23 */
24
25 #ifndef SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
26 #define SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "runtime/orderAccess.hpp"
30 #include "runtime/thread.inline.hpp"
31 #include "utilities/globalCounter.hpp"
32
33 inline GlobalCounter::CSContext
34 GlobalCounter::critical_section_begin(Thread *thread) {
35 assert(thread == Thread::current(), "must be current thread");
36 uintx old_cnt = Atomic::load(thread->get_rcu_counter());
37 // Retain the old counter value if already active, e.g. nested.
38 // Otherwise, set the counter to the current version + active bit.
39 uintx new_cnt = old_cnt;
40 if ((new_cnt & COUNTER_ACTIVE) == 0) {
41 new_cnt = Atomic::load(&_global_counter._counter) | COUNTER_ACTIVE;
42 }
43 OrderAccess::release_store_fence(thread->get_rcu_counter(), new_cnt);
44 return static_cast<CSContext>(old_cnt);
45 }
46
47 inline void
48 GlobalCounter::critical_section_end(Thread *thread, CSContext context) {
49 assert(thread == Thread::current(), "must be current thread");
50 assert((*thread->get_rcu_counter() & COUNTER_ACTIVE) == COUNTER_ACTIVE, "must be in critical section");
51 // Restore the counter value from before the associated begin.
52 OrderAccess::release_store(thread->get_rcu_counter(),
53 static_cast<uintx>(context));
54 }
55
56 class GlobalCounter::CriticalSection {
57 private:
58 Thread* _thread;
59 CSContext _context;
60 public:
61 inline CriticalSection(Thread* thread) :
62 _thread(thread),
63 _context(GlobalCounter::critical_section_begin(_thread))
64 {}
65
66 inline ~CriticalSection() {
67 GlobalCounter::critical_section_end(_thread, _context);
68 }
69 };
70
71 #endif // SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
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23 */
24
25 #ifndef SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
26 #define SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "runtime/orderAccess.hpp"
30 #include "runtime/thread.inline.hpp"
31 #include "utilities/globalCounter.hpp"
32
33 inline GlobalCounter::CSContext
34 GlobalCounter::critical_section_begin(Thread *thread) {
35 assert(thread == Thread::current(), "must be current thread");
36 uintx old_cnt = Atomic::load(thread->get_rcu_counter());
37 // Retain the old counter value if already active, e.g. nested.
38 // Otherwise, set the counter to the current version + active bit.
39 uintx new_cnt = old_cnt;
40 if ((new_cnt & COUNTER_ACTIVE) == 0) {
41 new_cnt = Atomic::load(&_global_counter._counter) | COUNTER_ACTIVE;
42 }
43 Atomic::release_store_fence(thread->get_rcu_counter(), new_cnt);
44 return static_cast<CSContext>(old_cnt);
45 }
46
47 inline void
48 GlobalCounter::critical_section_end(Thread *thread, CSContext context) {
49 assert(thread == Thread::current(), "must be current thread");
50 assert((*thread->get_rcu_counter() & COUNTER_ACTIVE) == COUNTER_ACTIVE, "must be in critical section");
51 // Restore the counter value from before the associated begin.
52 Atomic::release_store(thread->get_rcu_counter(),
53 static_cast<uintx>(context));
54 }
55
56 class GlobalCounter::CriticalSection {
57 private:
58 Thread* _thread;
59 CSContext _context;
60 public:
61 inline CriticalSection(Thread* thread) :
62 _thread(thread),
63 _context(GlobalCounter::critical_section_begin(_thread))
64 {}
65
66 inline ~CriticalSection() {
67 GlobalCounter::critical_section_end(_thread, _context);
68 }
69 };
70
71 #endif // SHARE_UTILITIES_GLOBALCOUNTER_INLINE_HPP
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