pthread_default_stacksize_np(3T)pthread_default_stacksize_np(3T)NAMEpthread_default_stacksize_np() - change the default stacksize
SYNOPSISPARAMETERS
new_size The new default stack size.
old_size Pointer to where the old default stack size is
returned.
DESCRIPTION
The function allows an application to change the default value for the
stacksize attribute. This function must be called before any threads
have been created. The new default stack size is passed in the
new_size parameter. If not NULL, the previous default stack size is
returned in old_size. If new_size is zero, this function can be used
(at any time) to query the current default stack size.
On HP-UX, threads with default stack sizes are cached after they termi‐
nate. The next time a thread is created with a default stack size, a
cached thread (and its stack) are reused. This can result in signifi‐
cant performance improvements for
However, if the default stack size is not appropriate for an applica‐
tion, it cannot take advantage of this performance enhancement. By
using the function, the threads library will change the default stack
size so that it matches the applications needs. This allows the appli‐
cation to utilize the performance benefit of cached threads.
RETURN VALUE
Upon successful completion, returns zero. Otherwise, an error number is
returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the function returns the corresponding
error number:
[EINVAL] The value specified by new_size is less than
[EPERM] The calling process has already created threads
(this must be called before any threads are cre‐
ated).
WARNINGS
If the environment variable is set with a valid value for default stack
size, then it takes precedence over the invocation of interface. How‐
ever, it returns the current default stack size in old_size.
The maximum default stack size value that may be set through the envi‐
ronment variable is restricted to 10 MB; any value greater than 10 MB
will be rounded down to 10 MB.
Care should be taken while setting the default stack size limit since
this could impact the maximum number of threads that can be created in
a process.
AUTHOR
was developed by HP.
SEE ALSOpthread_attr_getstacksize(3T), pthread_attr_setstacksize(3T).
STANDARDS CONFORMANCE
Pthread Librarpthread_default_stacksize_np(3T)