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    Command:

    spu_create

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <sys/spu.h>
    
           int spu_create(const char *pathname, int flags, mode_t mode);
           int spu_create(const char *pathname, int flags, mode_t mode,
                          int neighbor_fd);
    
           Note: There is no glibc wrapper for this system call; see NOTES.
    
    
    

    DESCRIPTION

           The 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 SPU in
           pathname and returns a file descriptor associated  with  it.   pathname
           must  refer  to  a  nonexistent directory in the mount point of the SPU
           filesystem (spufs).  If spu_create() is successful, a directory is cre-
           ated  at  pathname  and  it  is  populated  with the files described in
           spufs(7).
    
           When a context is created, the returned file  descriptor  can  only  be
           passed  to  spu_run(2), used as the dirfd argument to the *at family of
           system calls (e.g., openat(2)), or closed;  other  operations  are  not
           defined.  A logical SPU context is destroyed (along with all files cre-
           ated within the context's pathname directory) once the  last  reference
           to  the  context has gone; this usually occurs when the file descriptor
           returned by spu_create() is closed.
    
           The flags argument can be zero or any bitwise OR-ed combination of  the
           following constants:
    
           SPU_CREATE_EVENTS_ENABLED
                  Rather  than  using  signals  for  reporting DMA errors, use the
                  event argument to spu_run(2).
    
           SPU_CREATE_GANG
                  Create an SPU gang instead of a context.  (A gang is a group  of
                  SPU  contexts  that  are  functionally related to each other and
                  which share common scheduling  parameters--priority  and  policy.
                  In  the  future,  gang scheduling may be implemented causing the
                  group to be switched in and out as a single unit.)
    
                  A new directory will be created at the location specified by the
                  pathname argument.  This gang may be used to hold other SPU con-
                  texts, by providing a pathname that is within the gang directory
                  to further calls to spu_create().
    
           SPU_CREATE_NOSCHED
                  Create  a  context  that  is  not affected by the SPU scheduler.
                  Once the context is run, it will not be scheduled out  until  it
                  is destroyed by the creating process.
    
                  Creating SPU_CREATE_ISOLATE contexts also requires the  SPU_CRE-
                  ATE_NOSCHED flag.
    
           SPU_CREATE_AFFINITY_SPU
                  Create  a  context  with  affinity to another SPU context.  This
                  affinity information is used within  the  SPU  scheduling  algo-
                  rithm.   Using  this flag requires that a file descriptor refer-
                  ring to the other SPU context be passed in the neighbor_fd argu-
                  ment.
    
           SPU_CREATE_AFFINITY_MEM
                  Create  a context with affinity to system memory.  This affinity
                  information is used within the SPU scheduling algorithm.
    
           The mode argument (minus any bits set in the process's umask(2)) speci-
           fies the permissions used for creating the new directory in spufs.  See
           stat(2) for a full list of the possible mode values.
    
    
    

    RETURN VALUE

           On success, spu_create() returns a new file descriptor.  On  error,  -1
           is returned, and errno is set to one of the error codes listed below.
    
    
    

    ERRORS

           EACCES The  current  user  does  not  have write access to the spufs(7)
                  mount point.
    
           EEXIST An SPU context already exists at the given pathname.
    
           EFAULT pathname is not a valid string pointer in the calling  process's
                  address space.
    
           EINVAL pathname  is  not  a  directory  in the spufs(7) mount point, or
                  invalid flags have been provided.
    
           ELOOP  Too many symbolic links were found while resolving pathname.
    
           EMFILE The process has reached its maximum open files limit.
    
           ENAMETOOLONG
                  pathname is too long.
    
           ENFILE The system has reached the global open files limit.
    
           ENODEV An isolated context was requested, but  the  hardware  does  not
                  support SPU isolation.
    
           ENOENT Part of pathname could not be resolved.
    
           ENOMEM The kernel could not allocate all resources required.
    
           ENOSPC There  are  not  enough  SPU resources available to create a new
                  context or the user-specific limit for the number  of  SPU  con-
    
           convention, it gets mounted in /spu.
    
    
    

    VERSIONS

           The spu_create() system call was added to Linux in kernel 2.6.16.
    
    
    

    CONFORMING TO

           This  call is Linux-specific and implemented only on the PowerPC archi-
           tecture.  Programs using this system call are not portable.
    
    
    

    NOTES

           Glibc does not provide a wrapper for this system call;  call  it  using
           syscall(2).   Note  however, that 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 for the recommended libraries.
    
    
    

    EXAMPLE

           See spu_run(2) for an example of the use of spu_create()
    
    
    

    SEE ALSO

           close(2), spu_run(2), capabilities(7), spufs(7)
    
    
    

    Linux 2012-08-05 SPU_CREATE(2)

    
    
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