---
name: "pcre32_assign_jit_stack"
section: "3"
platform: "linux"
package: "pcre"
version: "8.45-5"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/pcre_assign_jit_stack"
---

# pcre32\_assign\_jit\_stack(3)

Perl-compatible regular expressions

Part of [pcre\_assign\_jit\_stack(3)](/pcre_assign_jit_stack/3.md).

## NAME

PCRE - Perl-compatible regular expressions

## SYNOPSIS

**#include \<pcre.h\>**

```
void pcre_assign_jit_stack(pcre_extra *extra,
     pcre_jit_callback callback, void *data);

void pcre16_assign_jit_stack(pcre16_extra *extra,
     pcre16_jit_callback callback, void *data);

void pcre32_assign_jit_stack(pcre32_extra *extra,
     pcre32_jit_callback callback, void *data);
```

## DESCRIPTION

This function provides control over the memory used as a stack at run-time by a call to **pcre\[16\|32\]\_exec()** with a pattern that has been successfully compiled with JIT optimization. The arguments are:

  extra     the data pointer returned by **pcre\[16\|32\]\_study()**\
   callback  a callback function\
   data      a JIT stack or a value to be passed to the callback\
               function

If *callback* is NULL and *data* is NULL, an internal 32K block on the machine stack is used.

If *callback* is NULL and *data* is not NULL, *data* must be a valid JIT stack, the result of calling **pcre\[16\|32\]\_jit\_stack\_alloc()**.

If *callback* not NULL, it is called with *data* as an argument at the start of matching, in order to set up a JIT stack. If the result is NULL, the internal 32K stack is used; otherwise the return value must be a valid JIT stack, the result of calling **pcre\[16\|32\]\_jit\_stack\_alloc()**.

You may safely assign the same JIT stack to multiple patterns, as long as they are all matched in the same thread. In a multithread application, each thread must use its own JIT stack. For more details, see the **pcrejit** page.

There is a complete description of the PCRE native API in the **pcreapi** page and a description of the POSIX API in the **pcreposix** page.