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ant/src/modules/timer.c
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timer.c
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#include <compat.h> // IWYU pragma: keep
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif
#include "arena.h"
#include "runtime.h"
#include "modules/timer.h"
typedef struct timer_entry {
jsval_t callback;
uint64_t target_time_ms;
uint64_t interval_ms;
int timer_id;
int active;
int is_interval;
struct timer_entry *next;
} timer_entry_t;
typedef struct microtask_entry {
jsval_t callback;
uint32_t promise_id;
struct microtask_entry *next;
} microtask_entry_t;
typedef struct immediate_entry {
jsval_t callback;
int immediate_id;
int active;
struct immediate_entry *next;
} immediate_entry_t;
static struct {
struct js *js;
timer_entry_t *timers;
microtask_entry_t *microtasks;
microtask_entry_t *microtasks_tail;
immediate_entry_t *immediates;
immediate_entry_t *immediates_tail;
int next_timer_id;
int next_immediate_id;
} timer_state = {NULL, NULL, NULL, NULL, NULL, NULL, 1, 1};
static uint64_t get_current_time_ms(void) {
#ifdef _WIN32
LARGE_INTEGER freq, count;
QueryPerformanceFrequency(&freq);
QueryPerformanceCounter(&count);
return (uint64_t)(count.QuadPart * 1000 / freq.QuadPart);
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * 1000 + (uint64_t)tv.tv_usec / 1000;
#endif
}
// setTimeout(callback, delay)
static jsval_t js_set_timeout(struct js *js, jsval_t *args, int nargs) {
if (nargs < 2) {
return js_mkerr(js, "setTimeout requires 2 arguments (callback, delay)");
}
jsval_t callback = args[0];
double delay_ms = js_getnum(args[1]);
if (delay_ms < 0) {
return js_mkerr(js, "setTimeout delay must be non-negative");
}
timer_entry_t *entry = ANT_GC_MALLOC(sizeof(timer_entry_t));
if (entry == NULL) {
return js_mkerr(js, "failed to allocate timer");
}
entry->callback = callback;
entry->target_time_ms = get_current_time_ms() + (uint64_t)delay_ms;
entry->interval_ms = 0;
entry->timer_id = timer_state.next_timer_id++;
entry->active = 1;
entry->is_interval = 0;
entry->next = timer_state.timers;
timer_state.timers = entry;
return js_mknum((double)entry->timer_id);
}
// setInterval(callback, delay)
static jsval_t js_set_interval(struct js *js, jsval_t *args, int nargs) {
if (nargs < 2) {
return js_mkerr(js, "setInterval requires 2 arguments (callback, delay)");
}
jsval_t callback = args[0];
double delay_ms = js_getnum(args[1]);
if (delay_ms < 0) {
return js_mkerr(js, "setInterval delay must be non-negative");
}
timer_entry_t *entry = ANT_GC_MALLOC(sizeof(timer_entry_t));
if (entry == NULL) {
return js_mkerr(js, "failed to allocate timer");
}
entry->callback = callback;
entry->target_time_ms = get_current_time_ms() + (uint64_t)delay_ms;
entry->interval_ms = (uint64_t)delay_ms;
entry->timer_id = timer_state.next_timer_id++;
entry->active = 1;
entry->is_interval = 1;
entry->next = timer_state.timers;
timer_state.timers = entry;
return js_mknum((double)entry->timer_id);
}
// clearTimeout(timerId)
static jsval_t js_clear_timeout(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) {
return js_mkundef();
}
int timer_id = (int)js_getnum(args[0]);
for (timer_entry_t *entry = timer_state.timers; entry != NULL; entry = entry->next) {
if (entry->timer_id == timer_id) {
entry->active = 0;
break;
}
}
return js_mkundef();
}
// setImmediate(callback)
static jsval_t js_set_immediate(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) {
return js_mkerr(js, "setImmediate requires 1 argument (callback)");
}
jsval_t callback = args[0];
immediate_entry_t *entry = ANT_GC_MALLOC(sizeof(immediate_entry_t));
if (entry == NULL) {
return js_mkerr(js, "failed to allocate immediate");
}
entry->callback = callback;
entry->immediate_id = timer_state.next_immediate_id++;
entry->active = 1;
entry->next = NULL;
if (timer_state.immediates_tail == NULL) {
timer_state.immediates = entry;
timer_state.immediates_tail = entry;
} else {
timer_state.immediates_tail->next = entry;
timer_state.immediates_tail = entry;
}
return js_mknum((double)entry->immediate_id);
}
// clearImmediate(immediateId)
static jsval_t js_clear_immediate(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) return js_mkundef();
int immediate_id = (int)js_getnum(args[0]);
for (immediate_entry_t *entry = timer_state.immediates; entry != NULL; entry = entry->next) {
if (entry->immediate_id == immediate_id) { entry->active = 0; break; }
}
return js_mkundef();
}
// queueMicrotask(callback)
static jsval_t js_queue_microtask(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) {
return js_mkerr(js, "queueMicrotask requires 1 argument (callback)");
}
queue_microtask(js, args[0]);
return js_mkundef();
}
void queue_microtask(struct js *js, jsval_t callback) {
microtask_entry_t *entry = ANT_GC_MALLOC(sizeof(microtask_entry_t));
if (entry == NULL) return;
entry->callback = callback;
entry->promise_id = 0;
entry->next = NULL;
if (timer_state.microtasks_tail == NULL) {
timer_state.microtasks = entry;
timer_state.microtasks_tail = entry;
} else {
timer_state.microtasks_tail->next = entry;
timer_state.microtasks_tail = entry;
}
}
void queue_promise_trigger(uint32_t promise_id) {
microtask_entry_t *entry = ANT_GC_MALLOC(sizeof(microtask_entry_t));
if (entry == NULL) return;
entry->callback = 0;
entry->promise_id = promise_id;
entry->next = NULL;
if (timer_state.microtasks_tail == NULL) {
timer_state.microtasks = entry;
timer_state.microtasks_tail = entry;
} else {
timer_state.microtasks_tail->next = entry;
timer_state.microtasks_tail = entry;
}
}
void process_microtasks(struct js *js) {
js_set_gc_suppress(js, true);
while (timer_state.microtasks != NULL) {
microtask_entry_t *entry = timer_state.microtasks;
timer_state.microtasks = entry->next;
if (timer_state.microtasks == NULL) {
timer_state.microtasks_tail = NULL;
}
if (entry->promise_id != 0) {
js_process_promise_handlers(js, entry->promise_id);
} else {
jsval_t args[0];
js_call(js, entry->callback, args, 0);
}
ANT_GC_FREE(entry);
}
js_set_gc_suppress(js, false);
js_check_unhandled_rejections(js);
}
void process_immediates(struct js *js) {
while (timer_state.immediates != NULL) {
immediate_entry_t *entry = timer_state.immediates;
timer_state.immediates = entry->next;
if (timer_state.immediates == NULL) {
timer_state.immediates_tail = NULL;
}
if (entry->active) {
jsval_t args[0];
js_call(js, entry->callback, args, 0);
process_microtasks(js);
}
ANT_GC_FREE(entry);
}
}
int has_pending_immediates(void) {
for (
immediate_entry_t *entry = timer_state.immediates;
entry != NULL; entry = entry->next
) if (entry->active) return 1;
return 0;
}
static void remove_timer(timer_entry_t *target) {
timer_entry_t **ptr = &timer_state.timers;
scan:
if (!*ptr) return;
if (*ptr == target) {
*ptr = target->next;
ANT_GC_FREE(target); return;
}
ptr = &(*ptr)->next;
goto scan;
}
void process_timers(struct js *js) {
uint64_t current_time = get_current_time_ms();
timer_entry_t **ptr = &timer_state.timers;
timer_entry_t *entry;
scan:
if (!*ptr) return;
entry = *ptr;
if (!entry->active) {
*ptr = entry->next;
ANT_GC_FREE(entry);
goto scan;
}
if (current_time < entry->target_time_ms) {
ptr = &entry->next;
goto scan;
}
jsval_t args[0];
js_call(js, entry->callback, args, 0);
process_microtasks(js);
if (entry->is_interval && entry->active) {
entry->target_time_ms = get_current_time_ms() + entry->interval_ms;
} else remove_timer(entry);
current_time = get_current_time_ms();
ptr = &timer_state.timers;
goto scan;
}
int has_pending_timers(void) {
for (timer_entry_t *entry = timer_state.timers; entry != NULL; entry = entry->next) {
if (entry->active) return 1;
}
return 0;
}
int has_pending_microtasks(void) {
return timer_state.microtasks != NULL ? 1 : 0;
}
int64_t get_next_timer_timeout(void) {
uint64_t current_time = get_current_time_ms();
int64_t min_timeout = -1;
for (timer_entry_t *entry = timer_state.timers; entry != NULL; entry = entry->next) {
if (!entry->active) continue;
int64_t timeout = (int64_t)entry->target_time_ms - (int64_t)current_time;
if (timeout <= 0) return 0;
if (min_timeout == -1 || timeout < min_timeout) min_timeout = timeout;
}
return min_timeout;
}
void init_timer_module() {
struct js *js = rt->js;
timer_state.js = js;
jsval_t global = js_glob(js);
js_set(js, global, "setTimeout", js_mkfun(js_set_timeout));
js_set(js, global, "clearTimeout", js_mkfun(js_clear_timeout));
js_set(js, global, "setInterval", js_mkfun(js_set_interval));
js_set(js, global, "clearInterval", js_mkfun(js_clear_timeout));
js_set(js, global, "setImmediate", js_mkfun(js_set_immediate));
js_set(js, global, "clearImmediate", js_mkfun(js_clear_immediate));
js_set(js, global, "queueMicrotask", js_mkfun(js_queue_microtask));
}
void timer_gc_update_roots(GC_FWD_ARGS) {
for (timer_entry_t *t = timer_state.timers; t; t = t->next) {
t->callback = fwd_val(ctx, t->callback);
}
for (microtask_entry_t *m = timer_state.microtasks; m; m = m->next) {
if (m->promise_id == 0) m->callback = fwd_val(ctx, m->callback);
}
for (immediate_entry_t *i = timer_state.immediates; i; i = i->next) {
i->callback = fwd_val(ctx, i->callback);
}
}

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