Annotation of prex/usr/sample/thread/thread.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2005, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * thread.c - sample program to create three threads.
32: */
33:
34: #include <prex/prex.h>
35: #include <stdio.h>
36:
37: #define VERBOSE_MODE
38:
39: #ifdef VERBOSE_MODE
40: #define thr_printf(s) printf(s)
41: #else
42: #define thr_printf(s)
43: #endif
44:
45: static thread_t main_th;
46: static char stack[3][1024];
47:
48: /*
49: * Run specified routine as new thread.
50: */
51: static int
52: thread_run(void (*start)(void), void *stack)
53: {
54: thread_t th;
55:
56: if (thread_create(task_self(), &th) != 0)
57: return -1;
58:
59: if (thread_load(th, start, stack) != 0)
60: return -1;
61:
62: if (thread_resume(th) != 0)
63: return -1;
64: return 0;
65: }
66:
67: /*
68: * Display 'AAAA...'
69: */
70: static void
71: thread_A(void)
72: {
73: int i;
74:
75: thr_printf("\nthread A is starting\n");
76:
77: for (i = 0; i < 1024; i++) {
78: thr_printf("A");
79: if ((i & 0xff) == 0)
80: thread_yield();
81: }
82: thr_printf("\nthread A is terminated\n");
83: thread_terminate(thread_self());
84: }
85:
86: /*
87: * Display 'BBBB...'
88: */
89: static void
90: thread_B(void)
91: {
92: int i;
93:
94: thr_printf("\nthread B is starting\n");
95:
96: for (i = 0; i < 4096; i++) {
97: thr_printf("B");
98: if ((i & 0xff) == 0)
99: thread_yield();
100: }
101: thr_printf("\nthread B is terminated\n");
102: thread_terminate(thread_self());
103: }
104:
105: /*
106: * Display 'CCCC...'
107: */
108: static void
109: thread_C(void)
110: {
111: int i;
112:
113: thr_printf("\nthread C is starting\n");
114:
115: for (i = 0; i < 8192; i++) {
116: thr_printf("C");
117: if ((i & 0xff) == 0)
118: thread_yield();
119: }
120: thr_printf("\nthread C is terminated\n");
121: thread_terminate(thread_self());
122: }
123:
124: int
125: main(int argc, char *argv[])
126: {
127: int err;
128:
129: printf("Thread sample program\n");
130: main_th = thread_self();
131:
132: /*
133: * Raise this thread's priority.
134: */
135: err = thread_setprio(main_th, 100);
136:
137: /*
138: * Run threads as normal priority thread.
139: */
140: thread_run(thread_A, stack[0]+1024);
141: thread_run(thread_B, stack[1]+1024);
142: thread_run(thread_C, stack[2]+1024);
143:
144: /*
145: * Lower this thread's priority.
146: */
147: err = thread_setprio(main_th, 254);
148:
149: /*
150: * Since other threads have higher priority than
151: * this thread, the control will come here only when
152: * all other threads are terminated.
153: */
154: printf("test - OK!\n");
155: return 0;
156: }
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