Updated: 2022/Sep/29

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_LWP_WAIT(2)                  System Calls Manual                 _LWP_WAIT(2)

NAME
     _lwp_wait - wait for light-weight process termination

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <lwp.h>

     int
     _lwp_wait(lwpid_t wlwp, lwpid_t *rlwp);

DESCRIPTION
     _lwp_wait() suspends execution of the calling LWP until the LWP specified
     by wlwp terminates.  The specified LWP must not be detached.  If wlwp is
     0, then _lwp_wait() waits for any undetached LWP in the current process.

     If rlwp is not NULL, then it points to the location where the LWP ID of
     the exited LWP is stored.

RETURN VALUES
     The _lwp_wait() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     _lwp_wait() will fail if:

     [ESRCH]            No LWP can be found in the current process
                        corresponding to that specified by wlwp.

     [EDEADLK]          The calling LWP is the only LWP in the process.

     [EDEADLK]          The LWP ID specified by wlwp is the LWP ID of the
                        calling LWP.

     [EINVAL]           The LWP specified by wlwp is detached.

     [EINTR]            _lwp_wait() was interrupted by a caught signal, or the
                        signal did not have the SA_RESTART flag set.

SEE ALSO
     _lwp_create(2), _lwp_exit(2)

HISTORY
     The _lwp_wait() system call first appeared in NetBSD 2.0.

NetBSD 10.99                   December 4, 2022                   NetBSD 10.99