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)
	~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 Attributes
int	error_

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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.

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Constructor & Destructor Documentation

ACE_INLINE 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_INLINE ACE_Errno_Guard::ACE_Errno_Guard (  ACE_ERRNO_TYPE &  errno_ref  )

Stash the value of <errno> into <error_> and initialize the <errno_ptr_> to the address of <errno_ref>.

ACE_INLINE ACE_Errno_Guard::~ACE_Errno_Guard (  void   )

Reset the value of <errno> to <error>.

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Member Function Documentation

ACE_INLINE bool ACE_Errno_Guard::operator!= (  int  error  )

Compare <error> with <error_> for inequality.

ACE_INLINE int ACE_Errno_Guard::operator= (  int  error  )

Assign <error> to <error_>.

ACE_INLINE bool ACE_Errno_Guard::operator== (  int  error  )

Compare <error> with <error_> for equality.

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Member Data Documentation

int ACE_Errno_Guard::error_ [private]

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

• OS_Errno.h
• OS_Errno.inl

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