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Allow stack limit to be set; add Coroutine to stack on demand
jonroach 18 Nov 2025 12:22
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7 months ago
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 #include <stdio.h>
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 #include <stddef.h>
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 #include "coroutine.h"
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 #include "generator.h"
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 #include "asleep.h"
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 #include "task.h"
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 #include <dirent.h>
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 #include <string.h>
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 #include <stdlib.h>
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 #include <time.h>
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 Coroutine *cor_main;
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 typedef struct {
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 intptr_t headroom;
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 bool canstartcoroutine;
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 } TestResult;
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 void *stacktest(
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 void *param
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 ){
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 TestResult *testresult = (TestResult *)param;
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 if (Coroutine_CanStartCoroutine()){
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 Coroutine *cor = Coroutine_New(stacktest);
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 Coroutine_Delete(cor);
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 }
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 testresult->headroom = Coroutine_GetStackHeadroom();
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 testresult->canstartcoroutine = Coroutine_CanStartCoroutine();
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 return NULL;
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 }
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 int main(int argc, char *argv[]) {
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 (void)argc;
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 (void)argv;
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 unsigned char *stack_now = (unsigned char *)&argc;
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 printf("Various stack headrooms:\n");
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 intptr_t limitnocoroutine;
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 TestResult testresult;
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 // what stack do we get with no stack limit set
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 Coroutine_StartSystem();
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 cor_main = Coroutine_New(stacktest);
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 limitnocoroutine = Coroutine_GetStackHeadroom();
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 Coroutine_Run_Coroutine(cor_main, &testresult);
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 Coroutine_Delete(cor_main);
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 printf("No stack limit: %ld %ld %d\n", limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
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 Coroutine_StopSystem();
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 // what stack do we get with an undersize stack limit
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 for (intptr_t stacksize = COROUTINE_STACK_SIZE/2; stacksize < COROUTINE_STACK_SIZE*4; stacksize += COROUTINE_STACK_SIZE/2){
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 Coroutine_StartSystem();
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 Coroutine_SetStackLimit(stack_now - stacksize);
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 cor_main = Coroutine_New(stacktest);
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 limitnocoroutine = Coroutine_GetStackHeadroom();
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 Coroutine_Run_Coroutine(cor_main, &testresult);
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 Coroutine_Delete(cor_main);
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 printf("Stack=%ld: %ld, %ld %d\n", stacksize, limitnocoroutine, testresult.headroom, testresult.canstartcoroutine);
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 Coroutine_StopSystem();
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 }
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 }
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