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android / platform / external / pthreadpool / refs/heads/android15-tests-dev
commitb095b0533730c2930f947df924a4486d266faa1a[log] [tgz]
authorXin Li <[email protected]>Mon Apr 29 21:50:11 2024 +0000
committerAutomerger Merge Worker <[email protected]>Mon Apr 29 21:50:11 2024 +0000
tree49c8f40c84842ec7947709cc1c75c50e9a725fe4
parent23a7851e9b91c2b0f2d2a3a5c47939d805ac0d9d [diff]
parent4049cad0217aa07ae23db5bc3203770686066708 [diff]
[automerger skipped] Empty merge of Android 24Q2 Release (ab/11526283) to aosp-main-future am: 4049cad021 -s ours

am skip reason: Merged-In Icd8f90aeb6d25ed7bf959d9be8eae00f12c83a1d with SHA-1 f355e616e1 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/pthreadpool/+/27144993

Change-Id: Ia3560180dd7f056765d9ad6255cac6d347972157
Signed-off-by: Automerger Merge Worker <[email protected]>
tree: 49c8f40c84842ec7947709cc1c75c50e9a725fe4
  1. bench/
  2. cmake/
  3. examples/
  4. include/
  5. src/
  6. test/
  7. .gitignore
  8. .travis.yml
  9. Android.bp
  10. BUILD.bazel
  11. CMakeLists.txt
  12. configure.py
  13. confu.yaml
  14. LICENSE
  15. METADATA
  16. MODULE_LICENSE_BSD
  17. OWNERS
  18. README.md
  19. TEST_MAPPING
  20. WORKSPACE
README.md

pthreadpool

BSD (2 clause) License Build Status

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

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 demonstates 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;
}