Annotation of prex-old/usr/sample/ipc/ipc.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: * ipc.c - A sample program for IPC message transmission.
! 32: */
! 33:
! 34: #include <prex/prex.h>
! 35: #include <prex/message.h>
! 36: #include <stdio.h>
! 37: #include <string.h>
! 38:
! 39: /*
! 40: * Message structure
! 41: */
! 42: struct chat_msg {
! 43: struct msg_header hdr; /* Message header */
! 44: char str[128]; /* String */
! 45: };
! 46:
! 47:
! 48: static char stack[1024];
! 49:
! 50: /*
! 51: * Start client task/thread
! 52: */
! 53: static task_t
! 54: start_client(void (*func)(void), char *stack)
! 55: {
! 56: task_t task;
! 57: thread_t th;
! 58:
! 59: #ifdef CONFIG_MMU
! 60: if (task_create(task_self(), VM_COPY, &task) != 0)
! 61: return 0;
! 62: #else
! 63: task = task_self();
! 64: #endif
! 65: if (thread_create(task, &th) != 0)
! 66: return 0;
! 67:
! 68: if (thread_load(th, func, stack) != 0)
! 69: return 0;
! 70:
! 71: if (thread_resume(th) != 0)
! 72: return 0;
! 73:
! 74: return task;
! 75: }
! 76:
! 77: /*
! 78: * Send message to server
! 79: */
! 80: void
! 81: send_message(object_t obj, const char *str)
! 82: {
! 83: struct chat_msg msg;
! 84:
! 85: timer_sleep(2000, 0);
! 86: strcpy(msg.str, str);
! 87: msg_send(obj, &msg, sizeof(msg));
! 88: printf("client: Received \"%s\"\n", msg.str);
! 89: }
! 90:
! 91:
! 92: /*
! 93: * Client task
! 94: */
! 95: static void
! 96: client_task(void)
! 97: {
! 98: object_t obj;
! 99: int err;
! 100:
! 101: printf("Client is started\n");
! 102:
! 103: /*
! 104: * Find objects.
! 105: */
! 106: if ((err = object_lookup("/foo/bar", &obj)) != 0)
! 107: panic("can not find object");
! 108:
! 109: /*
! 110: * Send message per 2 second.
! 111: */
! 112: send_message(obj, "Hello!");
! 113: send_message(obj, "This is a client task.");
! 114: send_message(obj, "Who are you?");
! 115: send_message(obj, "How are you?");
! 116: send_message(obj, "....");
! 117: send_message(obj, "Bye!");
! 118: send_message(obj, "Exit");
! 119:
! 120: #ifdef CONFIG_MMU
! 121: printf("Exit client task...\n");
! 122: task_terminate(task_self());
! 123: #endif
! 124: }
! 125:
! 126: int
! 127: main(int argc, char *argv[])
! 128: {
! 129: object_t obj;
! 130: struct chat_msg msg;
! 131: int err, exit;
! 132:
! 133: printf("IPC sample program\n");
! 134:
! 135: /*
! 136: * Boost priority of this thread
! 137: */
! 138: thread_setprio(thread_self(), 90);
! 139:
! 140: /*
! 141: * Create object
! 142: */
! 143: if ((err = object_create("/foo/bar", &obj)) != 0)
! 144: panic("fail to create object");
! 145:
! 146: /*
! 147: * Start client task.
! 148: */
! 149: if (start_client(client_task, stack+1024) == 0)
! 150: panic("fail to create task");
! 151:
! 152: /*
! 153: * Message loop
! 154: */
! 155: exit = 0;
! 156: while (exit == 0) {
! 157: /*
! 158: * Wait for an incoming request.
! 159: */
! 160: err = msg_receive(obj, &msg, sizeof(msg));
! 161: if (err)
! 162: continue;
! 163: /*
! 164: * Process request.
! 165: */
! 166: printf("server: Received \"%s\"\n", msg.str);
! 167: if (!strcmp(msg.str, "Exit"))
! 168: exit = 1;
! 169:
! 170: if (!strcmp(msg.str, "Hello!"))
! 171: strcpy(msg.str, "Hi.");
! 172: else if (!strcmp(msg.str, "Bye!"))
! 173: strcpy(msg.str, "Bye.");
! 174: else
! 175: strcpy(msg.str, "OK.");
! 176:
! 177: /*
! 178: * Reply to the client.
! 179: */
! 180: msg_reply(obj, &msg, sizeof(msg));
! 181: }
! 182: timer_sleep(1000, 0);
! 183: printf("End...\n");
! 184: return 0;
! 185: }
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