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Unique .so paths to support multiple CUDA delegates #19056

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Unique .so paths to support multiple CUDA delegates #19056

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9 changes: 7 additions & 2 deletions backends/cuda/runtime/cuda_backend.cpp
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Original file line number Diff line number Diff line change
@@ -1,3 +1,3 @@
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* All rights reserved.
Expand All @@ -17,6 +17,7 @@
#include <cstdio>

#include <array>
#include <atomic>
#include <filesystem>
#include <fstream>
#include <mutex>
Expand Down Expand Up @@ -314,10 +315,14 @@
so_blob_key.c_str(),
static_cast<uint32_t>(aoti_dso_buffer.error()));

// Generate dynamic temporary file path
// Generate dynamic temporary file path with unique counter to support
// multiple CUDA delegates in the same process. Atomic to avoid races
// when multiple delegates are loaded concurrently.
static std::atomic<int> delegate_counter{0};
int delegate_id = delegate_counter.fetch_add(1, std::memory_order_relaxed);
filesystem::path temp_dir = filesystem::temp_directory_path();
filesystem::path so_path =
temp_dir / (so_blob_key + to_string(get_process_id()) + ".so");
temp_dir / (so_blob_key + to_string(get_process_id()) + "_" + to_string(delegate_id) + ".so");

// Create a temporary file
ofstream outfile(so_path, ios::binary);
Expand Down
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