git-svn-id: svn://db.shs.com.ru/pip@632 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

2018-09-27 10:11:21 +00:00
parent 9b92720b61
commit 08592aae9a
50 changed files with 70 additions and 19 deletions
--- a/src_main/io_devices/pisharedmemory.h
+++ b/src_main/io_devices/pisharedmemory.h
@@ -0,0 +1,93 @@
+/*! \file pisharedmemory.h
+ * \brief Shared memory
+*/
+/*
+    PIP - Platform Independent Primitives
+	Shared Memory
+	Copyright (C) 2018  Ivan Pelipenko peri4ko@yandex.ru
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PISHAREDMEMORY_H
+#define PISHAREDMEMORY_H
+
+#include "piiodevice.h"
+
+
+class PIP_EXPORT PISharedMemory: public PIIODevice
+{
+	PIIODEVICE(PISharedMemory)
+public:
+	
+	explicit PISharedMemory();
+		
+	//! Constructs a shared memory object with name "shm_name", size "size" and open mode "mode"
+	explicit PISharedMemory(const PIString & shm_name, int size, DeviceMode mode = ReadWrite);
+	
+	
+	virtual ~PISharedMemory() {close();}
+	
+	//! Read all shared memory object content to byte array and return it
+	PIByteArray readAll();
+	
+	//! Returns shared memory object size
+	llong size() const;
+
+	//! Set shared memory object size
+	void setSize(llong s);
+	
+	//! Returns if shared memory object is empty
+	bool isEmpty() const {return (size() <= 0);}
+	
+	//! Read from shared memory object to "read_to" no more than "max_size" and return readed bytes count
+	int read(void * read_to, int max_size);
+
+	//! Read from shared memory object to "read_to" no more than "max_size" and return readed bytes count
+	int read(void * read_to, int max_size, int offset);
+	
+	//! Write to shared memory object "data" with size "max_size" and return written bytes count
+	int write(const void * data, int max_size);
+
+	//! Write to shared memory object "data" with size "max_size" and return written bytes count
+	int write(const void * data, int max_size, int offset);
+
+	//! Write "data" to shared memory object
+	int write(const PIByteArray & data) {return write(data.data(), data.size_s());}
+
+	//! Write "data" to shared memory object
+	int write(const PIByteArray & data, int offset) {return write(data.data(), data.size_s(), offset);}
+	
+
+protected:
+	bool openDevice();
+	bool closeDevice();
+	PIString fullPathPrefix() const {return PIStringAscii("shm");}
+	PIString constructFullPathDevice() const;
+	void configureFromFullPathDevice(const PIString & full_path);
+	int readDevice(void * read_to, int max_size) {return read(read_to, max_size, 0);}
+	int writeDevice(const void * data, int max_size) {return write(data, max_size, 0);}
+	DeviceInfoFlags deviceInfoFlags() const {return PIIODevice::Reliable;}
+
+private:
+	void initPrivate();
+
+	int dsize;
+	PRIVATE_DECLARATION
+
+
+};
+
+
+#endif // PISHAREDMEMORY_H