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fix: large message cache may not be recycled with multiple receivers

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mutouyun 2021-06-26 12:46:55 +08:00
parent 130e4d61a6
commit 7bedfbfb5b
4 changed files with 33 additions and 81 deletions
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2
demo/msg_que/main.cpp
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@ -23,7 +23,7 @@ constexpr std::size_t const max_sz = 1024 * 16;
std::atomic<bool> is_quit__{ false }; std::atomic<bool> is_quit__{ false };
std::atomic<std::size_t> size_counter__{ 0 }; std::atomic<std::size_t> size_counter__{ 0 };
using msg_que_t = ipc::chan<ipc::relat::single, ipc::relat::single, ipc::trans::unicast>; using msg_que_t = ipc::chan<ipc::relat::single, ipc::relat::multi, ipc::trans::broadcast>;
msg_que_t que__{ name__ }; msg_que_t que__{ name__ };
ipc::byte_t buff__[max_sz]; ipc::byte_t buff__[max_sz];

104
src/ipc.cpp
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@ -95,7 +95,7 @@ struct chunk_info_t {
ipc::spin_lock lock_; ipc::spin_lock lock_;
IPC_CONSTEXPR_ static std::size_t chunks_elem_size(std::size_t chunk_size) noexcept { IPC_CONSTEXPR_ static std::size_t chunks_elem_size(std::size_t chunk_size) noexcept {
return ipc::make_align(alignof(std::max_align_t), chunk_size + sizeof(acc_t)); return ipc::make_align(alignof(std::max_align_t), chunk_size);
} }
IPC_CONSTEXPR_ static std::size_t chunks_mem_size(std::size_t chunk_size) noexcept { IPC_CONSTEXPR_ static std::size_t chunks_mem_size(std::size_t chunk_size) noexcept {
@ -146,9 +146,7 @@ auto& chunk_storage(std::size_t chunk_size) {
return chunk_storages()[chunk_size]; return chunk_storages()[chunk_size];
} }
std::pair<std::size_t, void*> apply_storage(std::size_t conn_count, std::size_t size) { std::pair<std::size_t, void*> apply_storage(std::size_t size) {
if (conn_count == 0) return {};
std::size_t chunk_size = calc_chunk_size(size); std::size_t chunk_size = calc_chunk_size(size);
auto & chunk_shm = chunk_storage(chunk_size); auto & chunk_shm = chunk_storage(chunk_size);
@ -161,90 +159,48 @@ std::pair<std::size_t, void*> apply_storage(std::size_t conn_count, std::size_t
auto id = info->pool_.acquire(); auto id = info->pool_.acquire();
info->lock_.unlock(); info->lock_.unlock();
auto ptr = info->at(chunk_size, id); return { id, info->at(chunk_size, id) };
if (ptr == nullptr) return {};
reinterpret_cast<acc_t*>(ptr + chunk_size)->store(static_cast<msg_id_t>(conn_count), std::memory_order_release);
return { id, ptr };
} }
void *find_storage(std::size_t id, std::size_t size) { void *find_storage(std::size_t id, std::size_t size) {
if (id == ipc::invalid_value) { if (id == ipc::invalid_value) {
ipc::error("[find_storage] id is invalid: id = %zd, size = %zd\n", id, size); ipc::error("[find_storage] id is invalid: id = %ld, size = %zd\n", (long)id, size);
return nullptr; return nullptr;
} }
std::size_t chunk_size = calc_chunk_size(size); std::size_t chunk_size = calc_chunk_size(size);
auto & chunk_shm = chunk_storage(chunk_size); auto & chunk_shm = chunk_storage(chunk_size);
auto info = chunk_shm.get_info(chunk_size); auto info = chunk_shm.get_info(chunk_size);
if (info == nullptr) return nullptr; if (info == nullptr) return nullptr;
return info->at(chunk_size, id);
auto ptr = info->at(chunk_size, id);
if (ptr == nullptr) return nullptr;
if (reinterpret_cast<acc_t*>(ptr + chunk_size)->load(std::memory_order_acquire) == 0) {
ipc::error("[find_storage] cc test failed: id = %zd, chunk_size = %zd\n", id, chunk_size);
return nullptr;
}
return ptr;
}
void recycle_storage(std::size_t id, std::size_t size) {
if (id == ipc::invalid_value) {
ipc::error("[recycle_storage] id is invalid: id = %zd, size = %zd\n", id, size);
return;
}
std::size_t chunk_size = calc_chunk_size(size);
auto & chunk_shm = chunk_storage(chunk_size);
auto info = chunk_shm.get_info(chunk_size);
if (info == nullptr) return;
auto ptr = info->at(chunk_size, id);
if (ptr == nullptr) {
ipc::error("[recycle_storage] chunk_shm.mems[%zd] failed: chunk_size = %zd\n", id, chunk_size);
return;
}
if (reinterpret_cast<acc_t*>(ptr + chunk_size)->fetch_sub(1, std::memory_order_acq_rel) > 1) {
// not the last receiver, just return
return;
}
info->lock_.lock();
info->pool_.release(id);
info->lock_.unlock();
} }
void clear_storage(std::size_t id, std::size_t size) { void clear_storage(std::size_t id, std::size_t size) {
if (id == ipc::invalid_value) { if (id == ipc::invalid_value) {
ipc::error("[clear_storage] id is invalid: id = %zd, size = %zd\n", id, size); ipc::error("[clear_storage] id is invalid: id = %ld, size = %zd\n", (long)id, size);
return; return;
} }
std::size_t chunk_size = calc_chunk_size(size); std::size_t chunk_size = calc_chunk_size(size);
auto & chunk_shm = chunk_storage(chunk_size); auto & chunk_shm = chunk_storage(chunk_size);
auto info = chunk_shm.get_info(chunk_size); auto info = chunk_shm.get_info(chunk_size);
if (info == nullptr) return; if (info == nullptr) return;
auto ptr = info->at(chunk_size, id);
if (ptr == nullptr) return;
auto cc_flag = reinterpret_cast<acc_t*>(ptr + chunk_size);
for (unsigned k = 0;;) {
auto cc_curr = cc_flag->load(std::memory_order_acquire);
if (cc_curr == 0) return; // means this id has been cleared
if (cc_flag->compare_exchange_weak(cc_curr, 0, std::memory_order_release)) {
break;
}
ipc::yield(k);
}
info->lock_.lock(); info->lock_.lock();
info->pool_.release(id); info->pool_.release(id);
info->lock_.unlock(); info->lock_.unlock();
} }
template <typename MsgT>
bool recycle_message(void* p) {
auto msg = static_cast<MsgT*>(p);
if (msg->storage_) {
clear_storage(
*reinterpret_cast<std::size_t*>(&msg->data_),
static_cast<std::int32_t>(ipc::data_length) + msg->remain_);
}
return true;
}
struct conn_info_head { struct conn_info_head {
ipc::string name_; ipc::string name_;
@ -432,7 +388,7 @@ static bool send(F&& gen_push, ipc::handle_t h, void const * data, std::size_t s
auto msg_id = acc->fetch_add(1, std::memory_order_relaxed); auto msg_id = acc->fetch_add(1, std::memory_order_relaxed);
auto try_push = std::forward<F>(gen_push)(info_of(h), que, msg_id); auto try_push = std::forward<F>(gen_push)(info_of(h), que, msg_id);
if (size > ipc::large_msg_limit) { if (size > ipc::large_msg_limit) {
auto dat = apply_storage(que->conn_count(), size); auto dat = apply_storage(size);
void * buf = dat.second; void * buf = dat.second;
if (buf != nullptr) { if (buf != nullptr) {
std::memcpy(buf, data, size); std::memcpy(buf, data, size);
@ -466,18 +422,14 @@ static bool send(ipc::handle_t h, void const * data, std::size_t size, std::size
return send([tm](auto info, auto que, auto msg_id) { return send([tm](auto info, auto que, auto msg_id) {
return [tm, info, que, msg_id](std::int32_t remain, void const * data, std::size_t size) { return [tm, info, que, msg_id](std::int32_t remain, void const * data, std::size_t size) {
if (!wait_for(info->wt_waiter_, [&] { if (!wait_for(info->wt_waiter_, [&] {
return !que->push(info->cc_id_, msg_id, remain, data, size); return !que->push(
recycle_message<typename queue_t::value_t>,
info->cc_id_, msg_id, remain, data, size);
}, tm)) { }, tm)) {
ipc::log("force_push: msg_id = %zd, remain = %d, size = %zd\n", msg_id, remain, size); ipc::log("force_push: msg_id = %zd, remain = %d, size = %zd\n", msg_id, remain, size);
if (!que->force_push([](void* p) { if (!que->force_push(
auto tmp_msg = static_cast<typename queue_t::value_t*>(p); recycle_message<typename queue_t::value_t>,
if (tmp_msg->storage_) { info->cc_id_, msg_id, remain, data, size)) {
clear_storage(
*reinterpret_cast<std::size_t*>(&tmp_msg->data_),
static_cast<std::int32_t>(ipc::data_length) + tmp_msg->remain_);
}
return true;
}, info->cc_id_, msg_id, remain, data, size)) {
return false; return false;
} }
} }
@ -491,7 +443,9 @@ static bool try_send(ipc::handle_t h, void const * data, std::size_t size, std::
return send([tm](auto info, auto que, auto msg_id) { return send([tm](auto info, auto que, auto msg_id) {
return [tm, info, que, msg_id](std::int32_t remain, void const * data, std::size_t size) { return [tm, info, que, msg_id](std::int32_t remain, void const * data, std::size_t size) {
if (!wait_for(info->wt_waiter_, [&] { if (!wait_for(info->wt_waiter_, [&] {
return !que->push(info->cc_id_, msg_id, remain, data, size); return !que->push(
recycle_message<typename queue_t::value_t>,
info->cc_id_, msg_id, remain, data, size);
}, tm)) { }, tm)) {
return false; return false;
} }
@ -535,9 +489,7 @@ static ipc::buff_t recv(ipc::handle_t h, std::size_t tm) {
std::size_t buf_id = *reinterpret_cast<std::size_t*>(&msg.data_); std::size_t buf_id = *reinterpret_cast<std::size_t*>(&msg.data_);
void * buf = find_storage(buf_id, remain); void * buf = find_storage(buf_id, remain);
if (buf != nullptr) { if (buf != nullptr) {
return ipc::buff_t { buf, remain, [](void* ptr, std::size_t size) { return ipc::buff_t{buf, remain};
recycle_storage(reinterpret_cast<std::size_t>(ptr) - 1, size);
}, reinterpret_cast<void*>(buf_id + 1) };
} }
else ipc::log("fail: shm::handle for big message. msg_id: %zd, buf_id: %zd, size: %zd\n", msg.id_, buf_id, remain); else ipc::log("fail: shm::handle for big message. msg_id: %zd, buf_id: %zd, size: %zd\n", msg.id_, buf_id, remain);
} }

6
src/libipc/queue.h
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@ -155,11 +155,11 @@ public:
return !valid() || (cursor_ == elems_->cursor()); return !valid() || (cursor_ == elems_->cursor());
} }
template <typename T, typename... P> template <typename T, typename F, typename... P>
bool push(P&&... params) { bool push(F&& prep, P&&... params) {
if (elems_ == nullptr) return false; if (elems_ == nullptr) return false;
return elems_->push(this, [&](void* p) { return elems_->push(this, [&](void* p) {
::new (p) T(std::forward<P>(params)...); if (prep(p)) ::new (p) T(std::forward<P>(params)...);
}); });
} }

2
test/test_queue.cpp
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@ -44,7 +44,7 @@ constexpr int ThreadMax = 8;
template <typename Que> template <typename Que>
void push(Que & que, int p, int d) { void push(Que & que, int p, int d) {
for (int n = 0; !que.push(p, d); ++n) { for (int n = 0; !que.push([](void*) { return true; }, p, d); ++n) {
ASSERT_NE(n, PushRetry); ASSERT_NE(n, PushRetry);
std::this_thread::yield(); std::this_thread::yield();
} }