标签:map bckupProgress AddrecordBckProgress 更新 finally value backupid progress
原因:本来想直接通过插入更新同一key对应的value发现覆盖不了。
实现:
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <map>
using namespace std;
static pthread_mutex_t mtxBckLoadProgress = PTHREAD_MUTEX_INITIALIZER;
typedef std::map<int,float> mapBackupprogress; //存放备份进度消息
mapBackupprogress rdMapbckupProgress;
void AddrecordBckProgress(int backupid, float progress)
{
pthread_mutex_lock(&mtxBckLoadProgress);
printf("backupid: %d, progress: %f.\n",backupid ,progress);
map< int ,float >::iterator it = rdMapbckupProgress.find( backupid );
if (it != rdMapbckupProgress.end())
{
/*,如果map里面插入之前的<key, value>,如果key在map里面有的话,不会覆盖之前的value,一般先判断之前有没有数据,有的话先删除,然后再去添加*/
rdMapbckupProgress.erase(it);
rdMapbckupProgress.insert(std::make_pair( backupid, progress));
printf("[AddrecordBckProgress]:Already Find backupid: %d progress:%f update from map.\n",backupid,progress);
}
else{
rdMapbckupProgress.insert(std::make_pair( backupid, progress));//如果map不存在插入新的
printf( "[AddrecordBckProgress]:instert new bckupProgress backupid: %d, progress: %f.\n", it->first, it->second);
}
it = rdMapbckupProgress.begin();
for(;it != rdMapbckupProgress.end();it++)
{
printf("[AddrecordBckProgress]:finally bckupProgress!!! backupid: %d, progress: %f.\n", it->first, it->second);
}
pthread_mutex_unlock(&mtxBckLoadProgress);
return ;
}
int recordGetBackuploadprogress(int inkey)
{
int ret = -1;
//Json::Value root;
//AutoMutexLck lck(&mtxBckLoadProgress); // 如不是嵌套锁,请注意锁死问题
pthread_mutex_lock(&mtxBckLoadProgress);
map< int ,float >::iterator it = rdMapbckupProgress.find( inkey );
if (it != rdMapbckupProgress.end())
{
//root["backupid"] = it->first;
//root["progress"] = it->second;
//result = root.toStyledString().c_str();
printf( "[recordGetBackuploadprogress]:recordGetBackuploadprogress backupid: %d, progress: %f.\n", it->first, it->second);
ret = 0;
}
else{
printf("[recordGetBackuploadprogress]:Find backupid: %d progress fialed from map.\n",inkey);
}
pthread_mutex_unlock(&mtxBckLoadProgress);
return ret;
}
int main()
{
float count = 1.03;
while(1)
{
AddrecordBckProgress(1,count);
count++;
sleep(1);
if(count >= 10)
break;
}
recordGetBackuploadprogress(1);
printf("main exit....\n");
return 0;
}
运行结果
huqin@ubuntu:~/Demo$ g++ map.cpp -o map
huqin@ubuntu:~/Demo$ ./map
backupid: 1, progress: 1.030000.
[AddrecordBckProgress]:instert new bckupProgress backupid: 1, progress: 0.000000.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 1.030000.
backupid: 1, progress: 2.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:2.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 2.030000.
backupid: 1, progress: 3.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:3.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 3.030000.
backupid: 1, progress: 4.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:4.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 4.030000.
backupid: 1, progress: 5.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:5.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 5.030000.
backupid: 1, progress: 6.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:6.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 6.030000.
backupid: 1, progress: 7.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:7.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 7.030000.
backupid: 1, progress: 8.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:8.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 8.030000.
backupid: 1, progress: 9.030000.
[AddrecordBckProgress]:Already Find backupid: 1 progress:9.030000 update from map.
[AddrecordBckProgress]:finally bckupProgress!!! backupid: 1, progress: 9.030000.
[recordGetBackuploadprogress]:recordGetBackuploadprogress backupid: 1, progress: 9.030000.
main exit....
标签:map,bckupProgress,AddrecordBckProgress,更新,finally,value,backupid,progress 来源: https://blog.csdn.net/qq_45689245/article/details/123019473
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