47 inline static void store (jbyte store_value, volatile jbyte* dest); 48 inline static void store (jshort store_value, volatile jshort* dest); 49 inline static void store (jint store_value, volatile jint* dest); 50 // See comment above about using jlong atomics on 32-bit platforms 51 inline static void store (jlong store_value, volatile jlong* dest); 52 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest); 53 inline static void store_ptr(void* store_value, volatile void* dest); 54 55 // See comment above about using jlong atomics on 32-bit platforms 56 inline static jlong load(volatile jlong* src); 57 58 // Atomically add to a location, return updated value 59 inline static jint add (jint add_value, volatile jint* dest); 60 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); 61 inline static void* add_ptr(intptr_t add_value, volatile void* dest); 62 // See comment above about using jlong atomics on 32-bit platforms 63 static jlong add (jlong add_value, volatile jlong* dest); 64 65 // Atomically increment location 66 inline static void inc (volatile jint* dest); 67 inline static void inc_ptr(volatile intptr_t* dest); 68 inline static void inc_ptr(volatile void* dest); 69 70 // Atomically decrement a location 71 inline static void dec (volatile jint* dest); 72 inline static void dec_ptr(volatile intptr_t* dest); 73 inline static void dec_ptr(volatile void* dest); 74 75 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest. 76 inline static jint xchg(jint exchange_value, volatile jint* dest); 77 static unsigned int xchg(unsigned int exchange_value, volatile unsigned int* dest); 78 79 inline static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest); 80 inline static void* xchg_ptr(void* exchange_value, volatile void* dest); 81 82 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value 83 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory 84 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. 85 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value); 86 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value); 87 // See comment above about using jlong atomics on 32-bit platforms 88 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value); 89 90 static unsigned int cmpxchg(unsigned int exchange_value, 91 volatile unsigned int* dest, 92 unsigned int compare_value); 93 94 inline static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value); 95 inline static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value); 96 }; 97 98 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP | 47 inline static void store (jbyte store_value, volatile jbyte* dest); 48 inline static void store (jshort store_value, volatile jshort* dest); 49 inline static void store (jint store_value, volatile jint* dest); 50 // See comment above about using jlong atomics on 32-bit platforms 51 inline static void store (jlong store_value, volatile jlong* dest); 52 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest); 53 inline static void store_ptr(void* store_value, volatile void* dest); 54 55 // See comment above about using jlong atomics on 32-bit platforms 56 inline static jlong load(volatile jlong* src); 57 58 // Atomically add to a location, return updated value 59 inline static jint add (jint add_value, volatile jint* dest); 60 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest); 61 inline static void* add_ptr(intptr_t add_value, volatile void* dest); 62 // See comment above about using jlong atomics on 32-bit platforms 63 static jlong add (jlong add_value, volatile jlong* dest); 64 65 // Atomically increment location 66 inline static void inc (volatile jint* dest); 67 static void inc (volatile jshort* dest); 68 inline static void inc_ptr(volatile intptr_t* dest); 69 inline static void inc_ptr(volatile void* dest); 70 71 // Atomically decrement a location 72 inline static void dec (volatile jint* dest); 73 static void dec (volatile jshort* dest); 74 inline static void dec_ptr(volatile intptr_t* dest); 75 inline static void dec_ptr(volatile void* dest); 76 77 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest. 78 inline static jint xchg(jint exchange_value, volatile jint* dest); 79 static unsigned int xchg(unsigned int exchange_value, volatile unsigned int* dest); 80 81 inline static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest); 82 inline static void* xchg_ptr(void* exchange_value, volatile void* dest); 83 84 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value 85 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory 86 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'. 87 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value); 88 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value); 89 // See comment above about using jlong atomics on 32-bit platforms 90 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value); 91 92 static unsigned int cmpxchg(unsigned int exchange_value, 93 volatile unsigned int* dest, 94 unsigned int compare_value); 95 96 inline static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value); 97 inline static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value); 98 }; 99 100 // To use Atomic::inc(jshort* dest) and Atomic::dec(jshort* dest), the address must be specially 101 // aligned, such that (*dest) occupies the upper 16 bits of an aligned 32-bit word. The best way to 102 // achieve is to place your short value next to another short value, which doesn't need atomic ops. 103 // 104 // Example 105 // ATOMIC_SHORT_PAIR( 106 // volatile short _refcount, // needs atomic operation 107 // unsigned short _length // number of UTF8 characters in the symbol (does not need atomic op) 108 // ); 109 110 #ifdef VM_LITTLE_ENDIAN 111 #define ATOMIC_SHORT_PAIR(atomic_decl, non_atomic_decl) \ 112 non_atomic_decl; \ 113 atomic_decl 114 #else 115 #define ATOMIC_SHORT_PAIR(atomic_decl, non_atomic_decl) \ 116 atomic_decl ; \ 117 non_atomic_decl 118 #endif 119 120 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP |