Control the thread pool behavior
Synopsis:
#include <sys/iofunc.h>
#include <sys/dispatch.h>
thread_pool_control( thread_pool_t * pool,
thread_pool_attr_t * attr,
uint16_t lower,
uint16_t upper,
unsigned flags )
Arguments:
- pool
- A thread pool handle that was returned by
thread_pool_create().
- attr
- A pointer to a thread_pool_attr_t structure that
specifies the attributes that you want to use for the thread pool.
For more information, see
“Thread-pool attributes,”
in the documentation for thread_pool_create().
- lower, upper
- This function blocks until the number of threads created is
between the range of upper and lower,
unless you set THREAD_POOL_CONTROL_NONBLOCK in
flags.
- flags
- Which attributes you want to change for the thread pool; any combination
of the following bits:
- THREAD_POOL_CONTROL_HIWATER — adjust the
high-water value of the number of threads allowed in the thread pool.
- THREAD_POOL_CONTROL_INCREMENT — adjust the
increment value of the number of threads.
- THREAD_POOL_CONTROL_LOWATER — adjust the low-water
value of the number of threads allowed in the thread pool.
- THREAD_POOL_CONTROL_MAXIMUM — adjust the maximum
value of the number of threads allowed in the thread pool.
- THREAD_POOL_CONTROL_NONBLOCK
— don't block while creating threads.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
Use thread_pool_control() to specify a thread pool's behavior
and adjust its attributes.
Returns:
-1 if an error occurs (errno is set).
Classification:
QNX Neutrino
| Safety: |
|
|---|
| Cancellation point |
Yes |
| Interrupt handler |
No |
| Signal handler |
No |
| Thread |
Yes |