Characteristics of C++ function memory allocation and destruction on different operating systems

Characteristics of C functions memory allocation and destruction on different systems Memory allocation: Windows: Use the heap allocator of the msvcrt.dll library Linux: Use the heap allocator of glibc macOS: Use the allocator of the system library Memory destruction: Windows: Use the heap allocator to release newly allocated memory Linux: Use glibc's heap allocator to release newly allocated memory macOS: Use the system library's allocator to release newly allocated memory

Characteristics of C function memory allocation and destruction on different operating systems

Memory allocation

In C, new Operator is used to allocate memory. new may behave differently on different operating systems.

• Windows: In Windows systems, the new operator uses the heap allocator to allocate memory, which is used by msvcrt.dll library provided.
• Linux: In Linux systems, the new operator uses the heap allocator in glibc.
• macOS: In macOS system, the new operator uses the allocator provided by the system library, such as libmalloc.

Memory Destruction

The delete operator is used to destroy the allocated memory when it is no longer needed. Similar to the new operator, the behavior of delete may vary on different operating systems.

• Windows: In Windows systems, the delete operator uses the heap allocator to free memory. It can free memory allocated by new or malloc.
• Linux: In Linux systems, the delete operator uses the heap allocator in glibc to free memory. It can also free memory allocated by new or malloc.
• macOS: In macOS system, the delete operator uses the allocator provided by the system library to release memory. It can free memory allocated by new or malloc.

Practical Case

Let us consider a simple program that allocates and destroys a character array.

#include <iostream>

int main() {
  // 在 Linux 中使用 glibc 分配字符数组
  char* str = new char[10];
  // ... 使用字符数组 ...

  // 在 Windows 中使用堆分配器销毁字符数组
  delete[] str;

  return 0;
}

Conclusion

Understanding the characteristics of C function memory allocation and destruction on different operating systems is crucial to optimizing code performance and avoiding errors.

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