In multithreaded applications, usinglseek()in conjunction with aread(2)orwrite(2)call on a file descriptor shared by more than one thread is not an atomic operation. To ensure atomicity, usepread()orpwrite(). ATTRIBUTES Seeattributes(5)for descriptions of the following attributes: ...
&retval);break;/* Even more system calls will go here */default: kprintf("Unknown syscall %d\n", callno); err = ENOSYS;break; }if(err) {/* * Return the error code. This gets converted at * userlevel to a return value of -1 and the error * code in errno. */tf->tf_v0 =...
res = f_read(&fil, txmsg.data8,8, &count);if(res !=0|| (i ==0&& count ==0))break;memset(txmsg.data8 + count,0xFF,8- count); canTransmit(&CAND1,1, &txmsg,100);// 1 mailbox, must send in-order!// don't call echoToBridge for these bulk transfers} } f_close(&fil...
strategy模式:该模式用于客户代码在“无知”状态下,可以使用种种不同的实现。...我们在最初已经封装好ngx_os_io_t接口了,客户代码都是这么直接使用的。...但是,在我们理解桥模式时,这些子类暂时要被看成是event module的实例。...在C语言中,往往都是通过几个函数指针,或者void*指针实现各种封装和多态。没有...