[PATCH] Fixed efficiency problem with manager program

[progcomp2012.git] / judge / manager / program.cpp

diff --git a/judge/manager/program.cpp b/judge/manager/program.cpp
index 02c9cb8..5ea1591 100644 (file)
--- a/judge/manager/program.cpp
+++ b/judge/manager/program.cpp
@@ -10,6 +10,12 @@
 #include <string.h>
 #include <stdio.h>
 
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+
 using namespace std;
 
 
@@ -60,7 +66,7 @@ Program::Program(const char * executablePath) : input(NULL), output(NULL), pid(0
        char **  arguments = NULL;
         if (args.size() > 0)
        {
-               arguments = new char*[args.size()+2];
+               arguments = new char*[args.size()];
                for (unsigned int i=0; i < args.size(); ++i)
                        arguments[i] = args[i];
        }
@@ -221,6 +227,31 @@ bool Program::GetMessage(string & buffer, double timeout)
        if (!Running() || timeout == 0)
                return false;
 
+       struct timeval tv;
+       fd_set readfds;
+       
+       tv.tv_sec = (int)(timeout);
+       tv.tv_usec = (timeout - (double)((int)timeout)) * 1000000;
+       
+       int fd = fileno(input);
+
+       FD_ZERO(&readfds);
+       FD_SET(fd, &readfds);
+
+       select(fd+1, &readfds, NULL, NULL, &tv);
+
+       if (!FD_ISSET(fd, &readfds))
+               return false; //Timed out
+       //fprintf(stderr, "Got message!\n");
+       for (char c = fgetc(input); c != '\n' && (int)(c) != EOF; c = fgetc(input))
+       {       
+               //fprintf(stderr, "%c", c);
+               buffer += c;
+       }
+       //fprintf(stderr, "%s\n", buffer.c_str());
+       return true;
+
+       /* Old way, using threads, which apparently is terrible
        assert(&buffer != NULL);
        GetterThread getterThread(input, buffer);
        assert(&(getterThread.buffer) != NULL);
@@ -251,7 +282,7 @@ bool Program::GetMessage(string & buffer, double timeout)
        if (buffer.size() == 1 && buffer[0] == EOF)
                return false;
        return true;
-
+       */
 
 }