Re-root site.

posix/pthreads.fs

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+\ Copyright 2021 Bradley D. Nelson
+\
+\ Licensed under the Apache License, Version 2.0 (the "License");
+\ you may not use this file except in compliance with the License.
+\ You may obtain a copy of the License at
+\
+\     http://www.apache.org/licenses/LICENSE-2.0
+\
+\ Unless required by applicable law or agreed to in writing, software
+\ distributed under the License is distributed on an "AS IS" BASIS,
+\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+\ See the License for the specific language governing permissions and
+\ limitations under the License.
+
+( pthreads )
+posix definitions also internals
+
+z" libpthread.so" shared-library pthread
+  z" pthread_create" 4 pthread pthread_create
+  z" pthread_join" 2 pthread pthread_join
+  z" pthread_exit" 1 pthread pthread_exit
+
+'sys 11 cells + @ constant forth_run
+
+: ++! ( n a ) cell+ dup >r ! r> ;
+: >entry ( xt sp rp -- rp ) here >r rot , ['] yield , ++! r> swap ++! ;
+
+: thread ( xt dstack rstack -- tid )
+  here >r cells allot here cell+ >r cells allot r> r> >entry ( rinit )
+  0 >r rp@ ( rinit tid )
+  0 rot forth_run swap ( tid attr forth_run rinit )
+  pthread_create throw r> ;
+: join ( tid -- ) 0 pthread_join throw ;
+
+only forth definitions
+