OpenMP: #pragma omp for (dynamic)

omp_for_dynamic.txt

#include <stdio.h>
#include <stdlib.h>
#include <omp.h>

void do_sth_else(void) { return; }

int main(void)
{
	int i, n = 100; 

#pragma omp for schedule(runtime)
	for (i = 0; i < n; i++)
		do_sth_else();

	return 0;
}

==============================================================================
After OpenMP lowering and expansion:
==============================================================================

/* libgomp/loop.c:
 * GOMP_loop_runtime_start
 * GOMP_loop_runtime_next
 * GOMP_loop_end
 */

extern bool GOMP_loop_runtime_start(long start, long end, long incr, long *istart, long *iend);
extern bool GOMP_loop_runtime_next(long *istart, long *iend);
extern void GOMP_loop_end(void);

int main(void)
{
	int from, to;
	int i;

	__builtin_GOMP_loop_runtime_start(0, n, 1, &from, &to);

	do {
		for (i = from; i < to; i++) {
			do_sth_else();
		}
	} while (__builtin_GOMP_loop_runtime_next(&from, &to));

	__builtin_GOMP_loop_end();

	return 0;
}