即惰性初始化（lazy initialization）。自 C++11 起，局部static变量的初始化是线程安全的，保证多个线程...
静态变量需要在.cpp初始化,否则报错连接错误, 对于原始数据, int, double, … simple.h classSimple { public: Simple(void); ~Simple(void); staticintGetInt(void); private: staticint_i; }; simple.cpp intSimple::GetInt(void) { return_i; } 连接出错: error LNK2001: unresolved external symbol "...
静态变量需要在.cpp初始化,否则报错连接错误, 对于原始数据, int, double, … simple.h classSimple { public: Simple(void); ~Simple(void); staticintGetInt(void); private: staticint_i; }; simple.cpp intSimple::GetInt(void) { return_i; } 连接出错: error LNK2001: unresolved external symbol "...
Only one thread may leave // this function before the variable has completed initialization, this thread // will perform initialization. All other threads are blocked until the // initialization completes or fails due to an exception. int const Uninitialized = 0; int const BeingInitialized = -1...
```c // The IA64/generic ABI uses the first byte of the guard variable. // The ARM EABI uses the least significant bit. // Thread-safe static local initialization support. #ifdef __GTHREADS namespace { // static_mutex is a single mutex controlling all static initializations. // This...
9Solving the "Static Initialization Order Fiasco" SIOF是存储时期为 static 的这类数据在跨 TUs 时相互依赖所导致的问题,因为不同 TUs 中的这些数据初始化顺序没有规定,引用的数据可能还没初始化。 因此全局变量、静态变量、静态成员变量都可能会引起这个问题。
return 1; // This thread should do the initialization. } if (expected == guard_bit) { // Already initialized. return 0; } if (expected == pending_bit) { // Use acquire here. int newv = expected | waiting_bit; // 0x10100 ...
# or remove the initializationinthe declarationofvariable. 上述代码仿真结果为: 代码语言:javascript 复制 # @1def_cnt=1# @2def_cnt=2 ex6: 代码语言:javascript 复制 functionintdef_cnt_auto(input a);automatic int cnt=0;cnt+=a;returncnt;endfunction$display("@1 def_cnt_auto = %0d",def_cnt...
There are several actions that are part of static initialization. Those actions take place in the following order: Static fields are set to 0. This is typically done by the runtime. Static field initializers run. The static field initializers in the most derived type run. Base type static fi...
I currently work at a project that uses a MC9S08SH16 micro and I have a question about variable initialization at start-up. I used the following code #define DEFINED_VAR void nameFunction1(void) { static unsigned char var1 = DEFINED_VAR; if(var1 != 0) { --var1;...