_lwp_makecontext(3) [netbsd man page]

_LWP_MAKECONTEXT(3)					   BSD Library Functions Manual 				       _LWP_MAKECONTEXT(3)

NAME

     _lwp_makecontext -- create a new initial light-weight process execution context

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <lwp.h>

     void
     _lwp_makecontext(ucontext_t *context, void (*start_routine)(void *), void *arg, void *private, caddr_t stack_base, size_t stack_size);

DESCRIPTION

     _lwp_makecontext() initializes the context structure pointed to by context in a manner suitable for using with _lwp_create(2).  The LWP will
     begin execution at the function specified by start_routine which will be passed a single argument arg.  The LWP private data pointer will be
     set to private.  The stack region for the new LWP is specified by the stack_base and stack_size arguments.

     The signal mask in the context structure is not initialized by _lwp_makecontext().

SEE ALSO

     _lwp_create(2), _lwp_getprivate(2)

HISTORY

     The _lwp_create() system call first appeared in NetBSD 2.0.

BUGS

     The LWP private data pointer is not initialized by the current implementation of _lwp_makecontext().

BSD
								 January 16, 2003							       BSD

_LWP_CREATE(2)						      BSD System Calls Manual						    _LWP_CREATE(2)

NAME

     _lwp_create -- create a new light-weight process

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <lwp.h>

     int
     _lwp_create(ucontext_t *context, unsigned long flags, lwpid_t *new_lwp);

DESCRIPTION

     _lwp_create() causes creation of a new light-weight process, or LWP, and adds it to the current process.  The context argument specifies the
     initial execution context for the new LWP including signal mask, stack, and machine registers.  If this context specifies invalid register
     values (for example priviledge escalation by setting machine dependend bits forbidden for user processes), or does not specify cpu register
     values (uc_flags does not have the _UC_CPU bit set), the call will fail and errno will be set to EINVAL.

     The following flags affect the creation of the new LWP:

     LWP_DETACHED   The LWP is created detached.  The resources associated with a detached LWP will be automatically reclaimed by the system when
		    the LWP exits.  Otherwise, a terminated LWP's resources will not be reclaimed until its status is reported to another LWP via
		    _lwp_wait(2).

     LWP_SUSPENDED  The LWP is created suspended, and will not begin execution until it is resumed by another LWP via _lwp_continue(2).

     The LWP ID of the new LWP is stored in the location pointed to by new_lwp.

RETURN VALUES

     Upon successful completion, _lwp_create() returns a value of 0.  Otherwise, a value of -1 is returned and errno is set to one of the values
     documented below.

ERRORS

     _lwp_create() will fail and no LWP will be created if:

     [EAGAIN]  The system-imposed limit on the total number of LWPs under execution would be exceeded.	This limit is configuration-dependent.

     [ENOMEM]  There is insufficient swap space for the new LWP.

     [EFAULT]  The address pointed to by context or new_lwp is outside the process's allocated address space.

     [EINVAL]  The ucontext_t passed is invalid.

SEE ALSO

     _lwp_continue(2), _lwp_exit(2), _lwp_wait(2), _lwp_makecontext(3)

HISTORY

     The _lwp_create() system call first appeared in NetBSD 2.0.

BSD
								 January 13, 2003							       BSD