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chromium / external / github.com / google / pthreadpool / refs/heads/upstream/main
commitd90cd6f1493e09d12c407243f7f331a8cda55efb[log] [tgz]
authorFrank Barchard <[email protected]>Wed Nov 05 20:03:13 2025
committerXNNPACK Team <[email protected]>Wed Nov 05 20:03:43 2025
tree5e8a73d5a53fc4635ef028c020f0030e22dca894
parent0e6ca13779b57d397a5ba6bfdcaa8a275bc8ea2e [diff]
pthreadpool fix strict prototype error

  - add void to inline functions to satisfy strict prototype build error

PiperOrigin-RevId: 828572077
4 files changed
tree: 5e8a73d5a53fc4635ef028c020f0030e22dca894
  1. .github/
  2. bench/
  3. cmake/
  4. examples/
  5. include/
  6. jni/
  7. scripts/
  8. src/
  9. test/
  10. .clang-format
  11. BUILD.bazel
  12. CMakeLists.txt
  13. configure.py
  14. confu.yaml
  15. CONTRIBUTING.md
  16. LICENSE
  17. MODULE.bazel
  18. README.md
  19. WORKSPACE
README.md

pthreadpool

BSD (2 clause) License

pthreadpool is a portable and efficient thread pool implementation. It provides similar functionality to #pragma omp parallel for, but with additional features.

This is a Google-maintained fork of the original http://github.com/Maratyszcza/pthreadpool repository.

Features:

  • C interface (C++-compatible).
  • 1D-6D loops with step parameters.
  • Run on user-specified or auto-detected number of threads.
  • Work-stealing scheduling for efficient work balancing.
  • Wait-free synchronization of work items.
  • Compatible with Linux (including Android), macOS, iOS, Windows, Emscripten environments.
  • 100% unit tests coverage.
  • Throughput and latency microbenchmarks.

Example

The following example demonstrates using the thread pool for parallel addition of two arrays:

static void add_arrays(struct array_addition_context* context, size_t i) {
  context->sum[i] = context->augend[i] + context->addend[i];
}

#define ARRAY_SIZE 4

int main() {
  double augend[ARRAY_SIZE] = { 1.0, 2.0, 4.0, -5.0 };
  double addend[ARRAY_SIZE] = { 0.25, -1.75, 0.0, 0.5 };
  double sum[ARRAY_SIZE];

  pthreadpool_t threadpool = pthreadpool_create(0);
  assert(threadpool != NULL);

  const size_t threads_count = pthreadpool_get_threads_count(threadpool);
  printf("Created thread pool with %zu threads\n", threads_count);

  struct array_addition_context context = { augend, addend, sum };
  pthreadpool_parallelize_1d(threadpool,
    (pthreadpool_task_1d_t) add_arrays,
    (void*) &context,
    ARRAY_SIZE,
    PTHREADPOOL_FLAG_DISABLE_DENORMALS /* flags */);

  pthreadpool_destroy(threadpool);
  threadpool = NULL;

  printf("%8s\t%.2lf\t%.2lf\t%.2lf\t%.2lf\n", "Augend",
    augend[0], augend[1], augend[2], augend[3]);
  printf("%8s\t%.2lf\t%.2lf\t%.2lf\t%.2lf\n", "Addend",
    addend[0], addend[1], addend[2], addend[3]);
  printf("%8s\t%.2lf\t%.2lf\t%.2lf\t%.2lf\n", "Sum",
    sum[0], sum[1], sum[2], sum[3]);

  return 0;
}