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refactor(thread_pool): drop the -Wmaybe-uninitialized pragma; fix it properly (true-async/server#93) #178

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Merged
EdmondDantes merged 1 commit into from
Jul 4, 2026
Merged

refactor(thread_pool): drop the -Wmaybe-uninitialized pragma; fix it properly (true-async/server#93) #178

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64 changes: 35 additions & 29 deletions thread_pool.c
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Original file line number Diff line number Diff line change
Expand Up @@ -164,17 +164,33 @@ typedef struct {
async_thread_channel_t *channel;
} thread_pool_worker_ctx_t;

/* GCC -O2 -Wmaybe-uninitialized misfires across this function's deeply nested
* zend_try blocks — flagging both loop-local task pointers and the zend_try
* macro's own __orig_bailout (all set before their SETJMP and never changed,
* hence defined per C 7.13.2.1). The macro lives in Zend/zend.h and cannot be
* annotated here, so suppress the false positive for this function only.
* GCC-only: Clang doesn't have this warning group and MSVC would warn on the
* unknown pragma (C4068). */
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
/* Call fcall under a bailout guard; returns true on bailout. Kept out of the
* worker handler so its outer zend_try does not nest another (GCC -O2 misfires
* -Wmaybe-uninitialized on the zend_try macro across nested setjmp). */
static bool thread_pool_call_guarded(zend_fcall_info *fci, zend_fcall_info_cache *fcc)
{
volatile bool bailed = false;
zend_try {
zend_call_function(fci, fcc);
} zend_catch {
bailed = true;
} zend_end_try();
return bailed;
}

/* SUSPEND under a bailout guard; returns true on bailout. Same reason as
* thread_pool_call_guarded — keeps this zend_try out of the handler's. */
static bool thread_pool_suspend_guarded(void)
{
volatile bool bailed = false;
zend_try {
ZEND_ASYNC_SUSPEND();
} zend_catch {
bailed = true;
} zend_end_try();
return bailed;
}

static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *ctx)
{
thread_pool_worker_ctx_t *wc = (thread_pool_worker_ctx_t *) ctx;
Expand Down Expand Up @@ -244,11 +260,7 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c
volatile bool boot_bailed = false;
if (zend_fcall_info_init(&boot_callable, 0, &boot_fci, &boot_fcc, NULL, NULL) == SUCCESS) {
boot_fci.retval = &boot_retval;
zend_try {
zend_call_function(&boot_fci, &boot_fcc);
} zend_catch {
boot_bailed = true;
} zend_end_try();
boot_bailed = thread_pool_call_guarded(&boot_fci, &boot_fcc);
}

zval_ptr_dtor(&boot_retval);
Expand Down Expand Up @@ -315,7 +327,8 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c

const zend_long kind =
Z_LVAL_P(zend_hash_index_find(Z_ARRVAL(task), TASK_SLOT_KIND));
zend_future_shared_state_t *state =
/* volatile: these live across the loop's zend_try longjmp (C 7.13.2.1). */
zend_future_shared_state_t * volatile state =
(zend_future_shared_state_t *)(uintptr_t) Z_LVAL_P(
zend_hash_index_find(Z_ARRVAL(task), TASK_SLOT_STATE));

Expand Down Expand Up @@ -357,7 +370,7 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c
}

/* TASK_KIND_CLOSURE — original PHP-closure path. */
async_thread_snapshot_t *snapshot =
async_thread_snapshot_t * volatile snapshot =
(async_thread_snapshot_t *)(uintptr_t) Z_LVAL_P(
zend_hash_index_find(Z_ARRVAL(task), TASK_SLOT_PAYLOAD_A));
const zval *args_zv =
Expand Down Expand Up @@ -470,8 +483,8 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c
/* Sync mode: run the body as a coroutine in a per-task nursery scope so
* Async\spawn() inside it lands there. Cancel + drain before freeing the
* snapshot so an un-awaited child can't outlive its arena. */
zend_coroutine_t *worker_coro = ZEND_ASYNC_CURRENT_COROUTINE;
zend_async_scope_t *task_scope =
zend_coroutine_t * volatile worker_coro = ZEND_ASYNC_CURRENT_COROUTINE;
zend_async_scope_t * volatile task_scope =
worker_coro != NULL ? ZEND_ASYNC_NEW_SCOPE(ZEND_ASYNC_CURRENT_SCOPE) : NULL;

if (UNEXPECTED(task_scope == NULL)) {
Expand Down Expand Up @@ -516,15 +529,11 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c

/* Await the body; its callback copies result/error into our waker. A
* fatal re-raises zend_bailout() out of the coroutine — caught here. */
bool body_bailed = false;
volatile bool body_bailed = false;
ZEND_ASYNC_WAKER_NEW(worker_coro);
zend_async_resume_when(worker_coro, &body->event, false,
zend_async_waker_callback_resolve, NULL);
zend_try {
ZEND_ASYNC_SUSPEND();
} zend_catch {
body_bailed = true;
} zend_end_try();
body_bailed = thread_pool_suspend_guarded();

/* Decrement running and bump completed BEFORE notifying the awaiter
* via complete/reject — otherwise a coroutine waking from await()
Expand Down Expand Up @@ -699,9 +708,6 @@ static void thread_pool_worker_handler(zend_async_thread_event_t *event, void *c

pefree(wc, 1);
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif

///////////////////////////////////////////////////////////
/// Coroutine-mode task: spawn + extended_dispose
Expand Down
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