#include?
#include?
#include?
#include?

pthread_mutex_t?lock?=?PTHREAD_MUTEX_INITIALIZER;
int?t?N;
long?double?ans?=?0;

long?double?Pi（int?start?int?end）{
	long?double?ans?=?0;
????for（int?i?=?start;?i?????	ans?+=?4/（1?+?（（（double）i?+?0.5）/N）*（（（double）i?+?0.5）/N））/N;
????}
????return?ans;
}

void?get_parameter（）{
	printf（“Please?input?N:“）;
	scanf（“%d“?&N）;
	printf（“Please?input?the?number?of?the?threads:“）;
	scanf（“%d“?&t）;
}

int?if_continue（）{
	printf（“Input?1?to?continue?0?to?terminate:“）;
	int?loop;
	scanf（“%d“?&loop）;
	return?loop;
}

void?*thread（void?*ID）
{??????
	int?id?=?（int）ID;
	pthread_mutex_lock（&lock）;
	
	int?step?=?N?/?t;
	long?double?thread_ans?=?Pi（id?*?step?（id?+?1）?*?step）;
	ans?+=?thread_ans;
	?????
?	pthread_mutex_unlock（&lock）;
?	return?（void*）0;
}

int?main（）{
????int?loop?=?1;
????
????while（loop）{
????	ans?=?0;
????	get_parameter（）;
????	
????	pthread_t?*threads;
????	threads?=?（pthread_t*）malloc（sizeof（pthread_t）?*?t）;
????	
????	for（int?i?=?0;?i???			pthread_create（&threads[i]?NULL?thread?（void*）（long）i）;
??		}
??		
??		for（int?i?=?0;?i?	???	?????pthread_join（threads[i]?NULL）;
	??	}
	??	
	??	printf（“Pi?is:%.15LF\n“?ans）;
	??	
????	loop?=?if_continue（）;
????}


????return?0;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-01-25?19:56??操作系統\
?????文件????20094393??2018-10-18?11:37??操作系統\UNIX環境高級編程第二版.pdf
?????文件????????4028??2018-11-03?23:59??操作系統\debug.log
?????目錄???????????0??2019-01-25?19:56??操作系統\吳老師課件\
?????文件?????2477662??2019-01-12?21:38??操作系統\吳老師課件\01.Introduction.pdf
?????文件??????588752??2019-01-12?21:38??操作系統\吳老師課件\02.Processes.pdf
?????文件??????984779??2019-01-12?21:38??操作系統\吳老師課件\03.Threads.pdf
?????文件??????426724??2019-01-12?21:38??操作系統\吳老師課件\04.Scheduling.pdf
?????文件?????1058479??2019-01-12?21:38??操作系統\吳老師課件\05.Race-Semaphore.pdf
?????文件??????923791??2019-01-12?21:38??操作系統\吳老師課件\06.IPC.pdf
?????文件??????306562??2019-01-12?21:39??操作系統\吳老師課件\07.Deadlock.pdf
?????文件??????706560??2019-01-12?21:38??操作系統\吳老師課件\Linux01-安裝與使用.ppt
?????文件?????1106432??2019-01-12?21:38??操作系統\吳老師課件\Linux02-文件與目錄.ppt
?????文件??????589824??2019-01-12?21:38??操作系統\吳老師課件\Linux03-進程管理.ppt
?????文件??????629248??2019-01-12?21:37??操作系統\吳老師課件\Linux04-使用shell.ppt
?????文件??????584704??2019-01-12?21:38??操作系統\吳老師課件\Linux05-編寫shell?script.ppt
?????文件???????16084??2019-01-12?21:39??操作系統\吳老師課件\ex01.pv.docx
?????文件???????23381??2019-01-12?21:39??操作系統\吳老師課件\ex02.process.docx
?????文件???????24110??2018-01-06?22:04??操作系統\吳老師課件\課后習題11.30.doc
?????文件???????30720??2017-12-20?14:08??操作系統\吳老師課件\隨堂練習11.30.doc
?????目錄???????????0??2019-01-16?11:45??操作系統\復習\
?????文件???????16084??2019-01-11?19:59??操作系統\復習\ex01.pv.docx
?????文件???????23381??2019-01-11?19:59??操作系統\復習\ex02.process.docx
?????文件???????14336??2018-01-08?19:46??操作系統\復習\os總復習-1.doc
?????文件?????1054451??2019-01-12?00:42??操作系統\復習\os總復習-2.doc
?????文件?????1565696??2019-01-12?00:40??操作系統\復習\os總復習-3.doc
?????文件?????4343887??2017-11-23?18:06??操作系統\復習\現代操作系統（中文第三版）習題答案.pdf
?????文件?????1328775??2019-01-15?00:45??操作系統\復習\簡答.docx
?????目錄???????????0??2019-01-11?20:03??操作系統\復習\考研題\
?????文件??????941222??2017-12-30?10:56??操作系統\復習\考研題\2009年考研計算機統考真題及答案解析.pdf
?????文件??????945217??2017-12-30?10:55??操作系統\復習\考研題\2010年考研計算機統考真題及答案解析.pdf
............此處省略51個文件信息