?? lock2.c
字號:
#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <fcntl.h>#include <errno.h>const char *lock_file = "/tmp/LCK.test2";int main() { int file_desc; int tries = 10; while (tries--) { file_desc = open(lock_file, O_RDWR | O_CREAT | O_EXCL, 0444); if (file_desc == -1) { printf("%d - Lock already present\n", getpid()); sleep(3); } else { /* critical region */ printf("%d - I have exclusive access\n", getpid()); sleep(1); (void)close(file_desc); (void)unlink(lock_file); /* non-critical region */ sleep(2); } } /* while */ exit(EXIT_SUCCESS);}
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -