commit | 1325d6e4c2978a54558f546b8b9c6e107a60f435 | [log] [tgz] |
---|---|---|
author | Marat Dukhan <maratek@gmail.com> | Sun Jul 03 13:13:16 2016 -0400 |
committer | Marat Dukhan <maratek@gmail.com> | Sun Jul 03 13:13:16 2016 -0400 |
tree | a6f5917d441e1612b45710f7ae3ad655f0738ddd | |
parent | ab8e10225f670bbfe41824b7146cf12bc6811271 [diff] |
Use FXdiv for 2D loops
pthreadpool is a pthread-based thread pool implementation. Is is intended to provide functionality of #pragma omp parallel for
for POSIX systems where OpenMP is not available.
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_compute_1d(threadpool, (pthreadpool_function_1d_t) add_arrays, (void**) &context, ARRAY_SIZE); 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; }