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WIP re-engineer for more robust operation, less chaining, and biggest-stack-possible chains
jonroach
on 4:02 PM Jun 5 2026
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#include "task.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <math.h>
#include <string.h>
#include "timespec_utils.h"
_Cor_thread_local Task *current_task;
static void _Task_SetResult(
Future *fut,
bool canceled,
void *res
){
(void)fut;
(void)canceled;
(void)res;
// only the task can set it's future's result
assert(false);
}
Future_vfptrs_t Task_vfptrs = {
(void(*)(Future *fut))&Task_dtor,
&_Future_Await,
&_Task_SetResult,
};
static void *Task_entry(void *me){
Task *tsk = (Task *)me;
void *res = NULL;
assert(current_task == NULL);
current_task = tsk;
bool canceled = tsk->entry(tsk->param, &res);
current_task = NULL;
_Future_SetResult(&tsk->base, canceled, res);
return res;
}
void Task_ctor(
Task *tsk,
size_t stack_size,
Task_Entry entry,
void *param
){
assert(Coroutine_NS(IsStarted)());
Future_ctor(&tsk->base);
tsk->base.vfptrs = &Task_vfptrs;
tsk->entry = entry;
tsk->param = param;
tsk->cor = Coroutine_NS(New)(stack_size, Task_entry);
tsk->awaiting_future = NULL;
tsk->canceled = false;
tsk->cancel_value = NULL;
if (current_task){
Coroutine_NS(Continue)(tsk->cor, tsk, false);
}
}
void Task_dtor(
Task *tsk
){
Coroutine_NS(Delete)(tsk->cor);
Future_dtor(&tsk->base);
}
Task *Task_New(
size_t stack_size,
Task_Entry entry,
void *param
){
Task *tsk = malloc(sizeof(Task));
Task_ctor(tsk, stack_size, entry, param);
return tsk;
}
void Task_Delete(
Task *tsk
){
Future_Delete(&tsk->base);
}
void Task_Cancel(
Task *tsk,
void *cancel_value
){
if (!tsk->canceled){
tsk->canceled = true;
tsk->cancel_value = cancel_value;
Future *awaiting_future = tsk->awaiting_future;
if (awaiting_future){
Future_SetResult(awaiting_future, true, NULL);
}
}
}
struct Task_Run_Params {
size_t stack_size;
Task_Entry start;
void *value;
void **res;
};
static Coroutine_Err Task_Runner(void *_params)
{
struct Task_Run_Params *params = (struct Task_Run_Params *)_params;
Task tsk;
Task_ctor(&tsk, params->stack_size, params->start, params->value);
Coroutine_Err err = Coroutine_NS(Run_Coroutine)(tsk.cor, &tsk);
if (!err){
err = Future_GetResult(&tsk.base, params->res);
}
Task_dtor(&tsk);
return err;
}
bool Task_Run(size_t stack_size, Task_Entry start, void *value, void **res){
if (current_task){
return Coroutine_Err_SystemRunning;
}
struct Task_Run_Params params = {stack_size, start, value, res};
return Coroutine_NS(RunSystem)(Task_Runner, &params);
}
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#include "task.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <math.h>
#include <string.h>
#include "timespec_utils.h"
_Cor_thread_local Task *current_task;
static void
_Task_SetResult(
Future *fut,
bool canceled,
void *res
){
(void)fut;
(void)canceled;
(void)res;
// only the task can set it's future's result
assert(false);
}
Future_vfptrs_t Task_vfptrs = {
(void(*)(Future *fut))&Task_dtor,
&_Future_Await,
&_Task_SetResult,
};
static void *
Task_entry(void *me){
Task *tsk = (Task *)me;
void *res = NULL;
assert(current_task == NULL);
current_task = tsk;
bool canceled = tsk->entry(tsk->param, &res);
current_task = NULL;
_Future_SetResult(&tsk->base, canceled, res);
return res;
}
static void
Task_ctor_(
Task *tsk,
Coroutine *cor
){
assert(Coroutine_NS(IsStarted)());
Future_ctor(&tsk->base);
tsk->base.vfptrs = &Task_vfptrs;
tsk->cor = cor;
tsk->cor_owned = false;
tsk->awaiting_future = NULL;
tsk->canceled = false;
tsk->cancel_value = NULL;
if (current_task){
Coroutine_NS(Continue)(tsk->cor, tsk, false);
}
}
void
Task_ctor(
Task *tsk,
size_t min_stack,
size_t min_stack_headroom,
Task_Entry entry,
void *param
){
assert(Coroutine_NS(IsStarted)());
Task_ctor_(tsk, Coroutine_NS(New)(min_stack, min_stack_headroom, Task_entry));
tsk->cor_owned = true;
tsk->entry = entry;
tsk->param = param;
if (current_task){
Coroutine_NS(Continue)(tsk->cor, tsk, false);
}
}
void
Task_dtor(
Task *tsk
){
if (tsk->cor_owned){
Coroutine_NS(Delete)(tsk->cor);
}
Future_dtor(&tsk->base);
}
Task *
Task_New(
size_t min_stack,
size_t min_stack_headroom,
Task_Entry entry,
void *param
){
Task *tsk = malloc(sizeof(Task));
Task_ctor(tsk, min_stack, min_stack_headroom, entry, param);
return tsk;
}
void
Task_Delete(
Task *tsk
){
Future_Delete(&tsk->base);
}
void
Task_Cancel(
Task *tsk,
void *cancel_value
){
if (!tsk->canceled){
tsk->canceled = true;
tsk->cancel_value = cancel_value;
Future *awaiting_future = tsk->awaiting_future;
if (awaiting_future){
Future_SetResult(awaiting_future, true, NULL);
}
}
}
struct Task_Run_Params {
size_t min_stack;
size_t min_stack_headroom;
Task_Entry start;
void *value;
void **res;
};
static Coroutine_Err
Task_Runner(
void *_params,
Coroutine *root
){
struct Task_Run_Params *params = (struct Task_Run_Params *)_params;
Task roottsk;
Task_ctor_(&roottsk, root);
current_task = &roottsk;
Task childtask;
Task_ctor(&childtask, params->min_stack, params->min_stack_headroom, params->start, params->value);
Coroutine_Err err = Task_Await(&childtask, params->res);
Task_dtor(&childtask);
current_task = NULL;
Task_dtor(&roottsk);
return err;
}
bool
Task_Run(
size_t min_stack,
size_t min_stack_headroom,
Task_Entry start,
void *value,
void **res
){
if (current_task){
return Coroutine_Err_SystemRunning;
}
struct Task_Run_Params params = {min_stack, min_stack_headroom, start, value, res};
return Coroutine_NS(RunSystem)(0, COROUTINE_STARTUP_STACK_SIZE, Task_Runner, &params);
}