Subj : thread safe of time()
To   : comp.programming.threads
From : Da Wang
Date : Tue Feb 22 2005 09:50 pm

Hi, I am using POSIX threads lib and work on sun sparc machine:
in my code i need to get the system date and I wrote the following code. 
  I am wondering whether the statement "time(&rawtime)" is thread safe 
or not. If it is not safe, how to solve that problem? Thanks.
---------
char*
getLocalTime()
{
   char *localtm;
   time_t rawtime;
   struct tm *timeinfo;
   timeinfo=(struct tm*)malloc(sizeof(struct tm));
   localtm=(char*)malloc(sizeof(char)*27);

   time(&rawtime);
   timeinfo=localtime_r(&rawtime,timeinfo);
   if (timeinfo==NULL){
     perror("localtime_r()--Cannot get system time. ServerExit");
     exit(2);
   }
   localtm=asctime_r(timeinfo,localtm,26);
   if (localtm==NULL){
     perror("asctime_r()--Cannot get system time. Server Exit");
     exit(2);
   }

   free(timeinfo);
   return localtm;
}

.