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127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/***************************************************************************
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* Copyright 1995, Technion, Israel Institute of Technology
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* Electrical Eng, Software Lab.
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* Author: Michael Veksler.
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***************************************************************************
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* File: shm_semaph_test.c
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* Purpose: Test semaphores handleingr shared memory operations.
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***************************************************************************
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*/
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#include <time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include "shm_semaph.h"
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#include <sys/shm.h>
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#define DEBUG_DEFINE_VARIABLES
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#include "debugtools.h"
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static volatile int * volatile data;
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static int isparent=0;
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#define DELAY (rand()%10)
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shm_sem sem;
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static void read_write(int num)
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{
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int i,j ;
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volatile float dummy=0;
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int val;
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srand(num+time(NULL));
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for (i=0x3fff;i>=0;i--) {
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if((i&0x7ff)==0 && isparent)
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fprintf(stderr,"0x%06x\r",i);
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shm_write_wait(sem);
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*data= num;
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for (j=DELAY ; j>=0;j--)
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dummy*=2;
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if (*data!=num) {
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fprintf(stderr,"\nbad shm_write_wait(), num=%d\n",num);
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shm_write_signal(sem);
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return;
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}
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shm_write_signal(sem);
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for (j=DELAY ; j>=0 ;j--)
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dummy*=2;
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shm_read_wait(sem);
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val=*data;
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for (j=DELAY; j>=0 ;j--)
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dummy*=0.5;
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if (*data!=val) {
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fprintf(stderr,"\nbad shm_read_wait(), num=%d,val=%d,*data=%d\n",
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num,val,*data);
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shm_read_signal(sem);
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return;
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}
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shm_read_signal(sem);
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}
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if (isparent)
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fputc('\n',stderr);
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}
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static void child1()
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{
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read_write(2);
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}
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static void child2()
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{
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read_write(10);
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}
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static void parent()
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{
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isparent=1;
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read_write(60);
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}
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int main()
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{
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int shmid;
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int ret1, ret2;
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int pid1, pid2;
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int stat=0;
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shm_sem_init(&sem);
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shmid=shmget(IPC_PRIVATE, 0x100, IPC_CREAT | 0700);
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data= (int *)shmat ( shmid, NULL, 0);
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*data=0;
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switch (pid1=fork()) {
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case -1:
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perror("fork 1");
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return 1;
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case 0:
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fprintf(stderr,"child1\n");
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child1();
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fprintf(stderr,"child1 done\n");
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return 0;
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default :
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}
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switch (pid2=fork()) {
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case -1:
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perror("fork 2");
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stat|=1;
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break;
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case 0:
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fprintf(stderr,"child2\n");
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child2();
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fprintf(stderr,"child2 done\n");
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return 0;
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default :
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}
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fprintf(stderr,"parent\n");
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if (pid2>0) { /* if second fork did not fail */
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parent();
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fprintf(stderr,"parent done, waiting for child2\n");
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waitpid(pid2,&ret2,WUNTRACED);
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stat|=ret2;
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}
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fprintf(stderr,"parent done, waiting for child1\n");
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waitpid(pid1,&ret1,WUNTRACED);
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stat|=ret1;
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fprintf(stderr,"all done\n");
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shmctl(shmid, IPC_RMID,NULL);
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shm_sem_done(&sem);
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return stat;
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}
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