These functions are obsolete and maintained for compatibility only. The thr_setconcurrency() function updates the desired concurrency level that libthread maintains for the calling process. This value does not affect the behavior of the calling process.

The thr_getconcurrency() function returns the current value for the desired concurrency level.

The thr_getconcurrency() function always returns the current value for the desired concurrency level.

If successful, the thr_setconcurrency() function returns 0. Otherwise, a non-zero value is returned to indicate the error.

The thr_setconcurrency() function will fail if:

EAGAIN

The specified concurrency level would cause a system resource to be exceeded.

EINVAL

The value for new_level is negative.

See attributes(5) for descriptions of the following attributes:

thr_create(3THR), attributes(5), standards(5)