ACE  6.2.8
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
Public Member Functions | Private Member Functions | Private Attributes | List of all members
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>

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. More...
 
 ~ACE_Errno_Guard (void)
 Reset the value of errno to <error>. More...
 
int operator= (int error)
 Assign <error> to <error_>. More...
 
bool operator== (int error)
 Compare <error> with <error_> for equality. More...
 
bool operator!= (int error)
 Compare <error> with <error_> for inequality. More...
 

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 
)
inline

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)
inline

Initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard::~ACE_Errno_Guard ( void  )
inline

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)
inline

Compare <error> with <error_> for inequality.

int ACE_Errno_Guard::operator= ( int  error)
inline

Assign <error> to <error_>.

ACE_Errno_Guard& ACE_Errno_Guard::operator= ( const ACE_Errno_Guard )
private
bool ACE_Errno_Guard::operator== ( int  error)
inline

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: