Subversion Repositories or1k_old

/*

FUNCTION

<<__env_lock>>, <<__env_unlock>>--lock environ variable

INDEX

        __env_lock

INDEX

        __env_unlock

ANSI_SYNOPSIS

        #include "envlock.h"

        void __env_lock (void *<[reent]>);

        void __env_unlock (void *<[reent]>);

TRAD_SYNOPSIS

        void __env_lock(<[reent]>)

        char *<[reent]>;

        void __env_unlock(<[reent]>)

        char *<[reent]>;

DESCRIPTION

The <<setenv>> family of routines call these functions when they need

to modify the environ variable.  The version of these routines supplied

in the library does not do anything.  If multiple threads of execution

can call <<setenv>>, or if <<setenv>> can be called reentrantly, then

you need to define your own versions of these functions in order to

safely lock the memory pool during a call.  If you do not, the memory

pool may become corrupted.

A call to <<setenv>> may call <<__env_lock>> recursively; that is,

the sequence of calls may go <<__env_lock>>, <<__env_lock>>,

<<__env_unlock>>, <<__env_unlock>>.  Any implementation of these

routines must be careful to avoid causing a thread to wait for a lock

that it already holds.

*/

void

__env_lock (ptr)

     struct _reent *ptr;

{

}

void

__env_unlock (ptr)

     struct _reent *ptr;

{

}