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liblgrp(3lib) [minix man page]

liblgrp(3LIB)															     liblgrp(3LIB)

NAME
liblgrp - locality group library SYNOPSIS
cc [ flag... ] file... -llgrp [ library... ] #include <sys/lgrp_user.h> The functions in this library traverse the lgroup (locality group) hierarchy, discover its contents, and set a thread's affinity for an lgroup. A locality group represents the set of CPU-like and memory-like hardware devices that are at most some locality apart from each other. INTERFACES
The shared object liblgrp.so.1 provides the public interfaces defined below. See intro(3) for additional information on shared object interfaces. lgrp_affinity_get lgrp_affinity_set lgrp_children lgrp_cookie_stale lgrp_cpus lgrp_fini lgrp_home lgrp_init lgrp_latency lgrp_latency_cookie lgrp_mem_size lgrp_nlgrps lgrp_parents lgrp_resourcess lgrp_root lgrp_version lgrp_view /usr/lib/liblgrp.so.1 shared object /usr/lib/64/liblgrp.so.1 64-bit shared object See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsl (32-bit) | +-----------------------------+-----------------------------+ | |SUNWcslx (64-bit) | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ intro(3), lgrp_affinity_get(3LGRP), lgrp_children(3LGRP), lgrp_cookie_stale(3LGRP), lgrp_cpus(3LGRP), lgrp_fini(3LGRP), lgrp_home(3LGRP), lgrp_init(3LGRP), lgrp_latency(3LGRP), lgrp_mem_size(3LGRP), lgrp_nlgrps(3LGRP), lgrp_parents(3LGRP), lgrp_root(3LGRP), lgrp_ver- sion(3LGRP), lgrp_view(3LGRP), attributes(5) 26 Jan 2005 liblgrp(3LIB)

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lgrp_init(3LGRP)														  lgrp_init(3LGRP)

NAME
lgrp_init - initialize lgroup interface SYNOPSIS
cc [ flag... ] file... -llgrp [ library... ] #include <sys/lgrp_user.h> lgrp_cookie_t lgrp_init(lgrp_view_t view); The lgrp_init() function initializes the lgroup interface and takes a snapshot of the lgroup hierarchy with the given view. If the given view is LGRP_VIEW_CALLER, the snapshot contains only the resources that are available to the caller (for example, with respect to processor sets). When the view is LGRP_VIEW_OS, the snapshot contains what is available to the operating system. Given the view, lgrp_init() returns a cookie representing this snapshot of the lgroup hierarchy. This cookie should be used with other rou- tines in the lgroup interface needing the lgroup hierarchy. The lgrp_fini(3LGRP) function should be called with the cookie when it is no longer needed. The lgroup hiearchy represents the latency topology of the machine. The hierarchy is simplified to be a tree and can be used to find the nearest resources. The lgroup hiearchy consists of a root lgroup, which is the maximum bounding locality group of the system, contains all the CPU and memory resources of the machine, and may contain other locality groups that contain CPUs and memory within a smaller locality. The leaf lgroups contain resources within the smallest latency. The resources of a given lgroup come directly from the lgroup itself or from leaf lgroups contained within the lgroup. Leaf lgroups directly contain their own resources and do not encapsulate any other lgroups. The lgroup hierarchy can be used to find the nearest resources. From a given lgroup, the closest resources can be found in the lgroup itself. After that, the next nearest resources can be found in its parent lgroup, and so on until the root lgroup is reached where all the resources of the machine are located. Upon successful completion, lgrp_init() returns a cookie. Otherwise it returns LGRP_COOKIE_NONE and sets errno to indicate the error. The lgrp_init() function will fail if: EINVAL The view is not valid. ENOMEM There was not enough memory to allocate the snapshot of the lgroup hierarchy. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ lgrp_children(3LGRP), lgrp_cookie_stale(3LGRP), lgrp_cpus(3LGRP), lgrp_fini(3LGRP), lgrp_mem_size(3LGRP), lgrp_nlgrps(3LGRP), lgrp_par- ents(3LGRP), lgrp_resources(3LGRP), lgrp_root(3LGRP), lgrp_view(3LGRP), liblgrp(3LIB), attributes(5) 26 Jan 2005 lgrp_init(3LGRP)
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