Threads
Last updated
Last updated
Its a light weight process within a process, which executes a sequence of instructions concurrently in an execution context.
It requires fewer resources.
Its a component of a process, and a process has atleast one thread.
They share the process memory and resources to accomplish a task.
As they share resources, synchronization on read and write operations are important to avoid problems related to memory-inconsistencies, atomicity and visibility, thread-interference.
is the main class that help to create and control the thread while executing.
Threads has following states,
NEW : Not yet started
RUNNABLE : Scheduled for execution or started execution in JVM.
BLOCKED : When a thread is blocked by some other thread as it is waiting for monitor lock. This happens when a thread tries to enter a critical code section but is being blocked as other thread has monitor lock.
WAITING : Thread enters this state when waiting for monitor or awaiting other threads execution completion. Calling wait(), join() and park() will take a thread to this state.
TIMED_WAITING : This takes thread to waiting state for specified time. Calling wait(time), sleep(time), join(time), parkNanos() and parkUntil() will take a thread to this state.
TERMINATED : End of thread. By calling exit() or unhandled exception or interrupted by calling interrupt().