{//do the second thing for share memorywhile(1) { printf("input str to share memory:"); gets(shmptr);if(shmptr[0] =='q')//quit{ shmdt(shmptr);//disconnect to the share memory but will not dellect the memerybreak; } } }else{while(1) { sleep(2); printf("share memory is:...
使用函数shmat(SHared Memory ATtach),参数传入通过shmget返回的共享内存id即可: shared_memory = (char*) shmat (segment_id, 0, 0); shmat返回映射到进程虚拟地址空间的地址指针,这样进程就能像访问一块普通的内存缓冲一样访问共享内存。例子中后两个参数我们全部传入0,采用默认的连接方式。实际上,第二个参数是...
IPC_RMID:删除这片共享内存(因为buf没用,可以填0) /* Data structure describing a shared memory segment. */ struct shmid_ds { struct ipc_perm shm_perm; /* operation permission struct */ #if !__SHM_SEGSZ_AFTER_TIME size_t shm_segsz; /* size of segment in bytes */ #endif __SHM_PAD...
// create a share memory int shmid = shmget(key, 8, IPC_CREAT|0666|IPC_EXCL); if(shmid == -1) { perror("shmget failed\n"); exit(1); } printf("shmid=%#x\n", shmid); // map share memory to get the virtual address void *p = shmat(shmid, 0, 0); if((void *)-1 == ...
// share_read2.cc#include<stdio.h>#include<errno.h>#include<sys/ipc.h>#include<sys/shm.h>#include"common.h"intmain(){key_tkey=(key_t)SHARE_MEMORY_KEY_DEMO1;intsize=4096;intshmid;char*shmaddr=NULL;// get 共享内存,没有则创建共享内存shmid=shmget(key,size,0644|IPC_CREAT);if(shmid...
通过share memory 取对象的例子, c write object into memory map, python read it by call dll api.So there still questions you should consider how to guarantee the process share security. Good luck..---python part--- from ctypes import windll.kernel32.SetLastError(-100)print win...
In the previous post, I looked at how global memory accesses by a group of threads can be coalesced into a single transaction, and how alignment and stride…
$ gcc ipc_share_mem_read.c -o ipc_share_mem_read $ touch /dev/shm/myshm2 # 在两个终端分别执行程序即可。 可以使用free命令查看执行前后共享内存空间的变化情况: [root@criu_go ~]# free total used free shared buff/cache available Mem: 3880732 3193512 421660 9216 265560 461624 ...
\n";intfd=0;void*ptr=NULL;intret=0;fd=shm_open(SHARE_MEMORY,O_CREAT|O_TRUNC|O_RDWR,0666);if(fd==-1){error_and_die("shm open");}ret=ftruncate(fd,region_size);if(ret){error_and_die("ftruncate");}printf("region_size=%d\n",region_size);ptr=mmap(0,region_size,PROT_READ|...
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