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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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9 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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 #define DEMO_STACK_SIZE (8192*sizeof(void *))
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 void *chaindeeper(void *param){
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 // enough headroom for printf on an Intel Mac - your system may be different
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 if (Coroutine_GetStackHeadroom() < 2000){
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 void *result;
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 bool fail = Coroutine_Chain(DEMO_STACK_SIZE, 0, chaindeeper, param, &result);
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 return fail ? NULL : result;
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 }
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 printf("%ld %ld\n", (long)param, Coroutine_GetStackHeadroom());
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 bool domore = Generator_Yield(param);
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 if (domore){
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 long depth = (long)param;
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 if (depth > 1000){
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 return NULL;
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 }
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 return chaindeeper((void *)(depth + 1));
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 }
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 return NULL;
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 }
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 void *chaintest(
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 void *param
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 ){
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 (void)param;
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 // Need to run two coroutines so that at least one of their stacks is limited, and so
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 // needs to chain
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 Generator gen1;
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 Generator_ctor(&gen1, DEMO_STACK_SIZE, 0, chaindeeper, 0);
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 Generator gen2;
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 Generator_ctor(&gen2, DEMO_STACK_SIZE, 0, chaindeeper, 0);
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 void *param1;
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 void *param2;
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 while(Generator_Next(&gen1, &param1) && Generator_Next(&gen2, &param2)){
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 }
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 Generator_dtor(&gen2);
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 Generator_dtor(&gen1);
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 Coroutine_Report report = Coroutine_GetReport();
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 printf("%d routines using a pool of %d, min headroom %zu\n", report.coroutines_created, report.coroutines_pool_size, report.lowest_headroom);
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 return param;
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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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 Coroutine_Run(DEMO_STACK_SIZE, 0, chaintest, NULL, NULL);
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 return 0;
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 }
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