Annotation of prex/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: }
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