53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#pragma once
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#include <atomic>
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#include <cstddef>
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#include <exception>
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#include <c10/util/Exception.h>
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#ifdef _WIN32
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#endif
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#include <tbb/tbb.h>
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#define INTRA_OP_PARALLEL
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namespace at::internal {
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template <typename F>
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inline void invoke_parallel(
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const int64_t begin,
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const int64_t end,
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const int64_t grain_size,
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const F& f) {
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// Choose number of tasks based on grain size and number of threads.
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int64_t chunk_size = divup((end - begin), get_num_threads());
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// Make sure each task is at least grain_size size.
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chunk_size = std::max(grain_size, chunk_size);
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std::atomic_flag err_flag = ATOMIC_FLAG_INIT;
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std::exception_ptr eptr;
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tbb::parallel_for(
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tbb::blocked_range<int64_t>(begin, end, chunk_size),
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[&eptr, &err_flag, f](const tbb::blocked_range<int64_t>& r) {
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try {
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internal::ThreadIdGuard tid_guard(
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tbb::this_task_arena::current_thread_index());
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f(r.begin(), r.end());
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} catch (...) {
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if (!err_flag.test_and_set()) {
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eptr = std::current_exception();
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}
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}
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},
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tbb::static_partitioner{});
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if (eptr) {
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std::rethrow_exception(eptr);
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}
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}
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} // namespace at::internal
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