Thanks to Moore, Branden <Branden.Moore@amd.com> for identifying the
race condition and suggesting the changes to fix the same
Existing Design:
- AOCL progress callback pointer is a global pointer which is shared
across all threads
Existing Design challenges:
- The callback function cannot safely disable the progress mechanism,
as another thread may have already checked to see if the function
pointer is set, and then re-reads the pointer upon invocation of
the callback. If one thread sets the callback to NULL in this time,
then the resulting thread will attempt to call the null pointer as a
function pointer, leading to a segfault.
New Design :
- Each thread maintains a local copy of progress pointer
AMD-Internal: [SWLCSG-1971]
Change-Id: I282989805a4a2a8a759a7373b645f3569bf42ed4
- BLIS uses callback function to report the progress of the
operation. The callback is implemented in the user application
and is invoked by BLIS.
- Updated callback function prototype to make all arguments const.
This will ensure that any attempt to write using callback’s
argument is prevented at the compile time itself.
AMD-Internal: [CPUPL-2504]
Change-Id: I8ceb671242365d2a9155b485301cd8c75043e667
-- AOCL libraries are used for lengthy computations which can go
on for hours or days, once the operation is started, the user
doesn’t get any update on current state of the computation.
This (AOCL progress) feature enables user to receive a periodic
update from the libraries.
-- User registers a callback with the library if it is interested
in receiving the periodic update.
-- The library invokes this callback periodically with information
about current state of the operation.
-- The update frequency is statically set in the code, it can be
modified as needed if the library is built from source.
-- These feature is supported for GEMM and TRSM operations.
-- Added example for GEMM and TRSM.
-- Cleaned up and reformatted test_gemm.c and test_trsm.c to
remove warnings and making indentation consistent across the
file.
AMD-Internal: [CPUPL-2082]
Change-Id: I2aacdd8fb76f52e19e3850ee0295df49a8b7a90e
