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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can
* be found in the LICENSE file.
*
*/
//
// Fine-grained shared virtual memory ring
//
// There is limited support for C11 atomics in C compilers so
// implement this module in C++11
//
extern "C" {
#include "runtime.h"
#include "ring_cl_svm_fine.h"
}
//
//
//
#include <atomic>
//
//
//
union skc_ring
{
std::atomic<skc_uint> rw[2];
struct {
std::atomic<skc_uint> reads; // number of reads
std::atomic<skc_uint> writes; // number of writes
};
};
//
//
//
union skc_ring *
skc_ring_cl_svm_fine_alloc(struct skc_runtime_impl * const runtime_impl)
{
return (union skc_ring *)
clSVMAlloc(runtime_impl->context,
CL_MEM_READ_WRITE | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS,
sizeof(union skc_ring),
0);
}
void
skc_ring_cl_svm_fine_init(union skc_ring * const ring, skc_uint writes)
{
ring->reads = ATOMIC_VAR_INIT(0);
ring->writes = ATOMIC_VAR_INIT(writes);
}
void
skc_ring_cl_svm_fine_free(struct skc_runtime_impl * const runtime_impl, union skc_ring * const ring)
{
clSVMFree(runtime_impl->context,ring);
}
//
//
//
skc_uint
skc_ring_cl_svm_fine_read(union skc_ring * const ring, skc_uint const n)
{
return atomic_fetch_add_explicit(&ring->reads,n,std::memory_order_relaxed);
}
skc_uint
skc_ring_cl_svm_fine_write(union skc_ring * const ring, skc_uint const n)
{
return atomic_fetch_add_explicit(&ring->writes,n,std::memory_order_relaxed);
}
//
//
//
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