z/OS Language Environment Programming Guide for 64-bit Virtual Addressing Mode
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Natural reentrancy

z/OS Language Environment Programming Guide for 64-bit Virtual Addressing Mode
SA38-0689-00

A C program is naturally reentrant if it contains no modifiable external data. In C, the following are considered modifiable external data:
  • Variables using the extern storage class
  • Variables using the static storage class
  • Writable strings

If your C program is naturally reentrant, you do not need to use the RENT compiler option. After compiling and binding, install it in one of the locations listed in Installing a reentrant load module.

Parent topic: Making your C/C++ program reentrant

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