27 |
27 |
28 #include "memory/allocation.hpp" |
28 #include "memory/allocation.hpp" |
29 |
29 |
30 class Atomic : AllStatic { |
30 class Atomic : AllStatic { |
31 public: |
31 public: |
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32 // Atomic operations on jlong types are not available on all 32-bit |
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33 // platforms. If atomic ops on jlongs are defined here they must only |
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34 // be used from code that verifies they are available at runtime and |
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35 // can provide an alternative action if not - see supports_cx8() for |
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36 // a means to test availability. |
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37 |
32 // Atomically store to a location |
38 // Atomically store to a location |
33 inline static void store (jbyte store_value, jbyte* dest); |
39 inline static void store (jbyte store_value, jbyte* dest); |
34 inline static void store (jshort store_value, jshort* dest); |
40 inline static void store (jshort store_value, jshort* dest); |
35 inline static void store (jint store_value, jint* dest); |
41 inline static void store (jint store_value, jint* dest); |
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42 // See comment above about using jlong atomics on 32-bit platforms |
36 inline static void store (jlong store_value, jlong* dest); |
43 inline static void store (jlong store_value, jlong* dest); |
37 inline static void store_ptr(intptr_t store_value, intptr_t* dest); |
44 inline static void store_ptr(intptr_t store_value, intptr_t* dest); |
38 inline static void store_ptr(void* store_value, void* dest); |
45 inline static void store_ptr(void* store_value, void* dest); |
39 |
46 |
40 inline static void store (jbyte store_value, volatile jbyte* dest); |
47 inline static void store (jbyte store_value, volatile jbyte* dest); |
41 inline static void store (jshort store_value, volatile jshort* dest); |
48 inline static void store (jshort store_value, volatile jshort* dest); |
42 inline static void store (jint store_value, volatile jint* dest); |
49 inline static void store (jint store_value, volatile jint* dest); |
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50 // See comment above about using jlong atomics on 32-bit platforms |
43 inline static void store (jlong store_value, volatile jlong* dest); |
51 inline static void store (jlong store_value, volatile jlong* dest); |
44 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest); |
52 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest); |
45 inline static void store_ptr(void* store_value, volatile void* dest); |
53 inline static void store_ptr(void* store_value, volatile void* dest); |
46 |
54 |
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55 // See comment above about using jlong atomics on 32-bit platforms |
47 inline static jlong load(volatile jlong* src); |
56 inline static jlong load(volatile jlong* src); |
48 |
57 |
49 // Atomically add to a location, return updated value |
58 // Atomically add to a location, return updated value |
50 inline static jint add (jint add_value, volatile jint* dest); |
59 inline static jint add (jint add_value, volatile jint* dest); |
51 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); |
60 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); |
52 inline static void* add_ptr(intptr_t add_value, volatile void* dest); |
61 inline static void* add_ptr(intptr_t add_value, volatile void* dest); |
53 |
62 // See comment above about using jlong atomics on 32-bit platforms |
54 static jlong add (jlong add_value, volatile jlong* dest); |
63 static jlong add (jlong add_value, volatile jlong* dest); |
55 |
64 |
56 // Atomically increment location |
65 // Atomically increment location |
57 inline static void inc (volatile jint* dest); |
66 inline static void inc (volatile jint* dest); |
58 inline static void inc_ptr(volatile intptr_t* dest); |
67 inline static void inc_ptr(volatile intptr_t* dest); |
73 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value |
82 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value |
74 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory |
83 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory |
75 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. |
84 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. |
76 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value); |
85 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value); |
77 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value); |
86 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value); |
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87 // See comment above about using jlong atomics on 32-bit platforms |
78 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value); |
88 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value); |
79 |
89 |
80 static unsigned int cmpxchg(unsigned int exchange_value, |
90 static unsigned int cmpxchg(unsigned int exchange_value, |
81 volatile unsigned int* dest, |
91 volatile unsigned int* dest, |
82 unsigned int compare_value); |
92 unsigned int compare_value); |