When a signal happens on a condition variable that at least one other thread is waiting on, there are at least two threads that could then occupy the monitor: the thread that signals and any one of the threads that is waiting.
In order that at most one thread occupies the monitor at each time, a choice must be made.
Continue reading: Monitors in concurrent computing – 3 of 3
acquire(m); // Acquire this monitor's lock.
while (!p) { // While the condition/predicate/assertion that we are waiting for is not true...
wait(m, cv); // Wait on this monitor's lock and condition variable.
}
// ... Critical section of code goes here ...
signal(cv2); //-- OR -- notifyAll(cv2); cv2 might be the same as cv or different.
release(m); // Release this monitor's lock.
A monitor is a synchronization construct that allows threads to have both mutual exclusion and the ability to wait (block) for a certain condition to become true.
Monitors also have a mechanism for signaling other threads that their condition has been met.
Continue reading: Monitors in concurrent computing – 1 of 3
On the T-800’s head-up display, the assembly code is based on the 6502 8-bit microprocessor so either James Cameron wanted the Terminator from 2029 to be running on Apple II or perhaps Cyberdyne Systems itself chose Apple II for their model 101 series 800 Terminators which probably seemed cool back in 1984 but not anymore and certainly it cannot be running on vintage Apple II in 2029 unless Steve Jobs reincarnated himself and launched upgraded series of Apple computers to beat OS X using 6502. The scene occurs about 60 minutes into the movie.
Apache log4j is one of several Java logging frameworks and is very popular among Java based applications as it follows the asynchronous logging mechanism which boost the over-all logging performance. log4j 2 makes use of the LMAX Disruptor, a high performance inter-thread messaging library, which reduces the need for kernel logging. Continue reading: How to override log4j properties at runtime