v8/test/mjsunit/compiler/manual-concurrent-recompile.js

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// Flags: --allow-natives-syntax --expose-gc
// Flags: --concurrent-recompilation --block-concurrent-recompilation
// Flags: --opt --no-always-opt

if (!%IsConcurrentRecompilationSupported()) {
  print("Concurrent recompilation is disabled. Skipping this test.");
  quit();
}

function f(x) {
  var xx = x * x;
  var xxstr = xx.toString();
  return xxstr.length;
};
%PrepareFunctionForOptimization(f);
function g(x) {
  var xxx = Math.sqrt(x) | 0;
  var xxxstr = xxx.toString();
  return xxxstr.length;
};
%PrepareFunctionForOptimization(g);
function k(x) {
  return x * x;
}

f(g(1));
f(g(2));
assertUnoptimized(f);
assertUnoptimized(g);

%OptimizeFunctionOnNextCall(f, "concurrent");
%OptimizeFunctionOnNextCall(g, "concurrent");
f(g(3));  // Kick off recompilation.

assertUnoptimized(f, 'no sync');  // Not yet optimized since recompilation
assertUnoptimized(g, 'no sync');  // is still blocked.

// Let concurrent recompilation proceed.
%UnblockConcurrentRecompilation();

assertOptimized(f, 'sync');  // Optimized once we sync with the
assertOptimized(g, 'sync');  // background thread.