#include????/*里面包含了很多BIOS和DOS調(diào)用函數(shù)*/
#include????/*動(dòng)態(tài)分配內(nèi)存，相當(dāng)于malloc.h*/
#include??
#include?
#include????/*包含對(duì)字符數(shù)組操作的函數(shù)*/
/*#include?“indos.c“
#include?“exterr.c“*/

#define?GET_INDOS?0X34
#define?GET_GRIT_ERR?0X5D06

#define?NTCB?5???/*表示系統(tǒng)允許的最大線(xiàn)程數(shù)*/
#define?NTEXT?20????/*消息的最大字節(jié)數(shù)*/?
#define?NBUF??5?????/*消息緩沖區(qū)的數(shù)目*/
/*#define?TL???3*/

/*?state?code?*/
/*?null		0		not?assigned?*/
#define?FINISHED?0????/*表示線(xiàn)程處于終止態(tài)或TCB是空白狀態(tài)*/?
#define	RUNNING	1?????/*表示線(xiàn)程處于運(yùn)行狀態(tài)*/
#define?READY?	2?????/*表示線(xiàn)程處于就緒狀態(tài)*/
#define?BLOCKED?3?????/*表示線(xiàn)程處于阻塞狀態(tài)*/

unsigned?oldssoldsp;
static?int?current=0;	/*?the?tcb?index?of?the?current?process?當(dāng)前正在運(yùn)行的進(jìn)程的ID?*/
int?multstop=1;
int?timecount=0;
int?TL;
int?n?=0;
int?buf1;

char?far?*indos_ptr?=?0?;??/*INDOS標(biāo)志的地址*/
char?far?*crit_err_ptr?=?0?;???/*嚴(yán)重錯(cuò)誤標(biāo)志的地址*/
/*?the?pointer?to?the?process‘s?code指針指向進(jìn)程的代碼??*/
typedef?int?（far?*codeptr）（void）;

/*信號(hào)量結(jié)構(gòu)體，記錄型信號(hào)量*/?
typedef?struct{
??int?value;???/*信號(hào)量的值，表示空閑資源的總數(shù)*/
??struct?TCB?*wq;???/*線(xiàn)程阻塞隊(duì)列隊(duì)首指針*/
}?semaphore;

semaphore?mutexfb={1NULL};/*?是一個(gè)關(guān)鍵資源空閑消息緩沖隊(duì)列的互斥信號(hào)量?*/
semaphore?sfb={NBUFNULL};/*?空閑消息緩沖隊(duì)列的計(jì)數(shù)信號(hào)量?*/
semaphore?mutex={1NULL};??/*對(duì)n執(zhí)行加操作時(shí)的信號(hào)量，f5和f6會(huì)用到*/?
semaphore?sa={1NULL}sb={0NULL};
/*消息緩沖區(qū)*/
struct?buffer?{
??int?id;
??int?size;???/*消息長(zhǎng)度*/
??char?text[NTEXT];??/*消息正文*/?
??struct?buffer?*next;??/*指向下一個(gè)消息緩沖區(qū)的指針*/
}?buf[NBUF]*freebuf;??/*buf[]是消息隊(duì)列，freebuf指向消息隊(duì)列中的某條消息*/?
/*線(xiàn)程控制塊*/
struct?TCB?{
	int?		id;???/*?unique?process?id?*/
	char		name[10];	/*?線(xiàn)程的外部標(biāo)識(shí)符?*/
	unsigned?char?*stack;?/*?線(xiàn)程堆棧的真實(shí)地址?*/
	unsigned?	sp;??/*堆棧指針，指向棧頂內(nèi)容*/
????unsigned?	ss;??/*堆棧段址，存放程序下一條指令所在的地址*/
	char?		state;?/*線(xiàn)程狀態(tài)，取值可以是FINISHED、RUNNING、READY、BLOCKED*/
	unsigned?	*chan;?/*?event?process?is?awainting?*/
	struct?buffer?*mq;???/*接受線(xiàn)程的消息隊(duì)列隊(duì)首指針*/?
	semaphore?????mutex;??/*接收線(xiàn)程的消息隊(duì)列的互斥信號(hào)量*/
	semaphore?????sm;???/*接收線(xiàn)程的消息隊(duì)列的計(jì)數(shù)信號(hào)量，用于實(shí)現(xiàn)同步*/?
	struct?TCB???*next;?/*?指向下一個(gè)線(xiàn)程的指針?*/
}?tcb[NTCB]?;


/*?the?registers?pushed?in?the?stack?after?entering?an?interrupt?funtion?*/
/*struct?int_regs?{
??unsigned?bpdisidsesdxcxbxaxipcsflags;
};*、?

/*頭文件的這個(gè)數(shù)據(jù)結(jié)構(gòu)修改成這樣?線(xiàn)程的私有堆棧，保存現(xiàn)場(chǎng)信息*/
struct?int_regs?{
	unsigned?bpdisidsesdxcxbxaxipcsflagsoffseg;
	/*????段寄存器cs指向存放程序的內(nèi)存段，ip是用來(lái)執(zhí)行下條待執(zhí)行指令在內(nèi)存中的偏移量
	??把他們和在一起可在該內(nèi)存段?內(nèi)取到下次要執(zhí)行的指令，
	??????段寄存器ss指向用于堆棧的內(nèi)存段，sp指向該堆棧的棧頂，和在一起可訪(fǎng)問(wèn)棧頂單元
??????當(dāng)偏移量用到了指針寄存器BP，則其缺省的段寄存器是SS，并且可用BP訪(fǎng)問(wèn)整個(gè)堆棧?
	??????段寄存器ds指向數(shù)據(jù)段，es指向附加段，存放當(dāng)前執(zhí)行程序中一個(gè)輔助數(shù)據(jù)段的段地址在存取操作數(shù)時(shí)，二者之一和一個(gè)偏移量合并就可得到存儲(chǔ)單元的物理地址
	??該偏移量可以是具體數(shù)值，符號(hào)地址和指針寄存器的值等之一
	??SI，DI是變址寄存器，flags是標(biāo)志寄存器?
?段寄存器?????????????偏移地址寄存器
?CS??????????????????IP
?SS????????????????SP或BP
?DS????????????????BX、DI、SI?
?ES???????????????DI（用于串指令）
	*/
};

/*struct?{
??char?name[10];
??codeptr?code;
}table[NTCB]={“f1“f1;
	??????“f2“f2;
	??????“f3“f3;
	??????“f4“f4;
	??????};
*/
void?interrupt?（*old_int8）（void）;??/*定義用于處理中斷的函數(shù)?*/
void?interrupt?new_int8（void）;???/*時(shí)間片到時(shí)引起的CPU調(diào)度*/
int?create（char?*name

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????目錄???????????0??2016-09-24?10:55??多任務(wù)系統(tǒng)\
?????文件???????28479??2016-05-27?00:49??多任務(wù)系統(tǒng)\amy_main.c
?????文件???????21498??2016-05-27?00:19??多任務(wù)系統(tǒng)\一個(gè)發(fā)送者兩個(gè)接受者.c
?????文件??????443145??2016-06-12?00:13??文件系統(tǒng)\amain.exe
?????文件???????34414??2016-06-12?00:13??文件系統(tǒng)\amain.c
?????目錄???????????0??2016-09-24?10:55??文件系統(tǒng)\
?????文件??????359136??2016-09-24?10:55??操作系統(tǒng)課程設(shè)計(jì).docx
?????文件????10485762??2016-06-12?14:54??文件系統(tǒng)\虛擬磁盤(pán).disk