build/pthreadpool-source/examples/addition.c

#include <stdio.h>
#include <stdint.h>
#include <assert.h>

#include <pthreadpool.h>

struct array_addition_context {
	double *augend;
	double *addend;
	double *sum;
};

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;
}