_LWP_EXIT(2) BSD System Calls Manual _LWP_EXIT(2)NAME
_lwp_exit -- terminate the calling light-weight process
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <lwp.h>
void
_lwp_exit(void);
DESCRIPTION
_lwp_exit() terminates the calling LWP. If it is the last LWP in the process, the process exits with a status of 0. If the LWP was not cre-
ated in a detached state, then the system will not reclaim its LWP ID until its status is reported to another LWP in the process via
_lwp_wait(2).
RETURN VALUES
_lwp_exit() can never return.
SEE ALSO _exit(2), _lwp_create(2), _lwp_wait(2)HISTORY
The _lwp_exit() system call first appeared in NetBSD 2.0.
BSD January 13, 2003 BSD
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_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