pthread_attr_setstackprealloc()

Set the amount of memory to preallocate for a thread's MAP_LAZY stack

Synopsis:

#include <pthread.h>

int pthread_attr_setstackprealloc(
        const pthread_attr_t * attr, 
        size_t stacksize);

Arguments:

attr: A pointer to the pthread_attr_t structure that defines the attributes to use when creating new threads. For more information, see pthread_attr_init().
stacksize: The amount of stack you want to preallocate for new threads.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_attr_setstackprealloc() function sets the size of the memory to preallocate for a thread's MAP_LAZY stack.

By default, the system allocates sysconf(_SC_PAGESIZE) bytes of physical memory for the initial stack reference. This function allows you to change this default memory size, if you know that a thread will need more stack space. Semantically, there is no difference in operation, but the memory manager attempts to make more efficient use of Memory Management Unit hardware (e.g., a larger page size in the page entry table) for the stack if it knows upfront that more memory will be required.

Note: This function was added in the QNX Neutrino Core OS 6.3.2.

Returns:

EOK: Success.

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes