commit | 4f3a046050d1677fc6155131026e4feea2e76814 | [log] [tgz] |
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author | android-build-team Robot <android-build-team-robot@google.com> | Sat Apr 11 02:08:32 2020 +0000 |
committer | android-build-team Robot <android-build-team-robot@google.com> | Sat Apr 11 02:08:32 2020 +0000 |
tree | 9d2475b6e71d04d43b684326efe4b5dd235617b2 | |
parent | 42d635168b2869a4106c4926fade0e532c49a623 [diff] | |
parent | 3bc3e7374a22b4e3bfc7a4610f9e900fd371e032 [diff] |
Snap for 6386567 from 3bc3e7374a22b4e3bfc7a4610f9e900fd371e032 to sc-release Change-Id: I1d2a3b2eb4bf552e5664fefc1f87a3db7e3487f2
pthreadpool is a portable and efficient thread pool implementation. It provides similar functionality to #pragma omp parallel for
, but with additional features.
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; }