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Generator works with chaining - adjust chaining demo to actually chain (using generators)
jonroach 9 Jun 2026 08:24
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1#include <stdio.h>
2#include <stddef.h>
3#include "coroutine.h"
4#include "generator.h"
5#include "asleep.h"
6#include "task.h"
7
8#include <dirent.h>
9#include <string.h>
10#include <stdlib.h>
11#include <time.h>
12
13#define DEMO_STACK_SIZE (8192*sizeof(void *))
14
15void *chaindeeper(void *param){
16 // enough headroom for printf on an Intel Mac - your system may be different
17 if (Coroutine_GetStackHeadroom() < 2000){
18 void *result;
19 bool fail = Coroutine_Chain(DEMO_STACK_SIZE, 0, chaindeeper, param, &result);
20 return fail ? NULL : result;
21 }
22 printf("%ld %ld\n", (long)param, Coroutine_GetStackHeadroom());
23 bool domore = Generator_Yield(param);
24 if (domore){
25 long depth = (long)param;
26 if (depth > 1000){
27 return NULL;
28 }
29 return chaindeeper((void *)(depth + 1));
30 }
31 return NULL;
32}
33
34
35void *chaintest(
36 void *param
37){
38 (void)param;
39
40 // Need to run two coroutines so that at least one of their stacks is limited, and so
41 // needs to chain
42 Generator gen1;
43 Generator_ctor(&gen1, DEMO_STACK_SIZE, 0, chaindeeper, 0);
44 Generator gen2;
45 Generator_ctor(&gen2, DEMO_STACK_SIZE, 0, chaindeeper, 0);
46 void *param1;
47 void *param2;
48 while(Generator_Next(&gen1, &param1) && Generator_Next(&gen2, &param2)){
49 }
50 Generator_dtor(&gen2);
51 Generator_dtor(&gen1);
52
53 Coroutine_Report report = Coroutine_GetReport();
54 printf("%d routines using a pool of %d, min headroom %zu\n", report.coroutines_created, report.coroutines_pool_size, report.lowest_headroom);
55
56 return param;
57}
58
59
60int main(int argc, char *argv[]) {
61 (void)argc;
62 (void)argv;
63
64 Coroutine_Run(DEMO_STACK_SIZE, 0, chaintest, NULL, NULL);
65
66 return 0;
67}
68