xref: /illumos-gate/usr/src/lib/efcode/extend/fthread.c (revision 7c478bd9)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright (c) 2000 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <stdio.h>
30 #include <fcode/private.h>
31 #include <fcode/log.h>
32 
33 static int envp;
34 static int envc;
35 static fcode_env_t *envs[4];
36 
37 static void
do_clone(fcode_env_t * cenv)38 do_clone(fcode_env_t *cenv)
39 {
40 	fcode_env_t *new;
41 
42 	if (envc < 4) {
43 		envs[envc] = env;
44 		envc++;
45 		new = clone_environment(cenv, NULL);
46 		if (new) {
47 			envs[envc] = new;
48 			env = new;
49 			return;
50 		}
51 	}
52 	system_message(cenv, "clone failed");
53 }
54 
55 static void
do_switch(fcode_env_t * cenv)56 do_switch(fcode_env_t *cenv)
57 {
58 	int bail = 4;
59 	do {
60 		envp = (envp+1)%4;
61 		env = envs[envp];
62 		bail--;
63 	} while ((env == NULL) && (!bail));
64 	log_message(MSG_INFO, "Env: %x\n", env);
65 }
66 
67 static void
do_release(fcode_env_t * cenv)68 do_release(fcode_env_t *cenv)
69 {
70 	int bail = 4;
71 	destroy_environment(envs[envp]);
72 	envs[envp] = NULL;
73 	do {
74 		envp = (envp+1)%4;
75 		env = envs[envp];
76 		bail--;
77 	} while ((env == NULL) && (!bail));
78 }
79 
80 #pragma init(_init)
81 
82 static void
_init(void)83 _init(void)
84 {
85 	fcode_env_t *env = initial_env;
86 
87 	ASSERT(env);
88 	NOTICE;
89 
90 	envp = 0;
91 	envc = 0;
92 
93 	FORTH(0,	"clone",		do_clone);
94 	FORTH(0,	"switch",		do_switch);
95 	FORTH(0,	"release",		do_release);
96 }
97