On x86, any lock-prefixed instruction can be used as a StoreLoad barrier. (The form used in linux kernels is the no-op lock; addl $0,0(%%esp).) Versions supporting the "SSE2" extensions (Pentium4 and later) support the mfence instruction which seems preferable unless a lock-prefixed ...
The ‘volatile’ keyword forces the compiler to store a variable in memory each time it’s written, and to load it from memory each time it’s read. This ensures that the exponent is constrained to the double-precision range; a number that is too large for double-precision will overflow,...
While the cost of synchronization in Java is decreasing as the platform matures, it will never be free. A simple trick can be used to remove the synchronization that we've added to each iteration of the "run loop." The synchronized block that was added is replaced by a slightly more comp...
private volatile boolean run = true; public void instanceVariableMultithreading() { executor.execute(() -> { while (run) { // do operation } }); run = false; } Therunvariable is now visible to the lambda even when it’s executed in another thread since we added thevolatilekeyword. Gen...
check this variable regularly, and return from its run method in an orderly fashion if the variable indicates that it is to stop running. To ensure prompt communication of the stop-request, the variable must be volatile (or access to the variable ...
Note that some languages expose this functionality with the “volatile” keyword: be very careful as this meaning of volatile is distinct from its meaning in C and C++. If a language does offer atomic variables it probably adds the fences implicitly in the reading and writing of those atomic ...
The obvious problem highlighted here is that this simple approach accidentally allocated risk very unevenly. The performance of such a portfolio will be driven by the volatile stocks. AAPL would have more than double actual risk than IBM. By thinking of risk in terms of exposure and leverage, ...
EDSFF allows for a 10x increase in storage density while still using the Gen3 NVMe (Non-Volatile Memory Express) standard for communication, which is faster than SAS3 (Serial Attached SCSI). Higher data densities can be achieved with 3.5” SAS/SATA drives, but that higher data density is ...
Compared to that in notoginseng, the total content of amino acid in ginseng is higher. The difference in the contents of the various amino acids may be related to the different regions, harvest times, and different parts of the plants. 3.4. Volatile oil The chemical composition of volatile ...
Java virtual machine is killed, or the operating system crashes or reboots, events that were not successfully transferred to the next agent in the pipeline will still be there when the Flume agent is restarted. The memory channel is a volatile channel, as it buffers events in memory only: ...