basic.h

信号量也称为信号锁

#ifndef basic_h
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define basic_h

char *errormsg[256];

//process control block
struct pcb
{
	int pid;                  //process id
	int ppid;                 //parent process id
	int prio;                 //priority
	int state;                //state 
	int lasttime;             //last execute time
	int tottime;              //totle execute time

};

//process node
struct pnode
{
	pcb *node;
	pnode *sub;
	pnode *brother;
	pnode *next;
};

//信号量
struct semphore{
	char name[5];  //名称
	int count;     //计数值
	int curpid;  //当前进程id
	pnode *wlist; //等待列表
};

#define geterror(eno)	printf("%s\n",errormsg[eno])

void initerror()
{
	errormsg[0] = (char *)malloc(20);
	errormsg[0]="error command!";
	errormsg[1] = (char *)malloc(20);
	errormsg[1]="error parameter!";
}

//get a substring in string s
char * substr(char *s,int start,int end)
{
	char *s1;
	int len = strlen(s);
	if(start<0 || end>=len || start>end)
		return NULL;
	s1=(char *)malloc(end-start+2);
	for(int i=0;i<=end-start;i++)
		s1[i] = s[i+start];
	s1[i]='\0';
	return s1;
}

//find the location of c in string s
int instr(char *s,char c)
{
	int i;
	for(i=0;i<strlen(s);i++)
		if(s[i]==c)
			return i;
	return -1;
}

//change the string to array data
int * strtoarray(char *s)
{
	int *a,count,i,x1;
	char c, *s1,*s2;
	if(!s)
	{
		printf("string can't be null!\n");
		return NULL;
	}
	count=0;
	s1=s;
	for(i=0;i<strlen(s1);i++)
		if(s1[i]==',')
			count++;
	count++;
	a = (int *)malloc(count);
	c=',';
	for(i=0;i<count;i++)
	{
		x1 = instr(s1,c);
		if(x1>=0)
			s2=substr(s1,0,x1-1);
		else
			s2=s1;
		a[i]=atoi(s2);
		if(c==',')
			s1=substr(s1,x1+1,strlen(s1)-1);
	}
	return a;
}
#endif