Question

i’ve downloaded “openjdk-6-src-b23-05_jul_2011” to have a look at the native implementations for the methods in sun.misc.Unsafe. e.g. compareAndSwapInt(…) but i am not able find anything in the downloaded sources of openjdk. i want to get an idea how these methods look like (i was interested in the atomic stuff the jdk provides).

could anybody point me to the right location(s)?

$ ls jdk/src/
linux  share  solaris  windows

$ ls hotspot/src/os/
linux  posix  solaris  windows

any help appreciated

marcel

Answer 1

Implementation of unsafe methods itself is not OS-specific, therefore it can be found in hotspot/src/share/vm/prims/unsafe.cpp. It delegates to hotspot/src/share/vm/runtime/atomic.cpp, which includes OS and CPU specific files, such as hotspot/src/os_cpu/windows_x86/atomic_windows_x86.inline.hpp.