


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 bymsvcrt.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 aslibmalloc
.
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 bynew
ormalloc
. -
Linux: In Linux systems, the
delete
operator uses the heap allocator in glibc to free memory. It can also free memory allocated bynew
ormalloc
. -
macOS: In macOS system, the
delete
operator uses the allocator provided by the system library to release memory. It can free memory allocated bynew
ormalloc
.
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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