FileLock Class Reference

#include <xmipp_filename.h>

Public Member Functions
	FileLock ()
	constructor More...
	FileLock (int fileno)
void	lock (int fileno=0)
	Lock file. More...
void	lock (FILE *file)
void	unlock ()
	Unlock. More...

Protected Attributes
struct flock	fl
bool	islocked
int	filenum

Detailed Description

Lock/unlock files

Definition at line 749 of file xmipp_filename.h.

Constructor & Destructor Documentation

FileLock() [1/2]

FileLock::FileLock ( )

inline

constructor

Definition at line 764 of file xmipp_filename.h.

    {
#ifndef __MINGW32__
        fl.l_type   = F_WRLCK;  /* F_RDLCK, F_WRLCK, F_UNLCK    */
        fl.l_whence = SEEK_SET; /* SEEK_SET, SEEK_CUR, SEEK_END */
        fl.l_start  = 0;        /* Offset from l_whence         */
        fl.l_len    = 0;        /* length, 0 = to EOF           */
        fl.l_pid    = getpid(); /* our PID                      */

        islocked = false;
        filenum = 0;
#endif
    }

FileLock() [2/2]

FileLock::FileLock ( int  fileno )

inline

Definition at line 778 of file xmipp_filename.h.

    {
        FileLock();
        this->filenum = fileno;
    }

Member Function Documentation

lock() [1/2]

void FileLock::lock

(

int

fileno = 0

)

Lock file.

Definition at line 883 of file xmipp_filename.cpp.

{
#ifndef __MINGW32__
    if (islocked)
        unlock();

    if (_fileno != 0)
        filenum = _fileno;

    fl.l_type = F_WRLCK;
    fcntl(filenum, F_SETLKW, &fl);
    islocked = true;
#endif

}

lock() [2/2]

void FileLock::lock

(

FILE *

file

)

Definition at line 899 of file xmipp_filename.cpp.

{
    if (islocked)
        unlock();

    if (hdlFile != NULL)
        this->filenum = fileno(hdlFile);

#ifdef __MINGW32__

    HANDLE hFile = (HANDLE)_get_osfhandle(filenum);
    DWORD dwLastPos = SetFilePointer(hFile, 0, NULL, FILE_END);
    if (LockFile(hFile, 0, 0, dwLastPos, 0) != NULL)
        REPORT_ERROR(ERR_IO_LOCKED,"File cannot be locked.");
#else

    fl.l_type = F_WRLCK;
    fcntl(filenum, F_SETLKW, &fl);
#endif

    islocked = true;
}

unlock()

void FileLock::unlock

(

)

Unlock.

Definition at line 923 of file xmipp_filename.cpp.

{
    if (islocked)
    {
#ifdef __MINGW32__
        HANDLE hFile = (HANDLE)_get_osfhandle(filenum);
        DWORD dwLastPos = SetFilePointer(hFile, 0, NULL, FILE_END);
        if (UnlockFile(hFile, 0, 0, dwLastPos, 0) != NULL)
            REPORT_ERROR(ERR_IO_LOCKED,"File cannot be unlocked.");
#else

        fl.l_type = F_UNLCK;
        fcntl(filenum, F_SETLK, &fl);
#endif

        islocked = false;
    }
}

Member Data Documentation

filenum

int FileLock::filenum

protected

Definition at line 759 of file xmipp_filename.h.

fl

struct flock FileLock::fl

protected

Definition at line 755 of file xmipp_filename.h.

islocked

bool FileLock::islocked

protected

Definition at line 758 of file xmipp_filename.h.

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

• xmippCore/core/xmipp_filename.h
• xmippCore/core/xmipp_filename.cpp