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Variable stack Coroutines WIP
jonroach 23 Dec 2025 15:46
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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
15Coroutine *cor_main;
16
17typedef struct {
18 intptr_t headroom;
19 bool canstartcoroutine;
20} TestResult;
21
22
23void *stacktest(
24 void *param
25){
26 TestResult *testresult = (TestResult *)param;
27 if (Coroutine_CanStartCoroutine(DEMO_STACK_SIZE)){
28 Coroutine *cor = Coroutine_New(DEMO_STACK_SIZE, stacktest);
29 Coroutine_Delete(cor);
30 }
31 testresult->headroom = Coroutine_GetStackHeadroom();
32 testresult->canstartcoroutine = Coroutine_CanStartCoroutine(DEMO_STACK_SIZE);
33
34 return NULL;
35}
36
37
38int main(int argc, char *argv[]) {
39 (void)argc;
40 (void)argv;
41
42 unsigned char *stack_now = (unsigned char *)&argc;
43
44 printf("Various stack headrooms:\n");
45 intptr_t limitnocoroutine;
46 TestResult testresult;
47
48 // what stack do we get with no stack limit set
49 Coroutine_StartSystem();
50 cor_main = Coroutine_New(DEMO_STACK_SIZE, stacktest);
51 limitnocoroutine = Coroutine_GetStackHeadroom();
52 Coroutine_Run_Coroutine(cor_main, &testresult);
53 Coroutine_Delete(cor_main);
54 printf("No stack limit: %ld %ld %d\n", limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
55 Coroutine_StopSystem();
56
57 // what stack do we get with an undersize stack limit
58 for (size_t stacksize = DEMO_STACK_SIZE/2; stacksize < DEMO_STACK_SIZE*4; stacksize += DEMO_STACK_SIZE/2){
59 Coroutine_StartSystem();
60 Coroutine_SetStackLimit(stack_now - stacksize);
61 cor_main = Coroutine_New(DEMO_STACK_SIZE, stacktest);
62 limitnocoroutine = Coroutine_GetStackHeadroom();
63 Coroutine_Run_Coroutine(cor_main, &testresult);
64 Coroutine_Delete(cor_main);
65 printf("Stack=%ld: %ld, %ld %d\n", stacksize, limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
66 Coroutine_StopSystem();
67 }
68}
69