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      1 /*	$NetBSD: rump_curlwp___thread.h,v 1.3 2018/04/19 21:50:10 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 extern __thread struct lwp *curlwp_storage;
     29 #ifdef RUMP__CURLWP_PRIVATE
     30 #include <rump/rumpuser.h>
     31 
     32 __thread struct lwp *curlwp_storage;
     33 static void
     34 lwproc_curlwpop(enum rumplwpop op, struct lwp *l)
     35 {
     36 
     37 	switch (op) {
     38 	case RUMPUSER_LWP_CREATE:
     39 	case RUMPUSER_LWP_DESTROY:
     40 		break;
     41 	case RUMPUSER_LWP_SET:
     42 		KASSERT(curlwp_storage == NULL);
     43 		curlwp_storage = l;
     44 		break;
     45 	case RUMPUSER_LWP_CLEAR:
     46 		KASSERT(curlwp_storage == l);
     47 		curlwp_storage = NULL;
     48 		break;
     49 	}
     50 	/*
     51 	 * Need to keep hypercall layer in sync, since it can use curlwp
     52 	 * for things like mutexes.  Should be fixed/adjusted somehow.
     53 	 */
     54 	rumpuser_curlwpop(op, l);
     55 }
     56 #endif
     57 
     58 static __inline struct lwp * __attribute__((const))
     59 rump_curlwp_fast(void)
     60 {
     61 
     62 	return curlwp_storage;
     63 }
     64