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  • 大小: 2KB
    文件類型: .c
    金幣: 1
    下載: 0 次
    發(fā)布日期: 2021-06-09
  • 語言: C/C++
  • 標簽: C語言??閱覽室??

資源簡介

閱覽室里有20個座位，外面有10個等待位，若讀者來時發(fā)現(xiàn)等待位已滿則離去。用C語言多線程實現(xiàn)，用信號量實現(xiàn)同步互斥

資源截圖

代碼片段和文件信息 

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

#define?READING?0;
#define?WAITING?1;

int?readerNum=0;
int?waitNum=0;

sem_t?synchronize;
sem_t?seat;
sem_t?room;

void?*waitingroom（）?{
????while（1）?{
	sem_wait（&synchronize）;
	sem_wait（&seat）;
	waitNum=waitNum+1;
	printf（“There?are?%d?readers?reading.?\n“?readerNum）;
	printf（“There?are?%d?readers?waiting.?\n“?waitNum）;
????}
}

void?*come（）?{
????while（1）?{
??????printf（“---------------------------------\n“）;
??????printf（“A?new?reader?comes.?\n“）;
??????
??????if（readerNum>=20&&waitNum>=10）?{
	printf（“The?reader?left.?\n“）;
??????}else?if（readerNum>=20）?{
	??printf（“A?new?reader?is?waiting.?\n“）;
	??sem_post（&synchronize）;
	??sem_wait（&room）;
??????}else?{
	readerNum=readerNum+1;
	printf（“There?are?%d?readers?reading.?\n“?readerNum）;
	printf（“There?are?%d?readers?waiting.?\n“?waitNum）;
??????}

??????sleep（1）;
????}
????
}

int?main（）?{
????int?res;
????pthread_t?thread;
??

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