本文整理匯總了Java中com.oracle.java.testlibrary.Utils.getUnsafe方法的典型用法代碼示例。如果您正苦於以下問題：Java Utils.getUnsafe方法的具體用法？Java Utils.getUnsafe怎麽用？Java Utils.getUnsafe使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類com.oracle.java.testlibrary.Utils的用法示例。
在下文中一共展示了Utils.getUnsafe方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: inflateMonitor
import com.oracle.java.testlibrary.Utils; //導入方法依賴的package包/類
/**
* Inflates monitor associated with object {@code monitor}.
* Inflation is forced by entering the same monitor from
* two different threads.
*
* @param monitor monitor to be inflated.
* @return inflated monitor.
* @throws Exception if something went wrong.
*/
public static Object inflateMonitor(Object monitor) throws Exception {
Unsafe unsafe = Utils.getUnsafe();
CyclicBarrier barrier = new CyclicBarrier(2);
Runnable inflatingRunnable = () -> {
unsafe.monitorEnter(monitor);
try {
barrier.await();
barrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
throw new RuntimeException(
"Synchronization issue occurred.", e);
} finally {
unsafe.monitorExit(monitor);
}
};
Thread t = new Thread(inflatingRunnable);
t.start();
// Wait until thread t enters the monitor.
barrier.await();
// At this point monitor will be owned by thread t,
// so our attempt to enter the same monitor will force
// monitor inflation.
Asserts.assertFalse(unsafe.tryMonitorEnter(monitor),
"Not supposed to enter the monitor first");
barrier.await();
t.join();
return monitor;
}
示例2: main
import com.oracle.java.testlibrary.Utils; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
sun.misc.Unsafe unsafe = Utils.getUnsafe();
final int array_size = 128;
final int element_size = 4;
final int magic = 0x12345678;
Random rnd = new Random();
long array = unsafe.allocateMemory(array_size * element_size); // 128 ints
long addr = array + array_size * element_size / 2; // something in the middle to work with
unsafe.putInt(addr, magic);
for (int j = 0; j < 100000; j++) {
if (Tests.int_index(unsafe, addr, 0) != magic) throw new Exception();
if (Tests.long_index(unsafe, addr, 0) != magic) throw new Exception();
if (Tests.int_index_mul(unsafe, addr, 0) != magic) throw new Exception();
if (Tests.long_index_mul(unsafe, addr, 0) != magic) throw new Exception();
{
long idx1 = rnd.nextLong();
long addr1 = addr - (idx1 << 2);
if (Tests.long_index(unsafe, addr1, idx1) != magic) throw new Exception();
}
{
long idx2 = rnd.nextLong();
long addr2 = addr - (idx2 >> 2);
if (Tests.long_index_back_ashift(unsafe, addr2, idx2) != magic) throw new Exception();
}
{
long idx3 = rnd.nextLong();
long addr3 = addr - (idx3 >>> 2);
if (Tests.long_index_back_lshift(unsafe, addr3, idx3) != magic) throw new Exception();
}
{
long idx4 = 0x12345678;
long addr4 = addr - idx4;
if (Tests.int_const_12345678_index(unsafe, addr4) != magic) throw new Exception();
}
{
long idx5 = 0x1234567890abcdefL;
long addr5 = addr - idx5;
if (Tests.long_const_1234567890abcdef_index(unsafe, addr5) != magic) throw new Exception();
}
{
int idx6 = rnd.nextInt();
long addr6 = addr - (idx6 >> 2);
if (Tests.int_index_back_ashift(unsafe, addr6, idx6) != magic) throw new Exception();
}
{
int idx7 = rnd.nextInt();
long addr7 = addr - (idx7 >>> 2);
if (Tests.int_index_back_lshift(unsafe, addr7, idx7) != magic) throw new Exception();
}
{
int idx8 = rnd.nextInt();
long addr8 = addr - (idx8 * 16);
if (Tests.int_index_mul_scale_16(unsafe, addr8, idx8) != magic) throw new Exception();
}
{
long idx9 = rnd.nextLong();
long addr9 = addr - (idx9 * 16);
if (Tests.long_index_mul_scale_16(unsafe, addr9, idx9) != magic) throw new Exception();
}
}
}