From 7ecd6323ffedbfef92c87c02b2a8680dd53b772c Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期四, 06 五月 2021 19:37:50 +0800
Subject: [PATCH] rename atomic queue io function.
---
src/msg.h | 234 +++++++++++++++++++++++++++++++++++++++++++++-------------
1 files changed, 181 insertions(+), 53 deletions(-)
diff --git a/src/msg.h b/src/msg.h
index f3fe726..1f5b0f1 100644
--- a/src/msg.h
+++ b/src/msg.h
@@ -18,68 +18,196 @@
#ifndef MSG_5BILLZET
#define MSG_5BILLZET
-#include <stdint.h>
+#include "bh_util.h"
+#include "proto.h"
#include "shm.h"
+#include <atomic>
#include <boost/interprocess/offset_ptr.hpp>
-#include <boost/uuid/uuid_generators.hpp>
-#include "bhome_msg.pb.h"
+#include <functional>
+#include <stdint.h>
-namespace bhome_msg {
- using namespace bhome_shm;
- using namespace bhome::msg; // for serialized data in MsgI
-
-// MsgI is safe to be stored in shared memory, so POD data or offset_ptr is required.
-// message format: header(meta) + body(data).
-
-typedef boost::uuids::uuid MQId;
-
-// store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object.
-class RefCount : private boost::noncopyable
+namespace bhome_msg
{
-public:
- int Inc() { Guard lk(mutex_); return ++num_; }
- int Dec() { Guard lk(mutex_); return --num_; }
- int Get() { Guard lk(mutex_); return num_; }
+using namespace bhome_shm;
+
+// ShmMsg is safe to be stored in shared memory, so POD data or offset_ptr is required.
+// message content layout: (meta) / header_size + header + data_size + data
+
+class ShmMsg : private StaticDataRef<SharedMemory, ShmMsg>
+{
private:
- Mutex mutex_;
- int num_ = 1;
+ static inline SharedMemory &shm() { return GetData(); }
+ // store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object.
+ class RefCount : private boost::noncopyable
+ {
+ std::atomic<int> num_;
+
+ public:
+ RefCount() :
+ num_(1) { static_assert(std::is_pod<decltype(num_)>::value); }
+ int Inc() { return ++num_; }
+ int Dec() { return --num_; }
+ int Get() { return num_.load(); }
+ };
+ typedef int64_t OffsetType;
+ static OffsetType Addr(void *ptr) { return reinterpret_cast<OffsetType>(ptr); }
+ static void *Ptr(const OffsetType offset) { return reinterpret_cast<void *>(offset); }
+ static inline OffsetType BaseAddr()
+ {
+ static const OffsetType base = Addr(shm().get_address()); // cache value.
+ return base;
+ }
+
+ static const uint32_t kMsgTag = 0xf1e2d3c4;
+ struct Meta {
+ RefCount count_;
+ const uint32_t tag_ = kMsgTag;
+ const uint32_t size_ = 0;
+ Meta(uint32_t size) :
+ size_(size) {}
+ };
+ OffsetType offset_;
+ void *Alloc(const size_t size)
+ {
+ void *p = shm().Alloc(sizeof(Meta) + size);
+ if (p) {
+ auto pmeta = new (p) Meta(size);
+ p = pmeta + 1;
+ }
+ return p;
+ }
+ void Free()
+ {
+ assert(valid());
+ shm().Dealloc(meta());
+ offset_ = 0;
+ assert(!valid());
+ }
+ Meta *meta() const { return get<Meta>() - 1; }
+
+ typedef std::function<void(void *p, int len)> ToArray;
+ void *Pack(const uint32_t head_len, const ToArray &headToArray,
+ const uint32_t body_len, const ToArray &bodyToArray)
+ {
+ void *addr = Alloc(sizeof(head_len) + head_len + sizeof(body_len) + body_len);
+ if (addr) {
+ auto p = static_cast<char *>(addr);
+ auto Pack1 = [&p](auto len, auto &writer) {
+ Put32(p, len);
+ p += sizeof(len);
+ writer(p, len);
+ p += len;
+ };
+ Pack1(head_len, headToArray);
+ Pack1(body_len, bodyToArray);
+ }
+ return addr;
+ }
+
+ template <class Body>
+ void *Pack(const BHMsgHead &head, const Body &body)
+ {
+ return Pack(
+ uint32_t(head.ByteSizeLong()), [&](void *p, int len) { head.SerializeToArray(p, len); },
+ uint32_t(body.ByteSizeLong()), [&](void *p, int len) { body.SerializeToArray(p, len); });
+ }
+
+ void *Pack(const std::string &content)
+ {
+ void *addr = Alloc(content.size());
+ if (addr) {
+ memcpy(addr, content.data(), content.size());
+ }
+ return addr;
+ }
+
+ bool Make(void *addr)
+ {
+ if (!addr) {
+ return false;
+ }
+ ShmMsg(addr).swap(*this);
+ return true;
+ }
+ ShmMsg(void *p) :
+ offset_(p ? (Addr(p) - BaseAddr()) : 0) {}
+
+ template <class T = void>
+ T *get() const { return static_cast<T *>(Ptr(offset_ + BaseAddr())); }
+
+public:
+ static bool BindShm(SharedMemory &shm) { return SetData(shm); }
+ ShmMsg() :
+ ShmMsg(nullptr) {}
+ explicit ShmMsg(const OffsetType offset) :
+ offset_(offset) {}
+ OffsetType Offset() const { return offset_; }
+ OffsetType &OffsetRef() { return offset_; }
+ void swap(ShmMsg &a) { std::swap(offset_, a.offset_); }
+ bool valid() const { return static_cast<bool>(offset_) && meta()->tag_ == kMsgTag; }
+
+ int AddRef() const { return valid() ? meta()->count_.Inc() : 1; }
+ int Release()
+ {
+ if (!valid()) {
+ return 0;
+ }
+ auto n = meta()->count_.Dec();
+ if (n == 0) {
+ Free();
+ }
+ return n;
+ }
+ int Count() const { return valid() ? meta()->count_.Get() : 1; }
+
+ template <class Body>
+ inline bool Make(const BHMsgHead &head, const Body &body) { return Make(Pack(head, body)); }
+ inline bool Make(const std::string &content) { return Make(Pack(content)); }
+ template <class Body>
+ static inline std::string Serialize(const BHMsgHead &head, const Body &body)
+ {
+ uint32_t head_len = head.ByteSizeLong();
+ uint32_t body_len = body.ByteSizeLong();
+ std::string s(4 + head_len + 4 + body_len, '\0');
+ size_t pos = 0;
+ auto add1 = [&](auto &&msg, auto &&size) {
+ Put32(&s[pos], size);
+ pos += 4;
+ msg.SerializeToArray(&s[pos], size);
+ pos += size;
+ };
+ add1(head, head_len);
+ add1(body, body_len);
+ assert(pos == s.size());
+ return s;
+ }
+
+ bool ParseHead(BHMsgHead &head) const
+ {
+ auto p = get<char>();
+ assert(p);
+ uint32_t msg_size = Get32(p);
+ p += 4;
+ return head.ParseFromArray(p, msg_size);
+ }
+ template <class Body>
+ bool ParseBody(Body &body) const
+ {
+ auto p = get<char>();
+ assert(p);
+ uint32_t size = Get32(p);
+ p += 4;
+ p += size;
+ size = Get32(p);
+ p += 4;
+ return body.ParseFromArray(p, size);
+ }
};
-BHMsg MakeRequest(const MQId &src_id, const void *data, const size_t size);
-BHMsg MakeReply(const void *data, const size_t size);
-BHMsg MakeSub(const MQId &client, const std::vector<std::string> &topics);
-BHMsg MakeUnsub(const MQId &client, const std::vector<std::string> &topics);
-BHMsg MakePub(const std::string &topic, const void *data, const size_t size);
+inline void swap(ShmMsg &m1, ShmMsg &m2) { m1.swap(m2); }
-class MsgI {
-private:
- offset_ptr<void> ptr_;
- offset_ptr<RefCount> count_;
-
- bool BuildSubOrUnsub(SharedMemory &shm, const std::vector<std::string> &topics, const MsgType sub_unsub);
-public:
- MsgI(void *p=0, RefCount *c=0):ptr_(p), count_(c) {}
- void swap(MsgI &a) { std::swap(ptr_, a.ptr_); std::swap(count_, a.count_); }
- template <class T = void> T *get() { return static_cast<T*>(ptr_.get()); }
-
- // AddRef and Release works for both counted and not counted msg.
- int AddRef() const { return IsCounted() ? count_->Inc() : 1; }
- int Release(SharedMemory &shm);
-
- int Count() const{ return IsCounted() ? count_->Get() : 1; }
-
- bool IsCounted() const { return static_cast<bool>(count_); }
-
- bool Make(SharedMemory &shm, const BHMsg &msg);
- bool MakeRC(SharedMemory &shm, const BHMsg &msg);
- bool Unpack(BHMsg &msg) const;
-};
-
-inline void swap(MsgI &m1, MsgI &m2) { m1.swap(m2); }
-
+typedef ShmMsg MsgI;
} // namespace bhome_msg
-
-
#endif // end of include guard: MSG_5BILLZET
--
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