这个我在vim下用C++11编译,不会发生死锁,请问是什么原因

godop 2018-05-26 08:01:41
  
2
3 #include<vector>
4 #include<algorithm>
5 #include<iostream>
6 #include<cstdio>
7 #include<cstdlib>
8 #include<cstring>
9 #include<mutex>
10 using namespace std;
11 mutex g_lock;
12 struct Com{
13 int i;
14 Com():i(1){}
15
16 void mul(int x){
17 lock_guard<mutex>lock(g_lock);
18 i*=x;
19 cout<<i<<endl;
20 }
21 void div(int y){
22 lock_guard<mutex>lock(g_lock);
23 i*=y;
24 cout<<i<<endl;
25 }
26 void both(int x,int y){
27 lock_guard<mutex>lock(g_lock);
28 mul(x) ;
29 div(y);
30 }
31 };
32 int main(){
33 Com c;
34 c.both(2,3);
35 return 0;
36 }
<threadpool/mutex.cpp [FORMAT=unix] [TYPE=CPP] [POS=36,2][100%] 26/05/18 - 20:06

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请问我用vim写这个,没有发生死锁是为什么?在windows下用dev是会发生死锁的
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赵4老师 2018-05-28
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仅供参考:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
    #include <windows.h>
    #include <io.h>
    #include <process.h>
    #define  MYVOID             void
#else
    #include <unistd.h>
    #include <sys/time.h>
    #include <pthread.h>
    #define  CRITICAL_SECTION   pthread_mutex_t
    #define  _vsnprintf         vsnprintf
    #define  MYVOID             void *
#endif
//Log{
#define MAXLOGSIZE 20000000
#define ARRSIZE(x) (sizeof(x)/sizeof(x[0]))
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
char logstr[16000];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
#ifdef WIN32
void Lock(CRITICAL_SECTION *l) {
    EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
    LeaveCriticalSection(l);
}
void sleep_ms(int ms) {
    Sleep(ms);
}
#else
void Lock(CRITICAL_SECTION *l) {
    pthread_mutex_lock(l);
}
void Unlock(CRITICAL_SECTION *l) {
    pthread_mutex_unlock(l);
}
void sleep_ms(int ms) {
    usleep(ms*1000);
}
#endif
void LogV(const char *pszFmt,va_list argp) {
    struct tm *now;
    struct timeb tb;


    if (NULL==pszFmt||0==pszFmt[0]) return;
    if (-1==_vsnprintf(logstr,ARRSIZE(logstr),pszFmt,argp)) logstr[ARRSIZE(logstr)-1]=0;
    ftime(&tb);
    now=localtime(&tb.time);
    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );
    sprintf(mss,"%03d",tb.millitm);
    printf("%s %s.%s %s",datestr,timestr,mss,logstr);
    flog=fopen(logfilename1,"a");
    if (NULL!=flog) {
        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
        if (ftell(flog)>MAXLOGSIZE) {
            fclose(flog);
            if (rename(logfilename1,logfilename2)) {
                remove(logfilename2);
                rename(logfilename1,logfilename2);
            }
            flog=fopen(logfilename1,"a");
            if (NULL==flog) return;
        }
        fclose(flog);
    }
}
void Log(const char *pszFmt,...) {
    va_list argp;

    Lock(&cs_log);
    va_start(argp,pszFmt);
    LogV(pszFmt,argp);
    va_end(argp);
    Unlock(&cs_log);
}
//Log}
static int volatile No_Loop=0;
static int volatile gLock = 0;
static int volatile gCounter = 0;
MYVOID testThread(void *pcn) {
    int n,i;

    n=(int)pcn;
    while (1) {
        if (No_Loop==2) {
            for (i = 0; i < 1000000; ) {
                //以下代码无效
//              if ( 0 == gLock ) {
//                  gLock = n;
//                  if( gLock == n ) {
//                      ++i;
//                      ++gCounter;
//                      //if (i%100000==0) Log("%d %d\n",n,gCounter);
//                      gLock = 0;
//                      //if (i%100000==0) sleep_ms(10*(rand()%50));
//                      continue;
//                  } else sleep_ms(100);
//              } else sleep_ms(100);

                //应改为以下代码
                InterlockedCompareExchange((void **)&gLock, (void *)n, 0);
                if( gLock == n ) {
                    ++i;
                    ++gCounter;
                    if (i%100000==0) Log("%d %d\n",n,gCounter);
                    InterlockedExchange((long *)&gLock, 0);
                    if (i%100000==0) sleep_ms(10*(rand()%50));
                    continue;
                } else sleep_ms(100);
            }
            sleep_ms(1000);
            No_Loop=1;
        }
    }
}
int main(int argc,char * argv[]) {
    int i;
	srand(time(NULL));
#ifdef WIN32
    InitializeCriticalSection(&cs_log);
#else
    pthread_mutex_init(&cs_log,NULL);
    pthread_t threads[4];
//  void *thread_result;
    int threadsN;
    int rc;
#endif
    Log("=========BEGIN==================\n");
#ifdef WIN32
    _beginthread((void(__cdecl *)(void *))testThread,0,(void *)1);
    _beginthread((void(__cdecl *)(void *))testThread,0,(void *)2);
    _beginthread((void(__cdecl *)(void *))testThread,0,(void *)3);
    _beginthread((void(__cdecl *)(void *))testThread,0,(void *)4);
#else
    threadsN=0;
    rc=pthread_create(&(threads[threadsN++]),NULL,testThread,(void *)1);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
    rc=pthread_create(&(threads[threadsN++]),NULL,testThread,(void *)2);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
    rc=pthread_create(&(threads[threadsN++]),NULL,testThread,(void *)3);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
    rc=pthread_create(&(threads[threadsN++]),NULL,testThread,(void *)4);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
#endif
    sleep_ms(1000);
    No_Loop=2;
    i=0;
    while (1) {
        sleep_ms(1000);
        if (No_Loop==1) break;//
    }
    sleep_ms(1000);
    Log("Result: %d\n",gCounter);
    Log("=========END====================\n");
#ifdef WIN32
    DeleteCriticalSection(&cs_log);
#else
    pthread_mutex_destroy(&cs_log);
#endif
    return 0;
}
ztenv 版主 2018-05-28
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和工具没关系,和平台有关系;你用不同的线程调一下试试
paschen 版主 2018-05-26
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没发生证明不了什么,最多就算运气好

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