Worked out networking

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

diff --git a/judge/manager/program.cpp b/judge/manager/program.cpp
index d5463f4..031d411 100644 (file)
--- a/judge/manager/program.cpp
+++ b/judge/manager/program.cpp
@@ -20,7 +20,7 @@ using namespace std;
  *     The child process closes unused sides of the pipe, and then calls exec to replace itself with the AI program
  *     The parent process closes unused sides of the pipe, and sets up member variables - associates streams with the pipe fd's for convenience.
  */
  *     The child process closes unused sides of the pipe, and then calls exec to replace itself with the AI program
  *     The parent process closes unused sides of the pipe, and sets up member variables - associates streams with the pipe fd's for convenience.
  */

-Program::Program(const char * executablePath) : input(NULL), output(NULL), pid(0)
+Program::Program(const char * executablePath) : input(NULL), output(NULL), pid(0), paused(false)

 {
        //See if file exists and is executable...
        if (access(executablePath, X_OK) != 0)
 {
        //See if file exists and is executable...
        if (access(executablePath, X_OK) != 0)


@@ -100,8 +100,42 @@ Program::~Program()
        
 }
 
        
 }
 

+/**
+ * Forces the program to pause by sending SIGSTOP
+ * Program can be resumed by calling Continue() (which sends SIGCONT)
+ * @returns true if the program could be paused, false if it couldn't (probably because it wasn't running)
+ */
+bool Program::Pause()
+{
+       if (pid > 0 && kill(pid,SIGSTOP) == 0)
+       {
+               paused = true;
+               return true;
+       }
+       return false;
+}

 
 

+/**
+ * Causes a paused program to continue
+ * @returns true if the program could be continued, false if it couldn't (probably because it wasn't running)
+ */
+bool Program::Continue()
+{
+       if (pid > 0 && kill(pid,SIGCONT) == 0)
+       {
+               paused = false;
+               return true;
+       }
+       return false;
+}

 
 

+/**
+ * @returns true iff the program is paused
+ */
+bool Program::Paused() const
+{
+       return paused;
+}

 
 
 /**
 
 
 /**