IO-AIO/AIO.xs

#if __linux
# define _GNU_SOURCE
#endif

#define _REENTRANT 1

#include <errno.h>

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "autoconf/config.h"

#include <pthread.h>

#include <stddef.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>

#if HAVE_SENDFILE
# if __linux
#  include <sys/sendfile.h>
# elif __freebsd
#  include <sys/socket.h>
#  include <sys/uio.h>
# elif __hpux
#  include <sys/socket.h>
# elif __solaris /* not yet */
#  include <sys/sendfile.h>
# else
#  error sendfile support requested but not available
# endif
#endif

/* used for struct dirent, AIX doesn't provide it */
#ifndef NAME_MAX
# define NAME_MAX 4096
#endif

#if __ia64
# define STACKSIZE 65536
#else
# define STACKSIZE  8192
#endif

enum {
  REQ_QUIT,
  REQ_OPEN, REQ_CLOSE,
  REQ_READ, REQ_WRITE, REQ_READAHEAD,
  REQ_SENDFILE,
  REQ_STAT, REQ_LSTAT, REQ_FSTAT,
  REQ_FSYNC, REQ_FDATASYNC,
  REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
  REQ_READDIR,
  REQ_LINK, REQ_SYMLINK,
  REQ_GROUP, REQ_NOP,
  REQ_SLEEP,
};

#define AIO_REQ_KLASS "IO::AIO::REQ"
#define AIO_GRP_KLASS "IO::AIO::GRP"

typedef struct aio_cb
{
  struct aio_cb *volatile next;

  SV *data, *callback;
  SV *fh, *fh2;
  void *dataptr, *data2ptr;
  Stat_t *statdata;
  off_t offset;
  size_t length;
  ssize_t result;

  STRLEN dataoffset;
  int type;
  int fd, fd2;
  int errorno;
  mode_t mode; /* open */

  unsigned char flags;
  unsigned char pri;

  SV *self; /* the perl counterpart of this request, if any */
  struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
} aio_cb;

enum {
  FLAG_CANCELLED = 0x01,
};

typedef aio_cb *aio_req;
typedef aio_cb *aio_req_ornot;

enum {
  PRI_MIN     = -4,
  PRI_MAX     =  4,

  DEFAULT_PRI = 0,
  PRI_BIAS    = -PRI_MIN,
};

static int next_pri = DEFAULT_PRI + PRI_BIAS;

static int started, wanted;
static volatile int nreqs;
static int max_outstanding = 1<<30;
static int respipe [2];

#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
#else
# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
#endif

static pthread_mutex_t reslock = AIO_MUTEX_INIT;
static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
static pthread_cond_t  reqwait = PTHREAD_COND_INITIALIZER;

static volatile aio_req reqs, reqe; /* queue start, queue end */
static volatile aio_req ress, rese; /* queue start, queue end */

static void req_invoke (aio_req req);
static void req_free (aio_req req);

/* must be called at most once */
static SV *req_sv (aio_req req, const char *klass)
{
  if (!req->self)
    {
      req->self = (SV *)newHV ();
      sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
    }

  return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
}

static aio_req SvAIO_REQ (SV *sv)
{
  MAGIC *mg;

  if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
    croak ("object of class " AIO_REQ_KLASS " expected");

  mg = mg_find (SvRV (sv), PERL_MAGIC_ext);

  return mg ? (aio_req)mg->mg_ptr : 0;
}

static void aio_grp_feed (aio_req grp)
{
  while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
    {
      int old_len = grp->length;

      if (grp->fh2 && SvOK (grp->fh2))
        {
          dSP;

          ENTER;
          SAVETMPS;
          PUSHMARK (SP);
          XPUSHs (req_sv (grp, AIO_GRP_KLASS));
          PUTBACK;
          call_sv (grp->fh2, G_VOID | G_EVAL);
          SPAGAIN;
          FREETMPS;
          LEAVE;
        }

      /* stop if no progress has been made */
      if (old_len == grp->length)
        {
          SvREFCNT_dec (grp->fh2);
          grp->fh2 = 0;
          break;
        }
    }
}

static void aio_grp_dec (aio_req grp)
{
  --grp->length;

  /* call feeder, if applicable */
  aio_grp_feed (grp);

  /* finish, if done */
  if (!grp->length && grp->fd)
    {
      req_invoke (grp);
      req_free (grp);
    }
}

static void poll_wait ()
{
  fd_set rfd;

  while (nreqs)
    {
      aio_req req;
      pthread_mutex_lock (&reslock);
      req = ress;
      pthread_mutex_unlock (&reslock);

      if (req)
        return;

      FD_ZERO(&rfd);
      FD_SET(respipe [0], &rfd);

      select (respipe [0] + 1, &rfd, 0, 0, 0);
    }
}

static void req_invoke (aio_req req)
{
  dSP;
  int errorno = errno;

  if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
    return;

  errno = req->errorno;

  ENTER;
  SAVETMPS;
  PUSHMARK (SP);
  EXTEND (SP, 1);

  switch (req->type)
    {
      case REQ_READDIR:
        {
          SV *rv = &PL_sv_undef;

          if (req->result >= 0)
            {
              char *buf = req->data2ptr;
              AV *av = newAV ();

              while (req->result)
                {
                  SV *sv = newSVpv (buf, 0);

                  av_push (av, sv);
                  buf += SvCUR (sv) + 1;
                  req->result--;
                }

              rv = sv_2mortal (newRV_noinc ((SV *)av));
            }

          PUSHs (rv);
        }
        break;

      case REQ_OPEN:
        {
          /* convert fd to fh */
          SV *fh;

          PUSHs (sv_2mortal (newSViv (req->result)));
          PUTBACK;
          call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
          SPAGAIN;

          fh = SvREFCNT_inc (POPs);

          PUSHMARK (SP);
          XPUSHs (sv_2mortal (fh));
        }
        break;

      case REQ_GROUP:
        req->fd = 2; /* mark group as finished */

        if (req->data)
          {
            int i;
            AV *av = (AV *)req->data;

            EXTEND (SP, AvFILL (av) + 1);
            for (i = 0; i <= AvFILL (av); ++i)
              PUSHs (*av_fetch (av, i, 0));
          }
        break;

      case REQ_NOP:
      case REQ_SLEEP:
        break;

      default:
        PUSHs (sv_2mortal (newSViv (req->result)));
        break;
    }


  PUTBACK;
  call_sv (req->callback, G_VOID | G_EVAL);
  SPAGAIN;

  FREETMPS;
  LEAVE;

  errno = errorno;

  if (SvTRUE (ERRSV))
    {
      req_free (req);
      croak (0);
    }
}

static void req_free (aio_req req)
{
  if (req->grp)
    {
      aio_req grp = req->grp;

      /* unlink request */
      if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
      if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;

      if (grp->grp_first == req)
        grp->grp_first = req->grp_next;

      aio_grp_dec (grp);
    }

  if (req->self)
    {
      sv_unmagic (req->self, PERL_MAGIC_ext);
      SvREFCNT_dec (req->self);
    }

  SvREFCNT_dec (req->data);
  SvREFCNT_dec (req->fh);
  SvREFCNT_dec (req->fh2);
  SvREFCNT_dec (req->callback);
  Safefree (req->statdata);

  if (req->type == REQ_READDIR && req->result >= 0)
    free (req->data2ptr);

  Safefree (req);
}

static void req_cancel (aio_req req)
{
  req->flags |= FLAG_CANCELLED;

  if (req->type == REQ_GROUP)
    {
      aio_req sub;

      for (sub = req->grp_first; sub; sub = sub->grp_next)
        req_cancel (sub);
    }
}

static int poll_cb ()
{
  dSP;
  int count = 0;
  int do_croak = 0;
  aio_req req;

  for (;;)
    {
      pthread_mutex_lock (&reslock);
      req = ress;

      if (req)
        {
          ress = req->next;

          if (!ress)
            {
              /* read any signals sent by the worker threads */
              char buf [32];
              while (read (respipe [0], buf, 32) == 32)
                ;

              rese = 0;
            }
        }

      pthread_mutex_unlock (&reslock);

      if (!req)
        break;

      --nreqs;

      if (req->type == REQ_QUIT)
        started--;
      else if (req->type == REQ_GROUP && req->length)
        {
          req->fd = 1; /* mark request as delayed */
          continue;
        }
      else
        {
          if (req->type == REQ_READ)
            SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));

          if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
            SvREADONLY_off (req->data);

          if (req->statdata)
            {
              PL_laststype   = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
              PL_laststatval = req->result;
              PL_statcache   = *(req->statdata);
            }

          req_invoke (req);

          count++;
        }

      req_free (req);
    }

  return count;
}

static void *aio_proc(void *arg);

static void start_thread (void)
{
  sigset_t fullsigset, oldsigset;
  pthread_t tid;
  pthread_attr_t attr;

  pthread_attr_init (&attr);
  pthread_attr_setstacksize (&attr, STACKSIZE);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);

  sigfillset (&fullsigset);
  sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);

  if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
    started++;

  sigprocmask (SIG_SETMASK, &oldsigset, 0);
}

static void req_send (aio_req req)
{
  while (started < wanted && nreqs >= started)
    start_thread ();

  ++nreqs;

  pthread_mutex_lock (&reqlock);

  req->next = 0;

  if (reqe)
    {
      reqe->next = req;
      reqe = req;
    }
  else
    reqe = reqs = req;

  pthread_cond_signal (&reqwait);
  pthread_mutex_unlock (&reqlock);

  if (nreqs > max_outstanding)
    for (;;)
      {
        poll_cb ();

        if (nreqs <= max_outstanding)
          break;

        poll_wait ();
      }
}

static void end_thread (void)
{
  aio_req req;
  Newz (0, req, 1, aio_cb);
  req->type = REQ_QUIT;

  req_send (req);
}

static void min_parallel (int nthreads)
{
  if (wanted < nthreads)
    wanted = nthreads;
}

static void max_parallel (int nthreads)
{
  int cur = started;

  if (wanted > nthreads)
    wanted = nthreads;

  while (cur > wanted)
    {
      end_thread ();
      cur--;
    }

  while (started > wanted)
    {
      poll_wait ();
      poll_cb ();
    }
}

static void create_pipe ()
{
  if (pipe (respipe))
    croak ("unable to initialize result pipe");

  if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
    croak ("cannot set result pipe to nonblocking mode");

  if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
    croak ("cannot set result pipe to nonblocking mode");
}

/*****************************************************************************/
/* work around various missing functions */

#if !HAVE_PREADWRITE
# define pread  aio_pread
# define pwrite aio_pwrite

/*
 * make our pread/pwrite safe against themselves, but not against
 * normal read/write by using a mutex. slows down execution a lot,
 * but that's your problem, not mine.
 */
static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;

static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
{
  ssize_t res;
  off_t ooffset;

  pthread_mutex_lock (&preadwritelock);
  ooffset = lseek (fd, 0, SEEK_CUR);
  lseek (fd, offset, SEEK_SET);
  res = read (fd, buf, count);
  lseek (fd, ooffset, SEEK_SET);
  pthread_mutex_unlock (&preadwritelock);

  return res;
}

static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
{
  ssize_t res;
  off_t ooffset;

  pthread_mutex_lock (&preadwritelock);
  ooffset = lseek (fd, 0, SEEK_CUR);
  lseek (fd, offset, SEEK_SET);
  res = write (fd, buf, count);
  lseek (fd, offset, SEEK_SET);
  pthread_mutex_unlock (&preadwritelock);

  return res;
}
#endif

#if !HAVE_FDATASYNC
# define fdatasync fsync
#endif

#if !HAVE_READAHEAD
# define readahead aio_readahead

static ssize_t readahead (int fd, off_t offset, size_t count)
{
  char readahead_buf[4096];

  while (count > 0)
    {
      size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);

      pread (fd, readahead_buf, len, offset);
      offset += len;
      count  -= len;
    }

  errno = 0;
}
#endif

#if !HAVE_READDIR_R
# define readdir_r aio_readdir_r

static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
  
static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
{
  struct dirent *e;
  int errorno;

  pthread_mutex_lock (&readdirlock);

  e = readdir (dirp);
  errorno = errno;

  if (e)
    {
      *res = ent;
      strcpy (ent->d_name, e->d_name);
    }
  else
    *res = 0;

  pthread_mutex_unlock (&readdirlock);

  errno = errorno;
  return e ? 0 : -1;
}
#endif

/* sendfile always needs emulation */
static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
{
  ssize_t res;

  if (!count)
    return 0;

#if HAVE_SENDFILE
# if __linux
  res = sendfile (ofd, ifd, &offset, count);

# elif __freebsd
  /*
   * Of course, the freebsd sendfile is a dire hack with no thoughts
   * wasted on making it similar to other I/O functions.
   */
  {
    off_t sbytes;
    res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);

    if (res < 0 && sbytes)
      /* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
      res = sbytes;
  }

# elif __hpux
  res = sendfile (ofd, ifd, offset, count, 0, 0);

# elif __solaris
  {
    struct sendfilevec vec;
    size_t sbytes;

    vec.sfv_fd   = ifd;
    vec.sfv_flag = 0;
    vec.sfv_off  = offset;
    vec.sfv_len  = count;

    res = sendfilev (ofd, &vec, 1, &sbytes);

    if (res < 0 && sbytes)
      res = sbytes;
  }

# endif
#else
  res = -1;
  errno = ENOSYS;
#endif

  if (res <  0
      && (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
#if __solaris
          || errno == EAFNOSUPPORT || errno == EPROTOTYPE
#endif
         )
      )
    {
      /* emulate sendfile. this is a major pain in the ass */
      char buf[4096];
      res = 0;

      while (count)
        {
          ssize_t cnt;
          
          cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);

          if (cnt <= 0)
            {
              if (cnt && !res) res = -1;
              break;
            }

          cnt = write (ofd, buf, cnt);

          if (cnt <= 0)
            {
              if (cnt && !res) res = -1;
              break;
            }

          offset += cnt;
          res    += cnt;
          count  -= cnt;
        }
    }

  return res;
}

/* read a full directory */
static int scandir_ (const char *path, void **namesp)
{
  DIR *dirp = opendir (path);
  union
  {    
    struct dirent d;
    char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
  } u;
  struct dirent *entp;
  char *name, *names;
  int memlen = 4096;
  int memofs = 0;
  int res = 0;
  int errorno;

  if (!dirp)
    return -1;

  names = malloc (memlen);

  for (;;)
    {
      errno = 0, readdir_r (dirp, &u.d, &entp);

      if (!entp)
        break;

      name = entp->d_name;

      if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
        {
          int len = strlen (name) + 1;

          res++;

          while (memofs + len > memlen)
            {
              memlen *= 2;
              names = realloc (names, memlen);
              if (!names)
                break;
            }

          memcpy (names + memofs, name, len);
          memofs += len;
        }
    }

  errorno = errno;
  closedir (dirp);

  if (errorno)
    {
      free (names);
      errno = errorno;
      res = -1;
    }

  *namesp = (void *)names;
  return res;
}

/*****************************************************************************/

static void *aio_proc (void *thr_arg)
{
  aio_req req;
  int type;

  do
    {
      pthread_mutex_lock (&reqlock);

      for (;;)
        {
          req = reqs;

          if (reqs)
            {
              reqs = reqs->next;
              if (!reqs) reqe = 0;
            }

          if (req)
            break;

          pthread_cond_wait (&reqwait, &reqlock);
        }

      pthread_mutex_unlock (&reqlock);
     
      errno = 0; /* strictly unnecessary */
      type = req->type; /* remember type for QUIT check */

      if (!(req->flags & FLAG_CANCELLED))
        switch (type)
          {
            case REQ_READ:      req->result = pread     (req->fd, req->dataptr, req->length, req->offset); break;
            case REQ_WRITE:     req->result = pwrite    (req->fd, req->dataptr, req->length, req->offset); break;

            case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
            case REQ_SENDFILE:  req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;

            case REQ_STAT:      req->result = stat      (req->dataptr, req->statdata); break;
            case REQ_LSTAT:     req->result = lstat     (req->dataptr, req->statdata); break;
            case REQ_FSTAT:     req->result = fstat     (req->fd     , req->statdata); break;

            case REQ_OPEN:      req->result = open      (req->dataptr, req->fd, req->mode); break;
            case REQ_CLOSE:     req->result = close     (req->fd); break;
            case REQ_UNLINK:    req->result = unlink    (req->dataptr); break;
            case REQ_RMDIR:     req->result = rmdir     (req->dataptr); break;
            case REQ_RENAME:    req->result = rename    (req->data2ptr, req->dataptr); break;
            case REQ_LINK:      req->result = link      (req->data2ptr, req->dataptr); break;
            case REQ_SYMLINK:   req->result = symlink   (req->data2ptr, req->dataptr); break;

            case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
            case REQ_FSYNC:     req->result = fsync     (req->fd); break;
            case REQ_READDIR:   req->result = scandir_  (req->dataptr, &req->data2ptr); break;

            case REQ_SLEEP:
              {
                struct timeval tv;

                tv.tv_sec  = req->fd;
                tv.tv_usec = req->fd2;

                req->result = select (0, 0, 0, 0, &tv);
              }

            case REQ_GROUP:
            case REQ_NOP:
            case REQ_QUIT:
              break;

            default:
              req->result = ENOSYS;
              break;
          }

      req->errorno = errno;

      pthread_mutex_lock (&reslock);

      req->next = 0;

      if (rese)
        {
          rese->next = req;
          rese = req;
        }
      else
        {
          rese = ress = req;

          /* write a dummy byte to the pipe so fh becomes ready */
          write (respipe [1], &respipe, 1);
        }

      pthread_mutex_unlock (&reslock);
    }
  while (type != REQ_QUIT);

  return 0;
}

/*****************************************************************************/

static void atfork_prepare (void)
{
  pthread_mutex_lock (&reqlock);
  pthread_mutex_lock (&reslock);
#if !HAVE_PREADWRITE
  pthread_mutex_lock (&preadwritelock);
#endif
#if !HAVE_READDIR_R
  pthread_mutex_lock (&readdirlock);
#endif
}

static void atfork_parent (void)
{
#if !HAVE_READDIR_R
  pthread_mutex_unlock (&readdirlock);
#endif
#if !HAVE_PREADWRITE
  pthread_mutex_unlock (&preadwritelock);
#endif
  pthread_mutex_unlock (&reslock);
  pthread_mutex_unlock (&reqlock);
}

static void atfork_child (void)
{
  aio_req prv;

  started = 0;

  while (reqs)
    {
      prv = reqs;
      reqs = prv->next;
      req_free (prv);
    }

  reqs = reqe = 0;
      
  while (ress)
    {
      prv = ress;
      ress = prv->next;
      req_free (prv);
    }
      
  ress = rese = 0;

  close (respipe [0]);
  close (respipe [1]);
  create_pipe ();

  atfork_parent ();
}

#define dREQ                                                    \
  aio_req req;                                                  \
  int req_pri = next_pri;                                       \
  next_pri = DEFAULT_PRI + PRI_BIAS;                            \
                                                                \
  if (SvOK (callback) && !SvROK (callback))                     \
    croak ("callback must be undef or of reference type");      \
                                                                \
  Newz (0, req, 1, aio_cb);                                     \
  if (!req)                                                     \
    croak ("out of memory during aio_req allocation");          \
                                                                \
  req->callback = newSVsv (callback);                           \
  req->pri = req_pri

#define REQ_SEND                                                \
  req_send (req);                                               \
                                                                \
  if (GIMME_V != G_VOID)                                        \
    XPUSHs (req_sv (req, AIO_REQ_KLASS));
        
MODULE = IO::AIO                PACKAGE = IO::AIO

PROTOTYPES: ENABLE

BOOT:
{
        HV *stash = gv_stashpv ("IO::AIO", 1);
        newCONSTSUB (stash, "EXDEV",    newSViv (EXDEV));
        newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
        newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));

        create_pipe ();
        pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
}

void
min_parallel (nthreads)
        int     nthreads
        PROTOTYPE: $

void
max_parallel (nthreads)
        int     nthreads
        PROTOTYPE: $

int
max_outstanding (nreqs)
        int nreqs
        PROTOTYPE: $
        CODE:
        RETVAL = max_outstanding;
        max_outstanding = nreqs;

void
aio_open (pathname,flags,mode,callback=&PL_sv_undef)
        SV *    pathname
        int     flags
        int     mode
        SV *    callback
        PROTOTYPE: $$$;$
        PPCODE:
{
        dREQ;

        req->type = REQ_OPEN;
        req->data = newSVsv (pathname);
        req->dataptr = SvPVbyte_nolen (req->data);
        req->fd = flags;
        req->mode = mode;

        REQ_SEND;
}

void
aio_close (fh,callback=&PL_sv_undef)
        SV *    fh
        SV *    callback
        PROTOTYPE: $;$
        ALIAS:
           aio_close     = REQ_CLOSE
           aio_fsync     = REQ_FSYNC
           aio_fdatasync = REQ_FDATASYNC
        PPCODE:
{
        dREQ;

        req->type = ix;
        req->fh = newSVsv (fh);
        req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));

        REQ_SEND (req);
}

void
aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
        SV *    fh
        UV      offset
        UV      length
        SV *    data
        UV      dataoffset
        SV *    callback
        ALIAS:
           aio_read  = REQ_READ
           aio_write = REQ_WRITE
        PROTOTYPE: $$$$$;$
        PPCODE:
{
        aio_req req;
        STRLEN svlen;
        char *svptr = SvPVbyte (data, svlen);

        SvUPGRADE (data, SVt_PV);
        SvPOK_on (data);

        if (dataoffset < 0)
          dataoffset += svlen;

        if (dataoffset < 0 || dataoffset > svlen)
          croak ("data offset outside of string");

        if (ix == REQ_WRITE)
          {
            /* write: check length and adjust. */
            if (length < 0 || length + dataoffset > svlen)
              length = svlen - dataoffset;
          }
        else
          {
            /* read: grow scalar as necessary */
            svptr = SvGROW (data, length + dataoffset);
          }

        if (length < 0)
          croak ("length must not be negative");

        {
          dREQ;

          req->type = ix;
          req->fh = newSVsv (fh);
          req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
                                                  : IoOFP (sv_2io (fh)));
          req->offset = offset;
          req->length = length;
          req->data = SvREFCNT_inc (data);
          req->dataptr = (char *)svptr + dataoffset;

          if (!SvREADONLY (data))
            {
              SvREADONLY_on (data);
              req->data2ptr = (void *)data;
            }

          REQ_SEND;
        }
}

void
aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
        SV *    out_fh
        SV *    in_fh
        UV      in_offset
        UV      length
        SV *    callback
        PROTOTYPE: $$$$;$
        PPCODE:
{
        dREQ;

        req->type = REQ_SENDFILE;
        req->fh = newSVsv (out_fh);
        req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
        req->fh2 = newSVsv (in_fh);
        req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
        req->offset = in_offset;
        req->length = length;

        REQ_SEND;
}

void
aio_readahead (fh,offset,length,callback=&PL_sv_undef)
        SV *    fh
        UV      offset
        IV      length
        SV *    callback
        PROTOTYPE: $$$;$
        PPCODE:
{
        dREQ;

        req->type = REQ_READAHEAD;
        req->fh = newSVsv (fh);
        req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
        req->offset = offset;
        req->length = length;

        REQ_SEND;
}

void
aio_stat (fh_or_path,callback=&PL_sv_undef)
        SV *            fh_or_path
        SV *            callback
        ALIAS:
           aio_stat  = REQ_STAT
           aio_lstat = REQ_LSTAT
        PPCODE:
{
        dREQ;

        New (0, req->statdata, 1, Stat_t);
        if (!req->statdata)
          {
            req_free (req);
            croak ("out of memory during aio_req->statdata allocation");
          }

        if (SvPOK (fh_or_path))
          {
            req->type = ix;
            req->data = newSVsv (fh_or_path);
            req->dataptr = SvPVbyte_nolen (req->data);
          }
        else
          {
            req->type = REQ_FSTAT;
            req->fh = newSVsv (fh_or_path);
            req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        REQ_SEND;
}

void
aio_unlink (pathname,callback=&PL_sv_undef)
        SV * pathname
        SV * callback
        ALIAS:
           aio_unlink  = REQ_UNLINK
           aio_rmdir   = REQ_RMDIR
           aio_readdir = REQ_READDIR
        PPCODE:
{
        dREQ;
        
        req->type = ix;
        req->data = newSVsv (pathname);
        req->dataptr = SvPVbyte_nolen (req->data);
        
        REQ_SEND;
}

void
aio_link (oldpath,newpath,callback=&PL_sv_undef)
        SV * oldpath
        SV * newpath
        SV * callback
        ALIAS:
           aio_link    = REQ_LINK
           aio_symlink = REQ_SYMLINK
           aio_rename  = REQ_RENAME
        PPCODE:
{
        dREQ;
        
        req->type = ix;
        req->fh = newSVsv (oldpath);
        req->data2ptr = SvPVbyte_nolen (req->fh);
        req->data = newSVsv (newpath);
        req->dataptr = SvPVbyte_nolen (req->data);
        
        REQ_SEND;
}

void
aio_sleep (delay,callback=&PL_sv_undef)
        double delay
        SV * callback
        PPCODE:
{
        dREQ;

        req->type = REQ_SLEEP;
        req->fd  = delay < 0. ? 0 : delay;
        req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);

        REQ_SEND;
}

void
aio_group (callback=&PL_sv_undef)
        SV *    callback
        PROTOTYPE: ;$
        PPCODE:
{
        dREQ;

        req->type = REQ_GROUP;
        req_send (req);

        XPUSHs (req_sv (req, AIO_GRP_KLASS));
}

void
aio_nop (callback=&PL_sv_undef)
        SV * callback
        PPCODE:
{
        dREQ;

        req->type = REQ_NOP;

        REQ_SEND;
}

#if 0

void
aio_pri (int pri = DEFAULT_PRI)
        CODE:
        if (pri < PRI_MIN) pri = PRI_MIN;
        if (pri > PRI_MAX) pri = PRI_MAX;
        next_pri = pri + PRI_BIAS;

#endif

void
flush ()
        PROTOTYPE:
        CODE:
        while (nreqs)
          {
            poll_wait ();
            poll_cb ();
          }

void
poll()
        PROTOTYPE:
        CODE:
        if (nreqs)
          {
            poll_wait ();
            poll_cb ();
          }

int
poll_fileno()
        PROTOTYPE:
        CODE:
        RETVAL = respipe [0];
        OUTPUT:
        RETVAL

int
poll_cb(...)
        PROTOTYPE:
        CODE:
        RETVAL = poll_cb ();
        OUTPUT:
        RETVAL

void
poll_wait()
        PROTOTYPE:
        CODE:
        if (nreqs)
          poll_wait ();

int
nreqs()
        PROTOTYPE:
        CODE:
        RETVAL = nreqs;
        OUTPUT:
        RETVAL

PROTOTYPES: DISABLE

MODULE = IO::AIO                PACKAGE = IO::AIO::REQ

void
cancel (aio_req_ornot req)
        PROTOTYPE:
        CODE:
        req_cancel (req);

void
cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
        CODE:
        SvREFCNT_dec (req->callback);
        req->callback = newSVsv (callback);

MODULE = IO::AIO                PACKAGE = IO::AIO::GRP

void
add (aio_req grp, ...)
        PPCODE:
{
        int i;
        aio_req req;

        if (grp->fd == 2)
          croak ("cannot add requests to IO::AIO::GRP after the group finished");

        for (i = 1; i < items; ++i )
          {
            if (GIMME_V != G_VOID)
              XPUSHs (sv_2mortal (newSVsv (ST (i))));

            req = SvAIO_REQ (ST (i));

            if (req)
              {
                ++grp->length;
                req->grp = grp;

                req->grp_prev = 0;
                req->grp_next = grp->grp_first;

                if (grp->grp_first)
                  grp->grp_first->grp_prev = req;

                grp->grp_first = req;
              }
          }
}

void
result (aio_req grp, ...)
        CODE:
{
        int i;
        AV *av = newAV ();

        for (i = 1; i < items; ++i )
          av_push (av, newSVsv (ST (i)));

        SvREFCNT_dec (grp->data);
        grp->data = (SV *)av;
}

void
feed_limit (aio_req grp, int limit)
        CODE:
        grp->fd2 = limit;
        aio_grp_feed (grp);

void
feed (aio_req grp, SV *callback=&PL_sv_undef)
        CODE:
{
        SvREFCNT_dec (grp->fh2);
        grp->fh2 = newSVsv (callback);

        if (grp->fd2 <= 0)
          grp->fd2 = 2;

        aio_grp_feed (grp);
}

Revision:	1.63
Committed:	Mon Oct 23 23:48:31 2006 UTC (17 years, 6 months ago) by root
Branch:	MAIN
Changes since 1.62:	+13 -2 lines
Log Message:	* empty log message *