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* libucontext test program based on POSIX example program.
* Public domain.
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <libucontext/libucontext.h>
static libucontext_ucontext_t ctx[3];
static void check_arg(int actual, int expected) {
if (actual == expected) return;
fprintf(stderr, "argument has wrong value. got %d, expected %d.\n", actual, expected);
static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j) {
printf("start f1\n");
printf("checking provided arguments to function f1\n");
check_arg(a, 1);
check_arg(b, 2);
check_arg(c, 3);
check_arg(d, 4);
check_arg(e, 5);
check_arg(f, 6);
check_arg(g, 7);
check_arg(h, 8);
check_arg(i, 9);
check_arg(j, 10);
printf("looks like all arguments are passed correctly\n");
printf("swap back to f2\n");
libucontext_swapcontext(&ctx[1], &ctx[2]);
printf("finish f1\n");
static void f2 (void) {
printf("start f2\n");
printf("swap to f1\n");
libucontext_swapcontext(&ctx[2], &ctx[1]);
printf("finish f2, should swap to f1\n");
int main (int argc, const char *argv[]) {
char st1[8192];
char st2[8192];
volatile int done = 0;
/* poison each coroutine's stack memory for debugging purposes */
memset(st1, 'A', sizeof st1);
memset(st2, 'B', sizeof st2);
printf("setting up context 1\n");
ctx[1].uc_stack.ss_sp = st1;
ctx[1].uc_stack.ss_size = sizeof st1;
ctx[1].uc_link = &ctx[0];
libucontext_makecontext(&ctx[1], f1, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
printf("setting up context 2\n");
ctx[2].uc_stack.ss_sp = st2;
ctx[2].uc_stack.ss_size = sizeof st2;
ctx[2].uc_link = &ctx[1];
libucontext_makecontext(&ctx[2], f2, 0);
printf("doing initial swapcontext\n");
libucontext_swapcontext(&ctx[0], &ctx[2]);
printf("returned from initial swapcontext\n");
/* test ability to use getcontext/setcontext without makecontext */
printf("done = %d\n", done);
if (done++ == 0) libucontext_setcontext(&ctx[1]);
if (done != 2) {
fprintf(stderr, "wrong value for done. got %d, expected 2\n", done);
return 0;