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Allow stack limit to be set; add Coroutine to stack on demand
jonroach 18 Nov 2025 12:22
1 contributor
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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
14Coroutine *cor_main;
15
16typedef struct {
17 intptr_t headroom;
18 bool canstartcoroutine;
19} TestResult;
20
21
22void *stacktest(
23 void *param
24){
25 TestResult *testresult = (TestResult *)param;
26 if (Coroutine_CanStartCoroutine()){
27 Coroutine *cor = Coroutine_New(stacktest);
28 Coroutine_Delete(cor);
29 }
30 testresult->headroom = Coroutine_GetStackHeadroom();
31 testresult->canstartcoroutine = Coroutine_CanStartCoroutine();
32
33 return NULL;
34}
35
36
37int main(int argc, char *argv[]) {
38 (void)argc;
39 (void)argv;
40
41 unsigned char *stack_now = (unsigned char *)&argc;
42
43 printf("Various stack headrooms:\n");
44 intptr_t limitnocoroutine;
45 TestResult testresult;
46
47 // what stack do we get with no stack limit set
48 Coroutine_StartSystem();
49 cor_main = Coroutine_New(stacktest);
50 limitnocoroutine = Coroutine_GetStackHeadroom();
51 Coroutine_Run_Coroutine(cor_main, &testresult);
52 Coroutine_Delete(cor_main);
53 printf("No stack limit: %ld %ld %d\n", limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
54 Coroutine_StopSystem();
55
56 // what stack do we get with an undersize stack limit
57 for (intptr_t stacksize = COROUTINE_STACK_SIZE/2; stacksize < COROUTINE_STACK_SIZE*4; stacksize += COROUTINE_STACK_SIZE/2){
58 Coroutine_StartSystem();
59 Coroutine_SetStackLimit(stack_now - stacksize);
60 cor_main = Coroutine_New(stacktest);
61 limitnocoroutine = Coroutine_GetStackHeadroom();
62 Coroutine_Run_Coroutine(cor_main, &testresult);
63 Coroutine_Delete(cor_main);
64 printf("Stack=%ld: %ld, %ld %d\n", stacksize, limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
65 Coroutine_StopSystem();
66 }
67}
68