test_readhappy.c revision 1.1.2.2
1 1.1.2.2 pgoyette /* $NetBSD: test_readhappy.c,v 1.1.2.2 2018/04/22 07:20:27 pgoyette Exp $ */ 2 1.1.2.2 pgoyette 3 1.1.2.2 pgoyette /* 4 1.1.2.2 pgoyette * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 1.1.2.2 pgoyette * All rights reserved. 6 1.1.2.2 pgoyette * 7 1.1.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.1.2.2 pgoyette * are met: 10 1.1.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.1.2.2 pgoyette * 16 1.1.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1.2.2 pgoyette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1.2.2 pgoyette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1.2.2 pgoyette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1.2.2 pgoyette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1.2.2 pgoyette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1.2.2 pgoyette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1.2.2 pgoyette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1.2.2 pgoyette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1.2.2 pgoyette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1.2.2 pgoyette * POSSIBILITY OF SUCH DAMAGE. 27 1.1.2.2 pgoyette */ 28 1.1.2.2 pgoyette 29 1.1.2.2 pgoyette #include <err.h> 30 1.1.2.2 pgoyette #include <errno.h> 31 1.1.2.2 pgoyette #include <pthread.h> 32 1.1.2.2 pgoyette #include <stdio.h> 33 1.1.2.2 pgoyette #include <stdlib.h> 34 1.1.2.2 pgoyette 35 1.1.2.2 pgoyette /* 36 1.1.2.2 pgoyette * Compile this program with -pthread and run it to test the readhappy_mpsafe 37 1.1.2.2 pgoyette * module. This program should print out happy numbers read from /dev/happy_mpsafe. 38 1.1.2.2 pgoyette * Insert the module and make the /dev/happy_mpsafe node before executing this file. 39 1.1.2.2 pgoyette */ 40 1.1.2.2 pgoyette 41 1.1.2.2 pgoyette 42 1.1.2.2 pgoyette static void* read_happy(void *); 43 1.1.2.2 pgoyette 44 1.1.2.2 pgoyette static FILE *fp; 45 1.1.2.2 pgoyette 46 1.1.2.2 pgoyette /* 47 1.1.2.2 pgoyette * thread function used to read /dev/happy_mpsafe and print them out. 48 1.1.2.2 pgoyette */ 49 1.1.2.2 pgoyette static void * 50 1.1.2.2 pgoyette read_happy(void *unused) 51 1.1.2.2 pgoyette { 52 1.1.2.2 pgoyette int line; 53 1.1.2.2 pgoyette 54 1.1.2.2 pgoyette for (;;) { 55 1.1.2.2 pgoyette fscanf(fp, "%d", &line); 56 1.1.2.2 pgoyette printf("%d\n", line); 57 1.1.2.2 pgoyette fflush(stdout); 58 1.1.2.2 pgoyette } 59 1.1.2.2 pgoyette /* NOTREACHED */ 60 1.1.2.2 pgoyette return NULL; 61 1.1.2.2 pgoyette } 62 1.1.2.2 pgoyette 63 1.1.2.2 pgoyette /* 64 1.1.2.2 pgoyette * main function : opens /dev/happy_mpsafe and sets the global file descriptor 65 1.1.2.2 pgoyette * creates 100 threads which try to use the file descriptor to read 66 1.1.2.2 pgoyette * from /dev/happy_mpsafe. 67 1.1.2.2 pgoyette * This function does not return anything and will run in an infinite loop. 68 1.1.2.2 pgoyette */ 69 1.1.2.2 pgoyette int 70 1.1.2.2 pgoyette main(int argc, const char *argv[]) 71 1.1.2.2 pgoyette { 72 1.1.2.2 pgoyette pthread_t thr[100]; 73 1.1.2.2 pgoyette 74 1.1.2.2 pgoyette fp = fopen("/dev/happy_mpsafe","r"); 75 1.1.2.2 pgoyette if (fp == NULL) 76 1.1.2.2 pgoyette err(EXIT_FAILURE, "open"); 77 1.1.2.2 pgoyette for (int i = 0; i < 100; i++) 78 1.1.2.2 pgoyette pthread_create(&thr[i], NULL, read_happy, NULL); 79 1.1.2.2 pgoyette (void)read_happy(NULL); 80 1.1.2.2 pgoyette /* NOTREACHED */ 81 1.1.2.2 pgoyette return EXIT_SUCCESS; 82 1.1.2.2 pgoyette } 83
Indexes created Tue Sep 30 17:09:57 GMT 2025