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src/os_cpu/linux_zero/vm/atomic_linux_zero.hpp
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rev 13449 : imported patch linux_zero
rev 13452 : [mq]: coleen_review1
rev 13458 : imported patch cmpxchg_using_helper
@@ -55,13 +55,13 @@
}
/* Perform an atomic compare and swap: if the current value of `*PTR'
is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of
`*PTR' before the operation.*/
-static inline int m68k_compare_and_swap(volatile int *ptr,
- int oldval,
- int newval) {
+static inline int m68k_compare_and_swap(int newval,
+ volatile int *ptr,
+ int oldval) {
for (;;) {
int prev = *ptr;
if (prev != oldval)
return prev;
@@ -116,13 +116,13 @@
/* Perform an atomic compare and swap: if the current value of `*PTR'
is OLDVAL, then write NEWVAL into `*PTR'. Return the contents of
`*PTR' before the operation.*/
-static inline int arm_compare_and_swap(volatile int *ptr,
- int oldval,
- int newval) {
+static inline int arm_compare_and_swap(int newval,
+ volatile int *ptr,
+ int oldval) {
for (;;) {
int prev = *ptr;
if (prev != oldval)
return prev;
@@ -259,59 +259,42 @@
inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
return (void *) xchg_ptr((intptr_t) exchange_value,
(volatile intptr_t*) dest);
}
-inline jint Atomic::cmpxchg(jint exchange_value,
- volatile jint* dest,
- jint compare_value,
+// No direct support for cmpxchg of bytes; emulate using int.
+template<>
+struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};
+
+template<>
+template<typename T>
+inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
+ T volatile* dest,
+ T compare_value,
cmpxchg_memory_order order) {
+ STATIC_ASSERT(4 == sizeof(T));
#ifdef ARM
- return arm_compare_and_swap(dest, compare_value, exchange_value);
+ return cmpxchg_using_helper<int>(arm_compare_and_swap, exchange_value, dest, compare_value);
#else
#ifdef M68K
- return m68k_compare_and_swap(dest, compare_value, exchange_value);
+ return cmpxchg_using_helper<int>(m68k_compare_and_swap, exchange_value, dest, compare_value);
#else
return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
#endif // M68K
#endif // ARM
}
-inline jlong Atomic::cmpxchg(jlong exchange_value,
- volatile jlong* dest,
- jlong compare_value,
+template<>
+template<typename T>
+inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
+ T volatile* dest,
+ T compare_value,
cmpxchg_memory_order order) {
-
+ STATIC_ASSERT(8 == sizeof(T));
return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
}
-inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value,
- volatile intptr_t* dest,
- intptr_t compare_value,
- cmpxchg_memory_order order) {
-#ifdef ARM
- return arm_compare_and_swap(dest, compare_value, exchange_value);
-#else
-#ifdef M68K
- return m68k_compare_and_swap(dest, compare_value, exchange_value);
-#else
- return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
-#endif // M68K
-#endif // ARM
-}
-
-inline void* Atomic::cmpxchg_ptr(void* exchange_value,
- volatile void* dest,
- void* compare_value,
- cmpxchg_memory_order order) {
-
- return (void *) cmpxchg_ptr((intptr_t) exchange_value,
- (volatile intptr_t*) dest,
- (intptr_t) compare_value,
- order);
-}
-
inline jlong Atomic::load(const volatile jlong* src) {
volatile jlong dest;
os::atomic_copy64(src, &dest);
return dest;
}
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