Example: Working with threads

The follwing thread functions can be used to work with system threads. On Linux posix threads will be created.

<?php <?v1

function myThreadFunction (param)  {
  print ("I am running and got the param ", param);
}

// Create new thread
param = 1;
t = thread_create ("myThreadFunction", param); 
thread_start (t, false); // false = dont wait until the thread is running
thread_join (t); // Wait until the thread is finished

?>

Example: Send a signal to a thread.

<?php <?v1

function myThreadFunction (param)  {
  print ("I am running and got the param ", param);
  thread_wait (); // Wait until a thread_signal() accours
  print ("I am awake");
}

// Create new thread
param = 1;
t = thread_create ("myThreadFunction", param); 
thread_start (t);

sleep (1000); // Wait 1000 milliseconds
thread_signal (t); // Signal the thread to weakup
thread_join (t);  // Wait until the thread is finished

?>

Example: Synchronize a global variable by different threads.

<?php <?v1

globalVar = 0;
threadIdList = [];

function myThreadFunction () {
  // Threads can only write global variables, reference parameters are not possible
  global globalVar;

  for (i=0;i<1000;i++) {
    thread_sync_enter ();

    // This variale has exclusive access by current thread because it is within thread_sync_enter() and thread_sync_leave()
    globalVar = time ();
    print ("gobalVar = ", globalVar);

    thread_sync_leave ();  
  }
}

// Create many threads
for (threadIdx=0;threadIdx<10;threadIdx++) {
  threadIdList[threadIdx] = thread_create ("myThreadFunction");
  thread_start (threadIdList[threadIdx]);
}

// Wait until all threads are finished
for (threadIdx=0;threadIdx<10;threadIdx++) {
  if (threadIdList[threadIdx])
    thread_join (threadIdList[threadIdx]);
}

?>

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