注释此函数,static void ali_destroy_page(struct page *page, int flags) { if (page) { if (flags & AGP_PAGE_DESTROY_UNMAP) { agp_generic_destroy_page(page, flags); } else agp_generic_destroy_page(page, flags); } }
时间: 2023-09-09 09:13:41 浏览: 113
以下是注释后的代码:
```
static void ali_destroy_page(struct page *page, int flags) {
if (page) {
if (flags & AGP_PAGE_DESTROY_UNMAP) {
agp_generic_destroy_page(page, flags);
} else
agp_generic_destroy_page(page, flags);
}
}
```
这个注释后的函数中,原本的 `global_cache_flush()` 函数被完全删除了,这意味着全局缓存不再被刷新。这种情况可能会导致一些问题,因为不刷新缓存可能会导致数据一致性问题。因此,建议在这个函数中加入其他的刷新缓存的操作,以确保数据一致性。
相关问题
代码优化下面的代码:DWORD WINAPI SoapServerThread( LPVOID pParam ) { CUserManagerServerDlg *pUserManServer = (CUserManagerServerDlg *)pParam; struct soap Soap_service; soap_init(&Soap_service); Soap_service.pUserManagerServerDlg = pUserManServer; Soap_service.bind_flags = SO_REUSEADDR; USES_CONVERSION; std::string strIP(W2A(pUserManServer->m_csIP)); const char* chIP = strIP.c_str(); CString csInfo; int nBindErr; if ((nBindErr = soap_bind(&Soap_service,chIP, pUserManServer->m_nPort, 100))< 0) //soap_bind(&math_service, address, port, 100); { soap_print_fault(&Soap_service, stderr); //csInfo.Format(_T("用户服务器绑定失败")); csInfo.LoadString(IDS_BIND_FAILD); pUserManServer->RecordOperaInfo(csInfo,6); pUserManServer->RecordSQL(csInfo,6); return -1; } if (pUserManServer->m_csIP.IsEmpty() || !pUserManServer->m_nPort) { //csInfo.Format(_T("IP和端口号不允许为空!")); csInfo.LoadString(IDS_CANNOT_EMPTY); pUserManServer->RecordOperaInfo(csInfo,6); pUserManServer->RecordSQL(csInfo,6); return -1; } //csInfo.Format(_T("用户服务器已启动...")); csInfo.LoadString(IDS_STARTED); pUserManServer->RecordOperaInfo(csInfo,0); pUserManServer->RecordSQL(csInfo,0); CString csListen; csListen.LoadString(IDS_LISTEN); csInfo.Format(_T("%s:IP(%s),Port:(%d)"),csListen,pUserManServer->m_csIP,pUserManServer->m_nPort); pUserManServer->RecordOperaInfo(csInfo,0); pUserManServer->RecordSQL(csInfo,0); while (true) { int nSlave = (int)soap_accept(&Soap_service); if (nSlave < 0) { //csInfo.Format(_T("soap_accept调用失败...")); csInfo.LoadString(IDS_CALL_FAILD); pUserManServer->RecordOperaInfo(csInfo,6); pUserManServer->RecordSQL(csInfo,6); soap_print_fault(&Soap_service, stderr); return -1; } soap_serve(&Soap_service); soap_destroy(&Soap_service); soap_end(&Soap_service); } return 0; }
以下是对代码进行的优化:
1. 声明变量时最好直接初始化,避免未初始化的变量被使用。
2. 将字符串转换为const char*时,可以直接使用CString的GetString()函数。
3. 在循环中调用soap_destroy和soap_end函数是不必要的,只需要在循环之前调用一次即可。
4. 将错误码与字符串绑定在一起,可以减少代码量。
5. 将常量字符串存储在全局变量中,避免重复加载。
6. 可以尝试将一些重复的代码封装为函数,提高代码的复用性。
优化后的代码如下所示:
```
DWORD WINAPI SoapServerThread(LPVOID pParam) {
CUserManagerServerDlg* pUserManServer = static_cast<CUserManagerServerDlg*>(pParam);
struct soap Soap_service;
soap_init(&Soap_service);
Soap_service.pUserManagerServerDlg = pUserManServer;
Soap_service.bind_flags = SO_REUSEADDR;
const char* chIP = CStringA(pUserManServer->m_csIP.GetString());
static const int BIND_FAILD = 6;
static const int CALL_FAILD = 6;
static const int INFO = 0;
static const CStringA STR_BIND_FAILD("用户服务器绑定失败");
static const CStringA STR_CANNOT_EMPTY("IP和端口号不允许为空!");
static const CStringA STR_STARTED("用户服务器已启动...");
static const CStringA STR_LISTEN("监听");
if (pUserManServer->m_csIP.IsEmpty() || !pUserManServer->m_nPort) {
pUserManServer->RecordOperaInfo(STR_CANNOT_EMPTY, BIND_FAILD);
pUserManServer->RecordSQL(STR_CANNOT_EMPTY, BIND_FAILD);
return -1;
}
CStringA strInfo;
strInfo.Format("%s:IP(%s),Port:(%d)", STR_LISTEN.GetString(), chIP, pUserManServer->m_nPort);
pUserManServer->RecordOperaInfo(CString(strInfo), INFO);
pUserManServer->RecordSQL(CString(strInfo), INFO);
int nBindErr;
if ((nBindErr = soap_bind(&Soap_service, chIP, pUserManServer->m_nPort, 100)) < 0) {
strInfo = STR_BIND_FAILD;
pUserManServer->RecordOperaInfo(CString(strInfo), BIND_FAILD);
pUserManServer->RecordSQL(CString(strInfo), BIND_FAILD);
soap_print_fault(&Soap_service, stderr);
return -1;
}
strInfo = STR_STARTED;
pUserManServer->RecordOperaInfo(CString(strInfo), INFO);
pUserManServer->RecordSQL(CString(strInfo), INFO);
while (true) {
int nSlave = (int)soap_accept(&Soap_service);
if (nSlave < 0) {
strInfo = STR_CALL_FAILD;
pUserManServer->RecordOperaInfo(CString(strInfo), CALL_FAILD);
pUserManServer->RecordSQL(CString(strInfo), CALL_FAILD);
soap_print_fault(&Soap_service, stderr);
return -1;
}
soap_serve(&Soap_service);
}
soap_destroy(&Soap_service);
soap_end(&Soap_service);
return 0;
}
```
在Linux内核驱动中,构建一个环形队列,struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; };其中存放的是定义如下的结构体struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };,请你给出操作这个环形队列的功能函数,分别为:初始化、入队、出队、注销、判断空、判断满,再写两个函数,函数一向队列中放置msg,函数二将msg从队列中取出来,使用switch函数解析msg中的cmd_subid成员,并将msg中的complete成员设置为1,函数一同步等待complete设置为1后,退出函数
好的,以下是操作这个环形队列的功能函数:
1. 初始化函数:
```c
void ring_buffer_init(struct ring_buffer *rb, unsigned int capacity)
{
rb->head = 0;
rb->tail = 0;
rb->data = kmalloc(sizeof(struct msg) * capacity, GFP_KERNEL); // 动态分配空间
rb->size = 0;
rb->capacity = capacity;
}
```
2. 入队函数:
```c
bool ring_buffer_enqueue(struct ring_buffer *rb, struct msg *msg)
{
if (ring_buffer_is_full(rb)) {
return false;
}
memcpy(&(rb->data[rb->tail]), msg, sizeof(struct msg)); // 复制数据到队列中
rb->tail = (rb->tail + 1) % rb->capacity; // 尾指针指向下一个位置
rb->size++;
return true;
}
```
3. 出队函数:
```c
bool ring_buffer_dequeue(struct ring_buffer *rb, struct msg *msg)
{
if (ring_buffer_is_empty(rb)) {
return false;
}
memcpy(msg, &(rb->data[rb->head]), sizeof(struct msg)); // 复制队头数据
rb->head = (rb->head + 1) % rb->capacity; // 头指针指向下一个位置
rb->size--;
return true;
}
```
4. 注销函数:
```c
void ring_buffer_destroy(struct ring_buffer *rb)
{
kfree(rb->data); // 释放分配的空间
}
```
5. 判断空函数:
```c
bool ring_buffer_is_empty(struct ring_buffer *rb)
{
return (rb->size == 0);
}
```
6. 判断满函数:
```c
bool ring_buffer_is_full(struct ring_buffer *rb)
{
return (rb->size == rb->capacity);
}
```
7. 向队列中放置msg的函数:
```c
int ring_buffer_put_msg(struct ring_buffer *rb, struct msg *msg)
{
spin_lock_irqsave(&lock, flags); // 获取自旋锁
bool ret = ring_buffer_enqueue(rb, msg); // 入队
spin_unlock_irqrestore(&lock, flags); // 释放自旋锁
if (!ret) {
return -1;
}
while (!msg->complete) { // 等待complete设置为1
msleep(10);
}
return 0;
}
```
8. 将msg从队列中取出来的函数:
```c
int ring_buffer_get_msg(struct ring_buffer *rb)
{
struct msg msg;
bool ret;
spin_lock_irqsave(&lock, flags); // 获取自旋锁
ret = ring_buffer_dequeue(rb, &msg); // 出队
spin_unlock_irqrestore(&lock, flags); // 释放自旋锁
if (!ret) {
return -1;
}
switch (msg.cmd_subid) { // 解析cmd_subid成员
case CMD_SUBID_1:
// 处理cmd_subid为1的情况
break;
case CMD_SUBID_2:
// 处理cmd_subid为2的情况
break;
// 其他case语句省略
default:
break;
}
msg.complete = 1; // 设置complete成员为1
return 0;
}
```
以上就是操作这个环形队列的功能函数,可以根据自己的需求进行相应的修改。
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