENTER_BARRIER(); |
- | 81 | ||
- | 82 | if (!rc) |
|
- | 83 | preemption_enable(); |
|
76 | 84 | ||
77 | return rc; |
85 | return rc; |
78 | } |
86 | } |
79 | 87 | ||
80 | void spinlock_unlock(spinlock_t *sl) |
88 | void spinlock_unlock(spinlock_t *sl) |
81 | { |
89 | { |
82 | CS_LEAVE_BARRIER(); |
90 | CS_LEAVE_BARRIER(); |
83 | sl->val = 0; |
91 | sl->val = 0; |
- | 92 | preemption_enable(); |
|
84 | } |
93 | } |
85 | 94 | ||
86 | #endif |
95 | #endif |