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net_instaweb::PthreadSharedMem Class Reference

#include "pthread_shared_mem.h"

Inheritance diagram for net_instaweb::PthreadSharedMem:
net_instaweb::AbstractSharedMem

Public Member Functions

virtual size_t SharedMutexSize () const
 Size of mutexes inside shared memory segments.
 
virtual AbstractSharedMemSegmentCreateSegment (const GoogleString &name, size_t size, MessageHandler *handler)
 
virtual AbstractSharedMemSegmentAttachToSegment (const GoogleString &name, size_t size, MessageHandler *handler)
 
virtual void DestroySegment (const GoogleString &name, MessageHandler *handler)
 
- Public Member Functions inherited from net_instaweb::AbstractSharedMem
virtual bool IsDummy ()
 

Static Public Member Functions

static void Terminate ()
 Frees all lazy-initialized memory used to track shared-memory segments.
 

Detailed Description

POSIX shared memory support, using mmap/pthread_mutexattr_setpshared Supports both processes and threads, but processes that want to access it must be results of just fork (without exec), and all the CreateSegment calls must occur before the fork.

This implementation is also not capable of deallocating segments except at exit, so it should not be used when the set of segments may be dynamic.

Member Function Documentation

virtual AbstractSharedMemSegment* net_instaweb::PthreadSharedMem::AttachToSegment ( const GoogleString name,
size_t  size,
MessageHandler handler 
)
virtual

Attaches to an existing segment, which must have been created already. May return NULL on failure

Implements net_instaweb::AbstractSharedMem.

virtual AbstractSharedMemSegment* net_instaweb::PthreadSharedMem::CreateSegment ( const GoogleString name,
size_t  size,
MessageHandler handler 
)
virtual

This should be called upon main process/thread initialization to create a shared memory segment that will be accessed by other processes/threads as identified by a unique name (via AttachToSegment). It will remove any previous segment with the same name. The memory will be zeroed out.

May return NULL on failure.

Implements net_instaweb::AbstractSharedMem.

virtual void net_instaweb::PthreadSharedMem::DestroySegment ( const GoogleString name,
MessageHandler handler 
)
virtual

Cleans up the segment with given name. You should call this after there is no longer any need for AttachToSegment to succeed.

Implements net_instaweb::AbstractSharedMem.


The documentation for this class was generated from the following file: