NAME
_lwp_create
- create a new light-weight process
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
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.
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, an error code is returned to indicate the error.
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.
SEE ALSO
_lwp_continue(2),
_lwp_exit(2),
_lwp_wait(2),
_lwp_makecontext(3)
HISTORY
The
_lwp_create(
)
system call first appeared in
NetBSD2.0.