From 9bf199a4770b08c03d553129757d960b605e598a Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期五, 14 五月 2021 18:05:21 +0800
Subject: [PATCH] add center info at fixed address in shm.
---
src/shm.h | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/src/shm.h b/src/shm.h
index 269df44..b5ec2ea 100644
--- a/src/shm.h
+++ b/src/shm.h
@@ -192,6 +192,12 @@
pdata_ = shm_.Find<Data>(ObjName(name_));
}
}
+ ShmObject(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).c_str()); }
@@ -201,11 +207,13 @@
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;
--
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