1.1 --- a/src/share/vm/utilities/accessFlags.cpp Mon Nov 03 12:02:40 2014 -0800
1.2 +++ b/src/share/vm/utilities/accessFlags.cpp Thu Oct 02 10:55:36 2014 +0200
1.3 @@ -62,6 +62,21 @@
1.4 } while(f != old_flags);
1.5 }
1.6
1.7 +// Returns true iff this thread succeeded setting the bit.
1.8 +bool AccessFlags::atomic_set_one_bit(jint bit) {
1.9 + // Atomically update the flags with the bit given
1.10 + jint old_flags, new_flags, f;
1.11 + bool is_setting_bit = false;
1.12 + do {
1.13 + old_flags = _flags;
1.14 + new_flags = old_flags | bit;
1.15 + is_setting_bit = old_flags != new_flags;
1.16 + f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
1.17 + } while(f != old_flags);
1.18 +
1.19 + return is_setting_bit;
1.20 +}
1.21 +
1.22 #if !defined(PRODUCT) || INCLUDE_JVMTI
1.23
1.24 void AccessFlags::print_on(outputStream* st) const {
