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Annotation of prex-old/usr/sample/thread/thread.c, Revision 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: }