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Test Your Knowledge in Computers #586
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Making many function calls can be costly in terms of stack space. One optimization that can be made is to use tail recursion.
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pset_list(2) [opensolaris man page]

pset_list(2)							   System Calls 						      pset_list(2)

NAME
pset_list - get list of processor sets SYNOPSIS
#include <sys/pset.h> int pset_list(psetid_t *psetlist, uint_t *numpsets); DESCRIPTION
The pset_list() function returns a list of processor sets in the system. If numpsets is non-null, then on successful completion the number of processor sets in the system will be stored in the location pointed to by numpsets. If numpsets and psetlist are both non-null, then psetlist points to a buffer where a list of processor sets in the system is to be stored, and numpsets points to the maximum number of processor set IDs the buffer can hold. On successful completion, the list of processor sets up to the maximum buffer size is stored in the buffer pointed to by psetlist. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The pset_list() function will fail if: EFAULT The location pointed to by psetlist or numpsets was not null and not writable by the user. USAGE
If the caller is in a non-global zone and the pools facility is active, pset_list() returns only the processor set of the pool to which the zone is bound. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
pooladm(1M), psrset(1M), zoneadm(1M), processor_info(2), pset_bind(2), pset_create(2), pset_info(2), pset_getloadavg(3C), attributes(5) SunOS 5.11 28 Jun 2004 pset_list(2)

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pset_info(2)							   System Calls 						      pset_info(2)

NAME
pset_info - get information about a processor set SYNOPSIS
#include <sys/pset.h> int pset_info(psetid_t pset, int *type, uint_t *numcpus, processorid_t *cpulist); DESCRIPTION
The pset_info() function returns information on the processor set pset. If type is non-null, then on successful completion the type of the processor set will be stored in the location pointed to by type. The only type supported for active processor sets is PS_PRIVATE. If numcpus is non-null, then on successful completion the number of processors in the processor set will be stored in the location pointed to by numcpus. If numcpus and cpulist are both non-null, then cpulist points to a buffer where a list of processors assigned to the processor set is to be stored, and numcpus points to the maximum number of processor IDs the buffer can hold. On successful completion, the list of processors up to the maximum buffer size is stored in the buffer pointed to by cpulist. If pset is PS_NONE, the list of processors not assigned to any processor set will be stored in the buffer pointed to by cpulist, and the number of such processors will be stored in the location pointed to by numcpus. The location pointed to by type will be set to PS_NONE. If pset is PS_MYID, the processor list and number of processors returned will be those of the processor set to which the caller is bound. If the caller is not bound to a processor set, the result will be equivalent to setting pset to PS_NONE. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The pset_info() function will fail if: EFAULT The location pointed to by type, numcpus, or cpulist was not null and not writable by the user. EINVAL An invalid processor set ID was specified. The caller is in a non-global zone, the pools facility is active, and the processor is not a member of the zone's pool's processor set. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
pooladm(1M), psrinfo(1M), psrset(1M), zoneadm(1M), processor_info(2), pset_assign(2), pset_bind(2), pset_create(2), pset_destroy(2), pset_getloadavg(3C), attributes(5) NOTES
The processor set of type PS_SYSTEM is no longer supported. SunOS 5.10 28 Jun 2004 pset_info(2)

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