我感觉本次实验的精华全部都在前面跟踪地址映射过程。实验文档写的很详细了，大家一定要跟着做一下。本次跟上次的套路几乎一样。刚好还要用到上次的信号量，辛亏我没有删除本地的。先进行ubuntu本地测试。 producer.c ``` #include #include #include #include #include #include #include #include #define PRODUCE_NUM 800 #define BUFF_SIZE 10 #define SHM_KEY 12345 void die(const char *p) { puts(p); exit(1); } void producer(sem_t * Empty, sem_t * Full,sem_t * Mutex, int shm_id) { int *p; int i,location=0; if((p = (int * )shmat(shm_id, NULL, 0)) == -1) die("link error!"); for(i=0; i #include #include #include #include #include #include #include #define PRODUCE_NUM 800 #define BUFF_SIZE 10 #define SHM_KEY 12345 void die(const char *p) { puts(p); exit(1); } int main(int argn, char* argc[]) { sem_t *semEmpty,*semFull,*semMutex; int shm_id,location = 0, pid; int *p,i; semEmpty = sem_open("Empty",0,0600,BUFF_SIZE); semFull = sem_open("Full", 0,0600, 0); semMutex = sem_open("Mutex",0,0600, 1); if((shm_id = shmget(SHM_KEY, BUFF_SIZE*sizeof(int), IPC_CREAT|0666)) == -1) die("shmget failed!"); printf("%d",shm_id); if((p = (int * )shmat(shm_id, NULL, 0)) == -1) die("link error!"); for(i=0; i #include #include #include #include #define SHM_SIZE 20 typedef struct { unsigned int key; unsigned int size; unsigned long page; }shm_ds; _syscall1(int, shmat, int, shmid); _syscall2(int, shmget, unsigned int, key, size_t, size); ``` shm.c ``` #include static shm_ds shm_ds_list[SHM_SIZE] = {0}; int sys_shmget(unsigned int key, size_t size) { int i; void *page; if(size > PAGE_SIZE) return -EINVAL; page = get_free_page(); if(!page) return -ENOMEM; for(i=0; ibrk + get_base(current->ldt[1]); current->brk += PAGE_SIZE; for(i=0; ibrk - PAGE_SIZE; } } return -1; } ``` 我只按照老师的标准做了两个，没有做释放和删除的函数。你可以加上，也不复杂。其实这最麻烦的地方我觉得在于put_page，但是可以直接点用，想来直接写也是可以的。下面修改相应的 producer.c ``` #include #include #include #include #include #include #define PRODUCE_NUM 800 #define BUFF_SIZE 10 #define SHM_KEY 12345 void die(const char *p) { puts(p); exit(1); } void producer(sem_t * Empty, sem_t * Full,sem_t * Mutex, int shm_id) { int *p; int i,location=0; if((p = (int * )shmat(shm_id)) == -1) die("link error!"); for(i=0; i #include #include #include #include #include #define PRODUCE_NUM 800 #define BUFF_SIZE 10 #define SHM_KEY 12345 void die(const char *p) { puts(p); exit(1); } int main(int argn, char* argc[]) { sem_t *semEmpty,*semFull,*semMutex; int shm_id,location = 0, pid; int *p,i; semEmpty = sem_open("Empty",BUFF_SIZE); semFull = sem_open("Full", 0); semMutex = sem_open("Mutex",1); if((shm_id = shmget(SHM_KEY, BUFF_SIZE*sizeof(int))) == -1) die("shmget failed!"); if((p = (int * )shmat(shm_id)) == -1) die("link error!"); for(i=0; i

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