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Viewing file:     scheduler.js (1.29 KB)      -rw-r--r--

var queue = [];
/**
  Variable to hold a counting semaphore
  - Incrementing adds a lock and puts the scheduler in a `suspended` state (if it's not
    already suspended)
  - Decrementing releases a lock. Zero locks puts the scheduler in a `released` state. This
    triggers flushing the queued tasks.
**/
var semaphore = 0;

/**
  Executes a task 'atomically'. Tasks scheduled during this execution will be queued
  and flushed after this task has finished (assuming the scheduler endup in a released
  state).
**/
function exec(task) {
  try {
    suspend();
    task();
  } finally {
    release();
  }
}

/**
  Executes or queues a task depending on the state of the scheduler (`suspended` or `released`)
**/
export function asap(task) {
  queue.push(task);

  if (!semaphore) {
    suspend();
    flush();
  }
}

/**
  Puts the scheduler in a `suspended` state. Scheduled tasks will be queued until the
  scheduler is released.
**/
export function suspend() {
  semaphore++;
}

/**
  Puts the scheduler in a `released` state.
**/
function release() {
  semaphore--;
}

/**
  Releases the current lock. Executes all queued tasks if the scheduler is in the released state.
**/
export function flush() {
  release();

  var task = void 0;
  while (!semaphore && (task = queue.shift()) !== undefined) {
    exec(task);
  }
}