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resumable.cpp
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// Compiler for PHP (aka KPHP)
// Copyright (c) 2020 LLC «V Kontakte»
// Distributed under the GPL v3 License, see LICENSE.notice.txt
#include "runtime/resumable.h"
#include "common/kprintf.h"
#include "runtime-common/stdlib/tracing/tracing-context.h"
#include "runtime-common/stdlib/tracing/tracing-functions.h"
#include "runtime/kphp_tracing.h"
#include "runtime/net_events.h"
#include "server/php-queries.h"
DEFINE_VERBOSITY(resumable);
bool resumable_finished;
const char *last_wait_error;
static int64_t runned_resumable_id;
static bool in_main_thread() noexcept {
return runned_resumable_id == 0;
}
static void debug_print_resumables() noexcept;
Storage *Resumable::input_;
Storage *Resumable::output_;
static Storage *get_storage(int64_t resumable_id);
bool check_started_storage(Storage *s);
bool check_forked_storage(Storage *s);
static inline void update_current_resumable_id(int64_t new_id, bool is_internal);
bool Resumable::resume(int64_t resumable_id, Storage *input) {
php_assert(!input || check_started_storage(input) || check_forked_storage(input));
int64_t parent_id = runned_resumable_id;
input_ = input;
update_current_resumable_id(resumable_id, is_internal_resumable());
bool res = run();
// must not be used
input_ = nullptr;
update_current_resumable_id(parent_id, is_internal_resumable());
return res;
}
void Resumable::update_output() {
output_ = in_main_thread() ? nullptr : get_storage(runned_resumable_id);
}
int64_t first_forked_resumable_id;
namespace {
struct resumable_info {
Storage output;
Resumable *continuation;
int64_t son;
const char *name;
};
struct forked_resumable_info : resumable_info {
// 0 - default
// 2 * 10^9 > x > 10^8 - waited by x
// 10^8 > x > 0 - in queue x
// -1 - if answer received and not in queue
// x < 0 - (-id) of next finished function in the same queue or -2 if none
int64_t queue_id;
double running_time;
};
struct started_resumable_info : resumable_info {
// x > 0 - has parent x
// 0 - in main thread
// -1 - finished
int64_t parent_id;
int64_t fork_id;
};
int64_t first_array_forked_resumable_id;
int64_t current_forked_resumable_id = 1123456789;
forked_resumable_info *forked_resumables;
forked_resumable_info gotten_forked_resumable_info;
uint32_t forked_resumables_size;
int64_t first_started_resumable_id;
int64_t current_started_resumable_id = 123456789;
started_resumable_info *started_resumables;
uint32_t started_resumables_size;
int64_t first_free_started_resumable_id;
struct wait_queue {
int64_t first_finished_function;
int32_t left_functions;
// 0 - default
// x > 0 - id of wait_queue_next resumable
// x < 0 - next free queue_id
int64_t resumable_id;
};
wait_queue *wait_queues;
uint32_t wait_queues_size;
int64_t wait_next_queue_id;
int64_t *finished_resumables;
uint32_t finished_resumables_size;
uint32_t finished_resumables_count;
int64_t *yielded_resumables;
uint32_t yielded_resumables_l;
uint32_t yielded_resumables_r;
uint32_t yielded_resumables_size;
inline bool is_forked_resumable_id(int64_t resumable_id) {
return first_forked_resumable_id <= resumable_id && resumable_id < current_forked_resumable_id;
}
inline forked_resumable_info *get_forked_resumable_info(int64_t resumable_id) {
php_assert(is_forked_resumable_id(resumable_id));
if (resumable_id < first_array_forked_resumable_id) {
return &gotten_forked_resumable_info;
}
return &forked_resumables[resumable_id - first_array_forked_resumable_id];
}
inline bool is_started_resumable_id(int64_t resumable_id) {
return first_started_resumable_id <= resumable_id && resumable_id < current_started_resumable_id;
}
inline started_resumable_info *get_started_resumable_info(int64_t resumable_id) {
php_assert(is_started_resumable_id(resumable_id));
return &started_resumables[resumable_id - first_started_resumable_id];
}
inline bool is_wait_queue_id(int64_t queue_id) {
return 0 < queue_id && queue_id <= wait_next_queue_id && wait_queues[queue_id - 1].resumable_id >= 0;
}
inline wait_queue *get_wait_queue(int64_t queue_id) {
php_assert(is_wait_queue_id(queue_id));
return &wait_queues[queue_id - 1];
}
Storage *get_started_storage(int64_t resumable_id) noexcept {
return &get_started_resumable_info(resumable_id)->output;
}
} // namespace
Storage *get_forked_storage(int64_t resumable_id) {
return &get_forked_resumable_info(resumable_id)->output;
}
bool check_started_storage(Storage *storage) {
return static_cast<void *>(started_resumables) <= static_cast<void *>(storage) &&
static_cast<void *>(storage) < static_cast<void *>(started_resumables + started_resumables_size);
}
bool check_forked_storage(Storage *storage) {
return static_cast<void *>(forked_resumables) <= static_cast<void *>(storage) &&
static_cast<void *>(storage) < static_cast<void *>(forked_resumables + forked_resumables_size);
}
static Storage *get_storage(int64_t resumable_id) {
if (resumable_id > 1000000000) {
return get_forked_storage(resumable_id);
} else {
return get_started_storage(resumable_id);
}
}
int64_t register_forked_resumable(Resumable *resumable) {
if (current_forked_resumable_id == first_array_forked_resumable_id + forked_resumables_size) {
uint32_t first_needed_id = 0;
while (first_needed_id < forked_resumables_size &&
forked_resumables[first_needed_id].queue_id == -1 &&
forked_resumables[first_needed_id].output.tag == 0) {
first_needed_id++;
}
if (first_needed_id > forked_resumables_size / 2) {
memcpy(forked_resumables, forked_resumables + first_needed_id, sizeof(forked_resumable_info) * (forked_resumables_size - first_needed_id));
first_array_forked_resumable_id += first_needed_id;
} else {
forked_resumables = static_cast<forked_resumable_info *>(dl::reallocate(forked_resumables, sizeof(forked_resumable_info) * 2 * forked_resumables_size, sizeof(forked_resumable_info) * forked_resumables_size));
forked_resumables_size *= 2;
}
Resumable::update_output();
}
if (current_forked_resumable_id >= 2000000000) {
php_critical_error("too many forked resumables");
}
int64_t res_id = current_forked_resumable_id++;
forked_resumable_info *res = get_forked_resumable_info(res_id);
new(&res->output) Storage();
res->continuation = resumable;
res->queue_id = 0;
res->son = 0;
res->running_time = 0;
res->name = resumable ? typeid(*resumable).name() : "(null)";
return res_id;
}
static inline void update_current_resumable_id(int64_t new_id, bool is_internal) {
int64_t old_running_fork = f$get_running_fork_id();
runned_resumable_id = new_id;
int64_t new_running_fork = f$get_running_fork_id();
if (new_running_fork != old_running_fork) {
update_precise_now();
if (old_running_fork) {
get_forked_resumable_info(old_running_fork)->running_time += get_precise_now();
}
if (new_running_fork) {
get_forked_resumable_info(new_running_fork)->running_time -= get_precise_now();
}
if (!is_internal && kphp_tracing::is_turned_on()) {
kphp_tracing::on_fork_switch(new_running_fork);
}
}
Resumable::update_output();
}
int64_t f$get_running_fork_id() {
if (in_main_thread()) {
return 0;
}
if (is_forked_resumable_id(runned_resumable_id)) {
return runned_resumable_id;
}
if (is_started_resumable_id(runned_resumable_id)) {
return get_started_resumable_info(runned_resumable_id)->fork_id;
}
php_assert (false);
return 0;
}
Optional<array<mixed>> f$get_fork_stat(int64_t fork_id) {
auto *info = get_forked_resumable_info(fork_id);
if (!info) {
return false;
}
if (info->queue_id == -1 && info->output.tag == 0) {
return false;
}
array<mixed> result;
result.set_value(string("id"), fork_id);
result.set_value(string("name"), string(info->name));
if (info->queue_id < 0) {
result.set_value(string("state"), string("finished"));
} else if (fork_id == f$get_running_fork_id()){
result.set_value(string("state"), string("running"));
} else {
result.set_value(string("state"), string("blocked"));
}
double running_time = info->running_time;
if (fork_id == f$get_running_fork_id()) {
running_time += get_precise_now();
}
result.set_value(string("work_time"), running_time);
return result;
}
static int64_t register_started_resumable(Resumable *resumable) noexcept {
int64_t res_id;
bool is_new = false;
if (first_free_started_resumable_id) {
res_id = first_free_started_resumable_id;
first_free_started_resumable_id = get_started_resumable_info(first_free_started_resumable_id)->parent_id;
} else {
if (current_started_resumable_id == first_started_resumable_id + started_resumables_size) {
started_resumables = static_cast<started_resumable_info *>(dl::reallocate(started_resumables, sizeof(started_resumable_info) * 2 * started_resumables_size, sizeof(started_resumable_info) * started_resumables_size));
started_resumables_size *= 2;
}
res_id = current_started_resumable_id++;
is_new = true;
Resumable::update_output();
}
if (res_id >= 1000000000) {
php_critical_error("too many started resumables");
}
started_resumable_info *res = get_started_resumable_info(res_id);
php_assert(is_new || res->output.tag == 0);
new(&res->output) Storage();
res->continuation = resumable;
res->parent_id = runned_resumable_id;
res->fork_id = f$get_running_fork_id();
res->son = 0;
res->name = resumable ? typeid(*resumable).name() : "(null)";
if (!in_main_thread()) {
auto *parent = is_started_resumable_id(runned_resumable_id)
? static_cast<resumable_info *>(get_started_resumable_info(runned_resumable_id))
: static_cast<resumable_info *>(get_forked_resumable_info(runned_resumable_id));
if (parent->son != 0) {
kprintf("Tring to change %" PRIi64 "->son from %" PRIi64 " to %" PRIi64 "\n", runned_resumable_id, parent->son, res_id);
debug_print_resumables();
php_assert(parent->son == 0);
}
parent->son = res_id;
}
return res_id;
}
Resumable *get_forked_resumable(int64_t resumable_id) {
return get_forked_resumable_info(resumable_id)->continuation;
}
Resumable *get_started_resumable(int64_t resumable_id) {
return get_started_resumable_info(resumable_id)->continuation;
}
static void add_resumable_to_queue(int64_t resumable_id, forked_resumable_info *resumable) {
int64_t queue_id = resumable->queue_id;
wait_queue *q = get_wait_queue(queue_id);
tvkprintf(resumable, 2, "Push resumable %" PRIi64 " to queue %" PRIi64 "(%" PRIi64 ", %" PRIi64 ", %" PRIi32 ") at %.6lf\n",
resumable_id, resumable->queue_id, q->resumable_id, q->first_finished_function, q->left_functions, (update_precise_now(), get_precise_now()));
resumable->queue_id = q->first_finished_function;
q->first_finished_function = -resumable_id;
if (q->resumable_id) {
resumable_run_ready(q->resumable_id);
q = get_wait_queue(queue_id); // can be reallocated in run_ready
}
q->left_functions--;
}
static void free_resumable_continuation(resumable_info *res) noexcept {
php_assert(res->continuation);
delete res->continuation;
res->continuation = nullptr;
}
static void finish_forked_resumable(int64_t resumable_id) noexcept {
forked_resumable_info *res = get_forked_resumable_info(resumable_id);
bool is_internal = res->continuation->is_internal_resumable();
free_resumable_continuation(res);
if (!is_internal && kphp_tracing::is_turned_on()) {
kphp_tracing::on_fork_finish(resumable_id);
}
if (res->queue_id > 100000000) {
php_assert(is_started_resumable_id(res->queue_id));
int64_t wait_resumable_id = res->queue_id;
res->queue_id = -1;
resumable_run_ready(wait_resumable_id);
} else if (res->queue_id > 0) {
add_resumable_to_queue(resumable_id, res);
} else {
res->queue_id = -1;
}
php_assert(get_forked_resumable_info(resumable_id)->queue_id < 0);
}
static void finish_started_resumable(int64_t resumable_id) {
started_resumable_info *res = get_started_resumable_info(resumable_id);
free_resumable_continuation(res);
}
void unregister_started_resumable_debug_hack(int64_t resumable_id) {
started_resumable_info *res = get_started_resumable_info(resumable_id);
php_assert(res->continuation == nullptr);
res->parent_id = first_free_started_resumable_id;
first_free_started_resumable_id = resumable_id;
}
static void unregister_started_resumable(int64_t resumable_id) noexcept {
started_resumable_info *res = get_started_resumable_info(resumable_id);
if (res->parent_id > 0) {
auto *parent = is_started_resumable_id(res->parent_id)
? static_cast<resumable_info *>(get_started_resumable_info(res->parent_id))
: static_cast<resumable_info *>(get_forked_resumable_info(res->parent_id));
if (parent->son != resumable_id && parent->son != 0) {
kprintf("Tring to change %" PRIi64 "->son from %" PRIi64 " to %d\n", res->parent_id, resumable_id, 0);
debug_print_resumables();
php_assert(parent->son == resumable_id || parent->son == 0);
}
parent->son = 0;
}
php_assert(res->continuation == nullptr);
res->parent_id = first_free_started_resumable_id;
first_free_started_resumable_id = resumable_id;
}
static bool resumable_has_finished() {
return finished_resumables_count > 0 || yielded_resumables_l != yielded_resumables_r;
}
static void yielded_resumables_push(int64_t id) {
yielded_resumables[yielded_resumables_r] = id;
yielded_resumables_r++;
if (yielded_resumables_r == yielded_resumables_size) {
yielded_resumables_r = 0;
}
if (yielded_resumables_r == yielded_resumables_l) {
yielded_resumables = static_cast<int64_t *>(dl::reallocate(yielded_resumables, sizeof(int64_t) * 2 * yielded_resumables_size, sizeof(int64_t) * yielded_resumables_size));
memcpy(yielded_resumables + yielded_resumables_size, yielded_resumables, sizeof(int64_t) * yielded_resumables_r);
yielded_resumables_r += yielded_resumables_size;
yielded_resumables_size *= 2;
}
}
static int64_t yielded_resumables_pop() {
php_assert(yielded_resumables_l != yielded_resumables_r);
int64_t result = yielded_resumables[yielded_resumables_l];
yielded_resumables_l++;
if (yielded_resumables_l == yielded_resumables_size) {
yielded_resumables_l = 0;
}
return result;
}
static void resumable_add_finished(int64_t resumable_id) {
php_assert(is_started_resumable_id(resumable_id));
if (finished_resumables_count >= finished_resumables_size) {
php_assert(finished_resumables_count == finished_resumables_size);
finished_resumables = static_cast<int64_t *>(
dl::reallocate(finished_resumables,
sizeof(int64_t) * 2 * finished_resumables_size,
sizeof(int64_t) * finished_resumables_size));
finished_resumables_size *= 2;
}
tvkprintf(resumable, 3, "Resumable %" PRIi64 " put to position %" PRIu32 " of finished list\n", resumable_id, finished_resumables_count);
finished_resumables[finished_resumables_count++] = resumable_id;
}
static void resumable_get_finished(int64_t *resumable_id, bool *is_yielded) {
php_assert(resumable_has_finished());
if (finished_resumables_count) {
*resumable_id = finished_resumables[--finished_resumables_count];
*is_yielded = false;
} else {
*resumable_id = yielded_resumables_pop();
*is_yielded = true;
}
}
static void debug_print_resumables() noexcept {
fprintf(stderr, "first free resumable id: %" PRIi64 "\n", first_free_started_resumable_id);
fprintf(stderr, "finished:");
for (uint32_t i = 0; i < finished_resumables_count; i++) {
fprintf(stderr, " %" PRIi64, finished_resumables[i]);
}
fprintf(stderr, "\n");
for (int64_t i = first_started_resumable_id; i < current_started_resumable_id; i++) {
started_resumable_info *info = get_started_resumable_info(i);
fprintf(stderr, "started id = %" PRIi64 ", parent = %" PRIi64 ", fork = %" PRIi64 ", son = %" PRIi64 ", continuation = %s, name = %s\n", i, info->parent_id, info->fork_id, info->son,
info->continuation ? typeid(*info->continuation).name() : "(none)", info->name ? info->name : "()");
}
for (int64_t i = first_forked_resumable_id; i < current_forked_resumable_id; i++) {
forked_resumable_info *info = get_forked_resumable_info(i);
fprintf(stderr, "forked id = %" PRIi64 ", queue_id = %" PRIi64 ", son = %" PRIi64 ", continuation = %s, name = %s\n", i, info->queue_id, info->son,
info->continuation ? typeid(*info->continuation).name() : "(none)", info->name ? info->name : "()");
}
}
static bool wait_started_resumable(int64_t resumable_id) noexcept;
Storage *start_resumable_impl(Resumable *resumable) noexcept {
check_script_timeout();
int64_t id = register_started_resumable(resumable);
if (resumable->resume(id, nullptr)) {
Storage *output = get_started_storage(id);
finish_started_resumable(id);
unregister_started_resumable(id);
resumable_finished = true;
return output;
}
if (in_main_thread()) {
php_assert (wait_started_resumable(id));
Storage *output = get_started_storage(id);
resumable_finished = true;
unregister_started_resumable(id);
return output;
}
resumable_finished = false;
return nullptr;
}
int64_t fork_resumable(Resumable *resumable) noexcept {
int64_t id = register_forked_resumable(resumable);
if (kphp_tracing::is_turned_on()) {
kphp_tracing::on_fork_start(id);
if (unlikely(kphp_tracing::TracingContext::get().cur_trace_level >= 2)) {
kphp_tracing::on_fork_provide_name(id, string{typeid(*resumable).name()});
}
}
if (resumable->resume(id, nullptr)) {
finish_forked_resumable(id);
}
return id;
}
static void continue_resumable(resumable_info *res, int64_t resumable_id) noexcept {
if (unlikely(res->son)) {
debug_print_resumables();
php_assert(res->son == 0);
}
const bool is_done = res->continuation->resume(resumable_id, nullptr);
php_assert(is_done);
}
void resumable_run_ready(int64_t resumable_id) {
tvkprintf(resumable, 2, "Run ready resumable %" PRIi64 "\n", resumable_id);
if (resumable_id > 1000000000) {
forked_resumable_info *res = get_forked_resumable_info(resumable_id);
php_assert(res->queue_id >= 0);
continue_resumable(res, resumable_id);
finish_forked_resumable(resumable_id);
} else {
started_resumable_info *res = get_started_resumable_info(resumable_id);
continue_resumable(res, resumable_id);
finish_started_resumable(resumable_id);
resumable_add_finished(resumable_id);
}
}
#if defined(__APPLE__)
void run_scheduler(double timeout);
#else
void run_scheduler(double timeout) __attribute__((section("run_scheduler_section")));
#endif
static int64_t scheduled_resumable_id = 0;
void run_scheduler(double dead_line_time) {
tvkprintf(resumable, 2, "Run scheduler with finished resumables count %" PRIu32 "\n", finished_resumables_count);
int32_t left_resumables = 1000;
bool force_run_next = false;
while (resumable_has_finished() && --left_resumables >= 0) {
if (force_run_next) {
force_run_next = false;
} else if (get_precise_now() > dead_line_time) {
return;
}
int64_t resumable_id;
bool is_yielded;
resumable_get_finished(&resumable_id, &is_yielded);
if (is_yielded) {
left_resumables = 0;
}
started_resumable_info *res = get_started_resumable_info(resumable_id);
php_assert(res->continuation == nullptr);
tvkprintf(resumable, 3, "Process %" PRIi64 "(%s) with parent %" PRIi64 " in scheduler\n",
resumable_id, is_yielded ? "yielded" : "not yielded", res->parent_id);
int64_t parent_id = res->parent_id;
if (parent_id == 0) {
res->parent_id = -1;
return;
}
php_assert(parent_id > 0);
scheduled_resumable_id = parent_id;
if (parent_id < 1000000000) {
started_resumable_info *parent = get_started_resumable_info(parent_id);
if (parent->continuation == nullptr || parent->son != resumable_id) {
kprintf("Will fail assert with resumbale_id = %" PRIi64 "\n", resumable_id);
debug_print_resumables();
}
php_assert(parent->son == resumable_id);
php_assert(parent->continuation != nullptr);
php_assert(parent->parent_id != -2);
parent->son = 0;
if (parent->continuation->resume(parent_id, &res->output)) {
finish_started_resumable(parent_id);
resumable_add_finished(parent_id);
left_resumables++;
force_run_next = true;
}
} else {
forked_resumable_info *parent = get_forked_resumable_info(parent_id);
if (parent->continuation == nullptr || parent->son != resumable_id) {
kprintf("Will fail assert with resumbale_id = %" PRIi64 "\n", resumable_id);
debug_print_resumables();
}
php_assert(parent->son == resumable_id);
php_assert(parent->continuation != nullptr);
php_assert(parent->queue_id >= 0);
parent->son = 0;
if (parent->continuation->resume(parent_id, &res->output)) {
finish_forked_resumable(parent_id);
}
}
scheduled_resumable_id = 0;
unregister_started_resumable_debug_hack(resumable_id);
}
}
void wait_without_result_synchronously(int64_t resumable_id) {
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
if (resumable->queue_id < 0) {
return;
}
update_precise_now();
while (wait_net(MAX_TIMEOUT_MS) && resumable->queue_id >= 0) {
update_precise_now();
}
}
bool wait_without_result_synchronously_safe(int64_t resumable_id) {
last_wait_error = nullptr;
if (!is_forked_resumable_id(resumable_id)) {
last_wait_error = "Wrong resumable id";
return false;
}
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
if (resumable->queue_id < 0) {
return true;
}
if (resumable->queue_id > 0) {
last_wait_error = "Someone already waits for this resumable";
return false;
}
wait_without_result_synchronously(resumable_id);
return true;
}
static bool wait_forked_resumable(int64_t resumable_id, double dead_line_time) {
php_assert(dead_line_time > get_precise_now()); // TODO remove asserts
php_assert(in_main_thread()); // TODO remove asserts
php_assert(is_forked_resumable_id(resumable_id));
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
do {
if (resumable->queue_id < 0) {
return true;
}
run_scheduler(dead_line_time);
resumable = get_forked_resumable_info(resumable_id);//can change in scheduler
if (resumable->queue_id < 0) {
return true;
}
if (get_precise_now() > dead_line_time) {
return false;
}
update_precise_now();
if (resumable_has_finished()) {
wait_net(0);
continue;
}
} while (resumable_has_finished() || wait_net(timeout_convert_to_ms(dead_line_time - get_precise_now())));
return false;
}
static bool wait_started_resumable(int64_t resumable_id) noexcept {
php_assert(in_main_thread()); // TODO remove asserts
php_assert(is_started_resumable_id(resumable_id));
started_resumable_info *resumable = get_started_resumable_info(resumable_id);
do {
php_assert(resumable->parent_id == 0);
run_scheduler(get_precise_now() + MAX_TIMEOUT);
// can change in scheduler
resumable = get_started_resumable_info(resumable_id);
if (resumable->parent_id == -1) {
return true;
}
update_precise_now();
if (resumable_has_finished()) {
wait_net(0);
continue;
}
} while (resumable_has_finished() || wait_net(MAX_TIMEOUT_MS));
return false;
}
class ResumableWithTimer : public Resumable {
protected:
void set_timer(double timeout, int32_t wakeup_callback_id, int64_t wakeup_extra) noexcept {
php_assert(static_cast<int32_t>(wakeup_extra) == wakeup_extra);
timer_ = allocate_event_timer(timeout, wakeup_callback_id, static_cast<int32_t>(wakeup_extra));
}
void remove_timer() noexcept {
if (timer_) {
remove_event_timer(timer_);
timer_ = nullptr;
}
}
private:
kphp_event_timer *timer_{nullptr};
};
static int32_t wait_timeout_wakeup_id = -1;
class wait_resumable final : public ResumableWithTimer {
public:
bool is_internal_resumable() const noexcept final {
return true;
}
explicit wait_resumable(int64_t child_id) noexcept:
child_id_(child_id) {
}
void set_timer(double timeout, int64_t wakeup_extra) noexcept {
ResumableWithTimer::set_timer(timeout, wait_timeout_wakeup_id, wakeup_extra);
}
private:
bool run() final {
remove_timer();
forked_resumable_info *info = get_forked_resumable_info(child_id_);
if (info->queue_id < 0) {
output_->save<bool>(true);
} else {
php_assert(input_ == nullptr);
info->queue_id = 0;
output_->save<bool>(false);
}
child_id_ = -1;
return true;
}
int64_t child_id_;
};
class wait_concurrently_resumable final : public Resumable {
public:
explicit wait_concurrently_resumable(int64_t child_id) noexcept:
child_id_(child_id) {
}
private:
bool run() final {
RESUMABLE_BEGIN
while (true) {
info_ = get_forked_resumable_info(child_id_);
if (info_->queue_id < 0) {
break;
}
if (!resumable_has_finished()) {
wait_net(MAX_TIMEOUT);
}
f$sched_yield();
TRY_WAIT_DROP_RESULT(wait_many_resumable_label1, void);
}
output_->save<bool>(true);
child_id_ = -1;
return true;
RESUMABLE_END
}
int64_t child_id_;
forked_resumable_info *info_{nullptr};
};
static void process_wait_timeout(kphp_event_timer *timer) {
int64_t wait_resumable_id = timer->wakeup_extra;
php_assert(is_started_resumable_id(wait_resumable_id));
resumable_run_ready(wait_resumable_id);
}
bool wait_without_result(int64_t resumable_id, double timeout) {
resumable_finished = true;
last_wait_error = nullptr;
if (!is_forked_resumable_id(resumable_id)) {
last_wait_error = "Wrong resumable id";
return false;
}
bool has_timeout = true;
if (timeout < 0 || timeout > MAX_TIMEOUT) {
has_timeout = false;
timeout = MAX_TIMEOUT;
} else {
update_precise_now();
}
if (timeout != 0.0) {
timeout += get_precise_now();
} else {
wait_net(0);
}
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
if (resumable->queue_id < 0) {
return true;
}
if (resumable->queue_id > 0) {
int waiter_id = resumable->queue_id;
Resumable *waiter_fork = nullptr;
Resumable *waiter_resumable = nullptr;
int fork_id = -1;
if (is_started_resumable_id(waiter_id)) {
auto *info = get_started_resumable_info(waiter_id);
waiter_resumable = info->continuation;
fork_id = info->fork_id;
if (fork_id != 0) {
waiter_fork = get_forked_resumable_info(fork_id)->continuation;
}
}
php_warning("Resumable is already waited by other thread: waiter=%d(%s), fork=%d(%s), running_resumable_id=%d",
waiter_id, waiter_resumable ? typeid(*waiter_resumable).name() : "null", fork_id, waiter_fork ? typeid(*waiter_fork).name() : "null",
static_cast<int>(runned_resumable_id));
last_wait_error = "Someone already waits for this resumable";
return false;
}
if (timeout == 0.0) {
last_wait_error = "Zero timeout in wait";
return false;
}
if (in_main_thread()) {
if (!wait_forked_resumable(resumable_id, timeout)) {
last_wait_error = "Timeout in wait";
return false;
}
return true;
}
wait_resumable *res = new wait_resumable(resumable_id);
resumable->queue_id = register_started_resumable(res);
if (has_timeout) {
res->set_timer(timeout, resumable->queue_id);
}
resumable_finished = false;
return false;
}
bool f$wait_concurrently(int64_t resumable_id) {
resumable_finished = true;
last_wait_error = nullptr;
if (!is_forked_resumable_id(resumable_id)) {
last_wait_error = "Wrong resumable id";
return false;
}
wait_net(0);
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
if (resumable->queue_id < 0) {
return true;
}
if (resumable->queue_id > 0) {
return start_resumable<bool>(new wait_concurrently_resumable(resumable_id));
}
return wait_without_result(resumable_id);
}
static int64_t wait_queue_push(int64_t queue_id, int64_t resumable_id) {
if (!is_forked_resumable_id(resumable_id)) {
php_warning("Wrong resumable_id %" PRIi64 " in function wait_queue_push", resumable_id);
return queue_id;
}
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
if (resumable->queue_id != 0 && resumable->queue_id != -1) {
php_warning("Someone already waits resumable %" PRIi64, resumable_id);
return queue_id;
}
if (resumable->queue_id < 0 && resumable->output.tag == 0) {
return queue_id;
}
if (queue_id == -1) {
queue_id = f$wait_queue_create();
} else if (!is_wait_queue_id(queue_id)) {
php_warning("Wrong queue_id %" PRIi64, queue_id);
return queue_id;
}
wait_queue *q = get_wait_queue(queue_id);
if (resumable->queue_id == 0) {
resumable->queue_id = queue_id;
tvkprintf(resumable, 3, "Link resumable %" PRIi64 " with queue %" PRIi64 " at %.6lf\n",
resumable_id, queue_id, (update_precise_now(), get_precise_now()));
q->left_functions++;
} else {
resumable->queue_id = q->first_finished_function;
q->first_finished_function = -resumable_id;
}
return queue_id;
}
int64_t wait_queue_push_unsafe(int64_t queue_id, int64_t resumable_id) {
if (queue_id == -1) {
queue_id = f$wait_queue_create();
}
forked_resumable_info *resumable = get_forked_resumable_info(resumable_id);
wait_queue *q = get_wait_queue(queue_id);
if (resumable->queue_id == 0) {
resumable->queue_id = queue_id;
q->left_functions++;
} else {
resumable->queue_id = q->first_finished_function;
q->first_finished_function = -resumable_id;
}
return queue_id;
}
static int64_t first_free_queue_id;
void unregister_wait_queue(int64_t queue_id) {
if (queue_id != -1) {
get_wait_queue(queue_id)->resumable_id = -first_free_queue_id - 1;
first_free_queue_id = queue_id;
}
}
int64_t f$wait_queue_create() {
int64_t res_id;
if (first_free_queue_id != 0) {
res_id = first_free_queue_id;
first_free_queue_id = -wait_queues[res_id - 1].resumable_id - 1;
php_assert(0 <= first_free_queue_id && first_free_queue_id <= wait_next_queue_id);
} else {
if (wait_next_queue_id >= wait_queues_size) {
php_assert(wait_next_queue_id == wait_queues_size);
wait_queues = static_cast<wait_queue *>(dl::reallocate(wait_queues, sizeof(wait_queue) * 2 * wait_queues_size, sizeof(wait_queue) * wait_queues_size));
wait_queues_size *= 2;
}
res_id = ++wait_next_queue_id;
}
if (wait_next_queue_id >= 99999999) {
php_critical_error("too many wait queues");
}
wait_queue *q = &wait_queues[res_id - 1];
q->first_finished_function = -2;
q->left_functions = 0;
q->resumable_id = 0;