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