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.Dd December 4, 2022 .Dt _LWP_WAIT 2 .Os .Sh NAME .Nm _lwp_wait .Nd wait for light-weight process termination .Sh LIBRARY .Lb libc .Sh SYNOPSIS n lwp.h .Ft int .Fn _lwp_wait "lwpid_t wlwp" "lwpid_t *rlwp" .Sh DESCRIPTION .Fn _lwp_wait suspends execution of the calling LWP until the LWP specified by .Fa wlwp terminates. The specified LWP must not be detached. If .Fa wlwp is 0, then .Fn _lwp_wait waits for any undetached LWP in the current process.
p If .Fa rlwp is not .Dv NULL , then it points to the location where the LWP ID of the exited LWP is stored. .Sh RETURN VALUES .Rv -std _lwp_wait .Sh ERRORS .Fn _lwp_wait will fail if: l -tag -width Er t Bq Er ESRCH No LWP can be found in the current process corresponding to that specified by .Fa wlwp . t Bq Er EDEADLK The calling LWP is the only LWP in the process. t Bq Er EDEADLK The LWP ID specified by .Fa wlwp is the LWP ID of the calling LWP. t Bq Er EINVAL The LWP specified by .Fa wlwp is detached. t Bq Er EINTR .Fn _lwp_wait was interrupted by a caught signal, or the signal did not have the .Dv SA_RESTART flag set. .El .Sh SEE ALSO .Xr _lwp_create 2 , .Xr _lwp_exit 2 .Sh HISTORY The .Fn _lwp_wait system call first appeared in .Nx 2.0 .