ACE_Errno_Guard Class Reference

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code. More...

#include <OS_Errno.h>

List of all members.

Public Member Functions

 ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref, int error)
 ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref)
 Initialize the errno_ptr_ to the address of errno_ref.
 ~ACE_Errno_Guard (void)
 Reset the value of errno to <error>.
int operator= (int error)
 Assign <error> to <error_>.
bool operator== (int error)
 Compare <error> with <error_> for equality.
bool operator!= (int error)
 Compare <error> with <error_> for inequality.

Private Member Functions

 ACE_Errno_Guard (const ACE_Errno_Guard &)
ACE_Errno_Guardoperator= (const ACE_Errno_Guard &)

Private Attributes

int error_


Detailed Description

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code.

The typical use-case for this is the following: int error = errno; call_some_function_that_might_change_errno (); errno = error; This can be replaced with { ACE_Errno_Guard guard (errno); call_some_function_that_might_change_errno (); } This implementation is more elegant and more efficient since it avoids an unnecessary second access to thread-specific storage by caching a pointer to the value of errno in TSS.


Constructor & Destructor Documentation

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE &  errno_ref,
int  error 
)

Stash the value of error into error_ and initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE &  errno_ref  ) 

Initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard::~ACE_Errno_Guard ( void   ) 

Reset the value of errno to <error>.

ACE_Errno_Guard::ACE_Errno_Guard ( const ACE_Errno_Guard  )  [private]


Member Function Documentation

bool ACE_Errno_Guard::operator!= ( int  error  ) 

Compare <error> with <error_> for inequality.

ACE_Errno_Guard& ACE_Errno_Guard::operator= ( const ACE_Errno_Guard  )  [private]

int ACE_Errno_Guard::operator= ( int  error  ) 

Assign <error> to <error_>.

bool ACE_Errno_Guard::operator== ( int  error  ) 

Compare <error> with <error_> for equality.


Member Data Documentation

int ACE_Errno_Guard::error_ [private]


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

Generated on Tue Apr 14 11:11:21 2009 for ACE by  doxygen 1.5.8