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Remove need for malloc by Coroutine, and add Coroutine_Err
jonroach
on 12:28 AM Feb 20 2026
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#include "future.h"
#include "coroutine.h"
#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"
Future_vfptrs_t Future_vfptrs = {
&Future_dtor,
&_Future_Await,
&_Future_SetResult
};
typedef struct Future_WatcherSpec {
Future_Watcher watcher;
void *me;
} Future_WatcherSpec;
void Future_ctor(Future *fut){
fut->vfptrs = &Future_vfptrs;
_Cor_Mutex_ctor(&fut->mutex);
fut->state = Future_State_Waiting;
fut->value = NULL;
fut->canceled = false;
fut->watchers = NULL;
fut->nwatchers = 0;
fut->maxwatchers = 0;
}
Future *Future_New(){
Future *fut = malloc(sizeof(Future));
Future_ctor(fut);
return fut;
}
void Future_dtor(
Future *fut
){
_Cor_Mutex_Lock(&fut->mutex);
assert(fut->nwatchers == 0);
free(fut->watchers);
_Cor_Mutex_Unlock(&fut->mutex);
_Cor_Mutex_dtor(&fut->mutex);
}
void Future_Delete(
Future *fut
){
fut->vfptrs->dtor(fut);
free(fut);
}
void Future_AddWatcher(
Future *fut,
Future_Watcher watcher,
void *watcher_me
){
_Cor_Mutex_Lock(&fut->mutex);
if (fut->state == Future_State_Done) {
_Cor_Mutex_Unlock(&fut->mutex);
watcher(watcher_me, fut);
} else {
if (fut->nwatchers >= fut->maxwatchers) {
fut->maxwatchers = (fut->maxwatchers == 0) ? 4 : fut->maxwatchers * 2;
fut->watchers = realloc(fut->watchers, fut->maxwatchers * sizeof(Future_WatcherSpec));
assert(fut->watchers);
}
fut->watchers[fut->nwatchers].watcher = watcher;
fut->watchers[fut->nwatchers].me = watcher_me;
fut->nwatchers++;
_Cor_Mutex_Unlock(&fut->mutex);
}
}
void Future_RemoveWatcher(
Future *fut,
Future_Watcher watcher,
void *watcher_me
){
_Cor_Mutex_Lock(&fut->mutex);
for (int i = 0; i < fut->nwatchers; i++) {
if (fut->watchers[i].watcher == watcher && fut->watchers[i].me == watcher_me) {
fut->nwatchers--;
if (i < fut->nwatchers) {
fut->watchers[i] = fut->watchers[fut->nwatchers];
}
break;
}
}
_Cor_Mutex_Unlock(&fut->mutex);
}
static void _Future_Ready(
Future *fut
){
fut->state = Future_State_Done;
// Take note of watchers list, and reset it
Future_WatcherSpec *watchers = fut->watchers;
int nwatchers = fut->nwatchers;
fut->watchers = NULL;
fut->nwatchers = 0;
_Cor_Mutex_Unlock(&fut->mutex);
// notify those watchers
for (int i = 0; i < nwatchers; i++) {
watchers[i].watcher(watchers[i].me, fut);
}
free(watchers);
}
void Future_SetResult(
Future *fut,
bool canceled,
void *value
){
fut->vfptrs->set_result(fut, canceled, value);
}
bool Future_GetResult(
Future *fut,
void **res
){
assert(fut->state == Future_State_Done);
if (res){
*res = fut->value;
}
return fut->canceled;
}
typedef struct future_bits {
Future *fut;
Coroutine *cor;
} future_bits;
static void future_complete(
void *me,
Future *fut
){
(void)fut;
Coroutine *cor = (Coroutine *)me;
Coroutine_Continue(cor, NULL, false);
}
static void on_yield_for_future(
void *me
){
future_bits *bits = (future_bits *)me;
Future_AddWatcher(bits->fut, future_complete, bits->cor);
}
void _Future_Await(
Future *fut
){
future_bits bits;
bits.fut = fut;
bits.cor = Coroutine_GetActive();
Task *my_task = current_task;
current_task = NULL;
my_task->awaiting_future = fut;
if (my_task->canceled){
Future_SetResult(fut, true, my_task->cancel_value);
}
Coroutine_Yield(NULL, on_yield_for_future, &bits);
my_task->awaiting_future = NULL;
current_task = my_task;
}
void _Future_SetResult(
Future *fut,
bool canceled,
void *res
){
_Cor_Mutex_Lock(&fut->mutex);
if(fut->state == Future_State_Waiting){
fut->canceled = canceled;
fut->value = res;
_Future_Ready(fut);
} else {
_Cor_Mutex_Unlock(&fut->mutex);
}
}
bool Future_Await(
Future *fut,
void **res
){
fut->vfptrs->await(fut);
if (res){
*res = fut->value;
}
return fut->canceled;
}
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#include "future.h"
#include "coroutine.h"
#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"
Future_vfptrs_t Future_vfptrs = {
&Future_dtor,
&_Future_Await,
&_Future_SetResult
};
typedef struct Future_WatcherSpec {
Future_Watcher watcher;
void *me;
} Future_WatcherSpec;
void Future_ctor(Future *fut){
fut->vfptrs = &Future_vfptrs;
_Cor_Mutex_ctor(&fut->mutex);
fut->state = Future_State_Waiting;
fut->value = NULL;
fut->canceled = false;
fut->watchers = NULL;
fut->nwatchers = 0;
fut->maxwatchers = 0;
}
Future *Future_New(){
Future *fut = malloc(sizeof(Future));
Future_ctor(fut);
return fut;
}
void Future_dtor(
Future *fut
){
_Cor_Mutex_Lock(&fut->mutex);
assert(fut->nwatchers == 0);
free(fut->watchers);
_Cor_Mutex_Unlock(&fut->mutex);
_Cor_Mutex_dtor(&fut->mutex);
}
void Future_Delete(
Future *fut
){
fut->vfptrs->dtor(fut);
free(fut);
}
void Future_AddWatcher(
Future *fut,
Future_Watcher watcher,
void *watcher_me
){
_Cor_Mutex_Lock(&fut->mutex);
if (fut->state == Future_State_Done) {
_Cor_Mutex_Unlock(&fut->mutex);
watcher(watcher_me, fut);
} else {
if (fut->nwatchers >= fut->maxwatchers) {
fut->maxwatchers = (fut->maxwatchers == 0) ? 4 : fut->maxwatchers * 2;
fut->watchers = realloc(fut->watchers, fut->maxwatchers * sizeof(Future_WatcherSpec));
assert(fut->watchers);
}
fut->watchers[fut->nwatchers].watcher = watcher;
fut->watchers[fut->nwatchers].me = watcher_me;
fut->nwatchers++;
_Cor_Mutex_Unlock(&fut->mutex);
}
}
void Future_RemoveWatcher(
Future *fut,
Future_Watcher watcher,
void *watcher_me
){
_Cor_Mutex_Lock(&fut->mutex);
for (int i = 0; i < fut->nwatchers; i++) {
if (fut->watchers[i].watcher == watcher && fut->watchers[i].me == watcher_me) {
fut->nwatchers--;
if (i < fut->nwatchers) {
fut->watchers[i] = fut->watchers[fut->nwatchers];
}
break;
}
}
_Cor_Mutex_Unlock(&fut->mutex);
}
static void _Future_Ready(
Future *fut
){
fut->state = Future_State_Done;
// Take note of watchers list, and reset it
Future_WatcherSpec *watchers = fut->watchers;
int nwatchers = fut->nwatchers;
fut->watchers = NULL;
fut->nwatchers = 0;
_Cor_Mutex_Unlock(&fut->mutex);
// notify those watchers
for (int i = 0; i < nwatchers; i++) {
watchers[i].watcher(watchers[i].me, fut);
}
free(watchers);
}
void Future_SetResult(
Future *fut,
bool canceled,
void *value
){
fut->vfptrs->set_result(fut, canceled, value);
}
Coroutine_Err Future_GetResult(
Future *fut,
void **res
){
if(fut->state != Future_State_Done){
return Coroutine_Err_WrongState;
}
if (res){
*res = fut->value;
}
return fut->canceled ? Coroutine_Err_Canceled : Coroutine_OK;
}
typedef struct future_bits {
Future *fut;
Coroutine *cor;
} future_bits;
static void future_complete(
void *me,
Future *fut
){
(void)fut;
Coroutine *cor = (Coroutine *)me;
Coroutine_Continue(cor, NULL, false);
}
static void on_yield_for_future(
void *me
){
future_bits *bits = (future_bits *)me;
Future_AddWatcher(bits->fut, future_complete, bits->cor);
}
void _Future_Await(
Future *fut
){
future_bits bits;
bits.fut = fut;
bits.cor = Coroutine_GetActive();
Task *my_task = current_task;
current_task = NULL;
my_task->awaiting_future = fut;
if (my_task->canceled){
Future_SetResult(fut, true, my_task->cancel_value);
}
Coroutine_Yield(NULL, on_yield_for_future, &bits);
my_task->awaiting_future = NULL;
current_task = my_task;
}
void _Future_SetResult(
Future *fut,
bool canceled,
void *res
){
_Cor_Mutex_Lock(&fut->mutex);
if(fut->state == Future_State_Waiting){
fut->canceled = canceled;
fut->value = res;
_Future_Ready(fut);
} else {
_Cor_Mutex_Unlock(&fut->mutex);
}
}
Coroutine_Err Future_Await(
Future *fut,
void **res
){
fut->vfptrs->await(fut);
if (res){
*res = fut->value;
}
return fut->canceled ? Coroutine_Err_Canceled : Coroutine_OK;
}