open_issues/performance/io_system/test-mach.c


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#define _GNU_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <mach/mach.h>
int main(void) {
	struct timeval tv1, tv2;
	int i;
	task_t task;
	task = mach_task_self();
	mach_port_urefs_t refs;
	gettimeofday(&tv1, NULL);
	for (i = 0; i < 1000000; i++) {
		mach_port_get_refs(task, task, MACH_PORT_RIGHT_RECEIVE, &refs);
	}
	gettimeofday(&tv2, NULL);
	printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec);
	return 0;
}