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Full Discussion: Pthread attr setting doesn't work before thread create?
Top Forums UNIX for Advanced & Expert Users Pthread attr setting doesn't work before thread create? Post 302525081 by DGPickett on Wednesday 25th of May 2011 04:03:44 PM
Old 05-25-2011
If the threads of one LWP had different scheduler priorities, on a N-M schedulet, does nice change values as threads are given the LWP? Process nice variations are not so good for handling this. I guess the LWP would need to stay at the max nice of any thread so as to prevent a low nice thread getting the LWP rolled out while the high pri thread is now needed to run.
 

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LEARN ABOUT NETBSD

_lwp_wait

_LWP_WAIT(2)						      BSD 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

     Upon successful completion, _lwp_wait() returns a value of 0.  Otherwise, an error code is returned to indicate the error.

ERRORS

     _lwp_wait() will fail if:

     [ESRCH]	No undetached 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.

     [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.

BSD
								 January 13, 2003							       BSD
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