void initialize_system ()
{
FILE *fconfig;
fconfig = fopen ("config.sys", "r");
fscanf (fconfig, "%d\n", &Observe);
fscanf (fconfig, "%d %d\n", &cpuQuantum, &idleQuantum);
fscanf (fconfig, "%d %d %d %d\n", &pageSize, &memSize, &swapSize, &OSmemSize);
fscanf (fconfig, "%d\n", &periodAgeScan);
fscanf (fconfig, "%d\n", &spoolPsize);
fclose (fconfig);
OriginalPages= find_pages(memSize,pageSize);
OriginalPages_swapspace = find_pages(swapSize,pageSize);
rem_pages = OriginalPages;
rem_pages_swapspace = OriginalPages_swapspace;
#undef num_pages
#define num_pages OriginalPages;
OSpages= find_pages(OSmemSize,pageSize);
printf("OS Size is %d , OS pages are %d\n", OSmemSize, OSpages);
rem_pages= OriginalPages-OSpages;
idlePages= find_pages(3, pageSize);
/*printf("Idle Size is 256, Idle pages are %d, rem pages are %d \n", idlePages, rem_pages);
rem_pages = rem_pages-idlePages;*/
printf("remaining pages are %d\n", rem_pages);
#undef num_pages
#define num_pages rem_pages;
printf("Number of frames in Main memory is %d remaininng pages are %d\n", OriginalPages, rem_pages);
initialize_cpu ();
printf("initialized CPU \n");
initialize_swap_freelist(rem_pages_swapspace, OriginalPages_swapspace);
printf("initialized Swap Space \n");
initialize_freelist(rem_pages, OriginalPages);
printf("initialized Main Memory \n");
initialize_timer ();
printf("initialized timer \n");
initialize_memory ();
printf("initialized memory \n");
initialize_process ();
printf("initialized process \n");
// initialize_memory ();
// printf("initialized memory \n");
}
static job* initialize_job() {
job *j;
if((j = (job*)malloc(sizeof(job))) == NULL)
return NULL;
j->mode = FOREGROUND;
j->process_list = initialize_process();
j->next = NULL;
return j;
}
/* 受け付けた文字列を解析して結果をjob構造体に入れる関数 */
job* parse_line(char *buf) {
job *curr_job = NULL;
process *curr_prc = NULL;
parse_state state = ARGUMENT;
int index=0, arg_index=0;
/* 改行文字まで解析する */
while(*buf != '\n') {
/* 空白およびタブを読んだときの処理 */
if(*buf == ' ' || *buf == '\t') {
buf++;
if(index) {
index = 0;
state = ARGUMENT;
++arg_index;
}
}
/* 以下の3条件は、状態を遷移させる項目である */
else if(*buf == '<') {
state = IN_REDIRCT;
buf++;
index = 0;
} else if(*buf == '>') {
buf++;
index = 0;
if(state == OUT_REDIRCT_TRUNC) {
state = OUT_REDIRCT_APPEND;
if(curr_prc)
curr_prc->output_option = APPEND;
}
else {
state = OUT_REDIRCT_TRUNC;
}
} else if(*buf == '|') {
state = ARGUMENT;
buf++;
index = 0;
arg_index = 0;
if(curr_job) {
strcpy(curr_prc->program_name,
curr_prc->argument_list[0]);
curr_prc->next = initialize_process();
curr_prc = curr_prc->next;
}
}
/* &を読めば、modeをBACKGROUNDに設定し、解析を終了する */
else if(*buf == '&') {
buf++;
if(curr_job) {
curr_job->mode = BACKGROUND;
break;
}
}
/* 以下の3条件は、各状態でprocess構造体の各メンバに文字を格納する */
/* 状態ARGUMENTは、 リダイレクション対象ファイル名以外の文字(プログラム名、オプション)を
読む状態 */
/* 状態IN_REDIRCTは入力リダイレクション対象ファイル名を読む状態 */
/* 状態OUT_REDIRCT_*は出力リダイレクション対象ファイル名を読む状態 */
else if(state == ARGUMENT) {
if(!curr_job) {
curr_job = initialize_job();
curr_prc = curr_job->process_list;
}
if(!curr_prc->argument_list[arg_index])
initialize_argument_list_element(curr_prc, arg_index);
curr_prc->argument_list[arg_index][index++] = *buf++;
} else if(state == IN_REDIRCT) {
if(!curr_prc->input_redirection)
initialize_input_redirection(curr_prc);
curr_prc->input_redirection[index++] = *buf++;
} else if(state == OUT_REDIRCT_TRUNC || state == OUT_REDIRCT_APPEND) {
if(!curr_prc->output_redirection)
initialize_output_redirection(curr_prc);
curr_prc->output_redirection[index++] = *buf++;
}
}
/* 最後に、引数の0番要素をprogram_nameにコピーする */
if(curr_prc)
strcpy(curr_prc->program_name, curr_prc->argument_list[0]);
return curr_job;
}
