Because application programs could be shared by many concurrent threads, the use of static variables embedded within a program ( or use of operating system memory ) was restricted ( by convention only ).
22.
And since the initialization phase writes the static variable INSTANCE in a serial operation, all subsequent concurrent invocations of the getInstance will return the same correctly initialized INSTANCE without incurring any additional synchronization overhead.
23.
This structures the generated machine code, for example dividing it into sections such as the . text ( executable code ), . data ( static variables ), and . rodata ( static constants ).
24.
In particular, under manually reference-counted memory management, these objects are autoreleased, which requires added care when e . g ., used with function-static variables or other kinds of globals.
25.
Objects stored in a static variable ( notably a global variable ) may not be finalized when the program terminates, so their resources are not released; CPython makes no guarantee of finalizing such objects, for instance.
26.
:: This is essentially doing the same as Steve's " second way " example, except that the buffer there was in the global namespace, while here it is hidden as a static variable within the function.
27.
In some cases object lifetime coincides with variable lifetime of a variable with that object as value ( both for static variables and automatic variables ), but in general object lifetime is not tied to the lifetime of any one variable.
28.
A global or static variable can be declared ( or a symbol defined in assembly ) with a keyword qualifier such as, constant, or meaning that its value will be set at compile time and should not be changeable at runtime.
29.
Then, Copker finished the following mechanisms to prevent the sensitive private keys from being synchronized into RAM . ( 1 ) Eliminate heap variables, and only static variables are used in the computations; switching stack to pre-allocated data variables.
30.
Global data is defined outside functions, and can be accessed by more than one function, either in form of global variables ( data shared between all functions ), or as static variables ( data shared by all functions of the same name ).
