From d33a69463f1a75134d01191be0b9e1bdd757dd4b Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期五, 30 四月 2021 15:27:59 +0800
Subject: [PATCH] add atomic queue, no lock, unorder.
---
src/msg.h | 33 ++++++++-------------------------
1 files changed, 8 insertions(+), 25 deletions(-)
diff --git a/src/msg.h b/src/msg.h
index 99b3a09..e332a5d 100644
--- a/src/msg.h
+++ b/src/msg.h
@@ -23,7 +23,6 @@
#include "shm.h"
#include <atomic>
#include <boost/interprocess/offset_ptr.hpp>
-#include <boost/uuid/uuid_generators.hpp>
#include <functional>
#include <stdint.h>
@@ -34,11 +33,10 @@
// 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
-typedef boost::uuids::uuid MQId;
-
-class ShmMsg
+class ShmMsg : private StaticDataRef<SharedMemory, ShmMsg>
{
private:
+ 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
{
@@ -59,20 +57,12 @@
static const Offset base = Addr(shm().get_address()); // cache value.
return base;
}
- static inline SharedMemory &shm()
- {
- if (!pshm()) { throw std::string("Must set ShmMsg shm before use!"); }
- return *pshm();
- }
- static inline SharedMemory *&pshm()
- {
- static SharedMemory *pshm = 0;
- return pshm;
- }
- struct Meta {
+ static const uint32_t kMsgTag = 0xf1e2d3c4;
+ typedef struct {
RefCount count_;
- };
+ const uint32_t tag_ = kMsgTag;
+ } Meta;
Offset offset_;
void *Alloc(const size_t size)
{
@@ -143,21 +133,14 @@
T *get() const { return static_cast<T *>(Ptr(offset_ + BaseAddr())); }
public:
- static bool BindShm(SharedMemory &shm)
- {
- assert(!pshm());
- pshm() = &shm;
- return true;
- }
-
+ static bool BindShm(SharedMemory &shm) { return SetData(shm); }
ShmMsg() :
ShmMsg(nullptr) {}
explicit ShmMsg(const size_t size) :
ShmMsg(Alloc(size)) {}
void swap(ShmMsg &a) { std::swap(offset_, a.offset_); }
- bool valid() const { return static_cast<bool>(offset_); }
+ bool valid() const { return static_cast<bool>(offset_) && meta()->tag_ == kMsgTag; }
- // AddRef and Release works for both counted and not counted msg.
int AddRef() const { return valid() ? meta()->count_.Inc() : 1; }
int Release()
{
--
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