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Threads and stack size
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pthread_default_stacksize_np(3T) pthread_default_stacksize_np(3T) NAME
pthread_default_stacksize_np() - change the default stacksize SYNOPSIS
PARAMETERS
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 terminate. The next time a thread is created with a default stack size, a cached thread (and its stack) are reused. This can result in significant performance improvements for However, if the default stack size is not appropriate for an application, 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 application 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 created). WARNINGS
If the environment variable is set with a valid value for default stack size, then it takes precedence over the invocation of interface. However, it returns the current default stack size in old_size. The maximum default stack size value that may be set through the environment 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 ALSO
pthread_attr_getstacksize(3T), pthread_attr_setstacksize(3T). STANDARDS CONFORMANCE
Pthread Library pthread_default_stacksize_np(3T)
