C11 atomics are not statically guaranteed to be lock free and so
may not be atomic with respect to atomic operations originating
outside the standard library, such as platform atomics.
C11 macros to statically discover always lock free operations
(ATOMIC_*_LOCK_FREE) do not cover uint64_t in GCC and
std::atomic<uint64_t> is not a type alias of any covered type.
All use of __atomic by atomic_helpers.h is statically checked to be
always lock free.
GCC builtin fencing does not appear to be strong enough for WC memory.
Added an option (enabled) to enforce consistency for WC memory on x64.
__sync builtin's were not used as they were declared legacy by GCC.
Added a strongly conservative option (ALWAYS_CONSERVATIVE) to enable
use of full memory fences in place of partial fences and compiler
driven processor specific optimization.
Change-Id: Id7aaaca626144070f58759f6a348cbee4612bbc0
[ROCm/ROCR-Runtime commit: 1bc15bbf79]
This option was disabled by default to address issues writing to stderr
in Windows applications. The lack of an error message for memory access
faults is confusing to users, however.
Enable the error message by default on Linux only.
Change-Id: I1f44ba42362f8874abdc7c8e63ddd54a855b5394
[ROCm/ROCR-Runtime commit: acc5f15e4c]
Ramesh Errabolu
Jay Cornwall
Sean Keely
Besar Wicaksono (xN/A) TX [TEXT]
James Edwards (xN/A) TX