usr/test/sem/sem.c

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   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  * sem.c - test program for semaphore.
  32  */
  33 
  34 #include <sys/prex.h>
  35 #include <stdio.h>
  36 
  37 int
  38 main(int argc, char *argv[])
  39 {
  40         sem_t sem;
  41         int error;
  42         u_int val;
  43 
  44         printf("Semaphore test program\n");
  45 
  46         /*
  47          * Test initialize
  48          */
  49         sem_init(&sem, 3);
  50 
  51         /*
  52          * Test wait
  53          */
  54         error = sem_getvalue(&sem, &val);
  55         printf("Semaphore value=%d\n", val);
  56 
  57         printf("1) Wait semahore\n");
  58         error = sem_wait(&sem, 0);
  59         if (error)
  60                 panic("wait error");
  61 
  62         error = sem_getvalue(&sem, &val);
  63         printf("Semaphore value=%d\n", val);
  64 
  65         printf("2) Wait semahore\n");
  66         error = sem_wait(&sem, 0);
  67         if (error)
  68                 panic("wait error");
  69 
  70         error = sem_getvalue(&sem, &val);
  71         printf("Semaphore value=%d\n", val);
  72 
  73         printf("3) Wait semahore\n");
  74         error = sem_wait(&sem, 0);
  75         if (error)
  76                 panic("wait error");
  77 
  78         error = sem_getvalue(&sem, &val);
  79         printf("Semaphore value=%d\n", val);
  80 
  81 #if 0
  82         /*
  83          * Sleep by wait
  84          */
  85         printf("4) Wait semahore\n");
  86         error = sem_wait(&sem, 0);
  87         if (error)
  88                 panic("wait error");
  89 #endif
  90         /*
  91          * trywait must be error.
  92          */
  93         printf("4e) Try to wait semahore\n");
  94         error = sem_trywait(&sem);
  95         printf("Try wait error=%d\n", error);
  96 
  97         /*
  98          * Test post
  99          */
 100         printf("5) Post semahore\n");
 101         error = sem_post(&sem);
 102         if (error)
 103                 panic("post error");
 104         error = sem_getvalue(&sem, &val);
 105         printf("Semaphore value=%d\n", val);
 106 
 107         printf("Test complete\n");
 108         return 0;
 109 }
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root/usr/test/sem/sem.c

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