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makecontext (3)
  • makecontext (3) ( Solaris man: Библиотечные вызовы )
  • >> makecontext (3) ( FreeBSD man: Библиотечные вызовы )
  • makecontext (3) ( Русские man: Библиотечные вызовы )
  • makecontext (3) ( Linux man: Библиотечные вызовы )
  • makecontext (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    makecontext , swapcontext
    
     - modify and exchange user thread contexts
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <ucontext.h>
    void Fo makecontext Fa ucontext_t *ucp Fa void lp]*funcrp]lp]voidrp] Fa int argc ... Fc Ft int swapcontext (ucontext_t *oucp const ucontext_t *ucp);
     

    DESCRIPTION

    The makecontext ();
    function modifies the user thread context pointed to by Fa ucp , which must have previously been initialized by a call to getcontext(3) and had a stack allocated for it. The context is modified so that it will continue execution by invoking func ();
    with the arguments provided. The Fa argc argument must be equal to the number of additional arguments provided to makecontext ();
    and also equal to the number of arguments to func (,);
    or else the behavior is undefined.

    The Fa ucp->uc_link argument must be initialized before calling makecontext ();
    and determines the action to take when func ();
    returns: if equal to NULL the process exits; otherwise, setcontext (ucp->uc_link);
    is implicitly invoked.

    The swapcontext ();
    function saves the current thread context in Fa *oucp and makes Fa *ucp the currently active context.  

    RETURN VALUES

    If successful, swapcontext ();
    returns zero; otherwise -1 is returned and the global variable errno is set appropriately.  

    ERRORS

    The swapcontext ();
    function will fail if:

    Bq Er ENOMEM
    There is not enough stack space in Fa ucp to complete the operation.

     

    SEE ALSO

    setcontext(3), ucontext(3)


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO


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