From 58d904a328c0d849769b483e901a0be9426b8209 Mon Sep 17 00:00:00 2001
From: liuxiaolong <liuxiaolong@aiotlink.com>
Date: 星期二, 20 七月 2021 20:20:44 +0800
Subject: [PATCH] 调整Request C.BHFree的位置
---
src/shm.h | 163 ++++++++++++++++++++++++++++++++++--------------------
1 files changed, 103 insertions(+), 60 deletions(-)
diff --git a/src/shm.h b/src/shm.h
index 5e2c8b9..e005cfc 100644
--- a/src/shm.h
+++ b/src/shm.h
@@ -19,89 +19,132 @@
#ifndef SHM_6CHO6D6C
#define SHM_6CHO6D6C
-#include <boost/noncopyable.hpp>
-#include <boost/uuid/uuid.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/sync/interprocess_mutex.hpp>
-#include <boost/interprocess/sync/interprocess_condition.hpp>
-#include <boost/interprocess/sync/scoped_lock.hpp>
+#include <boost/noncopyable.hpp>
+#include <string>
-namespace bhome_shm {
+namespace bhome_shm
+{
using namespace boost::interprocess;
typedef managed_shared_memory mshm_t;
typedef interprocess_mutex Mutex;
typedef scoped_lock<Mutex> Guard;
-typedef interprocess_condition Cond;
class SharedMemory : public mshm_t
{
- std::string name_;
+ std::string name_;
+ Mutex *pmutex_ = 0;
- static permissions AllowAll() {
- permissions perm;
- perm.set_unrestricted();
- return perm;
- }
- void Swap(SharedMemory &a);
+ static permissions AllowAll()
+ {
+ permissions perm;
+ perm.set_unrestricted();
+ return perm;
+ }
+ void Swap(SharedMemory &a);
+
public:
- static bool Remove(const std::string &name) {
- return shared_memory_object::remove(name.c_str());
- }
- SharedMemory(const std::string &name, const uint64_t size);
- ~SharedMemory();
- std::string name() const { return name_; }
- bool Remove() { return Remove(name()); }
+ static bool Remove(const std::string &name) { return shared_memory_object::remove(name.c_str()); }
- void *Alloc(const size_t size) { return allocate(size, std::nothrow); }
- void Dealloc(void *p) { if(p) { deallocate(p); } }
- template<class T> void Dealloc(offset_ptr<T> ptr) { return Dealloc(ptr.get()); }
+ SharedMemory(const std::string &name, const uint64_t size);
+ ~SharedMemory();
+ std::string name() const { return name_; }
+ bool Remove() { return Remove(name()); }
+ template <class T, class... Params>
+ T *FindOrCreate(const std::string &name, Params &&...params)
+ {
+ return find_or_construct<T>(name.c_str(), std::nothrow)(std::forward<decltype(params)>(params)...);
+ }
+ template <class T, class... Params>
+ T *Create(const std::string &name, Params &&...params)
+ {
+ return construct<T>(name.c_str(), std::nothrow)(std::forward<decltype(params)>(params)...);
+ }
+ template <class T>
+ bool Destroy(const std::string &name) { return destroy<T>(name.c_str()); }
- template <class T, class ...Params> T * New(Params const&...params) { return construct<T>(anonymous_instance, std::nothrow)(params...); }
- template <class T> void Delete(T *p) { if (p) { destroy_ptr<T>(p); }; }
- template <class T> void Delete(offset_ptr<T> p) { Delete(p.get()); }
+ void *Alloc(const size_t size)
+ {
+ Guard lock(*pmutex_);
+ return allocate(size, std::nothrow);
+ }
+ void Dealloc(void *p)
+ {
+ Guard lock(*pmutex_);
+ if (p) { deallocate(p); }
+ }
+ template <class T>
+ T *Find(const std::string &name) { return find<T>(name.c_str()).first; }
};
-// ShmObject manages an object in shared memory, but ShmObject itself is not in shared memory.
-// works like a smart pointer of an object in shared memory.
-// TODO handshake with center, and can be removed if killed.
+enum Mode {
+ eOpen = 0,
+ eCreate = 1,
+ eOpenOrCreate = 2
+};
+
+// NamedShmObject manages an object in shared memory, but NamedShmObject itself is not in shared memory.
template <class T>
-class ShmObject : private boost::noncopyable {
- static std::string ObjName(const std::string &name) { return "obj" + name; }
-protected:
- typedef T Data;
- typedef SharedMemory ShmType;
-private:
- ShmType &shm_;
- std::string name_;
- Data *pdata_ = nullptr;
+class NamedShmObject : private boost::noncopyable
+{
+ static std::string ObjName(const std::string &name) { return "obj" + name; }
- bool IsOk() const { return pdata_; }
-protected:
- ShmType &shm() const { return shm_; }
public:
- template <class...Params>
- ShmObject(ShmType &segment, const std::string &name, Params&&...t):
- shm_(segment), name_(name)
- {
- pdata_ = shm_.find_or_construct<Data>(ObjName(name_).c_str(), std::nothrow)(t...);
- if (!IsOk()) {
- throw("Error: Not enough memory, can not allocate \"" + name_ + "\"");
- }
- }
- Data *find(const std::string &name) { return shm_.find<Data>(ObjName(name).c_str()).first; }
- virtual ~ShmObject() {}
- std::string name() const { return name_; }
- Data* data() { return pdata_; }
- const Data* data() const { return pdata_; }
- Data* operator->() { return data(); }
- const Data* operator->() const { return data(); }
- bool Remove() { return shm_.destroy<Data>(ObjName(name_).c_str()); }
-};
+ typedef T Data;
+ typedef SharedMemory ShmType;
+ ShmType &shm() const { return shm_; }
-template <class D> using Allocator = allocator<D, SharedMemory::segment_manager>;
+ template <class... Params>
+ NamedShmObject(ShmType &segment, const std::string &name, Mode mode, Params &&...t) :
+ shm_(segment), name_(name)
+ {
+ switch (mode) {
+ case eOpen:
+ pdata_ = shm_.Find<Data>(ObjName(name_));
+ break;
+ case eCreate:
+ pdata_ = shm_.Create<Data>(ObjName(name_), std::forward<decltype(t)>(t)...);
+ break;
+ case eOpenOrCreate:
+ pdata_ = shm_.FindOrCreate<Data>(ObjName(name_), std::forward<decltype(t)>(t)...);
+ break;
+ default: break;
+ }
+ if (!IsOk()) {
+ throw std::runtime_error("Error: shm can not create/open \"" + name_ + "\"");
+ }
+ }
+
+ NamedShmObject(const int64_t offset, ShmType &segment, const std::string &name) :
+ shm_(segment), name_(name)
+ {
+ pdata_ = reinterpret_cast<Data *>(Addr(shm_.get_address()) + offset);
+ }
+
+ bool IsOk() const { return pdata_; }
+
+ static bool Remove(SharedMemory &shm, const std::string &name) { return shm.Destroy<Data>(ObjName(name)); }
+ static Data *Find(SharedMemory &shm, const std::string &name) { return shm.Find<Data>(ObjName(name)); }
+ Data *Find(const std::string &name) { return Find(shm_, ObjName(name)); }
+ virtual ~NamedShmObject() {}
+ std::string name() const { return name_; }
+ Data *data() { return pdata_; }
+ const Data *data() const { return pdata_; }
+ int64_t offset() const { return Addr(pdata_) - Addr(shm_.get_address()); }
+ Data *operator->() { return data(); }
+ const Data *operator->() const { return data(); }
+ bool Remove() { return Remove(shm_, name_); }
+
+private:
+ static int64_t Addr(const void *p) { return reinterpret_cast<int64_t>(p); }
+ ShmType &shm_;
+ std::string name_;
+ Data *pdata_ = nullptr;
+};
} // namespace bhome_shm
--
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