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spu_create() - Unix, Linux System Call
spu_create - create a new spu context
int spu_create(const char *pathname, int flags, mode_t mode);
spu_create system call is used on PowerPC machines that implement the
Cell Broadband Engine Architecture in order to access Synergistic
Processor Units (SPUs). It creates a new logical context for an
pathname and returns a handle to associated with it.
pathname must point to a non-existing directory in the mount point of the
SPU file system
spu_create is successful, a directory gets created on
pathname and it is populated with files.
The returned file handle can only be passed to
or closed, other operations are not defined on it. When it is closed,
all associated directory entries in
spufs are removed. When the last file handle pointing either inside of the
context directory or to this file descriptor is closed, the logical
SPU context is destroyed.
flags can be zero or any bitwise ord combination of the following constants:
mode parameter specifies the permissions used for creating the new
directory in spufs.
mode is modified with the users
value and then used for both the directory and the files
contained in it. The file permissions mask out some more bits
mode because they typically support only read or write access. See
stat(2) for a full list of the possible
Allow mapping of some of the hardware registers of the SPU into user
space. This flag requires the
CAP_SYS_RAWIO capability, see
spu_create returns a new file descriptor. It may return -1 to
indicate an error condition and set errno to one of the error
codes listed below.
The current user does not have write access on the
spufs mount point.
An SPU context already exists at the given path name.
pathname is not a valid string pointer in the current address space.
pathname is not a directory in the
spufs mount point.
Too many symlinks were found while resolving
The process has reached its maximum open file limit.
pathname was too long.
The system has reached the global open file limit.
pathname could not be resolved.
The kernel could not allocate all resources required.
There are not enough SPU resources available to create
a new context or the user specific limit for the number
of SPU contexts has been reached.
the functionality is not provided by the current system, because
either the hardware does not provide SPUs or the
spufs module is not loaded.
A part of
pathname is not a directory.
spu_create is meant to be used from libraries that implement a more abstract
interface to SPUs, not to be used from regular applications.
See http://www.bsc.es/projects/deepcomputing/linuxoncell/ for
the recommended libraries.
pathname must point to a location beneath the mount point of
spufs. By convention, it gets mounted in
This call is Linux specific and only implemented by the ppc64
architecture. Programs using this system call are not portable.
The code does not yet fully implement all features lined out here.
Arnd Bergmann <email@example.com>