Yahoo: US firm’s atomic clock for military use offers precision in extreme temperatures
US firm’s atomic clock for military use offers precision in extreme temperatures
The field of optical atomic clocks, in combination with ultracold atoms, has transformed precision timekeeping and metrology. By utilising laser-cooled atoms confined in optical lattices, researchers ...
Atomic clocks will only see a loss of 1 second in accuracy over a period of 10 million years. They are used in multiple ways, including the GPS in your car. Now researchers have found a way to bypass ...
Phys.org: Ytterbium atomic clock could open a new window on fundamental physics
For the first time, an international team of physicists has successfully harnessed a rare orbital transition in atoms of ytterbium to create a new type of atomic clock that is both highly precise and ...
Morning Overview on MSN: Atomic clocks may probe whether time has a measurable quantum limit
E&T Magazine: Portable atomic clock could keep ships on course without GPS
A portable atomic clock that has been successfully tested at sea could change the future of marine navigation.
AOL: New optical atomic clock is 1,000x more accurate than today's standard
The way time is measured is on the edge of a historic upgrade. At the heart of this change is a new kind of atomic clock that uses light instead of microwaves. This shift means timekeeping could ...
Adelaide University researchers have successfully tested a new type of portable atomic clock at sea for the first time, using technology that could help power the next generation of navigation, ...
A team of researchers in Australia has successfully tested, in real maritime conditions, a new type of portable optical atomic clock, a technology considered essential for the development of the next ...
Add Yahoo as a preferred source to see more of our stories on Google. An Arizona-based company has launched its next generation of low-noise Chip-Scale Atomic Clock (CSAC). Microchip's model SA65-LN ...
MSN: New nuclear clock precision could help redefine the second, researchers say
A string of experiments using thorium-229 nuclei has brought the long-theorized nuclear clock closer to reality, producing frequency measurements stable enough to challenge the atomic clocks that ...
A low-noise chip-scale atomic clock (LN-CSAC), the SA65-LN from Microchip, features a profile height of less than 0.5 in. (12.7 mm). Aimed at aerospace and defense applications where size, weight, and ...
Government Technology: How an Atomic Space Clock Could Help Chart Land on Earth
MIT Technology Review: A new atomic clock in space could help us measure elevations on Earth
The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these measurements far more accurate. In 2003, engineers from Germany and ...
A new atomic clock in space could help us measure elevations on Earth
Gizmodo: Scientists Built Tiny, Portable Atomic Clocks—and Naturally, They’re Headed for Drones
Smaller version Illustration of a conventional atomic fountain clock (left) next to NPL’s miniature atomic fountain clock. (Courtesy: NPL) A miniature version of an atomic fountain clock has been ...
22 Atomic vs. Non-Atomic Operations "An operation acting on shared memory is atomic if it completes in a single step relative to other threads. When an atomic store is performed on a shared memory, no other thread can observe the modification half-complete.
Objects of atomic types are the only C++ objects that are free from data races; that is, if one thread writes to an atomic object while another thread reads from it, the behavior is well-defined. In addition, accesses to atomic objects may establish inter-thread synchronization and order non-atomic memory accesses as specified by std::memory_order.
The biggest question is whether an atomic can simply be allocated in shared memory (placement new) and work. Obviously this would only work if it is a true hardware atomic.
11 The difference is that a normal load/store is not guaranteed to be tear-free, whereas a relaxed atomic read/write is. Also, the atomic guarantees that the compiler doesn't rearrange or optimise-out memory accesses in a similar fashion to what volatile guarantees. (Pre-C++11, volatile was an essential part of rolling your own atomics.
c++ - What is the difference between load/store relaxed atomic and ...
Each statement is atomic, but if you want the stored procedure to be atomic (or any sequence of statements in general), you need to explicitly surround the statements with
Yes and no. rename () is atomic assuming the OS does not crash. It cannot be split by any other filesystem op. If the system crashes you might see a ln () operation instead. (But see discussion on journalled filesystems in comments.) Also note, when operating on a network filesystem, you might get ENOENT when the operation succeeded successfully. Local filesystem can't do that to you.
I had a 25-hr debugging marathon in < 2 days and then wrote this answer here. See also the bottom of this question for more info. and documentation on 8-bit variables having naturally atomic writes and naturally atomic reads for AVR 8-bit microcontrollers when compiled with the gcc compiler which uses the AVR-libc library.
Which types on a 64-bit computer are naturally atomic in gnu C and gnu ...
The definition of atomic is hazy; a value that is atomic in one application could be non-atomic in another. For a general guideline, a value is non-atomic if the application deals with only a part of the value. Eg: The current Wikipedia article on First NF (Normal Form) section Atomicity actually quotes from the introductory parts above.
Atomic groups would be used in specific scenarios where greedy quantifiers are used, and further combinations are possible even though there is no alternation. Atomic and non-capturing groups are different. Non-capturing groups don't save the matches' value, while atomic groups disable backtracking if further combinations are needed.
So, this means that Richard Barry is saying that 4-byte reads and writes are atomic on these 32-bit microcontrollers. This means that he, at least, is 100% sure 4-byte reads and writes are atomic on STM32. He doesn't mention smaller-byte reads, but for 4-byte reads he is conclusively sure.