DqmSharedMem Class Reference

Public Member Functions
	DqmSharedMem (const char *name, int size)
	DqmSharedMem (int shm_id, int sem_id, int size)
	~DqmSharedMem (void)
void *	ptr (void)
int	shmid (void)
bool	IsCreated (void)
void	lock (void)
void	unlock (void)
bool	isLocked (void)

Static Public Member Functions
static std::string	getTmpFileName (std::string user, std::string name)
static bool	getIdFromTmpFileName (std::string filename, int &shmid, int &semid)

Private Attributes
bool	m_new {false}
	True if we created the ring buffer ourselves (and need to clean it).
int	m_pathfd
key_t	m_shmkey
	Associated file descriptor. More...
key_t	m_semkey
	Semaphore key.
int	m_shmid {-1}
	shared memory id
int	m_semid {-1}
	semaphore id
void *	m_shmadr {nullptr}

Detailed Description

Definition at line 19 of file DqmSharedMem.h.

Constructor & Destructor Documentation

~DqmSharedMem()

~DqmSharedMem

(

void

)

this killed the shared mems if the b2hlt... utils are run, thus commented!

Definition at line 125 of file DqmSharedMem.cc.

{
 
  //shmdt((const void*) m_shmadr);
  //shmctl(m_shmid, IPC_RMID, NULL);
  //printf("DqmSharedMem: destructor called for ID %d\n", m_shmid);
  // TODO: problem, neither semaphore nor tmp file are deleted if they exist
  // TODO: there is no guarantee that the destructor is called (e.g. on exit(), crash)
  // printf("DqmSharedMem: destructor called for %s\n", m_strbuf);
}

Member Data Documentation

m_shmkey

key_t m_shmkey

private

Associated file descriptor.

SHM key, see shmget(2).

Definition at line 40 of file DqmSharedMem.h.

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

• daq/dqm/include/DqmSharedMem.h
• daq/dqm/src/DqmSharedMem.cc